Android Image Slideshow using ViewPager

Screen slides are transitions between one entire screen to another and are common with UIs like setup wizards or slideshows. This Android tutorial shows how to create image slideshow with ViewPager (provided as part of Android support library). ViewPager can animate screen slides automatically.

Here’s what a screen slide looks like – transition from one screen to the next:

Project Description:

In this Android Image Slideshow tutorial we will be doing the following,

Create an image slideshow along with image description using ViewPager and display circle indicator to show the current position in the slideshow.
Enclose ViewPager and circle indicator in a layout and provide a border.
Retrieve and parse JSON (product information) from remote server and store it as list of products.
Handle ViewPager item clicks to display product details in another fragment (ProductDetailFragment)
Proper back navigation of fragments on back key pressed.
Handle fragment orientation changes and retain the state of the fragment.

We will also be using the following library projects,

Universal Image Loader for Android for asynchronous image loading.
ViewPagerIndicator library to bring circle indicator with ViewPager.

Prerequisites

Place the Universal Image Loader JAR file in your libs folder and add it to project’s “Build Path”.

Create JSON File

Create a new JSON file and name it as products.json and copy-paste the following content. Place this file in a remote server, for example Apache server’s “www” folder or /webapps/ROOT folder.

{
    "status": true,
    "data": {
        "products": [
            {
                "id": "434",
                "name": "Pattern - Fractal Wallpaper",
                "image_url": "http://images5.alphacoders.com/350/350374.jpg"
            },
            {
                "id": "431",
                "name": "Mickey Mouse",
                "image_url": "http://www.iconsdb.com/icons/download/icon-sets/sketchy-pink/mickey-mouse-20-512.png"
			},
            {
                "id": "424",
                "name": "Pattern - Wallpaper",
                "image_url": "http://images7.alphacoders.com/421/421423.jpg"
            },
			 {
                "id": "426",
                "name": "Batman",
                "image_url": "http://www.iconsdb.com/icons/download/icon-sets/sketchy-pink/batman-6-512.png"
            },
            {
                "id": "419",
                "name": "Pattern - Music",
                "image_url": "http://images3.alphacoders.com/169/169085.jpg"
            }
        ]
    }
}

{

"status": true,

"data": {

"products": [

{

"id": "434",

"name": "Pattern - Fractal Wallpaper",

"image_url": "http://images5.alphacoders.com/350/350374.jpg"

{

"id": "431",

"name": "Mickey Mouse",

"image_url": "http://www.iconsdb.com/icons/download/icon-sets/sketchy-pink/mickey-mouse-20-512.png"

{

"id": "424",

"name": "Pattern - Wallpaper",

"image_url": "http://images7.alphacoders.com/421/421423.jpg"

{

"id": "426",

"name": "Batman",

"image_url": "http://www.iconsdb.com/icons/download/icon-sets/sketchy-pink/batman-6-512.png"

{

"id": "419",

"name": "Pattern - Music",

"image_url": "http://images3.alphacoders.com/169/169085.jpg"

}

]

}

Android Project

Create a new Android project and name it as AndroidImageSlideShow.

Download “Android Image Slideshow using ViewPager” ImageViewSlideshow.zip – Downloaded 23359 times – 2 MB

Resources

colors.xml

Create a new file res/values/colors.xml and copy paste the following content.

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <color name="holo_blue_dark">#ff0099cc</color>
    <color name="view_divider_color">#BABABA</color>
    <color name="view_divider_color_2">#DADADA</color>

</resources>

<?xml version="1.0" encoding="utf-8"?>

<color name="view_divider_color">#BABABA</color>

<color name="view_divider_color_2">#DADADA</color>

</resources>

strings.xml

Open res/values/strings.xml and edit to have the content as shown below.

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">AndroidImageSlideShow</string>
    <string name="action_settings">Settings</string>
    <string name="product_name">Product Name</string>
    <string name="txt_image_slider">Image Slideshow</string>
    <string name="no_internet_connection">No Internet Connection</string>
    <string name="time_out">Time Out</string>
    <string name="error_occured">Error Occurred</string>

</resources>

<?xml version="1.0" encoding="utf-8"?>

<string name="app_name">AndroidImageSlideShow</string>

<string name="action_settings">Settings</string>

<string name="product_name">Product Name</string>

<string name="txt_image_slider">Image Slideshow</string>

<string name="no_internet_connection">No Internet Connection</string>

<string name="error_occured">Error Occurred</string>

</resources>

indicator_tags.xml

Create a new file res/values/indicator_tags.xml and copy the following content. The attributes defined here are used by circle page indicator. You can use this file to change the circle indicator fill color, stroke color, stroke width, circle radius and any other related styles.

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <bool name="default_circle_indicator_centered">true</bool>

    <color name="default_circle_indicator_fill_color">#FFFF0000</color>
    <color name="default_circle_indicator_page_color">#00000000</color>

    <integer name="default_circle_indicator_orientation">0</integer>

    <dimen name="default_circle_indicator_radius">4dp</dimen>

    <bool name="default_circle_indicator_snap">false</bool>

    <color name="default_circle_indicator_stroke_color">#FFDDDDDD</color>

    <dimen name="default_circle_indicator_stroke_width">1dp</dimen>

    <declare-styleable name="ViewPagerIndicator">

        <!-- Style of the circle indicator. -->
        <attr name="vpiCirclePageIndicatorStyle" format="reference" />
        <!-- Style of the icon indicator's views. -->
        <attr name="vpiIconPageIndicatorStyle" format="reference" />
        <!-- Style of the line indicator. -->
        <attr name="vpiLinePageIndicatorStyle" format="reference" />
        <!-- Style of the title indicator. -->
        <attr name="vpiTitlePageIndicatorStyle" format="reference" />
        <!-- Style of the tab indicator's tabs. -->
        <attr name="vpiTabPageIndicatorStyle" format="reference" />
        <!-- Style of the underline indicator. -->
        <attr name="vpiUnderlinePageIndicatorStyle" format="reference" />
    </declare-styleable>

    <attr name="centered" format="boolean" />
    <attr name="selectedColor" format="color" />
    <attr name="strokeWidth" format="dimension" />
    <attr name="unselectedColor" format="color" />

    <declare-styleable name="CirclePageIndicator">

        <!-- Whether or not the indicators should be centered. -->
        <attr name="centered" />
        <!-- Color of the filled circle that represents the current page. -->
        <attr name="fillColor" format="color" />
        <!-- Color of the filled circles that represents pages. -->
        <attr name="pageColor" format="color" />
        <!-- Orientation of the indicator. -->
        <attr name="android:orientation" />
        <!-- Radius of the circles. This is also the spacing between circles. -->
        <attr name="radius" format="dimension" />
        <!-- Whether or not the selected indicator snaps to the circles. -->
        <attr name="snap" format="boolean" />
        <!-- Color of the open circles. -->
        <attr name="strokeColor" format="color" />
        <!-- Width of the stroke used to draw the circles. -->
        <attr name="strokeWidth" />
        <!-- View background -->
        <attr name="android:background" />
    </declare-styleable>
    <declare-styleable name="LinePageIndicator">

        <!-- Whether or not the indicators should be centered. -->
        <attr name="centered" />
        <!-- Color of the unselected lines that represent the pages. -->
        <attr name="unselectedColor" />
        <!-- Color of the selected line that represents the current page. -->
        <attr name="selectedColor" />
        <!-- Width of each indicator line. -->
        <attr name="lineWidth" format="dimension" />
        <!-- Width of each indicator line's stroke. -->
        <attr name="strokeWidth" />
        <!-- Width of the gap between each indicator line. -->
        <attr name="gapWidth" format="dimension" />
        <!-- View background -->
        <attr name="android:background" />
    </declare-styleable>
    <declare-styleable name="TitlePageIndicator">

        <!-- Screen edge padding. -->
        <attr name="clipPadding" format="dimension" />
        <!-- Color of the footer line and indicator. -->
        <attr name="footerColor" format="color" />
        <!-- Height of the footer line. -->
        <attr name="footerLineHeight" format="dimension" />
        <!-- Style of the indicator. Default is triangle. -->
        <attr name="footerIndicatorStyle">
            <enum name="none" value="0" />
            <enum name="triangle" value="1" />
            <enum name="underline" value="2" />
        </attr>
        <!-- Height of the indicator above the footer line. -->
        <attr name="footerIndicatorHeight" format="dimension" />
        <!-- Left and right padding of the underline indicator. -->
        <attr name="footerIndicatorUnderlinePadding" format="dimension" />
        <!-- Padding between the bottom of the title and the footer. -->
        <attr name="footerPadding" format="dimension" />
        <!-- Position of the line. -->
        <attr name="linePosition">
            <enum name="bottom" value="0" />
            <enum name="top" value="1" />
        </attr>
        <!-- Color of the selected title. -->
        <attr name="selectedColor" />
        <!-- Whether or not the selected item is displayed as bold. -->
        <attr name="selectedBold" format="boolean" />
        <!-- Color of regular titles. -->
        <attr name="android:textColor" />
        <!-- Size of title text. -->
        <attr name="android:textSize" />
        <!-- Padding between titles when bumping into each other. -->
        <attr name="titlePadding" format="dimension" />
        <!-- Padding between titles and the top of the View. -->
        <attr name="topPadding" format="dimension" />
        <!-- View background -->
        <attr name="android:background" />
    </declare-styleable>
    <declare-styleable name="UnderlinePageIndicator">

        <!-- Whether or not the selected indicator fades. -->
        <attr name="fades" format="boolean" />
        <!-- Length of the delay to fade the indicator. -->
        <attr name="fadeDelay" format="integer" />
        <!-- Length of the indicator fade to transparent. -->
        <attr name="fadeLength" format="integer" />
        <!-- Color of the selected line that represents the current page. -->
        <attr name="selectedColor" />
        <!-- View background -->
        <attr name="android:background" />
    </declare-styleable>

</resources>

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<?xml version="1.0" encoding="utf-8"?>

<bool name="default_circle_indicator_snap">false</bool>

<color name="default_circle_indicator_stroke_color">#FFDDDDDD</color>

<declare-styleable name="ViewPagerIndicator">

</declare-styleable>

<declare-styleable name="CirclePageIndicator">

</declare-styleable>

<declare-styleable name="LinePageIndicator">

</declare-styleable>

<declare-styleable name="TitlePageIndicator">

</attr>

</attr>

</declare-styleable>

<declare-styleable name="UnderlinePageIndicator">

</declare-styleable>

</resources>

img_border.xml

Create a new file res/drawable/img_border.xml and copy the following content. This brings a border to ViewPager and circle page indicator layout.

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:dither="true"
    android:shape="rectangle" >

    <solid android:color="#FFFFFF" />

    <stroke
        android:width="1dp"
        android:color="#AAAAAA" />

    <padding
        android:bottom="1dp"
        android:left="1dp"
        android:right="1dp"
        android:top="1dp" />

</shape>

<?xml version="1.0" encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android"

android:dither="true"

android:shape="rectangle" >

<stroke

android:width="1dp"

android:color="#AAAAAA" />

<padding

android:bottom="1dp"

android:left="1dp"

android:right="1dp"

android:top="1dp" />

</shape>

Layout files

activity_main.xml

This is the main layout file which uses a Framelayout to hold fragments. Open res/layout/activity_main.xml and edit to have the content as shown below.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <FrameLayout
        android:id="@+id/content_frame"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity" >

<FrameLayout

android:id="@+id/content_frame"

android:layout_width="match_parent"

android:layout_height="match_parent" />

</RelativeLayout>

fragment_home.xml

This layout file is used by HomeFragment to display image slide show using ViewPager. Here it encloses ViewPager and circle page indicator in a single layout by displaying circle page indicator over ViewPager.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    tools:context=".MainActivity" >

    <RelativeLayout
        android:id="@+id/img_slide_header_layout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/txt_image_slider"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:padding="4dp"
            android:paddingLeft="20dp"
            android:text="@string/txt_image_slider"
            android:textColor="@color/holo_blue_dark"
            android:textSize="16sp"
            android:textStyle="bold" />

        <View
            android:id="@+id/div1"
            android:layout_width="fill_parent"
            android:layout_height="2dp"
            android:layout_below="@+id/txt_image_slider"
            android:layout_marginBottom="7dp"
            android:layout_marginTop="4dp"
            android:background="@color/holo_blue_dark" />
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/img_slideshow_layout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/img_slide_header_layout"
        android:layout_marginTop="10dp"
        android:background="@drawable/img_border" >

        <android.support.v4.view.ViewPager
            android:id="@+id/view_pager"
            android:layout_width="fill_parent"
            android:layout_height="150dp" />

        <TextView
            android:id="@+id/img_name"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/indicator"
            android:background="#88343434"
            android:ellipsize="end"
            android:paddingBottom="2dp"
            android:paddingLeft="5dp"
            android:paddingRight="2dp"
            android:paddingTop="2dp"
            android:singleLine="true"
            android:textColor="#ededed" />

        <com.androidopentutorials.imageslideshow.utils.CirclePageIndicator
            android:id="@+id/indicator"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/view_pager"
            android:padding="10dip" />
    </RelativeLayout>

    <View
        android:id="@+id/div_a"
        android:layout_width="wrap_content"
        android:layout_height="1dp"
        android:layout_below="@+id/img_slideshow_layout"
        android:background="@color/view_divider_color" />

    <View
        android:id="@+id/div_b"
        android:layout_width="wrap_content"
        android:layout_height="1dp"
        android:layout_below="@+id/div_a"
        android:background="@color/sliding_list_divider_color" />

</RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:padding="10dp"

tools:context=".MainActivity" >

<RelativeLayout

android:id="@+id/img_slide_header_layout"

android:layout_width="fill_parent"

android:layout_height="wrap_content" >

<TextView

android:id="@+id/txt_image_slider"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:padding="4dp"

android:paddingLeft="20dp"

android:text="@string/txt_image_slider"

android:textColor="@color/holo_blue_dark"

android:textSize="16sp"

android:textStyle="bold" />

<View

android:id="@+id/div1"

android:layout_width="fill_parent"

android:layout_height="2dp"

android:layout_below="@+id/txt_image_slider"

android:layout_marginBottom="7dp"

android:layout_marginTop="4dp"

android:background="@color/holo_blue_dark" />

</RelativeLayout>

<RelativeLayout

android:id="@+id/img_slideshow_layout"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_below="@+id/img_slide_header_layout"

android:layout_marginTop="10dp"

android:background="@drawable/img_border" >

<android.support.v4.view.ViewPager

android:id="@+id/view_pager"

android:layout_width="fill_parent"

android:layout_height="150dp" />

<TextView

android:id="@+id/img_name"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_below="@+id/indicator"

android:background="#88343434"

android:ellipsize="end"

android:paddingBottom="2dp"

android:paddingLeft="5dp"

android:paddingRight="2dp"

android:paddingTop="2dp"

android:singleLine="true"

android:textColor="#ededed" />

<com.androidopentutorials.imageslideshow.utils.CirclePageIndicator

android:id="@+id/indicator"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_below="@+id/view_pager"

android:padding="10dip" />

</RelativeLayout>

<View

android:id="@+id/div_a"

android:layout_width="wrap_content"

android:layout_height="1dp"

android:layout_below="@+id/img_slideshow_layout"

android:background="@color/view_divider_color" />

<View

android:id="@+id/div_b"

android:layout_width="wrap_content"

android:layout_height="1dp"

android:layout_below="@+id/div_a"

android:background="@color/sliding_list_divider_color" />

</RelativeLayout>

vp_image.xml

This layout file is for the content of a fragment to be used by ViewPager. The file contains an image view.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="10dp" >

    <ImageView
        android:id="@+id/image_display"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:contentDescription="@string/txt_image_slider" />

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:padding="10dp" >

<ImageView

android:id="@+id/image_display"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:contentDescription="@string/txt_image_slider" />

</RelativeLayout>

fragmet_pdt_detail.xml

This layout file is used by ProductDetailFragment to display product details when a page (fragment) in ViewPager is clicked.

<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/pdt_detail_root_layout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FFFFFF" >

    <RelativeLayout
        android:id="@+id/header_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="5dp" >

        <RelativeLayout
            android:id="@+id/header_title_layout"
            android:layout_width="90dp"
            android:layout_height="wrap_content" >

            <ImageView
                android:id="@+id/product_detail_img"
                android:layout_width="match_parent"
                android:layout_height="100dp"
                android:contentDescription="@string/app_name"
                android:scaleType="fitCenter"
                android:src="@drawable/ic_launcher" />
        </RelativeLayout>

        <TextView
            android:id="@+id/product_id_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:paddingTop="10dp"
            android:layout_toRightOf="@+id/header_title_layout"
            android:textSize="15sp"
            android:textStyle="bold" />
    </RelativeLayout>

    <View
        android:id="@+id/div_line1"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_below="@+id/header_layout"
        android:background="@color/view_divider_color" />

    <View
        android:id="@+id/div_line2"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_below="@+id/div_line1"
        android:background="@color/sliding_list_divider_color" />

    <ScrollView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_below="@+id/div_line1"
        android:background="#EDEDED"
        android:padding="10dp"
        android:scrollbarStyle="outsideOverlay" >

        <LinearLayout
            android:id="@+id/rlayout_detail"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

            <RelativeLayout
                android:id="@+id/pdt_name_layout"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                android:background="@android:color/white"
                android:paddingBottom="10dp" >

                <TextView
                    android:id="@+id/pdt_name_title"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:paddingBottom="4dp"
                    android:paddingLeft="12dp"
                    android:paddingRight="4dp"
                    android:paddingTop="4dp"
                    android:text="@string/product_name"
                    android:textColor="@color/holo_blue_dark"
                    android:textSize="15sp"
                    android:textStyle="bold" />

                <View
                    android:id="@+id/div_a"
                    android:layout_width="wrap_content"
                    android:layout_height="2dp"
                    android:layout_below="@+id/pdt_name_title"
                    android:layout_marginLeft="10dp"
                    android:layout_marginRight="10dp"
                    android:background="@color/view_divider_color" />

                <TextView
                    android:id="@+id/pdt_name"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignLeft="@+id/div_a"
                    android:layout_below="@+id/div_a"
                    android:layout_marginLeft="5dp"
                    android:layout_marginTop="7dp" />
            </RelativeLayout>
        </LinearLayout>
    </ScrollView>

    <!-- <ProgressBar
        android:id="@+id/progressBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:visibility="gone" /> -->

</RelativeLayout>

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<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/pdt_detail_root_layout"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="#FFFFFF" >

<RelativeLayout

android:id="@+id/header_layout"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:padding="5dp" >

<RelativeLayout

android:id="@+id/header_title_layout"

android:layout_width="90dp"

android:layout_height="wrap_content" >

<ImageView

android:id="@+id/product_detail_img"

android:layout_width="match_parent"

android:layout_height="100dp"

android:contentDescription="@string/app_name"

android:scaleType="fitCenter"

android:src="@drawable/ic_launcher" />

</RelativeLayout>

<TextView

android:id="@+id/product_id_text"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_marginLeft="10dp"

android:layout_marginTop="10dp"

android:paddingTop="10dp"

android:layout_toRightOf="@+id/header_title_layout"

android:textSize="15sp"

android:textStyle="bold" />

</RelativeLayout>

<View

android:id="@+id/div_line1"

android:layout_width="match_parent"

android:layout_height="1dp"

android:layout_below="@+id/header_layout"

android:background="@color/view_divider_color" />

<View

android:id="@+id/div_line2"

android:layout_width="match_parent"

android:layout_height="1dp"

android:layout_below="@+id/div_line1"

android:background="@color/sliding_list_divider_color" />

<ScrollView

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:layout_below="@+id/div_line1"

android:background="#EDEDED"

android:padding="10dp"

android:scrollbarStyle="outsideOverlay" >

<LinearLayout

android:id="@+id/rlayout_detail"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="vertical" >

<RelativeLayout

android:id="@+id/pdt_name_layout"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_marginTop="10dp"

android:background="@android:color/white"

android:paddingBottom="10dp" >

<TextView

android:id="@+id/pdt_name_title"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:paddingBottom="4dp"

android:paddingLeft="12dp"

android:paddingRight="4dp"

android:paddingTop="4dp"

android:text="@string/product_name"

android:textColor="@color/holo_blue_dark"

android:textSize="15sp"

android:textStyle="bold" />

<View

android:id="@+id/div_a"

android:layout_width="wrap_content"

android:layout_height="2dp"

android:layout_below="@+id/pdt_name_title"

android:layout_marginLeft="10dp"

android:layout_marginRight="10dp"

android:background="@color/view_divider_color" />

<TextView

android:id="@+id/pdt_name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignLeft="@+id/div_a"

android:layout_below="@+id/div_a"

android:layout_marginLeft="5dp"

android:layout_marginTop="7dp" />

</RelativeLayout>

</LinearLayout>

</ScrollView>

<!-- <ProgressBar

android:id="@+id/progressBar"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerInParent="true"

android:visibility="gone" /> -->

</RelativeLayout>

Sources

TagName

In src folder, create a new class TagName in the package com.androidopentutorials.imageslideshow.utils. This class defines tag and key names defined in JSON.

package com.androidopentutorials.imageslideshow.utils;

public class TagName {
	
	public static final String TAG_STATUS = "status";
	public static final String TAG_DATA = "data";
	public static final String TAG_PRODUCTS = "products";
	public static final String KEY_NAME = "name";
	public static final String KEY_IMAGE_URL = "image_url";	
	public static final String KEY_ID = "id";
}

package com.androidopentutorials.imageslideshow.utils;

public class TagName {

public static final String TAG_STATUS = "status";

public static final String TAG_DATA = "data";

public static final String TAG_PRODUCTS = "products";

public static final String KEY_NAME = "name";

public static final String KEY_IMAGE_URL = "image_url";

public static final String KEY_ID = "id";

}

CheckNetworkConnection

In src folder, create a new class CheckNetworkConnection in the package com.androidopentutorials.imageslideshow.utils.

Before our app attempts to connect to the network, it should check to see whether a network connection is available using getActiveNetworkInfo() and isConnected(). Remember, the device may be out of range of a network, or the user may have disabled both Wi-Fi and mobile data access.

We use this class to check whether the device has internet connection before sending request to receive remote JSON.

package com.androidopentutorials.imageslideshow.utils;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class CheckNetworkConnection {

	public static boolean isConnectionAvailable(Context context) {

		ConnectivityManager connectivityManager = (ConnectivityManager) context
				.getSystemService(Context.CONNECTIVITY_SERVICE);
		if (connectivityManager != null) {
			NetworkInfo netInfo = connectivityManager.getActiveNetworkInfo();
			if (netInfo != null && netInfo.isConnected()
					&& netInfo.isConnectedOrConnecting()
					&& netInfo.isAvailable()) {
				return true;
			}
		}
		return false;
	}
}

package com.androidopentutorials.imageslideshow.utils;

import android.content.Context;

import android.net.ConnectivityManager;

import android.net.NetworkInfo;

public class CheckNetworkConnection {

public static boolean isConnectionAvailable(Context context) {

ConnectivityManager connectivityManager = (ConnectivityManager) context

.getSystemService(Context.CONNECTIVITY_SERVICE);

if (connectivityManager != null) {

NetworkInfo netInfo = connectivityManager.getActiveNetworkInfo();

if (netInfo != null && netInfo.isConnected()

&& netInfo.isConnectedOrConnecting()

&& netInfo.isAvailable()) {

return true;

}

return false;

}

PageIndicator

In src folder, create a new interface PageIndicator in the package com.androidopentutorials.imageslideshow.utils. This is a class from Android ViewPagerIndicator library which is used to draw a circle indicator over the ViewPager. This interface is responsible for showing an visual indicator indicating the currently visible view.

/*
 * Copyright (C) 2011 Patrik Akerfeldt
 * Copyright (C) 2011 Jake Wharton
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.androidopentutorials.imageslideshow.utils;

import android.support.v4.view.ViewPager;

/**
 * A PageIndicator is responsible to show an visual indicator on the total views
 * number and the current visible view.
 */
public interface PageIndicator extends ViewPager.OnPageChangeListener {
    /**
     * Bind the indicator to a ViewPager.
     *
     * @param view
     */
    void setViewPager(ViewPager view);

    /**
     * Bind the indicator to a ViewPager.
     *
     * @param view
     * @param initialPosition
     */
    void setViewPager(ViewPager view, int initialPosition);

    /**
     * <p>Set the current page of both the ViewPager and indicator.</p>
     *
     * <p>This <strong>must</strong> be used if you need to set the page before
     * the views are drawn on screen (e.g., default start page).</p>
     *
     * @param item
     */
    void setCurrentItem(int item);

    /**
     * Set a page change listener which will receive forwarded events.
     *
     * @param listener
     */
    void setOnPageChangeListener(ViewPager.OnPageChangeListener listener);

    /**
     * Notify the indicator that the fragment list has changed.
     */
    void notifyDataSetChanged();
}

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

package com.androidopentutorials.imageslideshow.utils;

import android.support.v4.view.ViewPager;

/**

* A PageIndicator is responsible to show an visual indicator on the total views

* number and the current visible view.

public interface PageIndicator extends ViewPager.OnPageChangeListener {

/**

* Bind the indicator to a ViewPager.

* @param view

void setViewPager(ViewPager view);

/**

* Bind the indicator to a ViewPager.

* @param view

* @param initialPosition

void setViewPager(ViewPager view, int initialPosition);

/**

* Set the current page of both the ViewPager and indicator.

* This must be used if you need to set the page before

* the views are drawn on screen (e.g., default start page).

* @param item

void setCurrentItem(int item);

/**

* Set a page change listener which will receive forwarded events.

* @param listener

void setOnPageChangeListener(ViewPager.OnPageChangeListener listener);

/**

* Notify the indicator that the fragment list has changed.

void notifyDataSetChanged();

}

CirclePageIndicator

In src folder, create a new class CirclePageIndicator in the package com.androidopentutorials.imageslideshow.utils. This is also a class from Android ViewPagerIndicator library which implements the above interface.

/*
 * Copyright (C) 2011 Patrik Akerfeldt
 * Copyright (C) 2011 Jake Wharton
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.androidopentutorials.imageslideshow.utils;

import static android.graphics.Paint.ANTI_ALIAS_FLAG;
import static android.widget.LinearLayout.HORIZONTAL;
import static android.widget.LinearLayout.VERTICAL;
import android.content.Context;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.drawable.Drawable;
import android.os.Parcel;
import android.os.Parcelable;
import android.support.v4.view.MotionEventCompat;
import android.support.v4.view.ViewConfigurationCompat;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;

import com.androidopentutorials.imageslideshow.R;

/**
 * Draws circles (one for each view). The current view position is filled and
 * others are only stroked.
 */
public class CirclePageIndicator extends View implements PageIndicator {
    private static final int INVALID_POINTER = -1;

    private float mRadius;
    private final Paint mPaintPageFill = new Paint(ANTI_ALIAS_FLAG);
    private final Paint mPaintStroke = new Paint(ANTI_ALIAS_FLAG);
    private final Paint mPaintFill = new Paint(ANTI_ALIAS_FLAG);
    private ViewPager mViewPager;
    private ViewPager.OnPageChangeListener mListener;
    private int mCurrentPage;
    private int mSnapPage;
    private float mPageOffset;
    private int mScrollState;
    private int mOrientation;
    private boolean mCentered;
    private boolean mSnap;

    private int mTouchSlop;
    private float mLastMotionX = -1;
    private int mActivePointerId = INVALID_POINTER;
    private boolean mIsDragging;


    public CirclePageIndicator(Context context) {
        this(context, null);
    }

    public CirclePageIndicator(Context context, AttributeSet attrs) {
        this(context, attrs, R.attr.vpiCirclePageIndicatorStyle);
    }

    public CirclePageIndicator(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        if (isInEditMode()) return;

        //Load defaults from resources
        final Resources res = getResources();
        final int defaultPageColor = res.getColor(R.color.default_circle_indicator_page_color);
        //default_circle_indicator_fill_color
        final int defaultFillColor = res.getColor(R.color.holo_blue_dark);
        final int defaultOrientation = res.getInteger(R.integer.default_circle_indicator_orientation);
        final int defaultStrokeColor = res.getColor(R.color.default_circle_indicator_stroke_color);
        final float defaultStrokeWidth = res.getDimension(R.dimen.default_circle_indicator_stroke_width);
        final float defaultRadius = res.getDimension(R.dimen.default_circle_indicator_radius);
        final boolean defaultCentered = res.getBoolean(R.bool.default_circle_indicator_centered);
        final boolean defaultSnap = res.getBoolean(R.bool.default_circle_indicator_snap);

        //Retrieve styles attributes
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CirclePageIndicator, defStyle, 0);

        mCentered = a.getBoolean(R.styleable.CirclePageIndicator_centered, defaultCentered);
        mOrientation = a.getInt(R.styleable.CirclePageIndicator_android_orientation, defaultOrientation);
        mPaintPageFill.setStyle(Style.FILL);
        mPaintPageFill.setColor(a.getColor(R.styleable.CirclePageIndicator_pageColor, defaultPageColor));
        mPaintStroke.setStyle(Style.STROKE);
        mPaintStroke.setColor(a.getColor(R.styleable.CirclePageIndicator_strokeColor, defaultStrokeColor));
        mPaintStroke.setStrokeWidth(a.getDimension(R.styleable.CirclePageIndicator_strokeWidth, defaultStrokeWidth));
        mPaintFill.setStyle(Style.FILL);
        mPaintFill.setColor(a.getColor(R.styleable.CirclePageIndicator_fillColor, defaultFillColor));
        mRadius = a.getDimension(R.styleable.CirclePageIndicator_radius, defaultRadius);
        mSnap = a.getBoolean(R.styleable.CirclePageIndicator_snap, defaultSnap);

        Drawable background = a.getDrawable(R.styleable.CirclePageIndicator_android_background);
        if (background != null) {
          setBackgroundDrawable(background);
        }

        a.recycle();

        final ViewConfiguration configuration = ViewConfiguration.get(context);
        mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
    }


    public void setCentered(boolean centered) {
        mCentered = centered;
        invalidate();
    }

    public boolean isCentered() {
        return mCentered;
    }

    public void setPageColor(int pageColor) {
        mPaintPageFill.setColor(pageColor);
        invalidate();
    }

    public int getPageColor() {
        return mPaintPageFill.getColor();
    }

    public void setFillColor(int fillColor) {
        mPaintFill.setColor(fillColor);
        invalidate();
    }

    public int getFillColor() {
        return mPaintFill.getColor();
    }

    public void setOrientation(int orientation) {
        switch (orientation) {
            case HORIZONTAL:
            case VERTICAL:
                mOrientation = orientation;
                requestLayout();
                break;

            default:
                throw new IllegalArgumentException("Orientation must be either HORIZONTAL or VERTICAL.");
        }
    }

    public int getOrientation() {
        return mOrientation;
    }

    public void setStrokeColor(int strokeColor) {
        mPaintStroke.setColor(strokeColor);
        invalidate();
    }

    public int getStrokeColor() {
        return mPaintStroke.getColor();
    }

    public void setStrokeWidth(float strokeWidth) {
        mPaintStroke.setStrokeWidth(strokeWidth);
        invalidate();
    }

    public float getStrokeWidth() {
        return mPaintStroke.getStrokeWidth();
    }

    public void setRadius(float radius) {
        mRadius = radius;
        invalidate();
    }

    public float getRadius() {
        return mRadius;
    }

    public void setSnap(boolean snap) {
        mSnap = snap;
        invalidate();
    }

    public boolean isSnap() {
        return mSnap;
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        if (mViewPager == null) {
            return;
        }
        final int count = mViewPager.getAdapter().getCount();
        if (count == 0) {
            return;
        }

        if (mCurrentPage >= count) {
            setCurrentItem(count - 1);
            return;
        }

        int longSize;
        int longPaddingBefore;
        int longPaddingAfter;
        int shortPaddingBefore;
        if (mOrientation == HORIZONTAL) {
            longSize = getWidth();
            longPaddingBefore = getPaddingLeft();
            longPaddingAfter = getPaddingRight();
            shortPaddingBefore = getPaddingTop();
        } else {
            longSize = getHeight();
            longPaddingBefore = getPaddingTop();
            longPaddingAfter = getPaddingBottom();
            shortPaddingBefore = getPaddingLeft();
        }

        final float threeRadius = mRadius * 3;
        final float shortOffset = shortPaddingBefore + mRadius;
        float longOffset = longPaddingBefore + mRadius;
        if (mCentered) {
            longOffset += ((longSize - longPaddingBefore - longPaddingAfter) / 2.0f) - ((count * threeRadius) / 2.0f);
        }

        float dX;
        float dY;

        float pageFillRadius = mRadius;
        if (mPaintStroke.getStrokeWidth() > 0) {
            pageFillRadius -= mPaintStroke.getStrokeWidth() / 2.0f;
        }

        //Draw stroked circles
        for (int iLoop = 0; iLoop < count; iLoop++) {
            float drawLong = longOffset + (iLoop * threeRadius);
            if (mOrientation == HORIZONTAL) {
                dX = drawLong;
                dY = shortOffset;
            } else {
                dX = shortOffset;
                dY = drawLong;
            }
            // Only paint fill if not completely transparent
            if (mPaintPageFill.getAlpha() > 0) {
                canvas.drawCircle(dX, dY, pageFillRadius, mPaintPageFill);
            }

            // Only paint stroke if a stroke width was non-zero
            if (pageFillRadius != mRadius) {
                canvas.drawCircle(dX, dY, mRadius, mPaintStroke);
            }
        }

        //Draw the filled circle according to the current scroll
        float cx = (mSnap ? mSnapPage : mCurrentPage) * threeRadius;
        if (!mSnap) {
            cx += mPageOffset * threeRadius;
        }
        if (mOrientation == HORIZONTAL) {
            dX = longOffset + cx;
            dY = shortOffset;
        } else {
            dX = shortOffset;
            dY = longOffset + cx;
        }
        canvas.drawCircle(dX, dY, mRadius, mPaintFill);
    }

    public boolean onTouchEvent(android.view.MotionEvent ev) {
        if (super.onTouchEvent(ev)) {
            return true;
        }
        if ((mViewPager == null) || (mViewPager.getAdapter().getCount() == 0)) {
            return false;
        }

        final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
                mLastMotionX = ev.getX();
                break;

            case MotionEvent.ACTION_MOVE: {
                final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
                final float x = MotionEventCompat.getX(ev, activePointerIndex);
                final float deltaX = x - mLastMotionX;

                if (!mIsDragging) {
                    if (Math.abs(deltaX) > mTouchSlop) {
                        mIsDragging = true;
                    }
                }

                if (mIsDragging) {
                    mLastMotionX = x;
                    if (mViewPager.isFakeDragging() || mViewPager.beginFakeDrag()) {
                        mViewPager.fakeDragBy(deltaX);
                    }
                }

                break;
            }

            case MotionEvent.ACTION_CANCEL:
            case MotionEvent.ACTION_UP:
                if (!mIsDragging) {
                    final int count = mViewPager.getAdapter().getCount();
                    final int width = getWidth();
                    final float halfWidth = width / 2f;
                    final float sixthWidth = width / 6f;

                    if ((mCurrentPage > 0) && (ev.getX() < halfWidth - sixthWidth)) {
                        if (action != MotionEvent.ACTION_CANCEL) {
                            mViewPager.setCurrentItem(mCurrentPage - 1);
                        }
                        return true;
                    } else if ((mCurrentPage < count - 1) && (ev.getX() > halfWidth + sixthWidth)) {
                        if (action != MotionEvent.ACTION_CANCEL) {
                            mViewPager.setCurrentItem(mCurrentPage + 1);
                        }
                        return true;
                    }
                }

                mIsDragging = false;
                mActivePointerId = INVALID_POINTER;
                if (mViewPager.isFakeDragging()) mViewPager.endFakeDrag();
                break;

            case MotionEventCompat.ACTION_POINTER_DOWN: {
                final int index = MotionEventCompat.getActionIndex(ev);
                mLastMotionX = MotionEventCompat.getX(ev, index);
                mActivePointerId = MotionEventCompat.getPointerId(ev, index);
                break;
            }

            case MotionEventCompat.ACTION_POINTER_UP:
                final int pointerIndex = MotionEventCompat.getActionIndex(ev);
                final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex);
                if (pointerId == mActivePointerId) {
                    final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
                    mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex);
                }
                mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));
                break;
        }

        return true;
    }

    @Override
    public void setViewPager(ViewPager view) {
        if (mViewPager == view) {
            return;
        }
        if (mViewPager != null) {
            mViewPager.setOnPageChangeListener(null);
        }
        if (view.getAdapter() == null) {
            throw new IllegalStateException("ViewPager does not have adapter instance.");
        }
        mViewPager = view;
        mViewPager.setOnPageChangeListener(this);
        invalidate();
    }

    @Override
    public void setViewPager(ViewPager view, int initialPosition) {
        setViewPager(view);
        setCurrentItem(initialPosition);
    }

    @Override
    public void setCurrentItem(int item) {
        if (mViewPager == null) {
            throw new IllegalStateException("ViewPager has not been bound.");
        }
        mViewPager.setCurrentItem(item);
        mCurrentPage = item;
        invalidate();
    }

    @Override
    public void notifyDataSetChanged() {
        invalidate();
    }

    @Override
    public void onPageScrollStateChanged(int state) {
        mScrollState = state;

        if (mListener != null) {
            mListener.onPageScrollStateChanged(state);
        }
    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        mCurrentPage = position;
        mPageOffset = positionOffset;
        invalidate();

        if (mListener != null) {
            mListener.onPageScrolled(position, positionOffset, positionOffsetPixels);
        }
    }

    @Override
    public void onPageSelected(int position) {
        if (mSnap || mScrollState == ViewPager.SCROLL_STATE_IDLE) {
            mCurrentPage = position;
            mSnapPage = position;
            invalidate();
        }

        if (mListener != null) {
            mListener.onPageSelected(position);
        }
    }

    @Override
    public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {
        mListener = listener;
    }

    /*
     * (non-Javadoc)
     *
     * @see android.view.View#onMeasure(int, int)
     */
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (mOrientation == HORIZONTAL) {
            setMeasuredDimension(measureLong(widthMeasureSpec), measureShort(heightMeasureSpec));
        } else {
            setMeasuredDimension(measureShort(widthMeasureSpec), measureLong(heightMeasureSpec));
        }
    }

    /**
     * Determines the width of this view
     *
     * @param measureSpec
     *            A measureSpec packed into an int
     * @return The width of the view, honoring constraints from measureSpec
     */
    private int measureLong(int measureSpec) {
        int result;
        int specMode = MeasureSpec.getMode(measureSpec);
        int specSize = MeasureSpec.getSize(measureSpec);

        if ((specMode == MeasureSpec.EXACTLY) || (mViewPager == null)) {
            //We were told how big to be
            result = specSize;
        } else {
            //Calculate the width according the views count
            final int count = mViewPager.getAdapter().getCount();
            result = (int)(getPaddingLeft() + getPaddingRight()
                    + (count * 2 * mRadius) + (count - 1) * mRadius + 1);
            //Respect AT_MOST value if that was what is called for by measureSpec
            if (specMode == MeasureSpec.AT_MOST) {
                result = Math.min(result, specSize);
            }
        }
        return result;
    }

    /**
     * Determines the height of this view
     *
     * @param measureSpec
     *            A measureSpec packed into an int
     * @return The height of the view, honoring constraints from measureSpec
     */
    private int measureShort(int measureSpec) {
        int result;
        int specMode = MeasureSpec.getMode(measureSpec);
        int specSize = MeasureSpec.getSize(measureSpec);

        if (specMode == MeasureSpec.EXACTLY) {
            //We were told how big to be
            result = specSize;
        } else {
            //Measure the height
            result = (int)(2 * mRadius + getPaddingTop() + getPaddingBottom() + 1);
            //Respect AT_MOST value if that was what is called for by measureSpec
            if (specMode == MeasureSpec.AT_MOST) {
                result = Math.min(result, specSize);
            }
        }
        return result;
    }

    @Override
    public void onRestoreInstanceState(Parcelable state) {
        SavedState savedState = (SavedState)state;
        super.onRestoreInstanceState(savedState.getSuperState());
        mCurrentPage = savedState.currentPage;
        mSnapPage = savedState.currentPage;
        requestLayout();
    }

    @Override
    public Parcelable onSaveInstanceState() {
        Parcelable superState = super.onSaveInstanceState();
        SavedState savedState = new SavedState(superState);
        savedState.currentPage = mCurrentPage;
        return savedState;
    }

    static class SavedState extends BaseSavedState {
        int currentPage;

        public SavedState(Parcelable superState) {
            super(superState);
        }

        private SavedState(Parcel in) {
            super(in);
            currentPage = in.readInt();
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);
            dest.writeInt(currentPage);
        }

        @SuppressWarnings("UnusedDeclaration")
        public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {
            @Override
            public SavedState createFromParcel(Parcel in) {
                return new SavedState(in);
            }

            @Override
            public SavedState[] newArray(int size) {
                return new SavedState[size];
            }
        };
    }
}

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* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

package com.androidopentutorials.imageslideshow.utils;

import static android.graphics.Paint.ANTI_ALIAS_FLAG;

import static android.widget.LinearLayout.HORIZONTAL;

import static android.widget.LinearLayout.VERTICAL;

import android.content.Context;

import android.content.res.Resources;

import android.content.res.TypedArray;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.Paint.Style;

import android.graphics.drawable.Drawable;

import android.os.Parcel;

import android.os.Parcelable;

import android.support.v4.view.MotionEventCompat;

import android.support.v4.view.ViewConfigurationCompat;

import android.support.v4.view.ViewPager;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.View;

import android.view.ViewConfiguration;

import com.androidopentutorials.imageslideshow.R;

/**

* Draws circles (one for each view). The current view position is filled and

* others are only stroked.

public class CirclePageIndicator extends View implements PageIndicator {

private static final int INVALID_POINTER = -1;

private float mRadius;

private final Paint mPaintPageFill = new Paint(ANTI_ALIAS_FLAG);

private final Paint mPaintStroke = new Paint(ANTI_ALIAS_FLAG);

private final Paint mPaintFill = new Paint(ANTI_ALIAS_FLAG);

private ViewPager mViewPager;

private ViewPager.OnPageChangeListener mListener;

private int mCurrentPage;

private int mSnapPage;

private float mPageOffset;

private int mScrollState;

private int mOrientation;

private boolean mCentered;

private boolean mSnap;

private int mTouchSlop;

private float mLastMotionX = -1;

private int mActivePointerId = INVALID_POINTER;

private boolean mIsDragging;

public CirclePageIndicator(Context context) {

this(context, null);

}

public CirclePageIndicator(Context context, AttributeSet attrs) {

this(context, attrs, R.attr.vpiCirclePageIndicatorStyle);

}

public CirclePageIndicator(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

if (isInEditMode()) return;

//Load defaults from resources

final Resources res = getResources();

final int defaultPageColor = res.getColor(R.color.default_circle_indicator_page_color);

//default_circle_indicator_fill_color

final int defaultFillColor = res.getColor(R.color.holo_blue_dark);

final int defaultOrientation = res.getInteger(R.integer.default_circle_indicator_orientation);

final int defaultStrokeColor = res.getColor(R.color.default_circle_indicator_stroke_color);

final float defaultStrokeWidth = res.getDimension(R.dimen.default_circle_indicator_stroke_width);

final float defaultRadius = res.getDimension(R.dimen.default_circle_indicator_radius);

final boolean defaultCentered = res.getBoolean(R.bool.default_circle_indicator_centered);

final boolean defaultSnap = res.getBoolean(R.bool.default_circle_indicator_snap);

//Retrieve styles attributes

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CirclePageIndicator, defStyle, 0);

mCentered = a.getBoolean(R.styleable.CirclePageIndicator_centered, defaultCentered);

mOrientation = a.getInt(R.styleable.CirclePageIndicator_android_orientation, defaultOrientation);

mPaintPageFill.setStyle(Style.FILL);

mPaintPageFill.setColor(a.getColor(R.styleable.CirclePageIndicator_pageColor, defaultPageColor));

mPaintStroke.setStyle(Style.STROKE);

mPaintStroke.setColor(a.getColor(R.styleable.CirclePageIndicator_strokeColor, defaultStrokeColor));

mPaintStroke.setStrokeWidth(a.getDimension(R.styleable.CirclePageIndicator_strokeWidth, defaultStrokeWidth));

mPaintFill.setStyle(Style.FILL);

mPaintFill.setColor(a.getColor(R.styleable.CirclePageIndicator_fillColor, defaultFillColor));

mRadius = a.getDimension(R.styleable.CirclePageIndicator_radius, defaultRadius);

mSnap = a.getBoolean(R.styleable.CirclePageIndicator_snap, defaultSnap);

Drawable background = a.getDrawable(R.styleable.CirclePageIndicator_android_background);

if (background != null) {

setBackgroundDrawable(background);

}

a.recycle();

final ViewConfiguration configuration = ViewConfiguration.get(context);

mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);

}

public void setCentered(boolean centered) {

mCentered = centered;

invalidate();

}

public boolean isCentered() {

return mCentered;

}

public void setPageColor(int pageColor) {

mPaintPageFill.setColor(pageColor);

invalidate();

}

public int getPageColor() {

return mPaintPageFill.getColor();

}

public void setFillColor(int fillColor) {

mPaintFill.setColor(fillColor);

invalidate();

}

public int getFillColor() {

return mPaintFill.getColor();

}

public void setOrientation(int orientation) {

switch (orientation) {

case HORIZONTAL:

case VERTICAL:

mOrientation = orientation;

requestLayout();

break;

default:

throw new IllegalArgumentException("Orientation must be either HORIZONTAL or VERTICAL.");

}

public int getOrientation() {

return mOrientation;

}

public void setStrokeColor(int strokeColor) {

mPaintStroke.setColor(strokeColor);

invalidate();

}

public int getStrokeColor() {

return mPaintStroke.getColor();

}

public void setStrokeWidth(float strokeWidth) {

mPaintStroke.setStrokeWidth(strokeWidth);

invalidate();

}

public float getStrokeWidth() {

return mPaintStroke.getStrokeWidth();

}

public void setRadius(float radius) {

mRadius = radius;

invalidate();

}

public float getRadius() {

return mRadius;

}

public void setSnap(boolean snap) {

mSnap = snap;

invalidate();

}

public boolean isSnap() {

return mSnap;

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

if (mViewPager == null) {

return;

}

final int count = mViewPager.getAdapter().getCount();

if (count == 0) {

return;

}

if (mCurrentPage >= count) {

setCurrentItem(count - 1);

return;

}

int longSize;

int longPaddingBefore;

int longPaddingAfter;

int shortPaddingBefore;

if (mOrientation == HORIZONTAL) {

longSize = getWidth();

longPaddingBefore = getPaddingLeft();

longPaddingAfter = getPaddingRight();

shortPaddingBefore = getPaddingTop();

} else {

longSize = getHeight();

longPaddingBefore = getPaddingTop();

longPaddingAfter = getPaddingBottom();

shortPaddingBefore = getPaddingLeft();

}

final float threeRadius = mRadius * 3;

final float shortOffset = shortPaddingBefore + mRadius;

float longOffset = longPaddingBefore + mRadius;

if (mCentered) {

longOffset += ((longSize - longPaddingBefore - longPaddingAfter) / 2.0f) - ((count * threeRadius) / 2.0f);

}

float dX;

float dY;

float pageFillRadius = mRadius;

if (mPaintStroke.getStrokeWidth() > 0) {

pageFillRadius -= mPaintStroke.getStrokeWidth() / 2.0f;

}

//Draw stroked circles

for (int iLoop = 0; iLoop < count; iLoop++) {

float drawLong = longOffset + (iLoop * threeRadius);

if (mOrientation == HORIZONTAL) {

dX = drawLong;

dY = shortOffset;

} else {

dX = shortOffset;

dY = drawLong;

}

// Only paint fill if not completely transparent

if (mPaintPageFill.getAlpha() > 0) {

canvas.drawCircle(dX, dY, pageFillRadius, mPaintPageFill);

}

// Only paint stroke if a stroke width was non-zero

if (pageFillRadius != mRadius) {

canvas.drawCircle(dX, dY, mRadius, mPaintStroke);

}

//Draw the filled circle according to the current scroll

float cx = (mSnap ? mSnapPage : mCurrentPage) * threeRadius;

if (!mSnap) {

cx += mPageOffset * threeRadius;

}

if (mOrientation == HORIZONTAL) {

dX = longOffset + cx;

dY = shortOffset;

} else {

dX = shortOffset;

dY = longOffset + cx;

}

canvas.drawCircle(dX, dY, mRadius, mPaintFill);

}

public boolean onTouchEvent(android.view.MotionEvent ev) {

if (super.onTouchEvent(ev)) {

return true;

}

if ((mViewPager == null) || (mViewPager.getAdapter().getCount() == 0)) {

return false;

}

final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;

switch (action) {

case MotionEvent.ACTION_DOWN:

mActivePointerId = MotionEventCompat.getPointerId(ev, 0);

mLastMotionX = ev.getX();

break;

case MotionEvent.ACTION_MOVE: {

final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, mActivePointerId);

final float x = MotionEventCompat.getX(ev, activePointerIndex);

final float deltaX = x - mLastMotionX;

if (!mIsDragging) {

if (Math.abs(deltaX) > mTouchSlop) {

mIsDragging = true;

}

if (mIsDragging) {

mLastMotionX = x;

if (mViewPager.isFakeDragging() || mViewPager.beginFakeDrag()) {

mViewPager.fakeDragBy(deltaX);

}

break;

}

case MotionEvent.ACTION_CANCEL:

case MotionEvent.ACTION_UP:

if (!mIsDragging) {

final int count = mViewPager.getAdapter().getCount();

final int width = getWidth();

final float halfWidth = width / 2f;

final float sixthWidth = width / 6f;

if ((mCurrentPage > 0) && (ev.getX() < halfWidth - sixthWidth)) {

if (action != MotionEvent.ACTION_CANCEL) {

mViewPager.setCurrentItem(mCurrentPage - 1);

}

return true;

} else if ((mCurrentPage < count - 1) && (ev.getX() > halfWidth + sixthWidth)) {

if (action != MotionEvent.ACTION_CANCEL) {

mViewPager.setCurrentItem(mCurrentPage + 1);

}

return true;

}

mIsDragging = false;

mActivePointerId = INVALID_POINTER;

if (mViewPager.isFakeDragging()) mViewPager.endFakeDrag();

break;

case MotionEventCompat.ACTION_POINTER_DOWN: {

final int index = MotionEventCompat.getActionIndex(ev);

mLastMotionX = MotionEventCompat.getX(ev, index);

mActivePointerId = MotionEventCompat.getPointerId(ev, index);

break;

}

case MotionEventCompat.ACTION_POINTER_UP:

final int pointerIndex = MotionEventCompat.getActionIndex(ev);

final int pointerId = MotionEventCompat.getPointerId(ev, pointerIndex);

if (pointerId == mActivePointerId) {

final int newPointerIndex = pointerIndex == 0 ? 1 : 0;

mActivePointerId = MotionEventCompat.getPointerId(ev, newPointerIndex);

}

mLastMotionX = MotionEventCompat.getX(ev, MotionEventCompat.findPointerIndex(ev, mActivePointerId));

break;

}

return true;

}

@Override

public void setViewPager(ViewPager view) {

if (mViewPager == view) {

return;

}

if (mViewPager != null) {

mViewPager.setOnPageChangeListener(null);

}

if (view.getAdapter() == null) {

throw new IllegalStateException("ViewPager does not have adapter instance.");

}

mViewPager = view;

mViewPager.setOnPageChangeListener(this);

invalidate();

}

@Override

public void setViewPager(ViewPager view, int initialPosition) {

setViewPager(view);

setCurrentItem(initialPosition);

}

@Override

public void setCurrentItem(int item) {

if (mViewPager == null) {

throw new IllegalStateException("ViewPager has not been bound.");

}

mViewPager.setCurrentItem(item);

mCurrentPage = item;

invalidate();

}

@Override

public void notifyDataSetChanged() {

invalidate();

}

@Override

public void onPageScrollStateChanged(int state) {

mScrollState = state;

if (mListener != null) {

mListener.onPageScrollStateChanged(state);

}

@Override

public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

mCurrentPage = position;

mPageOffset = positionOffset;

invalidate();

if (mListener != null) {

mListener.onPageScrolled(position, positionOffset, positionOffsetPixels);

}

@Override

public void onPageSelected(int position) {

if (mSnap || mScrollState == ViewPager.SCROLL_STATE_IDLE) {

mCurrentPage = position;

mSnapPage = position;

invalidate();

}

if (mListener != null) {

mListener.onPageSelected(position);

}

@Override

public void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) {

mListener = listener;

}

* (non-Javadoc)

* @see android.view.View#onMeasure(int, int)

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

if (mOrientation == HORIZONTAL) {

setMeasuredDimension(measureLong(widthMeasureSpec), measureShort(heightMeasureSpec));

} else {

setMeasuredDimension(measureShort(widthMeasureSpec), measureLong(heightMeasureSpec));

}

/**

* Determines the width of this view

* @param measureSpec

* A measureSpec packed into an int

* @return The width of the view, honoring constraints from measureSpec

private int measureLong(int measureSpec) {

int result;

int specMode = MeasureSpec.getMode(measureSpec);

int specSize = MeasureSpec.getSize(measureSpec);

if ((specMode == MeasureSpec.EXACTLY) || (mViewPager == null)) {

//We were told how big to be

result = specSize;

} else {

//Calculate the width according the views count

final int count = mViewPager.getAdapter().getCount();

result = (int)(getPaddingLeft() + getPaddingRight()

+ (count * 2 * mRadius) + (count - 1) * mRadius + 1);

//Respect AT_MOST value if that was what is called for by measureSpec

if (specMode == MeasureSpec.AT_MOST) {

result = Math.min(result, specSize);

}

return result;

}

/**

* Determines the height of this view

* @param measureSpec

* A measureSpec packed into an int

* @return The height of the view, honoring constraints from measureSpec

private int measureShort(int measureSpec) {

int result;

int specMode = MeasureSpec.getMode(measureSpec);

int specSize = MeasureSpec.getSize(measureSpec);

if (specMode == MeasureSpec.EXACTLY) {

//We were told how big to be

result = specSize;

} else {

//Measure the height

result = (int)(2 * mRadius + getPaddingTop() + getPaddingBottom() + 1);

//Respect AT_MOST value if that was what is called for by measureSpec

if (specMode == MeasureSpec.AT_MOST) {

result = Math.min(result, specSize);

}

return result;

}

@Override

public void onRestoreInstanceState(Parcelable state) {

SavedState savedState = (SavedState)state;

super.onRestoreInstanceState(savedState.getSuperState());

mCurrentPage = savedState.currentPage;

mSnapPage = savedState.currentPage;

requestLayout();

}

@Override

public Parcelable onSaveInstanceState() {

Parcelable superState = super.onSaveInstanceState();

SavedState savedState = new SavedState(superState);

savedState.currentPage = mCurrentPage;

return savedState;

}

static class SavedState extends BaseSavedState {

int currentPage;

public SavedState(Parcelable superState) {

super(superState);

}

private SavedState(Parcel in) {

super(in);

currentPage = in.readInt();

}

@Override

public void writeToParcel(Parcel dest, int flags) {

super.writeToParcel(dest, flags);

dest.writeInt(currentPage);

}

@SuppressWarnings("UnusedDeclaration")

public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {

@Override

public SavedState createFromParcel(Parcel in) {

return new SavedState(in);

}

@Override

public SavedState[] newArray(int size) {

return new SavedState[size];

}

};

}

FileUtils

In src folder, create a new class FileUtils in the package com.androidopentutorials.imageslideshow.utils. This class has utility methods to close Reader, Writer, InputStream and OutputStream which is used by JSONParser class.

package com.androidopentutorials.imageslideshow.utils;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;

public class FileUtils {

	public static void close(Reader reader) {
		if (reader != null)
			try {
				reader.close();
			} catch (IOException e) {
			}
	}

	public static void close(Writer writer) {
		if (writer != null)
			try {
				writer.close();
			} catch (IOException e) {
			}
	}

	public static void close(InputStream inputStream) {
		if (inputStream != null)
			try {
				inputStream.close();
			} catch (IOException e) {
			}
	}

	public static void close(OutputStream outputStream) {
		if (outputStream != null)
			try {
				outputStream.close();
			} catch (IOException e) {
			}
	}
}

package com.androidopentutorials.imageslideshow.utils;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.Reader;

import java.io.Writer;

public class FileUtils {

public static void close(Reader reader) {

if (reader != null)

try {

reader.close();

} catch (IOException e) {

}

public static void close(Writer writer) {

if (writer != null)

try {

writer.close();

} catch (IOException e) {

}

public static void close(InputStream inputStream) {

if (inputStream != null)

try {

inputStream.close();

} catch (IOException e) {

}

public static void close(OutputStream outputStream) {

if (outputStream != null)

try {

outputStream.close();

} catch (IOException e) {

}

GetJSONObject

In src folder, create a new class GetJSONObject in the package com.androidopentutorials.imageslideshow.json. For the given URL, it gets JSONObject. It checks for Android version, if it is greater than FROYO then it uses HttpURLConnection else uses HttpClient. For more information on this refer Android Http Clients.

package com.androidopentutorials.imageslideshow.json;

import java.io.IOException;
import org.json.JSONException;
import org.json.JSONObject;

import android.os.Build;

public class GetJSONObject {

	public static JSONObject getJSONObject(String url) throws IOException,
			JSONException {
		JSONParser jsonParser = new JSONParser();
		JSONObject jsonObject = null;
		// Use HttpURLConnection
		if (Build.VERSION.SDK_INT > Build.VERSION_CODES.FROYO) {
			jsonObject = jsonParser.getJSONHttpURLConnection(url);
		} else {
			// use HttpClient
			jsonObject = jsonParser.getJSONHttpClient(url);
		}
		return jsonObject;
	}
}

package com.androidopentutorials.imageslideshow.json;

import java.io.IOException;

import org.json.JSONException;

import org.json.JSONObject;

import android.os.Build;

public class GetJSONObject {

public static JSONObject getJSONObject(String url) throws IOException,

JSONException {

JSONParser jsonParser = new JSONParser();

JSONObject jsonObject = null;

// Use HttpURLConnection

if (Build.VERSION.SDK_INT > Build.VERSION_CODES.FROYO) {

jsonObject = jsonParser.getJSONHttpURLConnection(url);

} else {

// use HttpClient

jsonObject = jsonParser.getJSONHttpClient(url);

}

return jsonObject;

}

JSONParser

In src folder, create a new class JSONParser in the package com.androidopentutorials.imageslideshow.json. This class opens a connection to the remote json url, creates a reader object, retrieves the json string and returns a JSONObject.

package com.androidopentutorials.imageslideshow.json;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

import com.androidopentutorials.imageslideshow.utils.FileUtils;

public class JSONParser {
	
	static String json = "";

	private HttpURLConnection httpConnection;

	InputStream inputStream = null;
	BufferedReader reader = null;

	public JSONParser() {
	}

	private void openHttpUrlConnection(String urlString) throws IOException {
		Log.d("urlstring in parser", urlString+"");
		URL url = new URL(urlString);
		URLConnection connection = url.openConnection();

		httpConnection = (HttpURLConnection) connection;
		httpConnection.setConnectTimeout(30000);
		httpConnection.setRequestMethod("GET");

		httpConnection.connect();
	}

	private void openHttpClient(String urlString) throws IOException {
		DefaultHttpClient httpClient = new DefaultHttpClient();
		HttpParams httpParams = httpClient.getParams();
		HttpConnectionParams.setConnectionTimeout(httpParams, 30000);

		HttpGet httpGet = new HttpGet(urlString);
		
		HttpResponse httpResponse = httpClient.execute(httpGet);
		HttpEntity httpEntity = httpResponse.getEntity();
		inputStream = httpEntity.getContent();

		reader = new BufferedReader(
				new InputStreamReader(inputStream, "UTF-8"), 8);
	}

	// using HttpClient for <= Froyo
	public JSONObject getJSONHttpClient(String url)
			throws ClientProtocolException, IOException, JSONException {
		JSONObject jsonObject = null;
		try {
			openHttpClient(url);

			StringBuilder sb = new StringBuilder();
			String line = null;
			while ((line = reader.readLine()) != null) {
				sb.append(line + "\n");
			}

			json = sb.toString();

			Log.d("json", json);
			jsonObject = new JSONObject(json);

		} finally {
			FileUtils.close(inputStream);
			FileUtils.close(reader);
		}
		return jsonObject;
	}

	// using HttpURLConnection for > Froyo
	public JSONObject getJSONHttpURLConnection(String urlString)
			throws IOException, JSONException {

		BufferedReader reader = null;
		StringBuffer output = new StringBuffer("");
		InputStream stream = null;
		JSONObject jsonObject = null;
		try {

			openHttpUrlConnection(urlString);

			if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
				stream = httpConnection.getInputStream();

				reader = new BufferedReader(new InputStreamReader(stream,
						"UTF-8"), 8);
				String line = "";
				while ((line = reader.readLine()) != null)
					output.append(line + "\n");
				json = output.toString();
				jsonObject = new JSONObject(json);
			}

		} finally {
			FileUtils.close(stream);
			FileUtils.close(reader);
		}
		return jsonObject;
	}
}

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package com.androidopentutorials.imageslideshow.json;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLConnection;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.params.HttpConnectionParams;

import org.apache.http.params.HttpParams;

import org.json.JSONException;

import org.json.JSONObject;

import android.util.Log;

import com.androidopentutorials.imageslideshow.utils.FileUtils;

public class JSONParser {

static String json = "";

private HttpURLConnection httpConnection;

InputStream inputStream = null;

BufferedReader reader = null;

public JSONParser() {

}

private void openHttpUrlConnection(String urlString) throws IOException {

Log.d("urlstring in parser", urlString+"");

URL url = new URL(urlString);

URLConnection connection = url.openConnection();

httpConnection = (HttpURLConnection) connection;

httpConnection.setConnectTimeout(30000);

httpConnection.setRequestMethod("GET");

httpConnection.connect();

}

private void openHttpClient(String urlString) throws IOException {

DefaultHttpClient httpClient = new DefaultHttpClient();

HttpParams httpParams = httpClient.getParams();

HttpConnectionParams.setConnectionTimeout(httpParams, 30000);

HttpGet httpGet = new HttpGet(urlString);

HttpResponse httpResponse = httpClient.execute(httpGet);

HttpEntity httpEntity = httpResponse.getEntity();

inputStream = httpEntity.getContent();

reader = new BufferedReader(

new InputStreamReader(inputStream, "UTF-8"), 8);

}

// using HttpClient for <= Froyo

public JSONObject getJSONHttpClient(String url)

throws ClientProtocolException, IOException, JSONException {

JSONObject jsonObject = null;

try {

openHttpClient(url);

StringBuilder sb = new StringBuilder();

String line = null;

while ((line = reader.readLine()) != null) {

sb.append(line + "\n");

}

json = sb.toString();

Log.d("json", json);

jsonObject = new JSONObject(json);

} finally {

FileUtils.close(inputStream);

FileUtils.close(reader);

}

return jsonObject;

}

// using HttpURLConnection for > Froyo

public JSONObject getJSONHttpURLConnection(String urlString)

throws IOException, JSONException {

BufferedReader reader = null;

StringBuffer output = new StringBuffer("");

InputStream stream = null;

JSONObject jsonObject = null;

try {

openHttpUrlConnection(urlString);

if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {

stream = httpConnection.getInputStream();

reader = new BufferedReader(new InputStreamReader(stream,

"UTF-8"), 8);

String line = "";

while ((line = reader.readLine()) != null)

output.append(line + "\n");

json = output.toString();

jsonObject = new JSONObject(json);

}

} finally {

FileUtils.close(stream);

FileUtils.close(reader);

}

return jsonObject;

}

JsonReader

In src folder, create a new class JsonReader in the package com.androidopentutorials.imageslideshow.json. This class has an utility method which takes JSONObject as parameter, parses it and returns a list of products.

package com.androidopentutorials.imageslideshow.json;

import java.util.ArrayList;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import com.androidopentutorials.imageslideshow.bean.Product;
import com.androidopentutorials.imageslideshow.utils.TagName;

public class JsonReader {

	public static List<Product> getHome(JSONObject jsonObject)
			throws JSONException {
		List<Product> products = new ArrayList<Product>();

		JSONArray jsonArray = jsonObject.getJSONArray(TagName.TAG_PRODUCTS);
		Product product;
		for (int i = 0; i < jsonArray.length(); i++) {
			product = new Product();
			JSONObject productObj = jsonArray.getJSONObject(i);
			product.setId(productObj.getInt(TagName.KEY_ID));
			product.setName(productObj.getString(TagName.KEY_NAME));
			product.setImageUrl(productObj.getString(TagName.KEY_IMAGE_URL));

			products.add(product);
		}
		return products;
	}
}

package com.androidopentutorials.imageslideshow.json;

import java.util.ArrayList;

import java.util.List;

import org.json.JSONArray;

import org.json.JSONException;

import org.json.JSONObject;

import com.androidopentutorials.imageslideshow.bean.Product;

import com.androidopentutorials.imageslideshow.utils.TagName;

public class JsonReader {

public static List<Product> getHome(JSONObject jsonObject)

throws JSONException {

List<Product> products = new ArrayList<Product>();

JSONArray jsonArray = jsonObject.getJSONArray(TagName.TAG_PRODUCTS);

Product product;

for (int i = 0; i < jsonArray.length(); i++) {

product = new Product();

JSONObject productObj = jsonArray.getJSONObject(i);

product.setId(productObj.getInt(TagName.KEY_ID));

product.setName(productObj.getString(TagName.KEY_NAME));

product.setImageUrl(productObj.getString(TagName.KEY_IMAGE_URL));

products.add(product);

}

return products;

}

Product

In src folder, create a new class Product in the package com.androidopentutorials.imageslideshow.bean. This is a bean class which represents a single product.

package com.androidopentutorials.imageslideshow.bean;

import android.os.Parcel;
import android.os.Parcelable;

public class Product implements Parcelable {

	private int id;
	private String name;
	private String imageUrl;

	public Product() {
		super();
	}

	private Product(Parcel in) {
		super();
		this.id = in.readInt();
		this.name = in.readString();
		this.imageUrl = in.readString();
	}

	@Override
	public int describeContents() {
		return 0;
	}

	@Override
	public void writeToParcel(Parcel parcel, int flags) {
		parcel.writeInt(getId());
		parcel.writeString(getName());
		parcel.writeString(getImageUrl());
	}

	public static final Parcelable.Creator<Product> CREATOR = new Parcelable.Creator<Product>() {
		public Product createFromParcel(Parcel in) {
			return new Product(in);
		}

		public Product[] newArray(int size) {
			return new Product[size];
		}
	};

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getImageUrl() {
		return imageUrl;
	}

	public void setImageUrl(String imageUrl) {
		this.imageUrl = imageUrl;
	}

	public static Parcelable.Creator<Product> getCreator() {
		return CREATOR;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + id;
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		Product other = (Product) obj;
		if (id != other.id)
			return false;
		return true;
	}

	@Override
	public String toString() {
		return "Product [id=" + id + ", name=" + name + ", imageUrl="
				+ imageUrl + "]";
	}
}

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package com.androidopentutorials.imageslideshow.bean;

import android.os.Parcel;

import android.os.Parcelable;

public class Product implements Parcelable {

private int id;

private String name;

private String imageUrl;

public Product() {

super();

}

private Product(Parcel in) {

super();

this.id = in.readInt();

this.name = in.readString();

this.imageUrl = in.readString();

}

@Override

public int describeContents() {

return 0;

}

@Override

public void writeToParcel(Parcel parcel, int flags) {

parcel.writeInt(getId());

parcel.writeString(getName());

parcel.writeString(getImageUrl());

}

public static final Parcelable.Creator<Product> CREATOR = new Parcelable.Creator<Product>() {

public Product createFromParcel(Parcel in) {

return new Product(in);

}

public Product[] newArray(int size) {

return new Product[size];

}

};

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getImageUrl() {

return imageUrl;

}

public void setImageUrl(String imageUrl) {

this.imageUrl = imageUrl;

}

public static Parcelable.Creator<Product> getCreator() {

return CREATOR;

}

@Override

public int hashCode() {

final int prime = 31;

int result = 1;

result = prime * result + id;

return result;

}

@Override

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

if (getClass() != obj.getClass())

return false;

Product other = (Product) obj;

if (id != other.id)

return false;

return true;

}

@Override

public String toString() {

return "Product [id=" + id + ", name=" + name + ", imageUrl="

+ imageUrl + "]";

}

ImageSlideAdapter

In src folder, create a new class ImageSlideAdapter in the package com.androidopentutorials.imageslideshow.adapter.

This class is an implementation of PagerAdapter to populate pages inside a ViewPager.
When you implement a PagerAdapter, you must override the following methods at minimum:
- instantiateItem(ViewGroup, int)
- destroyItem(ViewGroup, int, Object)
- getCount()
- isViewFromObject(View, Object)
When the ImageView is clicked, it starts a FragmentTransaction and replaces the content frame with ProductDetailFragment.

package com.androidopentutorials.imageslideshow.adapter;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.view.PagerAdapter;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageView;

import com.androidopentutorials.imageslideshow.R;
import com.androidopentutorials.imageslideshow.bean.Product;
import com.androidopentutorials.imageslideshow.fragment.HomeFragment;
import com.androidopentutorials.imageslideshow.fragment.ProductDetailFragment;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;
import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;

public class ImageSlideAdapter extends PagerAdapter {
	ImageLoader imageLoader = ImageLoader.getInstance();
	DisplayImageOptions options;
	private ImageLoadingListener imageListener;
	FragmentActivity activity;
	List<Product> products;
	HomeFragment homeFragment;

	public ImageSlideAdapter(FragmentActivity activity, List<Product> products,
			HomeFragment homeFragment) {
		this.activity = activity;
		this.homeFragment = homeFragment;
		this.products = products;
		options = new DisplayImageOptions.Builder()
				.showImageOnFail(R.drawable.ic_error)
				.showStubImage(R.drawable.ic_launcher)
				.showImageForEmptyUri(R.drawable.ic_empty).cacheInMemory()
				.cacheOnDisc().build();

		imageListener = new ImageDisplayListener();
	}

	@Override
	public int getCount() {
		return products.size();
	}

	@Override
	public View instantiateItem(ViewGroup container, final int position) {
		LayoutInflater inflater = (LayoutInflater) activity
				.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
		View view = inflater.inflate(R.layout.vp_image, container, false);

		ImageView mImageView = (ImageView) view
				.findViewById(R.id.image_display);
		mImageView.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				Bundle arguments = new Bundle();
				Fragment fragment = null;
				Log.d("position adapter", "" + position);
				Product product = (Product) products.get(position);
				arguments.putParcelable("singleProduct", product);

				// Start a new fragment
				fragment = new ProductDetailFragment();
				fragment.setArguments(arguments);

				FragmentTransaction transaction = activity
						.getSupportFragmentManager().beginTransaction();
				transaction.replace(R.id.content_frame, fragment,
						ProductDetailFragment.ARG_ITEM_ID);
				transaction.addToBackStack(ProductDetailFragment.ARG_ITEM_ID);
				transaction.commit();
			}
		});
		imageLoader.displayImage(
				((Product) products.get(position)).getImageUrl(), mImageView,
				options, imageListener);
		container.addView(view);
		return view;
	}

	@Override
	public void destroyItem(ViewGroup container, int position, Object object) {
		container.removeView((View) object);
	}

	@Override
	public boolean isViewFromObject(View view, Object object) {
		return view == object;
	}

	private static class ImageDisplayListener extends
			SimpleImageLoadingListener {

		static final List<String> displayedImages = Collections
				.synchronizedList(new LinkedList<String>());

		@Override
		public void onLoadingComplete(String imageUri, View view,
				Bitmap loadedImage) {
			if (loadedImage != null) {
				ImageView imageView = (ImageView) view;
				boolean firstDisplay = !displayedImages.contains(imageUri);
				if (firstDisplay) {
					FadeInBitmapDisplayer.animate(imageView, 500);
					displayedImages.add(imageUri);
				}
			}
		}
	}
}

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package com.androidopentutorials.imageslideshow.adapter;

import java.util.Collections;

import java.util.LinkedList;

import java.util.List;

import android.app.Activity;

import android.graphics.Bitmap;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentTransaction;

import android.support.v4.view.PagerAdapter;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.ImageView;

import com.androidopentutorials.imageslideshow.R;

import com.androidopentutorials.imageslideshow.bean.Product;

import com.androidopentutorials.imageslideshow.fragment.HomeFragment;

import com.androidopentutorials.imageslideshow.fragment.ProductDetailFragment;

import com.nostra13.universalimageloader.core.DisplayImageOptions;

import com.nostra13.universalimageloader.core.ImageLoader;

import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;

import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener;

import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;

public class ImageSlideAdapter extends PagerAdapter {

ImageLoader imageLoader = ImageLoader.getInstance();

DisplayImageOptions options;

private ImageLoadingListener imageListener;

FragmentActivity activity;

List<Product> products;

HomeFragment homeFragment;

public ImageSlideAdapter(FragmentActivity activity, List<Product> products,

HomeFragment homeFragment) {

this.activity = activity;

this.homeFragment = homeFragment;

this.products = products;

options = new DisplayImageOptions.Builder()

.showImageOnFail(R.drawable.ic_error)

.showStubImage(R.drawable.ic_launcher)

.showImageForEmptyUri(R.drawable.ic_empty).cacheInMemory()

.cacheOnDisc().build();

imageListener = new ImageDisplayListener();

}

@Override

public int getCount() {

return products.size();

}

@Override

public View instantiateItem(ViewGroup container, final int position) {

LayoutInflater inflater = (LayoutInflater) activity

.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);

View view = inflater.inflate(R.layout.vp_image, container, false);

ImageView mImageView = (ImageView) view

.findViewById(R.id.image_display);

mImageView.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

Bundle arguments = new Bundle();

Fragment fragment = null;

Log.d("position adapter", "" + position);

Product product = (Product) products.get(position);

arguments.putParcelable("singleProduct", product);

// Start a new fragment

fragment = new ProductDetailFragment();

fragment.setArguments(arguments);

FragmentTransaction transaction = activity

.getSupportFragmentManager().beginTransaction();

transaction.replace(R.id.content_frame, fragment,

ProductDetailFragment.ARG_ITEM_ID);

transaction.addToBackStack(ProductDetailFragment.ARG_ITEM_ID);

transaction.commit();

}

});

imageLoader.displayImage(

((Product) products.get(position)).getImageUrl(), mImageView,

options, imageListener);

container.addView(view);

return view;

}

@Override

public void destroyItem(ViewGroup container, int position, Object object) {

container.removeView((View) object);

}

@Override

public boolean isViewFromObject(View view, Object object) {

return view == object;

}

private static class ImageDisplayListener extends

SimpleImageLoadingListener {

static final List<String> displayedImages = Collections

.synchronizedList(new LinkedList<String>());

@Override

public void onLoadingComplete(String imageUri, View view,

Bitmap loadedImage) {

if (loadedImage != null) {

ImageView imageView = (ImageView) view;

boolean firstDisplay = !displayedImages.contains(imageUri);

if (firstDisplay) {

FadeInBitmapDisplayer.animate(imageView, 500);

displayedImages.add(imageUri);

}

HomeFragment

In src folder, create a new class HomeFragment in the package com.androidopentutorials.imageslideshow.fragment.

ViewPager.setCurrentItem() is used to animate screen slides automatically.
We use Handler to make ViewPager auto slide after five (5) seconds.
If the user slides the screen then we make ViewPager auto slide after ten (10) seconds.

Steps:

In onResume(), if there are no products (==null) it sends a request where it executes a background AsyncTask to read remote JSON. It parses this JSON using the JsonReader.getHome() and returns list of products. In onPostExecute() it create ImageSlideAdapter and sets it in ViewPager.
For ViewPager, we set touch listener and for MotionEvent.ACTION_UP (which is executed on ViewPager touch release) we post a runnable to the handler queue to be executed after ten (10) seconds which changes teh slide to next image.
We also set a page change listener which changes the image name to reflect the current image view.

package com.androidopentutorials.imageslideshow.fragment;

import java.io.IOException;
import java.lang.ref.WeakReference;
import java.util.List;

import org.json.JSONObject;

import com.androidopentutorials.imageslideshow.R;
import com.androidopentutorials.imageslideshow.adapter.ImageSlideAdapter;
import com.androidopentutorials.imageslideshow.bean.Product;
import com.androidopentutorials.imageslideshow.json.GetJSONObject;
import com.androidopentutorials.imageslideshow.json.JsonReader;
import com.androidopentutorials.imageslideshow.utils.CheckNetworkConnection;
import com.androidopentutorials.imageslideshow.utils.CirclePageIndicator;
import com.androidopentutorials.imageslideshow.utils.PageIndicator;
import com.androidopentutorials.imageslideshow.utils.TagName;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.TextView;

public class HomeFragment extends Fragment {

	public static final String ARG_ITEM_ID = "home_fragment";

	private static final long ANIM_VIEWPAGER_DELAY = 5000;
	private static final long ANIM_VIEWPAGER_DELAY_USER_VIEW = 10000;

	// UI References
	private ViewPager mViewPager;
	TextView imgNameTxt;
	PageIndicator mIndicator;

	AlertDialog alertDialog;

	List<Product> products;
	RequestImgTask task;
	boolean stopSliding = false;
	String message;

	private Runnable animateViewPager;
	private Handler handler;

	String url = "http://192.168.3.119:8080/products.json";
	FragmentActivity activity;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		activity = getActivity();
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View view = inflater.inflate(R.layout.fragment_home, container, false);
		findViewById(view);

		mIndicator.setOnPageChangeListener(new PageChangeListener());
		mViewPager.setOnPageChangeListener(new PageChangeListener());
		mViewPager.setOnTouchListener(new OnTouchListener() {

			@Override
			public boolean onTouch(View v, MotionEvent event) {
				v.getParent().requestDisallowInterceptTouchEvent(true);
				switch (event.getAction()) {

				case MotionEvent.ACTION_CANCEL:
					break;

				case MotionEvent.ACTION_UP:
					// calls when touch release on ViewPager
					if (products != null && products.size() != 0) {
						stopSliding = false;
						runnable(products.size());
						handler.postDelayed(animateViewPager,
								ANIM_VIEWPAGER_DELAY_USER_VIEW);
					}
					break;

				case MotionEvent.ACTION_MOVE:
					// calls when ViewPager touch
					if (handler != null && stopSliding == false) {
						stopSliding = true;
						handler.removeCallbacks(animateViewPager);
					}
					break;
				}
				return false;
			}
		});

		return view;
	}

	private void findViewById(View view) {
		mViewPager = (ViewPager) view.findViewById(R.id.view_pager);
		mIndicator = (CirclePageIndicator) view.findViewById(R.id.indicator);
		imgNameTxt = (TextView) view.findViewById(R.id.img_name);
	}

	public void runnable(final int size) {
		handler = new Handler();
		animateViewPager = new Runnable() {
			public void run() {
				if (!stopSliding) {
					if (mViewPager.getCurrentItem() == size - 1) {
						mViewPager.setCurrentItem(0);
					} else {
						mViewPager.setCurrentItem(
								mViewPager.getCurrentItem() + 1, true);
					}
					handler.postDelayed(animateViewPager, ANIM_VIEWPAGER_DELAY);
				}
			}
		};
	}


	@Override
	public void onResume() {
		if (products == null) {
			sendRequest();
		} else {
			mViewPager.setAdapter(new ImageSlideAdapter(activity, products,
					HomeFragment.this));

			mIndicator.setViewPager(mViewPager);
			imgNameTxt.setText(""
					+ ((Product) products.get(mViewPager.getCurrentItem()))
							.getName());
			runnable(products.size());
			//Re-run callback
			handler.postDelayed(animateViewPager, ANIM_VIEWPAGER_DELAY);
		}
		super.onResume();
	}

	
	@Override
	public void onPause() {
		if (task != null)
			task.cancel(true);
		if (handler != null) {
			//Remove callback
			handler.removeCallbacks(animateViewPager);
		}
		super.onPause();
	}

	private void sendRequest() {
		if (CheckNetworkConnection.isConnectionAvailable(activity)) {
			task = new RequestImgTask(activity);
			task.execute(url);
		} else {
			message = getResources().getString(R.string.no_internet_connection);
			showAlertDialog(message, true);
		}
	}

	public void showAlertDialog(String message, final boolean finish) {
		alertDialog = new AlertDialog.Builder(activity).create();
		alertDialog.setMessage(message);
		alertDialog.setCancelable(false);

		alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "OK",
				new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
						dialog.dismiss();
						if (finish)
							activity.finish();
					}
				});
		alertDialog.show();
	}

	private class PageChangeListener implements OnPageChangeListener {

		@Override
		public void onPageScrollStateChanged(int state) {
			if (state == ViewPager.SCROLL_STATE_IDLE) {
				if (products != null) {
					imgNameTxt.setText(""
							+ ((Product) products.get(mViewPager
									.getCurrentItem())).getName());
				}
			}
		}

		@Override
		public void onPageScrolled(int arg0, float arg1, int arg2) {
		}

		@Override
		public void onPageSelected(int arg0) {
		}
	}

	@Override
	public void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
	}

	private class RequestImgTask extends AsyncTask<String, Void, List<Product>> {
		private final WeakReference<Activity> activityWeakRef;
		Throwable error;

		public RequestImgTask(Activity context) {
			this.activityWeakRef = new WeakReference<Activity>(context);
		}

		@Override
		protected void onPreExecute() {
			super.onPreExecute();
		}

		@Override
		protected List<Product> doInBackground(String... urls) {
			try {
				JSONObject jsonObject = getJsonObject(urls[0]);
				if (jsonObject != null) {
					boolean status = jsonObject.getBoolean(TagName.TAG_STATUS);

					if (status) {
						JSONObject jsonData = jsonObject
								.getJSONObject(TagName.TAG_DATA);
						if (jsonData != null) {
							products = JsonReader.getHome(jsonData);

						} else {
							message = jsonObject.getString(TagName.TAG_DATA);
						}
					} else {
						message = jsonObject.getString(TagName.TAG_DATA);
					}
				}
			} catch (Exception e) {
				e.printStackTrace();
			}
			return products;
		}

		/**
		 * It returns jsonObject for the specified url.
		 * 
		 * @param url
		 * @return JSONObject
		 */
		public JSONObject getJsonObject(String url) {
			JSONObject jsonObject = null;
			try {
				jsonObject = GetJSONObject.getJSONObject(url);
			} catch (Exception e) {
			}
			return jsonObject;
		}

		@Override
		protected void onPostExecute(List<Product> result) {
			super.onPostExecute(result);

			if (activityWeakRef != null && !activityWeakRef.get().isFinishing()) {
				if (error != null && error instanceof IOException) {
					message = getResources().getString(R.string.time_out);
					showAlertDialog(message, true);
				} else if (error != null) {
					message = getResources().getString(R.string.error_occured);
					showAlertDialog(message, true);
				} else {
					products = result;
					if (result != null) {
						if (products != null && products.size() != 0) {

							mViewPager.setAdapter(new ImageSlideAdapter(
									activity, products, HomeFragment.this));

							mIndicator.setViewPager(mViewPager);
							imgNameTxt.setText(""
									+ ((Product) products.get(mViewPager
											.getCurrentItem())).getName());
							runnable(products.size());
							handler.postDelayed(animateViewPager,
									ANIM_VIEWPAGER_DELAY);
						} else {
							imgNameTxt.setText("No Products");
						}
					} else {
					}
				}
			}
		}
	}
}

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package com.androidopentutorials.imageslideshow.fragment;

import java.io.IOException;

import java.lang.ref.WeakReference;

import java.util.List;

import org.json.JSONObject;

import com.androidopentutorials.imageslideshow.R;

import com.androidopentutorials.imageslideshow.adapter.ImageSlideAdapter;

import com.androidopentutorials.imageslideshow.bean.Product;

import com.androidopentutorials.imageslideshow.json.GetJSONObject;

import com.androidopentutorials.imageslideshow.json.JsonReader;

import com.androidopentutorials.imageslideshow.utils.CheckNetworkConnection;

import com.androidopentutorials.imageslideshow.utils.CirclePageIndicator;

import com.androidopentutorials.imageslideshow.utils.PageIndicator;

import com.androidopentutorials.imageslideshow.utils.TagName;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.os.AsyncTask;

import android.os.Bundle;

import android.os.Handler;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentActivity;

import android.support.v4.view.ViewPager;

import android.support.v4.view.ViewPager.OnPageChangeListener;

import android.view.LayoutInflater;

import android.view.MotionEvent;

import android.view.View;

import android.view.View.OnTouchListener;

import android.view.ViewGroup;

import android.widget.TextView;

public class HomeFragment extends Fragment {

public static final String ARG_ITEM_ID = "home_fragment";

private static final long ANIM_VIEWPAGER_DELAY = 5000;

private static final long ANIM_VIEWPAGER_DELAY_USER_VIEW = 10000;

// UI References

private ViewPager mViewPager;

TextView imgNameTxt;

PageIndicator mIndicator;

AlertDialog alertDialog;

List<Product> products;

RequestImgTask task;

boolean stopSliding = false;

String message;

private Runnable animateViewPager;

private Handler handler;

String url = "http://192.168.3.119:8080/products.json";

FragmentActivity activity;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

activity = getActivity();

}

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragment_home, container, false);

findViewById(view);

mIndicator.setOnPageChangeListener(new PageChangeListener());

mViewPager.setOnPageChangeListener(new PageChangeListener());

mViewPager.setOnTouchListener(new OnTouchListener() {

@Override

public boolean onTouch(View v, MotionEvent event) {

v.getParent().requestDisallowInterceptTouchEvent(true);

switch (event.getAction()) {

case MotionEvent.ACTION_CANCEL:

break;

case MotionEvent.ACTION_UP:

// calls when touch release on ViewPager

if (products != null && products.size() != 0) {

stopSliding = false;

runnable(products.size());

handler.postDelayed(animateViewPager,

ANIM_VIEWPAGER_DELAY_USER_VIEW);

}

break;

case MotionEvent.ACTION_MOVE:

// calls when ViewPager touch

if (handler != null && stopSliding == false) {

stopSliding = true;

handler.removeCallbacks(animateViewPager);

}

break;

}

return false;

}

});

return view;

}

private void findViewById(View view) {

mViewPager = (ViewPager) view.findViewById(R.id.view_pager);

mIndicator = (CirclePageIndicator) view.findViewById(R.id.indicator);

imgNameTxt = (TextView) view.findViewById(R.id.img_name);

}

public void runnable(final int size) {

handler = new Handler();

animateViewPager = new Runnable() {

public void run() {

if (!stopSliding) {

if (mViewPager.getCurrentItem() == size - 1) {

mViewPager.setCurrentItem(0);

} else {

mViewPager.setCurrentItem(

mViewPager.getCurrentItem() + 1, true);

}

handler.postDelayed(animateViewPager, ANIM_VIEWPAGER_DELAY);

}

};

}

@Override

public void onResume() {

if (products == null) {

sendRequest();

} else {

mViewPager.setAdapter(new ImageSlideAdapter(activity, products,

HomeFragment.this));

mIndicator.setViewPager(mViewPager);

imgNameTxt.setText(""

+ ((Product) products.get(mViewPager.getCurrentItem()))

.getName());

runnable(products.size());

//Re-run callback

handler.postDelayed(animateViewPager, ANIM_VIEWPAGER_DELAY);

}

super.onResume();

}

@Override

public void onPause() {

if (task != null)

task.cancel(true);

if (handler != null) {

//Remove callback

handler.removeCallbacks(animateViewPager);

}

super.onPause();

}

private void sendRequest() {

if (CheckNetworkConnection.isConnectionAvailable(activity)) {

task = new RequestImgTask(activity);

task.execute(url);

} else {

message = getResources().getString(R.string.no_internet_connection);

showAlertDialog(message, true);

}

public void showAlertDialog(String message, final boolean finish) {

alertDialog = new AlertDialog.Builder(activity).create();

alertDialog.setMessage(message);

alertDialog.setCancelable(false);

alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "OK",

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int which) {

dialog.dismiss();

if (finish)

activity.finish();

}

});

alertDialog.show();

}

private class PageChangeListener implements OnPageChangeListener {

@Override

public void onPageScrollStateChanged(int state) {

if (state == ViewPager.SCROLL_STATE_IDLE) {

if (products != null) {

imgNameTxt.setText(""

+ ((Product) products.get(mViewPager

.getCurrentItem())).getName());

}

@Override

public void onPageScrolled(int arg0, float arg1, int arg2) {

}

@Override

public void onPageSelected(int arg0) {

}

@Override

public void onSaveInstanceState(Bundle outState) {

super.onSaveInstanceState(outState);

}

private class RequestImgTask extends AsyncTask<String, Void, List<Product>> {

private final WeakReference<Activity> activityWeakRef;

Throwable error;

public RequestImgTask(Activity context) {

this.activityWeakRef = new WeakReference<Activity>(context);

}

@Override

protected void onPreExecute() {

super.onPreExecute();

}

@Override

protected List<Product> doInBackground(String... urls) {

try {

JSONObject jsonObject = getJsonObject(urls[0]);

if (jsonObject != null) {

boolean status = jsonObject.getBoolean(TagName.TAG_STATUS);

if (status) {

JSONObject jsonData = jsonObject

.getJSONObject(TagName.TAG_DATA);

if (jsonData != null) {

products = JsonReader.getHome(jsonData);

} else {

message = jsonObject.getString(TagName.TAG_DATA);

}

} else {

message = jsonObject.getString(TagName.TAG_DATA);

}

} catch (Exception e) {

e.printStackTrace();

}

return products;

}

/**

* It returns jsonObject for the specified url.

* @param url

* @return JSONObject

public JSONObject getJsonObject(String url) {

JSONObject jsonObject = null;

try {

jsonObject = GetJSONObject.getJSONObject(url);

} catch (Exception e) {

}

return jsonObject;

}

@Override

protected void onPostExecute(List<Product> result) {

super.onPostExecute(result);

if (activityWeakRef != null && !activityWeakRef.get().isFinishing()) {

if (error != null && error instanceof IOException) {

message = getResources().getString(R.string.time_out);

showAlertDialog(message, true);

} else if (error != null) {

message = getResources().getString(R.string.error_occured);

showAlertDialog(message, true);

} else {

products = result;

if (result != null) {

if (products != null && products.size() != 0) {

mViewPager.setAdapter(new ImageSlideAdapter(

activity, products, HomeFragment.this));

mIndicator.setViewPager(mViewPager);

imgNameTxt.setText(""

+ ((Product) products.get(mViewPager

.getCurrentItem())).getName());

runnable(products.size());

handler.postDelayed(animateViewPager,

ANIM_VIEWPAGER_DELAY);

} else {

imgNameTxt.setText("No Products");

}

} else {

}

ProductDetailFragment

In src folder, create a new class ProductDetailFragment in the package com.androidopentutorials.imageslideshow.fragment. This class gets a single product from bundle and displays product image, id and name.

package com.androidopentutorials.imageslideshow.fragment;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import com.androidopentutorials.imageslideshow.R;
import com.androidopentutorials.imageslideshow.bean.Product;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;
import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;

public class ProductDetailFragment extends Fragment {

	TextView pdtIdTxt;
	TextView pdtNameTxt;
	ImageView pdtImg;
	Activity activity;

	ImageLoader imageLoader = ImageLoader.getInstance();
	DisplayImageOptions options;
	private ImageLoadingListener imageListener;

	Product product;

	public static final String ARG_ITEM_ID = "pdt_detail_fragment";

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		activity = getActivity();
		options = new DisplayImageOptions.Builder()
				.showImageOnFail(R.drawable.ic_launcher)
				.showStubImage(R.drawable.ic_launcher)
				.showImageForEmptyUri(R.drawable.ic_launcher).cacheInMemory()
				.cacheOnDisc().build();

		imageListener = new ImageDisplayListener();

	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View view = inflater.inflate(R.layout.fragment_pdt_detail, container,
				false);
		findViewById(view);

		Bundle bundle = this.getArguments();
		if (bundle != null) {
			product = bundle.getParcelable("singleProduct");
			setProductItem(product);
		}

		return view;
	}

	private void findViewById(View view) {

		pdtNameTxt = (TextView) view.findViewById(R.id.pdt_name);
		pdtIdTxt = (TextView) view.findViewById(R.id.product_id_text);

		pdtImg = (ImageView) view.findViewById(R.id.product_detail_img);
	}

	private static class ImageDisplayListener extends
			SimpleImageLoadingListener {

		static final List<String> displayedImages = Collections
				.synchronizedList(new LinkedList<String>());

		@Override
		public void onLoadingComplete(String imageUri, View view,
				Bitmap loadedImage) {
			if (loadedImage != null) {
				ImageView imageView = (ImageView) view;
				boolean firstDisplay = !displayedImages.contains(imageUri);
				if (firstDisplay) {
					FadeInBitmapDisplayer.animate(imageView, 500);
					displayedImages.add(imageUri);

				}
			}
		}
	}

	private void setProductItem(Product resultProduct) {
		pdtNameTxt.setText("" + resultProduct.getName());
		pdtIdTxt.setText("Product Id: " + resultProduct.getId());

		imageLoader.displayImage(resultProduct.getImageUrl(), pdtImg, options,
				imageListener);
	}
}

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package com.androidopentutorials.imageslideshow.fragment;

import java.util.Collections;

import java.util.LinkedList;

import java.util.List;

import android.app.Activity;

import android.graphics.Bitmap;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ImageView;

import android.widget.TextView;

import com.androidopentutorials.imageslideshow.R;

import com.androidopentutorials.imageslideshow.bean.Product;

import com.nostra13.universalimageloader.core.DisplayImageOptions;

import com.nostra13.universalimageloader.core.ImageLoader;

import com.nostra13.universalimageloader.core.assist.ImageLoadingListener;

import com.nostra13.universalimageloader.core.assist.SimpleImageLoadingListener;

import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;

public class ProductDetailFragment extends Fragment {

TextView pdtIdTxt;

TextView pdtNameTxt;

ImageView pdtImg;

Activity activity;

ImageLoader imageLoader = ImageLoader.getInstance();

DisplayImageOptions options;

private ImageLoadingListener imageListener;

Product product;

public static final String ARG_ITEM_ID = "pdt_detail_fragment";

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

activity = getActivity();

options = new DisplayImageOptions.Builder()

.showImageOnFail(R.drawable.ic_launcher)

.showStubImage(R.drawable.ic_launcher)

.showImageForEmptyUri(R.drawable.ic_launcher).cacheInMemory()

.cacheOnDisc().build();

imageListener = new ImageDisplayListener();

}

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragment_pdt_detail, container,

false);

findViewById(view);

Bundle bundle = this.getArguments();

if (bundle != null) {

product = bundle.getParcelable("singleProduct");

setProductItem(product);

}

return view;

}

private void findViewById(View view) {

pdtNameTxt = (TextView) view.findViewById(R.id.pdt_name);

pdtIdTxt = (TextView) view.findViewById(R.id.product_id_text);

pdtImg = (ImageView) view.findViewById(R.id.product_detail_img);

}

private static class ImageDisplayListener extends

SimpleImageLoadingListener {

static final List<String> displayedImages = Collections

.synchronizedList(new LinkedList<String>());

@Override

public void onLoadingComplete(String imageUri, View view,

Bitmap loadedImage) {

if (loadedImage != null) {

ImageView imageView = (ImageView) view;

boolean firstDisplay = !displayedImages.contains(imageUri);

if (firstDisplay) {

FadeInBitmapDisplayer.animate(imageView, 500);

displayedImages.add(imageUri);

}

private void setProductItem(Product resultProduct) {

pdtNameTxt.setText("" + resultProduct.getName());

pdtIdTxt.setText("Product Id: " + resultProduct.getId());

imageLoader.displayImage(resultProduct.getImageUrl(), pdtImg, options,

imageListener);

}

MainActivity

In src folder, create a new class MainActivity in the package com.androidopentutorials.imageslideshow.

This is the main activity class.
When the app starts, it begins a new FragmentTransaction and starts HomeFragment.
It handles proper back navigation of fragments on back key pressed by overriding onBackPressed().
It handles fragment orientation changes and retains the fragment state by overriding onSaveInstanceState().

package com.androidopentutorials.imageslideshow;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.Menu;

import com.androidopentutorials.imageslideshow.fragment.HomeFragment;
import com.androidopentutorials.imageslideshow.fragment.ProductDetailFragment;

public class MainActivity extends FragmentActivity {

	private Fragment contentFragment;
	HomeFragment homeFragment;
	ProductDetailFragment pdtDetailFragment;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		FragmentManager fragmentManager = getSupportFragmentManager();

		if (savedInstanceState != null) {
			if (savedInstanceState.containsKey("content")) {
				String content = savedInstanceState.getString("content");
				if (content.equals(ProductDetailFragment.ARG_ITEM_ID)) {
					if (fragmentManager
							.findFragmentByTag(ProductDetailFragment.ARG_ITEM_ID) != null) {
						contentFragment = fragmentManager
								.findFragmentByTag(ProductDetailFragment.ARG_ITEM_ID);
					}
				}
			}
			if (fragmentManager.findFragmentByTag(HomeFragment.ARG_ITEM_ID) != null) {
				homeFragment = (HomeFragment) fragmentManager
						.findFragmentByTag(HomeFragment.ARG_ITEM_ID);
				contentFragment = homeFragment;
			}
		} else {
			homeFragment = new HomeFragment();
			switchContent(homeFragment, HomeFragment.ARG_ITEM_ID);
		}
	}

	@Override
	protected void onSaveInstanceState(Bundle outState) {
		if (contentFragment instanceof HomeFragment) {
			outState.putString("content", HomeFragment.ARG_ITEM_ID);
		} else {
			outState.putString("content", ProductDetailFragment.ARG_ITEM_ID);
		}
		super.onSaveInstanceState(outState);
	}

	public void switchContent(Fragment fragment, String tag) {
		FragmentManager fragmentManager = getSupportFragmentManager();
		while (fragmentManager.popBackStackImmediate())
			;

		if (fragment != null) {
			FragmentTransaction transaction = fragmentManager
					.beginTransaction();
			transaction.replace(R.id.content_frame, fragment, tag);
			// Only ProductDetailFragment is added to the back stack.
			if (!(fragment instanceof HomeFragment)) {
				transaction.addToBackStack(tag);
			}
			transaction.commit();
			contentFragment = fragment;
		}
	}

	@Override
	public void onBackPressed() {
		FragmentManager fm = getSupportFragmentManager();
		if (fm.getBackStackEntryCount() > 0) {
			super.onBackPressed();
		} else if (contentFragment instanceof HomeFragment
				|| fm.getBackStackEntryCount() == 0) {
			finish();
		} 
	}
	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
}

package com.androidopentutorials.imageslideshow;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentManager;

import android.support.v4.app.FragmentTransaction;

import android.view.Menu;

import com.androidopentutorials.imageslideshow.fragment.HomeFragment;

import com.androidopentutorials.imageslideshow.fragment.ProductDetailFragment;

public class MainActivity extends FragmentActivity {

private Fragment contentFragment;

HomeFragment homeFragment;

ProductDetailFragment pdtDetailFragment;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

FragmentManager fragmentManager = getSupportFragmentManager();

if (savedInstanceState != null) {

if (savedInstanceState.containsKey("content")) {

String content = savedInstanceState.getString("content");

if (content.equals(ProductDetailFragment.ARG_ITEM_ID)) {

if (fragmentManager

.findFragmentByTag(ProductDetailFragment.ARG_ITEM_ID) != null) {

contentFragment = fragmentManager

.findFragmentByTag(ProductDetailFragment.ARG_ITEM_ID);

}

if (fragmentManager.findFragmentByTag(HomeFragment.ARG_ITEM_ID) != null) {

homeFragment = (HomeFragment) fragmentManager

.findFragmentByTag(HomeFragment.ARG_ITEM_ID);

contentFragment = homeFragment;

}

} else {

homeFragment = new HomeFragment();

switchContent(homeFragment, HomeFragment.ARG_ITEM_ID);

}

@Override

protected void onSaveInstanceState(Bundle outState) {

if (contentFragment instanceof HomeFragment) {

outState.putString("content", HomeFragment.ARG_ITEM_ID);

} else {

outState.putString("content", ProductDetailFragment.ARG_ITEM_ID);

}

super.onSaveInstanceState(outState);

}

public void switchContent(Fragment fragment, String tag) {

FragmentManager fragmentManager = getSupportFragmentManager();

while (fragmentManager.popBackStackImmediate())

;

if (fragment != null) {

FragmentTransaction transaction = fragmentManager

.beginTransaction();

transaction.replace(R.id.content_frame, fragment, tag);

// Only ProductDetailFragment is added to the back stack.

if (!(fragment instanceof HomeFragment)) {

transaction.addToBackStack(tag);

}

transaction.commit();

contentFragment = fragment;

}

@Override

public void onBackPressed() {

FragmentManager fm = getSupportFragmentManager();

if (fm.getBackStackEntryCount() > 0) {

super.onBackPressed();

} else if (contentFragment instanceof HomeFragment

|| fm.getBackStackEntryCount() == 0) {

finish();

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

AppData

In src folder, create a new class AppData in the package com.androidopentutorials.imageslideshow.

Universal ImageLoader configuration (ImageLoaderConfiguration) is global for application hence create a class which extends android.app.Application and create a global configuration and initialize ImageLoader.

package com.androidopentutorials.imageslideshow;

import android.app.Application;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Build;
import android.os.StrictMode;
import android.view.View;

import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.assist.QueueProcessingType;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;

public class AppData extends Application {
	public static final boolean DEVELOPER_MODE = false;
	View footerView;

	@SuppressWarnings("unused")
	public void onCreate() {
		super.onCreate();
		if (DEVELOPER_MODE
				&& Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
			StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
					.detectAll().penaltyDialog().build());
			StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
					.detectAll().penaltyDeath().build());
		}

		initImageLoader(getApplicationContext());
	}

	public static void initImageLoader(Context context) {
		DisplayImageOptions options = new DisplayImageOptions.Builder()
				.showImageForEmptyUri(R.drawable.ic_empty)
				.showImageOnFail(R.drawable.ic_error).resetViewBeforeLoading()
				.cacheOnDisc().imageScaleType(ImageScaleType.EXACTLY)
				.bitmapConfig(Bitmap.Config.RGB_565)
				.displayer(new FadeInBitmapDisplayer(300)).build();

		ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
				context).threadPriority(Thread.NORM_PRIORITY - 2)
				.denyCacheImageMultipleSizesInMemory()
				.discCacheFileNameGenerator(new Md5FileNameGenerator())
				.defaultDisplayImageOptions(options)
				.tasksProcessingOrder(QueueProcessingType.LIFO).build();

		ImageLoader.getInstance().init(config);
	}
}