Android SQLite Example | Android Open Tutorials

Project Description

This Android SQLite tutorial explains the following,

How to create a new database with a table (Employee table) in your application.
Write SQLite Data Access Object (DAO) class for handling database create, read, update and delete (CRUD) operations on the table.
Add an Action bar menu item icon to insert employee details into database.
Retrieve employee details from database and display it in ListView.
Custom dialog fragment to update employee details.
Communication between dialog fragment and list fragment (via main activity using an interface) when employee details are updated.
Delete employee details on list item long click event.
Proper back navigation of fragments on back key press.
How to handle fragment orientation changes and retain the state of the fragment.

Employee Table

This Android SQLite example uses an employee table with the following structure.

Field	Type	Key	Extra
id	int	Primary Key	auto_increment
name	text
salary	double
dob	Date

Android Project

Create a new Android project and name it as AndroidSQLite.

Download “Android SQLite Example” AndroidSQLite.zip – Downloaded 9775 times – 1 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="transparent">#00000000</color>
    <color name="list_item_bg">#ffffff</color>
    <color name="view_divider_color">#BABABA</color>
</resources>

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

<color name="list_item_bg">#ffffff</color>

<color name="view_divider_color">#BABABA</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">AndroidSQLite</string>
    <string name="add_emp">Add Employee</string>
    <string name="update_emp">Update Employee</string>
    <string name="name">Employee Name</string>
    <string name="dob">Employee DOB</string>
    <string name="salary">Employee Salary</string>
    <string name="update">Update</string>
    <string name="add">Add</string>
    <string name="reset">Reset</string>
    <string name="cancel">Cancel</string>

</resources>

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

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

<string name="add_emp">Add Employee</string>

<string name="update_emp">Update Employee</string>

<string name="name">Employee Name</string>

<string name="dob">Employee DOB</string>

<string name="salary">Employee Salary</string>

<string name="update">Update</string>

<string name="reset">Reset</string>

<string name="cancel">Cancel</string>

</resources>

Action Bar Menu Item (main.xml)

Open res/menu/main.xml and edit to have the content as shown below. This file defines the menu item in action bar for adding an employee. When this menu item is clicked, it displays EmpAddFragment which is used to add an employee record to SQLite database.

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

    <item
        android:id="@+id/action_add"
        android:icon="@android:drawable/ic_menu_add"
        android:orderInCategory="100"
        android:showAsAction="ifRoom|withText"
        android:title="@string/add_emp"/>

</menu>

<item

android:id="@+id/action_add"

android:icon="@android:drawable/ic_menu_add"

android:orderInCategory="100"

android:showAsAction="ifRoom|withText"

android:title="@string/add_emp"/>

</menu>

Layout files

activity_main.xml

This is the main layout file. Here we define a Framelayout which is used to hold all the 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_add_emp.xml

This layout file is used by EmpAddFragment to add employee details (name, dob, salary).

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="5dp" >

        <EditText
            android:id="@+id/etxt_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="@string/name"
            android:nextFocusDown="@+id/etxt_dob"
            android:singleLine="true" />

        <EditText
            android:id="@+id/etxt_dob"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/etxt_name"
            android:hint="@string/dob"
            android:nextFocusDown="@+id/etxt_salary"
            android:singleLine="true" />

        <EditText
            android:id="@+id/etxt_salary"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/etxt_dob"
            android:hint="@string/salary"
            android:inputType="numberDecimal"
            android:singleLine="true" />

        <LinearLayout
            android:id="@+id/layout_submit"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/etxt_salary"
            android:layout_margin="5dp"
            android:orientation="horizontal"
            android:weightSum="2" >

            <Button
                android:id="@+id/button_add"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="@string/add" />

            <Button
                android:id="@+id/button_reset"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="@string/reset" />
        </LinearLayout>
    </RelativeLayout>

</ScrollView>

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

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

android:layout_width="match_parent"

android:layout_height="match_parent" >

<RelativeLayout

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_margin="5dp" >

<EditText

android:id="@+id/etxt_name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:ems="10"

android:hint="@string/name"

android:nextFocusDown="@+id/etxt_dob"

android:singleLine="true" />

<EditText

android:id="@+id/etxt_dob"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@+id/etxt_name"

android:hint="@string/dob"

android:nextFocusDown="@+id/etxt_salary"

android:singleLine="true" />

<EditText

android:id="@+id/etxt_salary"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@+id/etxt_dob"

android:hint="@string/salary"

android:inputType="numberDecimal"

android:singleLine="true" />

<LinearLayout

android:id="@+id/layout_submit"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_below="@+id/etxt_salary"

android:layout_margin="5dp"

android:orientation="horizontal"

android:weightSum="2" >

<Button

android:id="@+id/button_add"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="@string/add" />

<Button

android:id="@+id/button_reset"

android:layout_width="0dp"

android:layout_height="wrap_content"

android:layout_weight="1"

android:text="@string/reset" />

</LinearLayout>

</RelativeLayout>

</ScrollView>

fragment_emp_list.xml

This layout file defines a ListView which is used by EmpListFragment to display list of employees.

<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:background="#EDEDED" >

    <ListView
        android:id="@+id/list_emp"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:divider="@color/transparent"
        android:dividerHeight="10dp"
        android:drawSelectorOnTop="true"
        android:footerDividersEnabled="false"
        android:padding="10dp"
        android:scrollbarStyle="outsideOverlay" />

</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:background="#EDEDED" >

<ListView

android:id="@+id/list_emp"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:divider="@color/transparent"

android:dividerHeight="10dp"

android:drawSelectorOnTop="true"

android:footerDividersEnabled="false"

android:padding="10dp"

android:scrollbarStyle="outsideOverlay" />

</RelativeLayout>

list_item.xml

This file defines custom layout for ListView item (employee row) which is used by EmpListAdapter.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@color/list_item_bg"
    android:descendantFocusability="blocksDescendants" >

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

        <TextView
            android:id="@+id/txt_emp_id"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="6dp" />

        <TextView
            android:id="@+id/txt_emp_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@+id/txt_emp_id"
            android:padding="6dp" />

        <TextView
            android:id="@+id/txt_emp_dob"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/txt_emp_name"
            android:padding="6dp" />

        <TextView
            android:id="@+id/txt_emp_salary"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/txt_emp_dob"
            android:padding="6dp" />
    </RelativeLayout>

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

</RelativeLayout>

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

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

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:background="@color/list_item_bg"

android:descendantFocusability="blocksDescendants" >

<RelativeLayout

android:id="@+id/layout_item"

android:layout_width="fill_parent"

android:layout_height="wrap_content" >

<TextView

android:id="@+id/txt_emp_id"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:padding="6dp" />

<TextView

android:id="@+id/txt_emp_name"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_toRightOf="@+id/txt_emp_id"

android:padding="6dp" />

<TextView

android:id="@+id/txt_emp_dob"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@+id/txt_emp_name"

android:padding="6dp" />

<TextView

android:id="@+id/txt_emp_salary"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_below="@+id/txt_emp_dob"

android:padding="6dp" />

</RelativeLayout>

<View

android:layout_width="match_parent"

android:layout_height="1dp"

android:layout_below="@+id/layout_item"

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

</RelativeLayout>

Create a SQLite database in Android

DataBaseHelper class

In src folder, create a new class DataBaseHelper in the package com.androidopentutorials.sqlite.db. This class extends SQLiteOpenHelper which manages database creation and version management.

package com.androidopentutorials.sqlite.db;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DataBaseHelper extends SQLiteOpenHelper {

	private static final String DATABASE_NAME = "employeedb";
	private static final int DATABASE_VERSION = 1;

	public static final String EMPLOYEE_TABLE = "employee";

	public static final String ID_COLUMN = "id";
	public static final String NAME_COLUMN = "name";
	public static final String EMPLOYEE_DOB = "dob";
	public static final String EMPLOYEE_SALARY = "salary";

	public static final String CREATE_EMPLOYEE_TABLE = "CREATE TABLE "
			+ EMPLOYEE_TABLE + "(" + ID_COLUMN + " INTEGER PRIMARY KEY, "
			+ NAME_COLUMN + " TEXT, " + EMPLOYEE_SALARY + " DOUBLE, "
			+ EMPLOYEE_DOB + " DATE" + ")";

	private static DataBaseHelper instance;

	public static synchronized DataBaseHelper getHelper(Context context) {
		if (instance == null)
			instance = new DataBaseHelper(context);
		return instance;
	}

	private DataBaseHelper(Context context) {
		super(context, DATABASE_NAME, null, DATABASE_VERSION);
	}

	@Override
	public void onOpen(SQLiteDatabase db) {
		super.onOpen(db);
	}

	@Override
	public void onCreate(SQLiteDatabase db) {
		db.execSQL(CREATE_EMPLOYEE_TABLE);
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
	}
}

package com.androidopentutorials.sqlite.db;

import android.content.Context;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteOpenHelper;

public class DataBaseHelper extends SQLiteOpenHelper {

private static final String DATABASE_NAME = "employeedb";

private static final int DATABASE_VERSION = 1;

public static final String EMPLOYEE_TABLE = "employee";

public static final String ID_COLUMN = "id";

public static final String NAME_COLUMN = "name";

public static final String EMPLOYEE_DOB = "dob";

public static final String EMPLOYEE_SALARY = "salary";

public static final String CREATE_EMPLOYEE_TABLE = "CREATE TABLE "

+ EMPLOYEE_TABLE + "(" + ID_COLUMN + " INTEGER PRIMARY KEY, "

+ NAME_COLUMN + " TEXT, " + EMPLOYEE_SALARY + " DOUBLE, "

+ EMPLOYEE_DOB + " DATE" + ")";

private static DataBaseHelper instance;

public static synchronized DataBaseHelper getHelper(Context context) {

if (instance == null)

instance = new DataBaseHelper(context);

return instance;

}

private DataBaseHelper(Context context) {

super(context, DATABASE_NAME, null, DATABASE_VERSION);

}

@Override

public void onOpen(SQLiteDatabase db) {

super.onOpen(db);

}

@Override

public void onCreate(SQLiteDatabase db) {

db.execSQL(CREATE_EMPLOYEE_TABLE);

}

@Override

public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}

Employee DB DAO class

Create a new class EmployeeDBDAO in the package com.androidopentutorials.sqlite.db. To write to and read from the database we need a SQLiteDatabase object (that represents the database) which can be obtained by calling getWritableDatabase() on the database helper.

Then we will create an EmployeeDAO class which will extend this class and using SQLiteDatabase object provides methods for SQLite CRUD (Create, Read, Update, Delete) operations.

package com.androidopentutorials.sqlite.db;

import android.content.Context;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;

public class EmployeeDBDAO {

	protected SQLiteDatabase database;
	private DataBaseHelper dbHelper;
	private Context mContext;

	public EmployeeDBDAO(Context context) {
		this.mContext = context;
		dbHelper = DataBaseHelper.getHelper(mContext);
		open();
		
	}

	public void open() throws SQLException {
		if(dbHelper == null)
			dbHelper = DataBaseHelper.getHelper(mContext);
		database = dbHelper.getWritableDatabase();
	}
	
	/*public void close() {
		dbHelper.close();
		database = null;
	}*/
}

package com.androidopentutorials.sqlite.db;

import android.content.Context;

import android.database.SQLException;

import android.database.sqlite.SQLiteDatabase;

public class EmployeeDBDAO {

protected SQLiteDatabase database;

private DataBaseHelper dbHelper;

private Context mContext;

public EmployeeDBDAO(Context context) {

this.mContext = context;

dbHelper = DataBaseHelper.getHelper(mContext);

open();

}

public void open() throws SQLException {

if(dbHelper == null)

dbHelper = DataBaseHelper.getHelper(mContext);

database = dbHelper.getWritableDatabase();

}

/*public void close() {

dbHelper.close();

database = null;

}*/

}

Insert a new record in SQLite database

Employee

In src folder, create a new class Employee in the package com.androidopentutorials.sqlite.to.

This class represents an Employee stored in a database.
This class implements Parcelable interface because we need to bundle the employee object as argument when showing custom dialog fragment to update employee details.

package com.androidopentutorials.sqlite.to;

import java.util.Date;
import android.os.Parcel;
import android.os.Parcelable;

public class Employee implements Parcelable {

	private int id;
	private String name;
	private Date dateOfBirth;
	private double salary;

	public Employee() {
		super();
	}

	private Employee(Parcel in) {
		super();
		this.id = in.readInt();
		this.name = in.readString();
		this.dateOfBirth = new Date(in.readLong());
		this.salary = in.readDouble();
	}

	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 Date getDateOfBirth() {
		return dateOfBirth;
	}

	public void setDateOfBirth(Date dateOfBirth) {
		this.dateOfBirth = dateOfBirth;
	}

	public double getSalary() {
		return salary;
	}

	public void setSalary(double salary) {
		this.salary = salary;
	}

	@Override
	public String toString() {
		return "Employee [id=" + id + ", name=" + name + ", dateOfBirth="
				+ dateOfBirth + ", salary=" + salary + "]";
	}

	@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;
		Employee other = (Employee) obj;
		if (id != other.id)
			return false;
		return true;
	}

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

	@Override
	public void writeToParcel(Parcel parcel, int flags) {
		parcel.writeInt(getId());
		parcel.writeString(getName());
		parcel.writeLong(getDateOfBirth().getTime());
		parcel.writeDouble(getSalary());
	}

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

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

}

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package com.androidopentutorials.sqlite.to;

import java.util.Date;

import android.os.Parcel;

import android.os.Parcelable;

public class Employee implements Parcelable {

private int id;

private String name;

private Date dateOfBirth;

private double salary;

public Employee() {

super();

}

private Employee(Parcel in) {

super();

this.id = in.readInt();

this.name = in.readString();

this.dateOfBirth = new Date(in.readLong());

this.salary = in.readDouble();

}

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 Date getDateOfBirth() {

return dateOfBirth;

}

public void setDateOfBirth(Date dateOfBirth) {

this.dateOfBirth = dateOfBirth;

}

public double getSalary() {

return salary;

}

public void setSalary(double salary) {

this.salary = salary;

}

@Override

public String toString() {

return "Employee [id=" + id + ", name=" + name + ", dateOfBirth="

+ dateOfBirth + ", salary=" + salary + "]";

}

@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;

Employee other = (Employee) obj;

if (id != other.id)

return false;

return true;

}

@Override

public int describeContents() {

return 0;

}

@Override

public void writeToParcel(Parcel parcel, int flags) {

parcel.writeInt(getId());

parcel.writeString(getName());

parcel.writeLong(getDateOfBirth().getTime());

parcel.writeDouble(getSalary());

}

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

public Employee createFromParcel(Parcel in) {

return new Employee(in);

}

public Employee[] newArray(int size) {

return new Employee[size];

}

};

}

Save Employee

In src folder, create a new class EmployeeDAO in the package com.androidopentutorials.sqlite.db. This class extends EmployeeDBDAO and implements database operations such as retrieve, save, update, and delete employee object.

package com.androidopentutorials.sqlite.db;

import android.content.ContentValues;
import android.content.Context;
import java.text.SimpleDateFormat;
import java.util.Locale;

import com.androidopentutorials.sqlite.to.Employee;

public class EmployeeDAO extends EmployeeDBDAO {

        private static final SimpleDateFormat formatter = new SimpleDateFormat(
			"yyyy-MM-dd", Locale.ENGLISH);

	public EmployeeDAO(Context context) {
		super(context);
	}
         
        ...
	public long save(Employee employee) {
		ContentValues values = new ContentValues();
		values.put(DataBaseHelper.NAME_COLUMN, employee.getName());
		values.put(DataBaseHelper.EMPLOYEE_DOB, formatter.format(employee.getDateOfBirth()));
		values.put(DataBaseHelper.EMPLOYEE_SALARY, employee.getSalary());

		return database.insert(DataBaseHelper.EMPLOYEE_TABLE, null, values);
	}
        
        ....
}

package com.androidopentutorials.sqlite.db;

import android.content.ContentValues;

import android.content.Context;

import java.text.SimpleDateFormat;

import java.util.Locale;

import com.androidopentutorials.sqlite.to.Employee;

public class EmployeeDAO extends EmployeeDBDAO {

private static final SimpleDateFormat formatter = new SimpleDateFormat(

"yyyy-MM-dd", Locale.ENGLISH);

public EmployeeDAO(Context context) {

super(context);

}

...

public long save(Employee employee) {

ContentValues values = new ContentValues();

values.put(DataBaseHelper.NAME_COLUMN, employee.getName());

values.put(DataBaseHelper.EMPLOYEE_DOB, formatter.format(employee.getDateOfBirth()));

values.put(DataBaseHelper.EMPLOYEE_SALARY, employee.getSalary());

return database.insert(DataBaseHelper.EMPLOYEE_TABLE, null, values);

}

....

}

Here we are formatting ‘date of birth’ as ‘yyyy-MM-dd’ by using SimpleDateFormatter to be compatible with SQLite date type. To insert a new row in SQLite, we use ContentValues which define key-value pairs where key represents table column name and the value represents the data for the column for a particular record.

Add Employee Fragment

In src folder, create a new class EmpAddFragment in the package com.androidopentutorials.sqlite.fragment.

This fragment displays a form to enter employee details such as name, date of birth and salary. DatePickerDialog opens when date of birth EditText is clicked.
We execute a background task (AsyncTask) to save the employee record by calling save() method of EmployeeDAO class.

package com.androidopentutorials.sqlite.fragment;

import java.lang.ref.WeakReference;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.text.InputType;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.Toast;

import com.androidopentutorials.sqlite.R;
import com.androidopentutorials.sqlite.db.EmployeeDAO;
import com.androidopentutorials.sqlite.to.Employee;

public class EmpAddFragment extends Fragment implements OnClickListener {

	// UI references
	private EditText empNameEtxt;
	private EditText empSalaryEtxt;
	private EditText empDobEtxt;
	private Button addButton;
	private Button resetButton;

	private static final SimpleDateFormat formatter = new SimpleDateFormat(
			"yyyy-MM-dd", Locale.ENGLISH);

	DatePickerDialog datePickerDialog;
	Calendar dateCalendar;

	Employee employee = null;
	private EmployeeDAO employeeDAO;
	private AddEmpTask task;

	public static final String ARG_ITEM_ID = "emp_add_fragment";

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

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

		findViewsById(rootView);

		setListeners();

		//For orientation change. 
		if (savedInstanceState != null) {
			dateCalendar = Calendar.getInstance();
			if (savedInstanceState.getLong("dateCalendar") != 0)
				dateCalendar.setTime(new Date(savedInstanceState
						.getLong("dateCalendar")));
		}

		return rootView;
	}

	private void setListeners() {
		empDobEtxt.setOnClickListener(this);
		Calendar newCalendar = Calendar.getInstance();
		datePickerDialog = new DatePickerDialog(getActivity(),
				new OnDateSetListener() {

					public void onDateSet(DatePicker view, int year,
							int monthOfYear, int dayOfMonth) {
						dateCalendar = Calendar.getInstance();
						dateCalendar.set(year, monthOfYear, dayOfMonth);
						empDobEtxt.setText(formatter.format(dateCalendar
								.getTime()));
					}

				}, newCalendar.get(Calendar.YEAR),
				newCalendar.get(Calendar.MONTH),
				newCalendar.get(Calendar.DAY_OF_MONTH));

		addButton.setOnClickListener(this);
		resetButton.setOnClickListener(this);
	}

	protected void resetAllFields() {
		empNameEtxt.setText("");
		empSalaryEtxt.setText("");
		empDobEtxt.setText("");
	}

	private void setEmployee() {
		employee = new Employee();
		employee.setName(empNameEtxt.getText().toString());
		employee.setSalary(Double.parseDouble(empSalaryEtxt.getText()
				.toString()));
		if (dateCalendar != null)
			employee.setDateOfBirth(dateCalendar.getTime());
	}

	@Override
	public void onResume() {
		getActivity().setTitle(R.string.add_emp);
		getActivity().getActionBar().setTitle(R.string.add_emp);
		super.onResume();
	}

	@Override
	public void onSaveInstanceState(Bundle outState) {
		if (dateCalendar != null)
			outState.putLong("dateCalendar", dateCalendar.getTime().getTime());
	}

	private void findViewsById(View rootView) {
		empNameEtxt = (EditText) rootView.findViewById(R.id.etxt_name);
		empSalaryEtxt = (EditText) rootView.findViewById(R.id.etxt_salary);
		empDobEtxt = (EditText) rootView.findViewById(R.id.etxt_dob);
		empDobEtxt.setInputType(InputType.TYPE_NULL);

		addButton = (Button) rootView.findViewById(R.id.button_add);
		resetButton = (Button) rootView.findViewById(R.id.button_reset);
	}

	@Override
	public void onClick(View view) {
		if (view == empDobEtxt) {
			datePickerDialog.show();
		} else if (view == addButton) {
			setEmployee();

			task = new AddEmpTask(getActivity());
			task.execute((Void) null);
		} else if (view == resetButton) {
			resetAllFields();
		}
	}

	public class AddEmpTask extends AsyncTask<Void, Void, Long> {

		private final WeakReference<Activity> activityWeakRef;

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

		@Override
		protected Long doInBackground(Void... arg0) {
			long result = employeeDAO.save(employee);
			return result;
		}

		@Override
		protected void onPostExecute(Long result) {
			if (activityWeakRef.get() != null
					&& !activityWeakRef.get().isFinishing()) {
				if (result != -1)
					Toast.makeText(activityWeakRef.get(), "Employee Saved",
							Toast.LENGTH_LONG).show();
			}
		}
	}
}

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package com.androidopentutorials.sqlite.fragment;

import java.lang.ref.WeakReference;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.Locale;

import android.app.Activity;

import android.app.DatePickerDialog;

import android.app.DatePickerDialog.OnDateSetListener;

import android.os.AsyncTask;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.text.InputType;

import android.view.LayoutInflater;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.DatePicker;

import android.widget.EditText;

import android.widget.Toast;

import com.androidopentutorials.sqlite.R;

import com.androidopentutorials.sqlite.db.EmployeeDAO;

import com.androidopentutorials.sqlite.to.Employee;

public class EmpAddFragment extends Fragment implements OnClickListener {

// UI references

private EditText empNameEtxt;

private EditText empSalaryEtxt;

private EditText empDobEtxt;

private Button addButton;

private Button resetButton;

private static final SimpleDateFormat formatter = new SimpleDateFormat(

"yyyy-MM-dd", Locale.ENGLISH);

DatePickerDialog datePickerDialog;

Calendar dateCalendar;

Employee employee = null;

private EmployeeDAO employeeDAO;

private AddEmpTask task;

public static final String ARG_ITEM_ID = "emp_add_fragment";

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

employeeDAO = new EmployeeDAO(getActivity());

}

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

View rootView = inflater.inflate(R.layout.fragment_add_emp, container,

false);

findViewsById(rootView);

setListeners();

//For orientation change.

if (savedInstanceState != null) {

dateCalendar = Calendar.getInstance();

if (savedInstanceState.getLong("dateCalendar") != 0)

dateCalendar.setTime(new Date(savedInstanceState

.getLong("dateCalendar")));

}

return rootView;

}

private void setListeners() {

empDobEtxt.setOnClickListener(this);

Calendar newCalendar = Calendar.getInstance();

datePickerDialog = new DatePickerDialog(getActivity(),

new OnDateSetListener() {

public void onDateSet(DatePicker view, int year,

int monthOfYear, int dayOfMonth) {

dateCalendar = Calendar.getInstance();

dateCalendar.set(year, monthOfYear, dayOfMonth);

empDobEtxt.setText(formatter.format(dateCalendar

.getTime()));

}

}, newCalendar.get(Calendar.YEAR),

newCalendar.get(Calendar.MONTH),

newCalendar.get(Calendar.DAY_OF_MONTH));

addButton.setOnClickListener(this);

resetButton.setOnClickListener(this);

}

protected void resetAllFields() {

empNameEtxt.setText("");

empSalaryEtxt.setText("");

empDobEtxt.setText("");

}

private void setEmployee() {

employee = new Employee();

employee.setName(empNameEtxt.getText().toString());

employee.setSalary(Double.parseDouble(empSalaryEtxt.getText()

.toString()));

if (dateCalendar != null)

employee.setDateOfBirth(dateCalendar.getTime());

}

@Override

public void onResume() {

getActivity().setTitle(R.string.add_emp);

getActivity().getActionBar().setTitle(R.string.add_emp);

super.onResume();

}

@Override

public void onSaveInstanceState(Bundle outState) {

if (dateCalendar != null)

outState.putLong("dateCalendar", dateCalendar.getTime().getTime());

}

private void findViewsById(View rootView) {

empNameEtxt = (EditText) rootView.findViewById(R.id.etxt_name);

empSalaryEtxt = (EditText) rootView.findViewById(R.id.etxt_salary);

empDobEtxt = (EditText) rootView.findViewById(R.id.etxt_dob);

empDobEtxt.setInputType(InputType.TYPE_NULL);

addButton = (Button) rootView.findViewById(R.id.button_add);

resetButton = (Button) rootView.findViewById(R.id.button_reset);

}

@Override

public void onClick(View view) {

if (view == empDobEtxt) {

datePickerDialog.show();

} else if (view == addButton) {

setEmployee();

task = new AddEmpTask(getActivity());

task.execute((Void) null);

} else if (view == resetButton) {

resetAllFields();

}

public class AddEmpTask extends AsyncTask<Void, Void, Long> {

private final WeakReference<Activity> activityWeakRef;

public AddEmpTask(Activity context) {

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

}

@Override

protected Long doInBackground(Void... arg0) {

long result = employeeDAO.save(employee);

return result;

}

@Override

protected void onPostExecute(Long result) {

if (activityWeakRef.get() != null

&& !activityWeakRef.get().isFinishing()) {

if (result != -1)

Toast.makeText(activityWeakRef.get(), "Employee Saved",

Toast.LENGTH_LONG).show();

}

Fetch records from SQLite database

EmployeeDAO class

In the above mentioned EmployeeDAO class, add the below getEmployees() method to get all records from database. This class uses query method which accepts the following parameters and returns a Cursor over the result set,

public Cursor query (String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy)

package com.androidopentutorials.sqlite.db;

import java.util.ArrayList;
import java.util.Date;
import android.content.Context;
import android.database.Cursor;

import com.androidopentutorials.sqlite.to.Employee;

public class EmployeeDAO extends EmployeeDBDAO {

        ...
	public ArrayList<Employee> getEmployees() {
		ArrayList<Employee> employees = new ArrayList<Employee>();

		Cursor cursor = database.query(DataBaseHelper.EMPLOYEE_TABLE,
				new String[] { DataBaseHelper.ID_COLUMN,
						DataBaseHelper.NAME_COLUMN,
						DataBaseHelper.EMPLOYEE_DOB,
						DataBaseHelper.EMPLOYEE_SALARY }, null, null, null,
				null, null);

		while (cursor.moveToNext()) {
			Employee employee = new Employee();
			employee.setId(cursor.getInt(0));
			employee.setName(cursor.getString(1));
			try {
				employee.setDateOfBirth(formatter.parse(cursor.getString(2)));
			} catch (ParseException e) {
				employee.setDateOfBirth(null);
			}
			employee.setSalary(cursor.getDouble(3));

			employees.add(employee);
		}
		return employees;
	}
        ...
}

package com.androidopentutorials.sqlite.db;

import java.util.ArrayList;

import java.util.Date;

import android.content.Context;

import android.database.Cursor;

import com.androidopentutorials.sqlite.to.Employee;

public class EmployeeDAO extends EmployeeDBDAO {

...

public ArrayList<Employee> getEmployees() {

ArrayList<Employee> employees = new ArrayList<Employee>();

Cursor cursor = database.query(DataBaseHelper.EMPLOYEE_TABLE,

new String[] { DataBaseHelper.ID_COLUMN,

DataBaseHelper.NAME_COLUMN,

DataBaseHelper.EMPLOYEE_DOB,

DataBaseHelper.EMPLOYEE_SALARY }, null, null, null,

null, null);

while (cursor.moveToNext()) {

Employee employee = new Employee();

employee.setId(cursor.getInt(0));

employee.setName(cursor.getString(1));

try {

employee.setDateOfBirth(formatter.parse(cursor.getString(2)));

} catch (ParseException e) {

employee.setDateOfBirth(null);

}

employee.setSalary(cursor.getDouble(3));

employees.add(employee);

}

return employees;

}

...

}

Employee List Adapter

In src folder, create a new class EmpListAdapter in the package com.androidopentutorials.sqlite.adapter. This is the custom list adapter class which displays employee details – id, name, date of birth and salary.

package com.androidopentutorials.sqlite.adapter;

import java.text.SimpleDateFormat;
import java.util.List;
import java.util.Locale;

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import com.androidopentutorials.sqlite.R;
import com.androidopentutorials.sqlite.to.Employee;

public class EmpListAdapter extends ArrayAdapter<Employee> {

	private Context context;
	List<Employee> employees;

	private static final SimpleDateFormat formatter = new SimpleDateFormat(
			"yyyy-MM-dd", Locale.ENGLISH);

	public EmpListAdapter(Context context, List<Employee> employees) {
		super(context, R.layout.list_item, employees);
		this.context = context;
		this.employees = employees;
	}

	private class ViewHolder {
		TextView empIdTxt;
		TextView empNameTxt;
		TextView empDobTxt;
		TextView empSalaryTxt;
	}

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

	@Override
	public Employee getItem(int position) {
		return employees.get(position);
	}

	@Override
	public long getItemId(int position) {
		return 0;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ViewHolder holder = null;
		if (convertView == null) {
			LayoutInflater inflater = (LayoutInflater) context
					.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
			convertView = inflater.inflate(R.layout.list_item, null);
			holder = new ViewHolder();

			holder.empIdTxt = (TextView) convertView
					.findViewById(R.id.txt_emp_id);
			holder.empNameTxt = (TextView) convertView
					.findViewById(R.id.txt_emp_name);
			holder.empDobTxt = (TextView) convertView
					.findViewById(R.id.txt_emp_dob);
			holder.empSalaryTxt = (TextView) convertView
					.findViewById(R.id.txt_emp_salary);

			convertView.setTag(holder);
		} else {
			holder = (ViewHolder) convertView.getTag();
		}
		Employee employee = (Employee) getItem(position);
		holder.empIdTxt.setText(employee.getId() + "");
		holder.empNameTxt.setText(employee.getName());
		holder.empSalaryTxt.setText(employee.getSalary() + "");

		holder.empDobTxt.setText(formatter.format(employee.getDateOfBirth()));

		return convertView;
	}

	@Override
	public void add(Employee employee) {
		employees.add(employee);
		notifyDataSetChanged();
		super.add(employee);
	}

	@Override
	public void remove(Employee employee) {
		employees.remove(employee);
		notifyDataSetChanged();
		super.remove(employee);
	}
}

package com.androidopentutorials.sqlite.adapter;

import java.text.SimpleDateFormat;

import java.util.List;

import java.util.Locale;

import android.app.Activity;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ArrayAdapter;

import android.widget.TextView;

import com.androidopentutorials.sqlite.R;

import com.androidopentutorials.sqlite.to.Employee;

public class EmpListAdapter extends ArrayAdapter<Employee> {

private Context context;

List<Employee> employees;

private static final SimpleDateFormat formatter = new SimpleDateFormat(

"yyyy-MM-dd", Locale.ENGLISH);

public EmpListAdapter(Context context, List<Employee> employees) {

super(context, R.layout.list_item, employees);

this.context = context;

this.employees = employees;

}

private class ViewHolder {

TextView empIdTxt;

TextView empNameTxt;

TextView empDobTxt;

TextView empSalaryTxt;

}

@Override

public int getCount() {

return employees.size();

}

@Override

public Employee getItem(int position) {

return employees.get(position);

}

@Override

public long getItemId(int position) {

return 0;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

ViewHolder holder = null;

if (convertView == null) {

LayoutInflater inflater = (LayoutInflater) context

.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);

convertView = inflater.inflate(R.layout.list_item, null);

holder = new ViewHolder();

holder.empIdTxt = (TextView) convertView

.findViewById(R.id.txt_emp_id);

holder.empNameTxt = (TextView) convertView

.findViewById(R.id.txt_emp_name);

holder.empDobTxt = (TextView) convertView

.findViewById(R.id.txt_emp_dob);

holder.empSalaryTxt = (TextView) convertView

.findViewById(R.id.txt_emp_salary);

convertView.setTag(holder);

} else {

holder = (ViewHolder) convertView.getTag();

}

Employee employee = (Employee) getItem(position);

holder.empIdTxt.setText(employee.getId() + "");

holder.empNameTxt.setText(employee.getName());

holder.empSalaryTxt.setText(employee.getSalary() + "");

holder.empDobTxt.setText(formatter.format(employee.getDateOfBirth()));

return convertView;

}

@Override

public void add(Employee employee) {

employees.add(employee);

notifyDataSetChanged();

super.add(employee);

}

@Override

public void remove(Employee employee) {

employees.remove(employee);

notifyDataSetChanged();

super.remove(employee);

}

The add() and remove() method adds and removes item from ListView and notifies the Listview adapter.

Display Database Records in ListView – Employee List Fragment

In src folder, create a new class EmpListFragment in the package com.androidopentutorials.sqlite.fragment.

This fragment class executes a background task (AsyncTask) where we call getEmployees() method in EmployeeDAO and display list of employees in a ListView.
When a list item is clicked we display a custom dialog fragment to update employee details.
On list item long click event we delete a particular employee record from the database and remove it from the list adapter.

package com.androidopentutorials.sqlite.fragment;

import java.lang.ref.WeakReference;
import java.util.ArrayList;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ListView;
import android.widget.Toast;

import com.androidopentutorials.sqlite.R;
import com.androidopentutorials.sqlite.adapter.EmpListAdapter;
import com.androidopentutorials.sqlite.db.EmployeeDAO;
import com.androidopentutorials.sqlite.to.Employee;

public class EmpListFragment extends Fragment implements OnItemClickListener,
		OnItemLongClickListener {

	public static final String ARG_ITEM_ID = "employee_list";

	Activity activity;
	ListView employeeListView;
	ArrayList<Employee> employees;

	EmpListAdapter employeeListAdapter;
	EmployeeDAO employeeDAO;

	private GetEmpTask task;

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

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

		task = new GetEmpTask(activity);
		task.execute((Void) null);

		employeeListView.setOnItemClickListener(this);
		employeeListView.setOnItemLongClickListener(this);
		// Employee e = employeeDAO.getEmployee(1);
		// Log.d("employee e", e.toString());
		return view;
	}

	private void findViewsById(View view) {
		employeeListView = (ListView) view.findViewById(R.id.list_emp);
	}

	@Override
	public void onResume() {
		getActivity().setTitle(R.string.app_name);
		getActivity().getActionBar().setTitle(R.string.app_name);
		super.onResume();
	}

	@Override
	public void onItemClick(AdapterView<?> list, View arg1, int position,
			long arg3) {
		Employee employee = (Employee) list.getItemAtPosition(position);

		if (employee != null) {
			Bundle arguments = new Bundle();
			arguments.putParcelable("selectedEmployee", employee);
			CustomEmpDialogFragment customEmpDialogFragment = new CustomEmpDialogFragment();
			customEmpDialogFragment.setArguments(arguments);
			customEmpDialogFragment.show(getFragmentManager(),
					CustomEmpDialogFragment.ARG_ITEM_ID);
		}
	}

	@Override
	public boolean onItemLongClick(AdapterView<?> parent, View view,
			int position, long arg3) {
		Employee employee = (Employee) parent.getItemAtPosition(position);

		// Use AsyncTask to delete from database
		employeeDAO.delete(employee);
		employeeListAdapter.remove(employee);
		return true;
	}

	public class GetEmpTask extends AsyncTask<Void, Void, ArrayList<Employee>> {

		private final WeakReference<Activity> activityWeakRef;

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

		@Override
		protected ArrayList<Employee> doInBackground(Void... arg0) {
			ArrayList<Employee> employeeList = employeeDAO.getEmployees();
			return employeeList;
		}

		@Override
		protected void onPostExecute(ArrayList<Employee> empList) {
			if (activityWeakRef.get() != null
					&& !activityWeakRef.get().isFinishing()) {
				Log.d("employees", empList.toString());
				employees = empList;
				if (empList != null) {
					if (empList.size() != 0) {
						employeeListAdapter = new EmpListAdapter(activity,
								empList);
						employeeListView.setAdapter(employeeListAdapter);
					} else {
						Toast.makeText(activity, "No Employee Records",
								Toast.LENGTH_LONG).show();
					}
				}

			}
		}
	}

	/*
	 * This method is invoked from MainActivity onFinishDialog() method. It is
	 * called from CustomEmpDialogFragment when an employee record is updated.
	 * This is used for communicating between fragments.
	 */
	public void updateView() {
		task = new GetEmpTask(activity);
		task.execute((Void) null);
	}
}

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package com.androidopentutorials.sqlite.fragment;

import java.lang.ref.WeakReference;

import java.util.ArrayList;

import android.app.Activity;

import android.os.AsyncTask;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.AdapterView.OnItemLongClickListener;

import android.widget.ListView;

import android.widget.Toast;

import com.androidopentutorials.sqlite.R;

import com.androidopentutorials.sqlite.adapter.EmpListAdapter;

import com.androidopentutorials.sqlite.db.EmployeeDAO;

import com.androidopentutorials.sqlite.to.Employee;

public class EmpListFragment extends Fragment implements OnItemClickListener,

OnItemLongClickListener {

public static final String ARG_ITEM_ID = "employee_list";

Activity activity;

ListView employeeListView;

ArrayList<Employee> employees;

EmpListAdapter employeeListAdapter;

EmployeeDAO employeeDAO;

private GetEmpTask task;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

activity = getActivity();

employeeDAO = new EmployeeDAO(activity);

}

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

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

false);

findViewsById(view);

task = new GetEmpTask(activity);

task.execute((Void) null);

employeeListView.setOnItemClickListener(this);

employeeListView.setOnItemLongClickListener(this);

// Employee e = employeeDAO.getEmployee(1);

// Log.d("employee e", e.toString());

return view;

}

private void findViewsById(View view) {

employeeListView = (ListView) view.findViewById(R.id.list_emp);

}

@Override

public void onResume() {

getActivity().setTitle(R.string.app_name);

getActivity().getActionBar().setTitle(R.string.app_name);

super.onResume();

}

@Override

public void onItemClick(AdapterView<?> list, View arg1, int position,

long arg3) {

Employee employee = (Employee) list.getItemAtPosition(position);

if (employee != null) {

Bundle arguments = new Bundle();

arguments.putParcelable("selectedEmployee", employee);

CustomEmpDialogFragment customEmpDialogFragment = new CustomEmpDialogFragment();

customEmpDialogFragment.setArguments(arguments);

customEmpDialogFragment.show(getFragmentManager(),

CustomEmpDialogFragment.ARG_ITEM_ID);

}

@Override

public boolean onItemLongClick(AdapterView<?> parent, View view,

int position, long arg3) {

Employee employee = (Employee) parent.getItemAtPosition(position);

// Use AsyncTask to delete from database

employeeDAO.delete(employee);

employeeListAdapter.remove(employee);

return true;

}

public class GetEmpTask extends AsyncTask<Void, Void, ArrayList<Employee>> {

private final WeakReference<Activity> activityWeakRef;

public GetEmpTask(Activity context) {

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

}

@Override

protected ArrayList<Employee> doInBackground(Void... arg0) {

ArrayList<Employee> employeeList = employeeDAO.getEmployees();

return employeeList;

}

@Override

protected void onPostExecute(ArrayList<Employee> empList) {

if (activityWeakRef.get() != null

&& !activityWeakRef.get().isFinishing()) {

Log.d("employees", empList.toString());

employees = empList;

if (empList != null) {

if (empList.size() != 0) {

employeeListAdapter = new EmpListAdapter(activity,

empList);

employeeListView.setAdapter(employeeListAdapter);

} else {

Toast.makeText(activity, "No Employee Records",

Toast.LENGTH_LONG).show();

}

* This method is invoked from MainActivity onFinishDialog() method. It is

* called from CustomEmpDialogFragment when an employee record is updated.

* This is used for communicating between fragments.

public void updateView() {

task = new GetEmpTask(activity);

task.execute((Void) null);

}

Update a row in SQLite database

EmployeeDAO class

In the above mentioned EmployeeDAO class, add the following method to update a particular record from database.

package com.androidopentutorials.sqlite.db;

import android.content.ContentValues;
import android.content.Context;
import android.util.Log;

import com.androidopentutorials.sqlite.to.Employee;

public class EmployeeDAO extends EmployeeDBDAO {

	private static final String WHERE_ID_EQUALS = DataBaseHelper.ID_COLUMN
			+ " =?";
        private static final SimpleDateFormat formatter = new SimpleDateFormat(
			"yyyy-MM-dd", Locale.ENGLISH);
        ...
	public long update(Employee employee) {
		ContentValues values = new ContentValues();
		values.put(DataBaseHelper.NAME_COLUMN, employee.getName());
		values.put(DataBaseHelper.EMPLOYEE_DOB, formatter.format(employee.getDateOfBirth()));
		values.put(DataBaseHelper.EMPLOYEE_SALARY, employee.getSalary());

		long result = database.update(DataBaseHelper.EMPLOYEE_TABLE, values,
				WHERE_ID_EQUALS,
				new String[] { String.valueOf(employee.getId()) });
		Log.d("Update Result:", "=" + result);
		return result;

	}
        ...
}

package com.androidopentutorials.sqlite.db;

import android.content.ContentValues;

import android.content.Context;

import android.util.Log;

import com.androidopentutorials.sqlite.to.Employee;

public class EmployeeDAO extends EmployeeDBDAO {

private static final String WHERE_ID_EQUALS = DataBaseHelper.ID_COLUMN

+ " =?";

private static final SimpleDateFormat formatter = new SimpleDateFormat(

"yyyy-MM-dd", Locale.ENGLISH);

...

public long update(Employee employee) {

ContentValues values = new ContentValues();

values.put(DataBaseHelper.NAME_COLUMN, employee.getName());

values.put(DataBaseHelper.EMPLOYEE_DOB, formatter.format(employee.getDateOfBirth()));

values.put(DataBaseHelper.EMPLOYEE_SALARY, employee.getSalary());

long result = database.update(DataBaseHelper.EMPLOYEE_TABLE, values,

WHERE_ID_EQUALS,

new String[] { String.valueOf(employee.getId()) });

Log.d("Update Result:", "=" + result);

return result;

}

...

}

CustomEmpDialogFragment class

In src folder, create a new class CustomEmpDialogFragment in the package com.androidopentutorials.sqlite.fragment.

This class receives an employee object in bundle as an argument and displays a dialog with employee details (name, salary, dob) and updates employee details.
If the update is successful, it calls onFinishDialog() on MainActivity to notify the ListView (EmpListFragment). All communication between fragments should go via their activity class.

package com.androidopentutorials.sqlite.fragment;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Locale;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;

import com.androidopentutorials.sqlite.MainActivity;
import com.androidopentutorials.sqlite.R;
import com.androidopentutorials.sqlite.db.EmployeeDAO;
import com.androidopentutorials.sqlite.to.Employee;

public class CustomEmpDialogFragment extends DialogFragment {

	// UI references
	private EditText empNameEtxt;
	private EditText empSalaryEtxt;
	private EditText empDobEtxt;
	private LinearLayout submitLayout;

	private Employee employee;

	private static final SimpleDateFormat formatter = new SimpleDateFormat(
			"yyyy-MM-dd", Locale.ENGLISH);
	
	EmployeeDAO employeeDAO;
	
	public static final String ARG_ITEM_ID = "emp_dialog_fragment";

	public interface EmpDialogFragmentListener {
		void onFinishDialog();
	}

	public CustomEmpDialogFragment() {

	}

	@Override
	public Dialog onCreateDialog(Bundle savedInstanceState) {
		employeeDAO = new EmployeeDAO(getActivity());

		Bundle bundle = this.getArguments();
		employee = bundle.getParcelable("selectedEmployee");

		AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
		LayoutInflater inflater = getActivity().getLayoutInflater();

		View customDialogView = inflater.inflate(R.layout.fragment_add_emp,
				null);
		builder.setView(customDialogView);

		empNameEtxt = (EditText) customDialogView.findViewById(R.id.etxt_name);
		empSalaryEtxt = (EditText) customDialogView
				.findViewById(R.id.etxt_salary);
		empDobEtxt = (EditText) customDialogView.findViewById(R.id.etxt_dob);
		submitLayout = (LinearLayout) customDialogView
				.findViewById(R.id.layout_submit);
		submitLayout.setVisibility(View.GONE);

		setValue();

		builder.setTitle(R.string.update_emp);
		builder.setCancelable(false);
		builder.setPositiveButton(R.string.update,
				new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int id) {
						try {
							employee.setDateOfBirth(formatter.parse(empDobEtxt.getText().toString()));
						} catch (ParseException e) {
							Toast.makeText(getActivity(),
									"Invalid date format!",
									Toast.LENGTH_SHORT).show();
							return;
						}
						employee.setName(empNameEtxt.getText().toString());
						employee.setSalary(Double.parseDouble(empSalaryEtxt
								.getText().toString()));
						long result = employeeDAO.update(employee);
						if (result > 0) {
							MainActivity activity = (MainActivity) getActivity();
							activity.onFinishDialog();
						} else {
							Toast.makeText(getActivity(),
									"Unable to update employee",
									Toast.LENGTH_SHORT).show();
						}
					}
				});
		builder.setNegativeButton(R.string.cancel,
				new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int id) {
						dialog.cancel();
					}
				});

		AlertDialog alertDialog = builder.create();

		return alertDialog;
	}

	private void setValue() {
		if (employee != null) {
			empNameEtxt.setText(employee.getName());
			empSalaryEtxt.setText(employee.getSalary() + "");
			empDobEtxt.setText(formatter.format(employee.getDateOfBirth()));
		}
	}
}

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package com.androidopentutorials.sqlite.fragment;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Locale;

import android.app.AlertDialog;

import android.app.Dialog;

import android.content.DialogInterface;

import android.os.Bundle;

import android.support.v4.app.DialogFragment;

import android.view.LayoutInflater;

import android.view.View;

import android.widget.EditText;

import android.widget.LinearLayout;

import android.widget.Toast;

import com.androidopentutorials.sqlite.MainActivity;

import com.androidopentutorials.sqlite.R;

import com.androidopentutorials.sqlite.db.EmployeeDAO;

import com.androidopentutorials.sqlite.to.Employee;

public class CustomEmpDialogFragment extends DialogFragment {

// UI references

private EditText empNameEtxt;

private EditText empSalaryEtxt;

private EditText empDobEtxt;

private LinearLayout submitLayout;

private Employee employee;

private static final SimpleDateFormat formatter = new SimpleDateFormat(

"yyyy-MM-dd", Locale.ENGLISH);

EmployeeDAO employeeDAO;

public static final String ARG_ITEM_ID = "emp_dialog_fragment";

public interface EmpDialogFragmentListener {

void onFinishDialog();

}

public CustomEmpDialogFragment() {

}

@Override

public Dialog onCreateDialog(Bundle savedInstanceState) {

employeeDAO = new EmployeeDAO(getActivity());

Bundle bundle = this.getArguments();

employee = bundle.getParcelable("selectedEmployee");

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

LayoutInflater inflater = getActivity().getLayoutInflater();

View customDialogView = inflater.inflate(R.layout.fragment_add_emp,

null);

builder.setView(customDialogView);

empNameEtxt = (EditText) customDialogView.findViewById(R.id.etxt_name);

empSalaryEtxt = (EditText) customDialogView

.findViewById(R.id.etxt_salary);

empDobEtxt = (EditText) customDialogView.findViewById(R.id.etxt_dob);

submitLayout = (LinearLayout) customDialogView

.findViewById(R.id.layout_submit);

submitLayout.setVisibility(View.GONE);

setValue();

builder.setTitle(R.string.update_emp);

builder.setCancelable(false);

builder.setPositiveButton(R.string.update,

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int id) {

try {

employee.setDateOfBirth(formatter.parse(empDobEtxt.getText().toString()));

} catch (ParseException e) {

Toast.makeText(getActivity(),

"Invalid date format!",

Toast.LENGTH_SHORT).show();

return;

}

employee.setName(empNameEtxt.getText().toString());

employee.setSalary(Double.parseDouble(empSalaryEtxt

.getText().toString()));

long result = employeeDAO.update(employee);

if (result > 0) {

MainActivity activity = (MainActivity) getActivity();

activity.onFinishDialog();

} else {

Toast.makeText(getActivity(),

"Unable to update employee",

Toast.LENGTH_SHORT).show();

}

});

builder.setNegativeButton(R.string.cancel,

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int id) {

dialog.cancel();

}

});

AlertDialog alertDialog = builder.create();

return alertDialog;

}

private void setValue() {

if (employee != null) {

empNameEtxt.setText(employee.getName());

empSalaryEtxt.setText(employee.getSalary() + "");

empDobEtxt.setText(formatter.format(employee.getDateOfBirth()));

}

Delete a row from SQLite database

EmployeeDAO class

In the above mentioned EmployeeDAO class, add the following method to delete a particular record from database.

package com.androidopentutorials.sqlite.db;

import android.content.Context;
import com.androidopentutorials.sqlite.to.Employee;

public class EmployeeDAO extends EmployeeDBDAO {
        ...
	public int delete(Employee employee) {
		return database.delete(DataBaseHelper.EMPLOYEE_TABLE, WHERE_ID_EQUALS,
				new String[] { employee.getId() + "" });
	}
        ...
}

package com.androidopentutorials.sqlite.db;

import android.content.Context;

import com.androidopentutorials.sqlite.to.Employee;

public class EmployeeDAO extends EmployeeDBDAO {

...

public int delete(Employee employee) {

return database.delete(DataBaseHelper.EMPLOYEE_TABLE, WHERE_ID_EQUALS,

new String[] { employee.getId() + "" });

}

...

}

EmpListFragment calls this delete() method on list item long click event.

Complete EmployeeDAO class

package com.androidopentutorials.sqlite.db;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Locale;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.util.Log;

import com.androidopentutorials.sqlite.to.Employee;

public class EmployeeDAO extends EmployeeDBDAO {

	private static final String WHERE_ID_EQUALS = DataBaseHelper.ID_COLUMN
			+ " =?";
	private static final SimpleDateFormat formatter = new SimpleDateFormat(
			"yyyy-MM-dd", Locale.ENGLISH);

	public EmployeeDAO(Context context) {
		super(context);
	}

	public long save(Employee employee) {
		ContentValues values = new ContentValues();
		values.put(DataBaseHelper.NAME_COLUMN, employee.getName());
		Log.d("dob", employee.getDateOfBirth().getTime() + "");
		values.put(DataBaseHelper.EMPLOYEE_DOB, formatter.format(employee.getDateOfBirth()));
		values.put(DataBaseHelper.EMPLOYEE_SALARY, employee.getSalary());

		return database.insert(DataBaseHelper.EMPLOYEE_TABLE, null, values);
	}

	public long update(Employee employee) {
		ContentValues values = new ContentValues();
		values.put(DataBaseHelper.NAME_COLUMN, employee.getName());
		values.put(DataBaseHelper.EMPLOYEE_DOB, formatter.format(employee.getDateOfBirth()));
		values.put(DataBaseHelper.EMPLOYEE_SALARY, employee.getSalary());

		long result = database.update(DataBaseHelper.EMPLOYEE_TABLE, values,
				WHERE_ID_EQUALS,
				new String[] { String.valueOf(employee.getId()) });
		Log.d("Update Result:", "=" + result);
		return result;

	}

	public int delete(Employee employee) {
		return database.delete(DataBaseHelper.EMPLOYEE_TABLE, WHERE_ID_EQUALS,
				new String[] { employee.getId() + "" });
	}

	//USING query() method
	public ArrayList<Employee> getEmployees() {
		ArrayList<Employee> employees = new ArrayList<Employee>();

		Cursor cursor = database.query(DataBaseHelper.EMPLOYEE_TABLE,
				new String[] { DataBaseHelper.ID_COLUMN,
						DataBaseHelper.NAME_COLUMN,
						DataBaseHelper.EMPLOYEE_DOB,
						DataBaseHelper.EMPLOYEE_SALARY }, null, null, null,
				null, null);

		while (cursor.moveToNext()) {
			Employee employee = new Employee();
			employee.setId(cursor.getInt(0));
			employee.setName(cursor.getString(1));
			try {
				employee.setDateOfBirth(formatter.parse(cursor.getString(2)));
			} catch (ParseException e) {
				employee.setDateOfBirth(null);
			}
			employee.setSalary(cursor.getDouble(3));

			employees.add(employee);
		}
		return employees;
	}
	
	//USING rawQuery() method
	/*public ArrayList<Employee> getEmployees() {
		ArrayList<Employee> employees = new ArrayList<Employee>();

		String sql = "SELECT " + DataBaseHelper.ID_COLUMN + ","
				+ DataBaseHelper.NAME_COLUMN + ","
				+ DataBaseHelper.EMPLOYEE_DOB + ","
				+ DataBaseHelper.EMPLOYEE_SALARY + " FROM "
				+ DataBaseHelper.EMPLOYEE_TABLE;

		Cursor cursor = database.rawQuery(sql, null);

		while (cursor.moveToNext()) {
			Employee employee = new Employee();
			employee.setId(cursor.getInt(0));
			employee.setName(cursor.getString(1));
			try {
				employee.setDateOfBirth(formatter.parse(cursor.getString(2)));
			} catch (ParseException e) {
				employee.setDateOfBirth(null);
			}
			employee.setSalary(cursor.getDouble(3));

			employees.add(employee);
		}
		return employees;
	}*/
	
	//Retrieves a single employee record with the given id
	public Employee getEmployee(long id) {
		Employee employee = null;

		String sql = "SELECT * FROM " + DataBaseHelper.EMPLOYEE_TABLE
				+ " WHERE " + DataBaseHelper.ID_COLUMN + " = ?";

		Cursor cursor = database.rawQuery(sql, new String[] { id + "" });

		if (cursor.moveToNext()) {
			employee = new Employee();
			employee.setId(cursor.getInt(0));
			employee.setName(cursor.getString(1));
			try {
				employee.setDateOfBirth(formatter.parse(cursor.getString(2)));
			} catch (ParseException e) {
				employee.setDateOfBirth(null);
			}
			employee.setSalary(cursor.getDouble(3));
		}
		return employee;
	}
}

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package com.androidopentutorials.sqlite.db;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Locale;

import android.content.ContentValues;

import android.content.Context;

import android.database.Cursor;

import android.util.Log;

import com.androidopentutorials.sqlite.to.Employee;

public class EmployeeDAO extends EmployeeDBDAO {

private static final String WHERE_ID_EQUALS = DataBaseHelper.ID_COLUMN

+ " =?";

private static final SimpleDateFormat formatter = new SimpleDateFormat(

"yyyy-MM-dd", Locale.ENGLISH);

public EmployeeDAO(Context context) {

super(context);

}

public long save(Employee employee) {

ContentValues values = new ContentValues();

values.put(DataBaseHelper.NAME_COLUMN, employee.getName());

Log.d("dob", employee.getDateOfBirth().getTime() + "");

values.put(DataBaseHelper.EMPLOYEE_DOB, formatter.format(employee.getDateOfBirth()));

values.put(DataBaseHelper.EMPLOYEE_SALARY, employee.getSalary());

return database.insert(DataBaseHelper.EMPLOYEE_TABLE, null, values);

}

public long update(Employee employee) {

ContentValues values = new ContentValues();

values.put(DataBaseHelper.NAME_COLUMN, employee.getName());

values.put(DataBaseHelper.EMPLOYEE_DOB, formatter.format(employee.getDateOfBirth()));

values.put(DataBaseHelper.EMPLOYEE_SALARY, employee.getSalary());

long result = database.update(DataBaseHelper.EMPLOYEE_TABLE, values,

WHERE_ID_EQUALS,

new String[] { String.valueOf(employee.getId()) });

Log.d("Update Result:", "=" + result);

return result;

}

public int delete(Employee employee) {

return database.delete(DataBaseHelper.EMPLOYEE_TABLE, WHERE_ID_EQUALS,

new String[] { employee.getId() + "" });

}

//USING query() method

public ArrayList<Employee> getEmployees() {

ArrayList<Employee> employees = new ArrayList<Employee>();

Cursor cursor = database.query(DataBaseHelper.EMPLOYEE_TABLE,

new String[] { DataBaseHelper.ID_COLUMN,

DataBaseHelper.NAME_COLUMN,

DataBaseHelper.EMPLOYEE_DOB,

DataBaseHelper.EMPLOYEE_SALARY }, null, null, null,

null, null);

while (cursor.moveToNext()) {

Employee employee = new Employee();

employee.setId(cursor.getInt(0));

employee.setName(cursor.getString(1));

try {

employee.setDateOfBirth(formatter.parse(cursor.getString(2)));

} catch (ParseException e) {

employee.setDateOfBirth(null);

}

employee.setSalary(cursor.getDouble(3));

employees.add(employee);

}

return employees;

}

//USING rawQuery() method

/*public ArrayList<Employee> getEmployees() {

ArrayList<Employee> employees = new ArrayList<Employee>();

String sql = "SELECT " + DataBaseHelper.ID_COLUMN + ","

+ DataBaseHelper.NAME_COLUMN + ","

+ DataBaseHelper.EMPLOYEE_DOB + ","

+ DataBaseHelper.EMPLOYEE_SALARY + " FROM "

+ DataBaseHelper.EMPLOYEE_TABLE;

Cursor cursor = database.rawQuery(sql, null);

while (cursor.moveToNext()) {

Employee employee = new Employee();

employee.setId(cursor.getInt(0));

employee.setName(cursor.getString(1));

try {

employee.setDateOfBirth(formatter.parse(cursor.getString(2)));

} catch (ParseException e) {

employee.setDateOfBirth(null);

}

employee.setSalary(cursor.getDouble(3));

employees.add(employee);

}

return employees;

}*/

//Retrieves a single employee record with the given id

public Employee getEmployee(long id) {

Employee employee = null;

String sql = "SELECT * FROM " + DataBaseHelper.EMPLOYEE_TABLE

+ " WHERE " + DataBaseHelper.ID_COLUMN + " = ?";

Cursor cursor = database.rawQuery(sql, new String[] { id + "" });

if (cursor.moveToNext()) {

employee = new Employee();

employee.setId(cursor.getInt(0));

employee.setName(cursor.getString(1));

try {

employee.setDateOfBirth(formatter.parse(cursor.getString(2)));

} catch (ParseException e) {

employee.setDateOfBirth(null);

}

employee.setSalary(cursor.getDouble(3));

}

return employee;

}

MainActivity class

This is the main activity class.
When the app starts, we add the EmpListFragment.
This activity handles proper back navigation of fragments on back key pressed by overriding onBackPressed(). It shows an alert dialog on quit.
It also handles fragment orientation changes and retain the fragment state by overriding onSaveInstanceState().

package com.androidopentutorials.sqlite;

import android.app.AlertDialog;
import android.content.DialogInterface;
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 android.view.MenuItem;

import com.androidopentutorials.sqlite.fragment.CustomEmpDialogFragment.EmpDialogFragmentListener;
import com.androidopentutorials.sqlite.fragment.EmpAddFragment;
import com.androidopentutorials.sqlite.fragment.EmpListFragment;

public class MainActivity extends FragmentActivity implements
		EmpDialogFragmentListener {

	private Fragment contentFragment;
	private EmpListFragment employeeListFragment;
	private EmpAddFragment employeeAddFragment;

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

		FragmentManager fragmentManager = getSupportFragmentManager();

		/*
		 * This is called when orientation is changed.
		 */
		if (savedInstanceState != null) {
			if (savedInstanceState.containsKey("content")) {
				String content = savedInstanceState.getString("content");
				if (content.equals(EmpAddFragment.ARG_ITEM_ID)) {
					if (fragmentManager
							.findFragmentByTag(EmpAddFragment.ARG_ITEM_ID) != null) {
						setFragmentTitle(R.string.add_emp);
						contentFragment = fragmentManager
								.findFragmentByTag(EmpAddFragment.ARG_ITEM_ID);
					}
				}
			}
			if (fragmentManager.findFragmentByTag(EmpListFragment.ARG_ITEM_ID) != null) {
				employeeListFragment = (EmpListFragment) fragmentManager
						.findFragmentByTag(EmpListFragment.ARG_ITEM_ID);
				contentFragment = employeeListFragment;
			}
		} else {
			employeeListFragment = new EmpListFragment();
			setFragmentTitle(R.string.app_name);
			switchContent(employeeListFragment, EmpListFragment.ARG_ITEM_ID);
		}
	}

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

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case R.id.action_add:
			setFragmentTitle(R.string.add_emp);
			employeeAddFragment = new EmpAddFragment();
			switchContent(employeeAddFragment, EmpAddFragment.ARG_ITEM_ID);

			return true;
		}
		return super.onOptionsItemSelected(item);
	}

	/*
	 * We consider EmpListFragment as the home fragment and it is not added to
	 * the back stack.
	 */
	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 EmpAddFragment is added to the back stack.
			if (!(fragment instanceof EmpListFragment)) {
				transaction.addToBackStack(tag);
			}
			transaction.commit();
			contentFragment = fragment;
		}
	}

	protected void setFragmentTitle(int resourseId) {
		setTitle(resourseId);
		getActionBar().setTitle(resourseId);

	}

	/*
	 * We call super.onBackPressed(); when the stack entry count is > 0. if it
	 * is instanceof EmpListFragment or if the stack entry count is == 0, then
	 * we prompt the user whether to quit the app or not by displaying dialog.
	 * In other words, from EmpListFragment on back press it quits the app.
	 */
	@Override
	public void onBackPressed() {
		FragmentManager fm = getSupportFragmentManager();
		if (fm.getBackStackEntryCount() > 0) {
			super.onBackPressed();
		} else if (contentFragment instanceof EmpListFragment
				|| fm.getBackStackEntryCount() == 0) {
            //Shows an alert dialog on quit
			onShowQuitDialog();
		}
	}

	public void onShowQuitDialog() {
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setCancelable(false);

		builder.setMessage("Do You Want To Quit?");
		builder.setPositiveButton(android.R.string.yes,
				new DialogInterface.OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int id) {
						finish();
					}
				});
		builder.setNegativeButton(android.R.string.no,
				new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int id) {
						dialog.cancel();
					}
				});
		builder.create().show();
	}

	@Override
	public void onFinishDialog() {
		if (employeeListFragment != null) {
			employeeListFragment.updateView();
		}
	}
}

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package com.androidopentutorials.sqlite;

import android.app.AlertDialog;

import android.content.DialogInterface;

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 android.view.MenuItem;

import com.androidopentutorials.sqlite.fragment.CustomEmpDialogFragment.EmpDialogFragmentListener;

import com.androidopentutorials.sqlite.fragment.EmpAddFragment;

import com.androidopentutorials.sqlite.fragment.EmpListFragment;

public class MainActivity extends FragmentActivity implements

EmpDialogFragmentListener {

private Fragment contentFragment;

private EmpListFragment employeeListFragment;

private EmpAddFragment employeeAddFragment;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

FragmentManager fragmentManager = getSupportFragmentManager();

* This is called when orientation is changed.

if (savedInstanceState != null) {

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

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

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

if (fragmentManager

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

setFragmentTitle(R.string.add_emp);

contentFragment = fragmentManager

.findFragmentByTag(EmpAddFragment.ARG_ITEM_ID);

}

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

employeeListFragment = (EmpListFragment) fragmentManager

.findFragmentByTag(EmpListFragment.ARG_ITEM_ID);

contentFragment = employeeListFragment;

}

} else {

employeeListFragment = new EmpListFragment();

setFragmentTitle(R.string.app_name);

switchContent(employeeListFragment, EmpListFragment.ARG_ITEM_ID);

}

@Override

protected void onSaveInstanceState(Bundle outState) {

if (contentFragment instanceof EmpAddFragment) {

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

} else {

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

}

super.onSaveInstanceState(outState);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

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

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

switch (item.getItemId()) {

case R.id.action_add:

setFragmentTitle(R.string.add_emp);

employeeAddFragment = new EmpAddFragment();

switchContent(employeeAddFragment, EmpAddFragment.ARG_ITEM_ID);

return true;

}

return super.onOptionsItemSelected(item);

}

* We consider EmpListFragment as the home fragment and it is not added to

* the back stack.

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 EmpAddFragment is added to the back stack.

if (!(fragment instanceof EmpListFragment)) {

transaction.addToBackStack(tag);

}

transaction.commit();

contentFragment = fragment;

}

protected void setFragmentTitle(int resourseId) {

setTitle(resourseId);

getActionBar().setTitle(resourseId);

}

* We call super.onBackPressed(); when the stack entry count is > 0. if it

* is instanceof EmpListFragment or if the stack entry count is == 0, then

* we prompt the user whether to quit the app or not by displaying dialog.

* In other words, from EmpListFragment on back press it quits the app.

@Override

public void onBackPressed() {

FragmentManager fm = getSupportFragmentManager();

if (fm.getBackStackEntryCount() > 0) {

super.onBackPressed();

} else if (contentFragment instanceof EmpListFragment

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

//Shows an alert dialog on quit

onShowQuitDialog();

}

public void onShowQuitDialog() {

AlertDialog.Builder builder = new AlertDialog.Builder(this);

builder.setCancelable(false);

builder.setMessage("Do You Want To Quit?");

builder.setPositiveButton(android.R.string.yes,

new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int id) {

finish();

}

});

builder.setNegativeButton(android.R.string.no,

new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int id) {

dialog.cancel();

}

});

builder.create().show();

}

@Override

public void onFinishDialog() {

if (employeeListFragment != null) {

employeeListFragment.updateView();

}

Output:

Insert a row – EmpAddFragment

Update a row – CustomEmpDialogFragment

Fetch all rows – EmpListFragment

Tags:android back navigation of fragments, Android Examples, Android orientation changes, Android SQLite, Android SQLite Date, Android SQLite Examples, SQLite

About The Author

nithya

Gilang Surahman
big thanks broo…
Gilang Surahman
when add columns project error.
i tried, can you fix it?
i send email to [email protected]
thank you..
Mehmet Gunacti
Question: in list_item.xml why is there a need for two RelativeLayouts, what’s the purpose ? Thanks.
Gregg Castignani
Get this error :java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapplication/com.myapplication.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method ‘void android.app.ActionBar.setTitle(java.lang.CharSequence)’ on a null object reference. I understand what it means but cant find a way to fix it
- Michael Martens
  comment out the action bar setTitle() commands where they exist in EmpAddFragment and MainActivity and the code should work. I am still trying to figure out how to put them back in, but commenting them out will not change how theSQLiteDatabase and AsyncTask code executes.
Yana Tsvihun
Thanks. Very good tutorial.
Emmanuel Buckshi
What a comprehensive and informative piece of work you have generously shared with us. Much gratitude and respect for all the knowledge and effort.
I am curious if you believe there may be a risk in declaring the Asynctasks as inner classes. I see that you are using a WeakReference to help avoid memory leaks, but I am still getting OutOfMemory errors. I likely have to do more troubleshooting to make sure I have recreated your project properly.
John Philip Mayordo
Is there a video tutorial for this?

April 2021
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Project Description

Employee Table

Android Project

Resources

colors.xml

strings.xml

Action Bar Menu Item (main.xml)

Layout files

activity_main.xml

fragment_add_emp.xml

fragment_emp_list.xml

list_item.xml

Create a SQLite database in Android

DataBaseHelper class

Employee DB DAO class

Insert a new record in SQLite database

Employee

Save Employee

Add Employee Fragment

Fetch records from SQLite database

EmployeeDAO class

Employee List Adapter

Display Database Records in ListView – Employee List Fragment

Update a row in SQLite database

EmployeeDAO class

CustomEmpDialogFragment class

Delete a row from SQLite database

EmployeeDAO class

Complete EmployeeDAO class

MainActivity class

Output:

Insert a row – EmpAddFragment

Update a row – CustomEmpDialogFragment

Fetch all rows – EmpListFragment

About The Author

nithya

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