Android : Ask To Exit Alert Box.

Alert Box For Asking To Exit.

Follow Below Steps.

1. Create New Android Project. Name It Exit as i did.

2. Now Open Your activity_main.xml. Follow Path .res --> Layout --> activity_main.xml.
    I Have Added Analog Clock To Graphical Layout Because I don't Wanted To left screen as blank so..
    You May Left Your Screen Blank For Now.
3. Type Below Code To Your activity_main.xml

activity_main.xml

<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:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >

    <AnalogClock

        android:id="@+id/analogClock1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:layout_marginLeft="64dp"

        android:layout_marginTop="37dp" />

</RelativeLayout>

4. Open Your MainActivity.java File And Type Below code.

MainActivity.java

package arshad.exit;

import android.os.Bundle;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.view.Menu;

public class MainActivity extends Activity {

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.activity_main);

       }

        public void onBackPressed() {

               new AlertDialog.Builder(this)

                      .setMessage("Do you want to exit?")

                      .setCancelable(false)

                      .setPositiveButton("Yes", new DialogInterface.OnClickListener() {

                          public void onClick(DialogInterface dialog, int id) {

                               MainActivity.this.finish();

                          }

                      })

                      .setNegativeButton("No", null)

                      .show();

           }

       @Override

       public boolean onCreateOptionsMenu(Menu menu) {

              // Inflate the menu; this adds items to the action bar if it is present.

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

              return true;

       }

}

5. Now Compile And Run Your Project As Android Application.

6. When Your Application Executes Press Back Button. The Alert Box Will Ask To Exit.

My Output Screen's Are As Below.

 All The Best :)