Dialog Prompt before closing app

What we will do ?
-> We will use the default hello world application, if the back button is pressed then there will be a dialog box displayed whether to close the application.

What we will need ?

• Dialog Box
• Changes in MainActivity.java

Step 1 : Create a new Application. Click on File->New->Android Application Project.

Step 2 : Give a name to your application (ExitPrompt) and package name as (com.mia.exitprompt). Click Next continuously.

Click Finish.

Step 3 : Open MainActivity.java from src->com.mia.exitprompt.

MainActivity.java

package com.mia.exitprompt;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
  
    public void onBackPressed(){  
  AlertDialog.Builder builder = new AlertDialog.Builder(this);
  builder.setMessage("Are you sure you want to exit ?")
  .setCancelable(false)
  .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
   @Override
   public void onClick(DialogInterface arg0, int arg1) {
    // TODO Auto-generated method stub
    finish();
   }
  });

 .setNegativeButton("No", new DialogInterface.OnClickListener() {
  @Override
  public void onClick(DialogInterface arg0, int arg1) {
   // TODO Auto-generated method stub 
  }
 });
  AlertDialog alert = builder.create();
  alert.show();
  }
}

Step 4 : Run the application. Press the Back button after the application is started.

Explanation of the code :

• We have prepared an AlertBox. Using the setMessage() method we set the text to be displayed in the alert.
• setCancelable(false) is used to tell the compiler that the alert box is not exited implicitly.
• The positive button (yes) is used to exit the application by using finish() method.
• The negative button (no) is used to be in the same activity by doing nothing inside it.

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