Android Popup box/Dialog box code example - Java

When Developing an Android application, sometimes you want to have confirmation on the action done by the user. Using a popup box or dialog box will help to get the user's intention on what are they doing. 

Here is the sample code to use the popup box/dialog box to show a message to the user. 

Full Code example.

 import androidx.appcompat.app.AlertDialog;  
 import androidx.appcompat.app.AppCompatActivity;  
 import android.content.DialogInterface;  
 import android.os.Bundle;  
 public class MainActivity extends AppCompatActivity {  
   @Override  
   protected void onCreate(Bundle savedInstanceState) {  
     super.onCreate(savedInstanceState);  
     setContentView(R.layout.activity_main);  
   }  
   @Override  
   public void onBackPressed(){  
     ShowMessageExit("Are You Sure You Want To Quit?");  
   }  
   private void ShowMessageExit(String Message){  
     new AlertDialog.Builder(this)  
         .setMessage(Message)  
         .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {  
           public void onClick(DialogInterface dialog, int which) {  
             android.os.Process.killProcess(android.os.Process.myPid());  
             System.exit(0);  
           }  
         })  
         .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {  
           public void onClick(DialogInterface dialog, int which) {  
             // do nothing  
           }  
         })  
         .setIcon(android.R.drawable.ic_dialog_alert)  
         .show();  
   }  

Output.

User getting confirmation once clicks back button in the navigation panel.