Alert Dialogue Example

package activity.fairline.com.alerttest;

import android.app.DatePickerDialog;
import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {
 

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

// Get the Builder to create the AlertDialog

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

// Set the Properties
        alertBuilder.setMessage("Do you want to exit from the application?");
        alertBuilder.setCancelable(false);
        alertBuilder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {

                MainActivity.this.finish();
            }
        });
            alertBuilder.setNegativeButton("No", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

   // crate the AlertDialog      
AlertDialog ald = alertBuilder.create();
       
// Display the AlertDialog
ald.show();
    }
}