Season-2, lecture 221, control app exist with back button

প্রথমে জাভা তে গিয়ে রাইট ক্লিক করে "Generate" তারপর override method >> onbackpressed এরপর নিচের কোড

 @Override

public void onBackPressed() {
    //super.onBackPressed();
    new AlertDialog.Builder(MainActivity.this)
            .setTitle("Do you want To exit!")
            .setMessage("Are you sure?")
            .setIcon(R.drawable.images)
            .setNegativeButton("No", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                }
            })
            .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                    finish();
                }
            })
            .show()
            .setCancelable(true);
    ;
}