AlertDialog

MainActivity.java:

@Override
public void onBackPressed() {
new AlertDialog.Builder(MainActivity.this)
.setIcon(R.drawable.ic_baseline_warning_24)
.setTitle("Exit")
.setMessage("Are you sure you want to exit this app")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
}).setNeutralButton("Help", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this, "pres Yes to exit this app", Toast.LENGTH_SHORT).show();

}
}).setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
}).show();
}