How to create a notification pending intent which just brings up the top app activity?

Currently I use an Activity which finishes immediately, thus pulling the last Activity from the app stack.

public class ViewlessActivity extends Activity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    finish();
  }
}

Is there any better solution?

UPDATE:

I followed the recommendation from David but couldn't make it working like required (it is always showing the MainActivity)

Here the code which creates the pending intent:

Intent mainActivityIntent = new Intent(this.getApplicationContext(), MainActivity.class);
mainActivityIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent pendingMainActivityIntent = PendingIntent.getActivity(this.getApplicationContext(), 0, mainActivityIntent, PendingIntent.FLAG_CANCEL_CURRENT);