使用按钮关闭通知栏中的通知，而不打开应用程序aga

Question

public void addnotification() {
    NotificationCompat.Builder mbuilder = new NotificationCompat.Builder(
        this);
    Intent intent = new Intent(this, Main2Activity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
        intent, PendingIntent.FLAG_UPDATE_CURRENT);
    mbuilder.setSmallIcon(R.mipmap.ic_launcher);
    mbuilder.setContentTitle("Notification");
    mbuilder.setContentText("hi there");
    mbuilder.setContentIntent(pendingIntent);
    mbuilder.setOngoing(true);
    mbuilder.addAction(R.mipmap.ic_launcher, "close", pendingIntent);
    NotificationManager manager = (NotificationManager)
    getSystemService(Context.NOTIFICATION_SERVICE);
    manager.notify(0, mbuilder.build());
}

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    String ns = Context.NOTIFICATION_SERVICE;
    NotificationManager nMgr = (NotificationManager)
    getApplicationContext().getSystemService(ns);
    nMgr.cancel(0);
    finish();
}

关闭按钮会关闭所有通知，但在关闭通知时会再次打​​开应用程序。

我想要的是当我点击它时它应该删除通知但不应该打开应用程序，它应该保持在同一个屏幕上。