通知中的待定意图不起作用

下面是我应该打开的代码块NotificationActivity当点击通知时。但它不起作用。

private void setNotification(String notificationMessage) {
    Uri alarmSound = getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
    mNotificationManager  = getApplication().getSystemService(Context.NOTIFICATION_SERVICE);

    Intent notificationIntent = new Intent(getApplicationContext(), NotificationActivity2.class);

    PendingIntent contentIntent = PendingIntent.getActivity(this, 0,notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

    NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext())
    .setSmallIcon(R.drawable.logo)
    .setContentTitle("My Notification")
    .setStyle(new NotificationCompat.BigTextStyle()
    .bigText(notificationMessage))
    .setContentText(notificationMessage).setAutoCancel(true);
    mBuilder.setSound(alarmSound);
    mBuilder.setContentIntent(contentIntent);
    mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());

}

尝试这个：

private void setNotification(String notificationMessage) {

//**add this line**
int requestID = (int) System.currentTimeMillis();

Uri alarmSound = getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
mNotificationManager  = getApplication().getSystemService(Context.NOTIFICATION_SERVICE);

Intent notificationIntent = new Intent(getApplicationContext(), NotificationActivity2.class);

//**add this line**
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP); 

//**edit this line to put requestID as requestCode**
PendingIntent contentIntent = PendingIntent.getActivity(this, requestID,notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext())
.setSmallIcon(R.drawable.logo)
.setContentTitle("My Notification")
.setStyle(new NotificationCompat.BigTextStyle()
.bigText(notificationMessage))
.setContentText(notificationMessage).setAutoCancel(true);
mBuilder.setSound(alarmSound);
mBuilder.setContentIntent(contentIntent);
mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build());

}