Android - Clicking on notification doesn't lead to activity

I have a timer that creates a notification on completion. Clicking on the notification should lead to an activity called TimerActivity. I create a notification like this: ``` mBuilder = new NotificationCompat.Builder(this) .setSmallIcon(completeNotificationIcon) .setContentTitle(completeNotificationTitle) .setContentText(completeNotificationText) .setTicker(completeNotificationTicker) .setAutoCancel(true); Intent notificationIntent = new Intent(this, TimerActivity.class); PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, Intent.FLAG_ACTIVITY_REORDER_TO_FRONT); mBuilder.setContentIntent(contentIntent); mNotificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE); mNotificationManager.notify(NOTIFICATION_ID, mBuilder.build()); ``` The problem is the activity doesn't open, the notification just autocancels. On further investigation, it's only TimerActivity that won't open like this. If I change the intent to open say SttingsActivity.class, it works as it should. TimerActivity in the manifest: ``` <activity android:name=".TimerActivity" android:parentActivityName=".MainActivity" android:label="@string/action_timer" android:theme="@style/AppTheme"> <meta-data android:name="android.support.PARENT_ACTIVITY" android:value=".MainActivity" /> </activity> ``` But it's defined like any of these other activities that work/can be opened by clicking on a notification