Question

Since fragments are intended to encapsulate logic I decided to put BroadReceiver logic in my own fragment.

At first I setup an Alarm like it was shown in ApiDemos:

Intent intent = new Intent(getActivity(),OnAirPresentBroadcastReceiver.class);
PendingIntent sender = PendingIntent.getBroadcast(getActivity(), 0, intent, 0);

Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.add(Calendar.SECOND, 30);

AlarmManager am = (AlarmManager) getActivity().getSystemService(Context.ALARM_SERVICE);
am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);

OnAirPresentBroadcastReceiver receives the broadcast and the purpose of this broadcast is to update the fragment’s UI. I’m stuck here – is it possible and how ?

Answer 1

From your Receiver you can post another Intent to your Activity. From the Activity you can access the Fragment with the FragmentManager.

Intent notificationIntent = new Intent(context, MainActivity.class);
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
notificationIntent.putExtra("extra", "extra");
context.startActivityForResult(notificationIntent, 0);

It’ll you’ll get it on your Activity in:

@Override
protected void onNewIntent(Intent intent)
{
    handleNotification(intent);

    super.onNewIntent(intent);
}

If your Activity is not running you’ll have Extra’s to your intent in OnCreate

To make sure your Activity is in foreground: (this code get the foreground Activity)

ActivityManager am = (ActivityManager) context.getSystemService(Activity.ACTIVITY_SERVICE);
List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);
String name = taskInfo.get(0).topActivity.getShortClassName();
if (name.equals(".YOUR_ACTIVITY_NAME")) 
    {
    //only now start your intent.
    }

Another direction you can try:

Intent intent = new Intent(getActivity(),YOUR_ACTIVITY_HERE.class);
PendingIntent sender = PendingIntent.getActivitygetActivity(), 0, intent, 0);

Now the event you come in your Activity’s onNewIntent function, if its active. That’s not a full solution but that could be a nice direction.