GCM IntentService how to display a pop up on notification receive

Question

I would like to, on receive of a GCM, display a Popup on my current Activity if my app is active.

I wanted to access my current activity in GcmIntentService but I do

Answer 1

I have something like this:

In your GCM broadcast receiver

Intent intent = new Intent(NOTIFICATION_ACTION);
intent.putExtra(EXTRA_PARAMETER, "something you want to pass as an extra");
context.sendBroadcast(intent);

In your BaseActivity (an Activity that is extended by all the activities that you want to show the pop up)

private BroadcastReceiver notificationBroadcastReceiver = new NotificationBroadcastReceiver();

@Override
protected void onStart() {
    super.onStart();
    IntentFilter intentFilter = new IntentFilter(NOTIFICATION_ACTION);
    registerReceiver(notificationBroadcastReceiver, intentFilter);
}

@Override
protected void onStop() {
    super.onStop();
    unregisterReceiver(notificationBroadcastReceiver);
}

private class NotificationBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        //Show popup
    }
}

NOTIFICATION_ACTION is a constant you should define somewhere