Listen to auth events

1Amplify.Hub.subscribe(HubChannel.AUTH,
2    hubEvent -> {
3        if (hubEvent.getName().equals(InitializationStatus.SUCCEEDED.name())) {
4            Log.i("AuthQuickstart", "Auth successfully initialized");
5        } else if (hubEvent.getName().equals(InitializationStatus.FAILED.name())){
6            Log.i("AuthQuickstart", "Auth failed to succeed");
7        } else {
8            String eventName = hubEvent.getName();
9            if (eventName.equals(SIGNED_IN.name())) {
10                Log.i("AuthQuickstart", "Auth just became signed in.");
11            }
12            else if (eventName.equals(SIGNED_OUT.name())) {
13                Log.i("AuthQuickstart", "Auth just became signed out.");
14            }
15            else if (eventName.equals(SESSION_EXPIRED.name())) {
16                Log.i("AuthQuickstart", "Auth session just expired.");
17            }
18            else if (eventName.equals(USER_DELETED.name())) {
19                Log.i("AuthQuickstart", "User has been deleted.");
20            }
21            else {
22                Log.w("AuthQuickstart", "Unhandled Auth Event: " + eventName);
23            }
24        }
25    }
26);