批量推送Firebase注销

Question

I am creating an app on Android that uses Firebase as database and Batch for pushing notifications. Usually, when my app starts, it goes to the main page, a login activity. The activity verifies if a user is still logged in using:

Firebase dbRef = new Firebase(Constants.URL_DB);
AuthData auth = dbRef.getAuth();

if (auth != null) // Proceed with a logged in user
else // Show authentication layout

My problem is that when I get a notification from Batch, I click on the notification to go to the app but then I am not logged in as I should be... auth == null . I don't want my users to need to log in every time they get a push from Batch. Can I detect that the app started from a notification? How is that I lose authentication from Firebase?

Here is the onCreate and onResume of the MainActivity:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Initiating Batch
    Batch.onStart(this);

    // Initiating layout
    setContentView(R.layout.login);

    // Setting database
    Firebase.setAndroidContext(this);

    // Unrelated stuff done here (Setting Views, etc)
}

@Override
protected void onResume() {
    super.onResume();

    // Getting login information from previous authentication.
    Firebase dbRef = new Firebase(Constants.URL_DB);
    AuthData auth = dbRef.getAuth();

    // I added the addAuthStateListener here

    if (auth != null) {
        goToHomePage();
    }
}

Answer 1

All right I found the problem. When I click on the notification, my MainActivity is called obviously. The thing is that when the user is logged in successfully, I start another Activity using:

startActivityForResult(intent, Constants.SUCCESS);

Now, onActivityResult is normally called to log out the user when the back button has been pressed on the home page. Otherwise, onResume is called and since the user is logged in, I would go straight back to the home page. BUT: when I click on a notification, somehow onActivityResult is called (probably because the activity stack gets trashed) and the user is logged out before resuming the activity.

So the solution is to log out the user in the onBackPressed of the home page activity. Then I don't need to startActivityForResult anymore.

// In the home page activity
@Override
public void onBackPressed() {
    super.onBackPressed();
    Firebase dbRef = new Firebase(Constants.URL_DB);
    dbRef.unauth();
    finish();
}