How do I catch Flutter Google sign-in PlatformException?

Question

Following the brilliant Firebase Flutter tutorial, I'm trying to incorporate Google sign-in into my app.

The flow: If not logged in, user will always arrive at login page (via checks at the MaterialApp's onGenerateRoute), user then presses the Login button and redirected to the Google sign-in flow. However, should the user cancel the flow midway, I'd like to return to the login page, forcing her to press the button again.

I fail to catch the PlatformException for some reason (you can see it in the debugger, and the app hanging in the simulator):

The code I'm using:

  Future<bool> logIn() async {
    print('Login::logIn()');
    bool loggedIn = await logInSilently();
    print('Login::logIn() - silent login returned $loggedIn');
    if (loggedIn == false) {
      try {
        await googleSignIn.signIn();
      } catch (e) {
        print('Login::logIn() - interactive login failed: $e');
        return false;
      }
    }
    return true;
  }

The print statement inside the catch block is never printed, and the app hangs. I've upgraded flutter and re-tested before posting the question - the issue is still there.

(To clarify: The "happy path" -- i.e. user successfully going through the Google sign-in flow -- works.)

Answer 1

I believe this was fixed in google_sign_in version 0.2.1.

Try putting changing your google_sign_in dependency in your pubspec.yaml to ^0.2.1 and see if that helps.