Android Google Plus sign in issue. handleSignInResult returns False

Please insure that you had applied SHA-1 debug key in the google-services.json file creation.

Are you using Plus.API or Auth.GOOGLE_SIGN_IN_API? The latter is the latest revamped one. Check it out here: https://developers.google.com/identity/sign-in/android/sign-in

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If you are using Auth.GOOGLE_SIGN_IN_API:

In onActivityResult, use code similar to below and you can get a status code, which is defined by GoogleSignInStatusCodes: https://developers.google.com/android/reference/com/google/android/gms/auth/api/signin/GoogleSignInStatusCodes

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
    if (requestCode == RC_SIGN_IN) {
        GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
        int statusCode = result.getStatus().getStatusCode();
    }
}

The most common issue is missing the right OAuth2 client registration. (Unfortunately, for now, the status code is INTERNAL_ERROR 8, which is not helpful. ) E.g. Take a look at this thread: Occured an INTERNAL_ERROR when requestEmail from GoogleSignInOptions Android