Android Google Sign In: check if User is signed in

Question

I am looking for a way to check if my user already signed in with Google Sign In.

I support several logging APIs (Facebook, Google, custom), so I would like to build a s

Answer 1

Take a look at the Android sign-in documentation:

To check if the user is signed-in, call isConnected():

if (mGoogleApiClient != null && mGoogleApiClient.isConnected()) {
   // signed in. Show the "sign out" button and explanation.
   // ...
} else {
   // not signed in. Show the "sign in" button and explanation.
   // ...
}

Answer 2

You can use this function

private boolean isSignedIn() {
  return GoogleSignIn.getLastSignedInAccount(context) != null;
}

https://developers.google.com/android/reference/com/google/android/gms/auth/api/signin/GoogleSignIn

public static GoogleSignInAccount getLastSignedInAccount (Context context)

Gets the last account that the user signed in with.

Returns: GoogleSignInAccount from last known successful sign-in. If user has never signed in before or has signed out / revoked access, null is returned.

Answer 3

Implemented in Kotlin, and using Anko:

    val googleSignInAccount = GoogleSignIn.getLastSignedInAccount(act)
    if (googleSignInAccount != null) {
        getGoogleSignInClient().signOut()
    }