How to logout of Google Sign-In?

Question

How do I logout out of Google Sign In?

I know that I would be able to call mGoogleSignInClient.signOut() , but I create the mGoogleSignInClient in my login activity. How could I access it in my settings activity (where the logout happens)?

val gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
        .requestIdToken("id_token")
        .requestEmail()
        .build()

googleSignInClient = GoogleSignIn.getClient(this, gso)

In my settings activity, where I have the logout button, I want to be able to call some static method relating to the Google Sign-In SDK and logout.

Do I really need to repeat the steps above (which I implemented in my login activity) into my settings activity (where the logout button is)?

Answer 1

You can use this for logout click

Auth.GoogleSignInApi.signOut(googleApiClient).setResultCallback(new ResultCallback<Status>() {
   @Override
   public void onResult(@NonNull Status status) {
      //set your action after log out
   }
});

Answer 2

According to the docs , using the signInClient:

mGoogleSignInClient.signOut()
            .addOnCompleteListener(this, new OnCompleteListener<Void>() {
                @Override
                public void onComplete(@NonNull Task<Void> task) {
                    // ...
                }
            });

Answer 3

I guess these answers (@arjun, @Till) don't really answer the question

Both of them assume the instance of GoogleSignInClient is present

But @rgoncalv asked: "Do I really need to repeat the steps above?"

This means: does he/she need to create the same instance of GoogleSignInClient (with the same options) to sign out as it was created in the login activity?

BTW I'm interested the same

Answer 4

As pointed out in this answer , in your login activity you can pass to GoogleSignIn.getClient() the application context instead of the activity context.

So in your settings activity you can simply do the following:

GoogleSignInClient googleSignInClient = GoogleSignIn.getClient(getApplicationContext(), GoogleSignInOptions.DEFAULT_SIGN_IN);
signOut(googleSignInClient);
revokeAccess(googleSignInClient);

The definitions of signOut() and revokeAccess() can be found here .

Answer 5

Its a bit tricky,

• I used sharedpreferences to create a flag if user is logged in or not.
• When I set the flag to logout, In my code I navigate back to login
  activity
• On login activity -> onStart(), if sharedpreference flag is logged
  out but GoogleSignInAccount is not null , do the signout and show the login UI.

Note, for new Login the logout wont work since user is not logged in yet.