android google sign in window doesn't pop again after logout

On my Android app I have a Google Plus sign-in button in my MainActivity. I use these lines in my onCLick() method:

mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(Plus.API, Plus.PlusOptions.builder().build())
                .addScope(Plus.SCOPE_PLUS_LOGIN)
                .build();

mGoogleApiClient.connect();

And the first time I press the button a sign-in window comes up. I log in successfully with my google account into HomeActivity, and then successfully logout, using this 2 lines:

Plus.AccountApi.clearDefaultAccount(AppController.getInstance().getmGoogleApiClient());
mGoogleApiClient.disconnect();

(I tried to put mGoogleApiClient.connect(); as a 3rd line.. it didn't change anything)

So then I return to MainActivity, but when I press the sign-in Button again, it automatically signs me in back to HomeActivity, without popping up the sign-in window like the first time... although I alledgedly signed-out...

Does someone know what else should I add to my code? Or perhaps there is a way to manually show that sign-in window? What makes it pop the first time?

Thank you very much!

You need to add the following code at Log out, so it will clear all user data from your app, and after re-login you will get popping up the sign-in window like the first time.

public void signOutFromGplus() {
    if (mGoogleApiClient.isConnected()) {
        Plus.AccountApi.clearDefaultAccount(mGoogleApiClient);
        Plus.AccountApi.revokeAccessAndDisconnect(mGoogleApiClient);
        mGoogleApiClient.disconnect();
        mGoogleApiClient.connect();
    }
}