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private void signOut() {
        FirebaseAuth.getInstance().signOut();
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();

        //mGoogleSignInClient = GoogleSignIn.getClient(ListViewDisp.this, gso);
        googleSignInClient.signOut()
                .addOnCompleteListener(ProfileActivity.this, new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        Intent intent = new Intent(ProfileActivity.this, MainActivity.class);
                        startActivity(intent);
                    }
                });
    }

int RC_SIGN_IN = 1;
private FirebaseAuth mAuth = FirebaseAuth.getInstance();
GoogleSignInClient mGoogleSignInClient;
GoogleSignInOptions gso;

gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                        .requestIdToken(getString(R.string.default_web_client_id))
                        .requestEmail()
                        .build();

mGoogleSignInClient = GoogleSignIn.getClient(MainActivity.this, gso);
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_SIGN_IN);

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == RC_SIGN_IN) {
        Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
        try {
            GoogleSignInAccount account = task.getResult(ApiException.class);
            firebaseAuthWithGoogle(account);
        } catch (ApiException e) {
                Log.d("demo", "Google sign in failed: " + e.getMessage());
        }
    }
}

private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
    AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
    mAuth.signInWithCredential(credential).addOnCompleteListener(this, new OnCompleteListener < AuthResult > () {
        @Override
        public void onComplete(@NonNull Task < AuthResult > task) {
            if (task.isSuccessful()) {
                FirebaseUser user = mAuth.getCurrentUser();
                Intent intent = new Intent(MainActivity.this, TripsActivity.class);
                startActivity(intent);
                finish();
            } else {
                Log.d("demo", "Google sign in failed");
            }
        }
    });
}