private void doFetchToken() {
    FetchToken fetchToken = new FetchToken(ProfileActivity.this, email, SCOPE) {
        @Override
        protected void onPostExecute(final String jsonResponse) {
            if(jsonResponse == null)
                return;

            runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                try {
                    etUsername.setText(getFirstName(jsonResponse));
                    etEmail.setText(email);
                } catch (JSONException e) {
                    show(e.getMessage());
                }
                 }
            });
        }
    };
        fetchToken.execute();
}