private void loginClicked() {
    String userName = mLoginName.getText().toString();

    if (userName.isEmpty()) {
        Toast.makeText(this, "Please enter a name", Toast.LENGTH_LONG).show();
        return;
    }

    if (!getSinchServiceInterface().isStarted()) {
        getSinchServiceInterface().startClient(userName);
        showSpinner();
    } else {
        Intent mainActivity = new Intent(this, PlaceCallActivity.class);
        startActivity(mainActivity);	
    }
}