@Override
 public boolean onOptionsItemSelected(MenuItem item) {
   switch (item.getItemId()) {
     case R.id.add_payment:
       {
         startAddPaymentActivity();
         return true;
       }
     case R.id.synchronize:
       {
         synchronize();
         return true;
       }
     default:
       {
         return super.onOptionsItemSelected(item);
       }
   }
 }