How can I update Activity/Fragment UI from Retrofit onResponse()?

Question

I want to use Retrofit 2.1.0 for my next Android project. I would like to use Design Pattern and therefore create separate classes for every REST call i.e

IBalanceServ

Answer 1

Make an interface like this on:

public interface BalanceListener {

    void onUserAvailable(User user);

}

In your BalanceRestClient have an instance of it. And in onResponse:

  @Override
  public void onResponse(Call call, Response response) {

      User user = response.body();  

      listener.onUserAvailable(user);

  }

Make your Activity implement BalanceListner:

 public class BalanceActivity extends Activity implements BalanceListener {
                ......

        @Override
        public void onUserAvailable(User user) {
            // update user views here
        }
    }