BasicMVP.java

//MainActivity.java
public class MainActivity extends AppCompatActivity {
    private MainPresenter presenter;
    //Simply a singleton of Bus
    private Bus bus = BusManager.getInstance(); 
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);
 
        presenter = new MainPresenter(
            new MainView(this, bus),
            new MainModel(bus)
        );
    }
    
    @Override
    protected void onResume() {
        super.onResume();
        register(presenter);
    }
    
    @Override
    protected void onPause() {
        super.onPause();
        unregister(presenter);
    }
}

//MainPresenter.java 
public class MainPresenter {
    private final MainModel model;
    private final MainView view;

    public MainPresenter(MainView view, MainModel model) {
        this.view = view;
        this.model = model;
    }
}

//MainView.java
public class MainView {
    private final Bus bus;
    private WeakReference<AppCompatActivity> activityRef;
  
    public MainView(AppCompatActivity activity, Bus bus) {
        activityRef = new WeakReference<>(activity);
        this.bus = bus;
    }

    @Nullable
    public AppCompatActivity getActivity() {
        return activityRef.get();
    }
}

//MainModel.java
public class MainModel {
    private final Bus bus;
  
    public MainModel(Bus bus) {
        this.bus = bus;
    }
}