JournetMVPLoader_LoaderActivity.java

public class MainActivity extends AppCompatActivity implements MainViewInterface,
  LoaderManager.LoaderCallbacks<MainPresenter> {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      // start the loader to load the presenter

      /* 1001 is a unique loader id through which system manages
         a single instance of loader for an activity, the null
         parameter is the bundle we may wish to pass, and this 
         indicated that the loader callback are implemented by this 
         activity. */
         getSupportLoaderManager().initLoader(1001, null, this);
}