TweetsListUI java destroying any resources

TweetsListUI.java

public class TweetsListUI extends ViewUI {
  @Inject
  SearchViewDelegate viewDelegate;

  @Inject
  StateFlowHandler stateFlowHandler;

  // ...
  @Override
  public void onDestroy() {
    stateFlowHandler.cancel();
    viewDelegate.cancel();
    super.onDestroy();
  }
}