BaseFragment.java

public abstract class BaseFragment extends Fragment {

    // region Member Variables
    protected List<Call> calls;
    // endregion

    // region Lifecycle Methods
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        calls = new ArrayList<>();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();

        for (final Call call : calls) {

            try {
                call.cancel();
            } catch (NetworkOnMainThreadException e) {
                e.printStackTrace();
            }
        }

        calls.clear();
    }
    // region
}