getPresenter() on fragment return null

[pishguy]

when i trying to use this library to implementing mvp for fragments, i get null for getPresenter(),

public class FragmentCategories extends MvpViewStateFragment<UserCategoriesView, UserCategoriesPresenter, UserCategoriesViewState>
        implements UserCategoriesView {

    @BindView(R.id.mainCategoriesFlipper)
    ViewFlipper mainCategoriesFlipper;

    @BindView(R.id.mainCategoryList)
    RecyclerView mainCategoryList;

    @BindView(R.id.categoryChildList)
    RecyclerView categoryChildList;

    @BindView(R.id.selectedChannelsList)
    RecyclerView selectedChannelsList;

    private Unbinder              unbinder;
    private List<MainCategories>  mainCategories;
    private List<ChildCategories> childCategories;
    private List<Channels>        channelsList;
    private Activity              activity;
    private Context               context;
    private MainCategoryAdapter   mainCategoryAdapter;
    private ChildCategoryAdapter  childCategoryAdapter;

    @Override
    public UserCategoriesPresenter createPresenter() {
        return new UserCategoriesPresenter();
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, final ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_categories, container, false);
        mainCategories =  getPresenter().getAllMainCategoryList();

        return view;
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        unbinder.unbind();
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        unbinder = ButterKnife.bind(this, view);
        EventBus.getDefault().register(this);
    }

    @NonNull
    @Override
    public UserCategoriesViewState createViewState() {
        return new UserCategoriesViewState();
    }

    @Override
    public void onNewViewStateInstance() {
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        EventBus.getDefault().unregister(this);
    }
}

fragment presenter class:

public class UserCategoriesPresenter extends MvpBasePresenter<UserCategoriesView> {

    public List<MainCategories> getAllMainCategoryList() {
        return SQLite.select().from(MainCategories.class).queryList();
    }
}

[sockeqwe]

Presenter is available only after onViewCreated() lifecycle callback (which is the next one after onCreateView () ). Don't forget to call super.onViewCreated() when overriding

Mahdi Pishguy notifications@github.com schrieb am Mi., 31. Mai 2017, 06:28:

when i trying to use this library to implementing mvp for fragments, i get null for getPresenter(),

public class FragmentCategories extends MvpViewStateFragment<UserCategoriesView, UserCategoriesPresenter, UserCategoriesViewState> implements UserCategoriesView {

@BindView(R.id.mainCategoriesFlipper)
ViewFlipper mainCategoriesFlipper;

@BindView(R.id.mainCategoryList)
RecyclerView mainCategoryList;

@BindView(R.id.categoryChildList)
RecyclerView categoryChildList;

@BindView(R.id.selectedChannelsList)
RecyclerView selectedChannelsList;

private Unbinder              unbinder;
private List<MainCategories>  mainCategories;
private List<ChildCategories> childCategories;
private List<Channels>        channelsList;
private Activity              activity;
private Context               context;
private MainCategoryAdapter   mainCategoryAdapter;
private ChildCategoryAdapter  childCategoryAdapter;

@Override
public UserCategoriesPresenter createPresenter() {
    return new UserCategoriesPresenter();
}

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, final ViewGroup container,
                         Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_categories, container, false);
    mainCategories =  getPresenter().getAllMainCategoryList();

    return view;
}

@Override
public void onDestroyView() {
    super.onDestroyView();
    unbinder.unbind();
}

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    unbinder = ButterKnife.bind(this, view);
    EventBus.getDefault().register(this);
}

@NonNull
@Override
public UserCategoriesViewState createViewState() {
    return new UserCategoriesViewState();
}

@Override
public void onNewViewStateInstance() {
}

@Override
public void onDestroy() {
    super.onDestroy();
    EventBus.getDefault().unregister(this);
}

}

fragment presenter class:

public class UserCategoriesPresenter extends MvpBasePresenter {

public List<MainCategories> getAllMainCategoryList() {
    return SQLite.select().from(MainCategories.class).queryList();
}

}

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[pishguy]

@sockeqwe now how can i fix that? i don't understand how can i modify code

[sockeqwe]

just move presenter interaction in onViewCreated()

    @Override
    public View onCreateView(LayoutInflater inflater, final ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_categories, container, false);
        return view;
    }

    @Override
    public View onViewCreated(View view, Bundle bundle) {
        super.onViewCreated(view, bundle);
         // From now on, presenter is instantiated
         mainCategories =  getPresenter().getAllMainCategoryList();
    }