Android two way view - Horizontal Recyclerview inside Vertical Recyclerview

问题

I want to create a dynamic loading view that contains horizontal recyclerview inside vertical recyclerview and vertical recyclerview should be inside Scrollview as the main view contains some more views components. So my dynamic hierarchy is as following:-

 Scrollview [
  | Viewpager --
  | AdView --
  | Vertical Items - Recyclerview {
       1) [Horizontal Recyclerview {1.1, 1.2, 1.3} [Lazy Loading of Items]]
       2) [Horizontal Recyclerview {2.1, 2.2, 2.3} [Lazy Loading of Items]]
       3) [Horizontal Recyclerview {3.1, 3.2, 3.3} [Lazy Loading of Items]]
       4) [Horizontal Recyclerview {4.1, 4.2, 4.3} [Lazy Loading of Items]]
       .
       .
       .
    [Lazy Loading of Items in Vertical Direction also]
       }
   | Some Another View --
          ]

Is there any best way to achieve this type of view in android. So dynamic loading of items can be achieved in both horizontal and vertical directions ? Are there any lib available in android ? Please suggest me some good examples of this.

回答1:

The best way is to use the RendererRecyclerViewAdapter

Step 1: add ViewModel interface to your simple item

public class SimpleItem implements ViewModel {
    /* your getters */
}

Step 2: Create ViewBinder for your simple item

private ViewRenderer getSimpleViewBinder() {
    return new ViewBinder<>(
        R.layout.simple_item, /* your item layout */
        SimpleItem.class, /* your model class */
        (model, finder, payloads) -> {
            /* your binding */
            finder.setText(R.id.textView, model.getText());
    });
}

Step 3: Extend DefaultCompositeViewModel and add an uniq ID of your horizontal item

public class HorizontalViewModel extends DefaultCompositeViewModel {

    private int mID;

    public HorizontalViewModel(int ID, List<? extends ViewModel> items) {
        super(items);
        mID = ID;
    }

    public int getID() {
        return mID;
    }
}

It is your Horizontal item that contains all simple items inside.

Step 4: Create HorizontalViewBinder

public class HorizontalViewBinder extends CompositeViewBinder<HorizontalViewModel> {

    public HorizontalViewBinder(int layoutID,
                                int recyclerViewID,
                                Class<HorizontalViewModel> type) {
        super(layoutID, recyclerViewID, type);
    }

    @Override
    public void bindView(HorizontalViewModel model, CompositeViewHolder holder) {
        super.bindView(model, holder);
        holder.getRecyclerView().addOnScrollListener(new EndlessScrollListener() {
            @Override
            public void onLoadMore(int page, int totalItemsCount) {
                holder.getAdapter().showLoadMore();
                /* sendLoadMoreRequest(model.getID()); */
            }
        });
    }

    @NonNull
    @Override
    public CompositeViewHolder createViewHolder(ViewGroup parent) {
        final CompositeViewHolder viewHolder = super.createViewHolder(parent);
        viewHolder.getAdapter().registerRenderer(new LoadMoreViewBinder(R.layout.load_more)); 
        /* don't forget to create load more layout */
        return viewHolder;
    }
}

Step 5: Create a getter for your HorizontalViewBinder

private ViewRenderer getHorizontalViewBinder() {
    return new HorizontalViewBinder<>(
        R.layout.horizontal_layout, /* your horizontal layout that contains RecyclerView */
        R.id.recycler_view, /* an ID of RecyclerView */
        HorizontalViewModel.class /* your created class, see Step 3 */
    );
}

Step 6: Initialize in your Fragment/Activity the main RendererRecyclerViewAdapter

RendererRecyclerViewAdapter mRecyclerViewAdapter = new RendererRecyclerViewAdapter();
mRecyclerViewAdapter.registerRenderer(new Horizontal().registerRenderer(getHorizontalViewBinder().registerRenderer(getSimpleViewBinder())); /* register HorizontalViewBinder and SimpleViewBinder */
mRecyclerViewAdapter.setItems(getYourList());

Step 7: Add LoadMoreListener to main RecyclerView

mRecyclerView.addOnScrollListener(new EndlessScrollListener() {
    @Override
    public void onLoadMore(int page, int totalItemsCount) {
        mRecyclerViewAdapter.showLoadMore();
        /* send request to a server */
    }
});

Step 8: Create specials ViewBinders for other your items: AdViewBinder, SomeAnotherViewBinder and register them in your adapter. See the Step 1 and the Step 2.

FYI: EndlessScrollListener - it is your implementation of LoadMoreListener

Enjoy! :)

If you need more details please see wiki-pages: Simple Items, Composite Items, Load More Indicator.

来源：https://stackoverflow.com/questions/49345312/android-two-way-view-horizontal-recyclerview-inside-vertical-recyclerview

标签

android