Question

我想通过单击底部更改所有项目视图RecyclerView 我只是更改视图类型变量并调用notifyDataSetChanged() 通知适配器，但不做任何更改

private void ChangeAdapterView(){

    if (viewType==0) {
        StuffAdapter.ViewType=++viewType;
        recyclerView.getAdapter().notifyDataSetChanged();
    }
    else if (viewType==1){
        viewType=0;
        StuffAdapter.ViewType=viewType;
        recyclerView.getAdapter().notifyDataSetChanged();
    }
}

注意：：我使用灵活的布局，不需要更改跨度大小我只想更改视图

public class StuffAdapter extends RecyclerView.Adapter< StuffAdapter.ViewHolder> {

private final Realm realm;
private final String base;
public  static int ViewType=0;

    public static void setViewType(int viewType) {
        ViewType = viewType;
    }

    Picasso picasso;
    Context context;
    StoreView communicator;
    SessionManager sessionManager;
    List<StuffPOJO> data;
    int sellerId;
    public StuffAdapter(@Nullable List<StuffPOJO> data,
                        Picasso picasso, Context context,StoreView communicator) {
        this.context=context;
        this.picasso=picasso;
        this.data=data;
        base=context.getResources().getString(R.string.base_url);
        this.communicator=communicator;
        sessionManager=new SessionManager(context);
        sellerId = sessionManager.getSellerId();
    }

    @NonNull
    @Override
    public StuffAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        if (viewType==0)
            return new StuffAdapter.ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_stuff1, parent, false));
        else
            return new StuffAdapter.ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_stuff2, parent, false));
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        StuffPOJO obj = getItem(position);
        holder.bindView(obj);
    }
    @Override
    public int getItemCount() {
        return data.size();
    }

    @Nullable
    public StuffPOJO getItem(int index) {
        return  data.get(index);
    }

    public void updateData(@Nullable List<StuffPOJO> list) {
        Timber.w("updateData :" + list.size());
        int size=this.data.size()+1;
        data.addAll(list);
        notifyItemRangeInserted(size,list.size());
    }
    public  void reSetData(@Nullable List<StuffPOJO> list){
        data.clear();
        data.addAll(list);
        notifyDataSetChanged();
    }


    @Override
    public int getItemViewType(int position) {
        return ViewType;
    }
}

答案最好将静态变量用于参考视图类型，以免像这样的错误link

private void ChangeAdapterView(){

    if (viewType==0) {
        viewType++;
        stuffAdapter.setViewType(StuffAdapter.LAYOUT_ITEM_LANDSCAPE);
        stuffAdapter.notifyDataSetChanged();

    }
    else if (viewType==1){
        viewType=0;
        stuffAdapter.setViewType(StuffAdapter.LAYOUT_ITEM_PORTRAIN);
        stuffAdapter.notifyDataSetChanged();
    }
}

Answer 1

       public StuffAdapter(@Nullable List<StuffPOJO> data,Picasso picasso, Context context,StoreView communicator, int viewType) {
        this.context=context;
        this.picasso=picasso;
                this.data=data;
                ***this.ViewType = viewtype; // pass int*** 
                base=context.getResources().getString(R.string.base_url);
                this.communicator=communicator;
                sessionManager=new SessionManager(context);
                sellerId

     = sessionManager.getSellerId();
        }

然后调用适配器。

Answer 2

我为此做了一个图书馆：

https://github.com/sajadshokri/GhostAdapter

动态添加支持的视图类型：

public void putViewType(@LayoutRes int layout, Class<? extends RecyclerView.ViewHolder> holder) {
        this.viewTypes.put(layout, holder);
    }

并根据视图类型制作相关的viewholder

viewTypes.get(viewType).getConstructor(View.class).newInstance(view)

OR

只需使用该库。

Answer 3

最好将静态变量用于视图类型，以避免像这样的错误link

private void ChangeAdapterView(){

    if (viewType==0) {
        viewType++;
        stuffAdapter.setViewType(StuffAdapter.LAYOUT_ITEM_LANDSCAPE);
        stuffAdapter.notifyDataSetChanged();

    }
    else if (viewType==1){
        viewType=0;
        stuffAdapter.setViewType(StuffAdapter.LAYOUT_ITEM_PORTRAIN);
        stuffAdapter.notifyDataSetChanged();
      }
     }

动态更改视图类型RecylerView

3 个答案: