Question

notigyDataSetChanged不起作用！在notifyDataSetChanged方法之后，适配器中的列表仍为空。

MainActivity：

//left menu
mRvLeftMenu = (RecyclerView) mSlidingMenu.findViewById(R.id.rv_left_menu);
//set layout manager
mRvLeftMenu.setLayoutManager(new LinearLayoutManager(this));
//init list
mSlidingData = new ArrayList<>();
mLeftMenuAdapter = new LeftMenuAdapter(this, mSlidingData);
//set adapter
mRvLeftMenu.setAdapter(mLeftMenuAdapter);


@Override
public void onLoadFinished(int requestType, BaseResultBean resultBean) {
    switch (requestType) {
        case MyConstants.REQUEST_RESULT_NEWS_CENTER:
            List<NewsResultBean.DataBean> list = ((NewsResultBean) resultBean).getData();

效果很好

//                mLeftMenuAdapter = new LeftMenuAdapter(this, list);
//                mRvLeftMenu.setAdapter(mLeftMenuAdapter);

如果我只是将数据添加到mSlidingData它没有工作，RecyclerView就不会刷新！为什么呢？

            mSlidingData.addAll(list);
            mLeftMenuAdapter.notifyDataSetChanged();

并且在notifyDataSetChanged调用之后，适配器中的mList仍为空！与贝娄相同。

            mRvLeftMenu.getAdapter().notifyDataSetChanged();
            break;
    }
}

适配器：

public class LeftMenuAdapter extends RecyclerView.Adapter<LeftMenuAdapter.VH> {
    private List<NewsResultBean.DataBean> mList;
    private Context mContext;
    private OnItemClickListener mOnItemClickListener;

    public LeftMenuAdapter(Context context, List<NewsResultBean.DataBean> list) {
        mList = list;
        mContext = context;
    }

    @Override
    public VH onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = View.inflate(mContext, R.layout.item_left_menu, null);
        return new VH(view);
    }

    @Override
    public void onBindViewHolder(final VH holder, int position) {
        holder.mTvLeftMenu.setText(mList.get(position).getTitle());
        final int tempPosition = position;
        holder.mView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mOnItemClickListener != null){
                    mOnItemClickListener.onItemClicked(v,tempPosition);
                }
            }
        });
    }

    @Override
    public int getItemCount() {
        return mList.size();
    }

    class VH extends RecyclerView.ViewHolder {
        @BindView(R.id.tv_left_menu)
        TextView mTvLeftMenu;
        View mView;
        public VH(View itemView) {
            super(itemView);
            mView = itemView;
            ButterKnife.bind(this,mView);
        }
    }

    interface OnItemClickListener{
        void onItemClicked(View view,int position);
    }

    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        mOnItemClickListener = onItemClickListener;
    }
}

Answer 1

THX为你的帮助伙伴！我犯了一个愚蠢的错误，我在网络请求后将mSlidingData更改为另一个列表。

//after network request
private void processResult(String response) {
    Gson gson = new Gson();
    NewsResultBean newsResultBean = gson.fromJson(response, NewsResultBean
            .class);
    Log.d(TAG, "onResponse: " + newsResultBean.toString());
    //pass the result data to MainActivity,changed the mSlidingData to a new list,
    //cause RecyclerView notifyDataSetChanged method not work!
//                        mActivity.setSlidingData(newsResultBean.getData());

像这样的

setSlidingData方法：

public void setSlidingData(List<NewsResultBean.DataBean> slidingData) {
    mSlidingData = slidingData;
}

RecyclerView notifyDataSetChanged不起作用，在notifyDataSetChanged方法之后，适配器中的列表仍为空

1 个答案: