RecyclerView 上拉加载更多

作者: Kevin_Zhou | 来源:发表于2016-11-14 10:38 被阅读0次

    Recyclerview 是谷歌官方推荐的新的列表控件,网上关于recyclerview的用法也颇有深度,她有自带的SwipeRefreshLayout 可很好的提供下拉刷新,唯独没有上拉加载控件,
    需要使用的一般都采用其他的方法,这里,有一篇关于RecyclerView的上拉加载的文章,
    直接上代码:
    /**

    • Created by Kevin_zhou on 2016/11/11.
      */
      public class TulingAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

      private static final int TYPE_ZIJI_ITEM = 0; //普通Item
      private static final int TYPE_FOOTER_ITEM = 1; //底部FooterView
      private static final int TYPE_TULING = 2;

      //上拉加载更多
      public static final int PULLUP_LOAD_MORE = 1;
      //正在加载中
      public static final int LOADING_MORE = 2;
      //默认为0
      private int load_more_status = 1;

      public List<TulingBean> list;
      private OnItemClickListener mClickListener;

      public void setData(List<TulingBean> list){
      this.list = list;
      }

      //创建新View,被LayoutManager所调用
      @Override
      public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
      //如果viewType是普通item返回普通的布局,否则是底部布局并返回
      if (viewType == TYPE_ZIJI_ITEM) {
      View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout
      .cardview_recyclerview_item, viewGroup, false);
      final ZiJiViewHolder vh = new ZiJiViewHolder(view);
      if (mClickListener != null) {
      vh.itemView.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
      mClickListener.onItemClick(vh.itemView, vh.getLayoutPosition());
      }
      });
      }
      return vh;
      } else if (viewType == TYPE_TULING) {
      View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.char_tuling, viewGroup, false);
      final TuLingViewHolder holder = new TuLingViewHolder(view);
      if (mClickListener != null) {
      holder.itemView.setOnClickListener(new View.OnClickListener() {

                   @Override
                   public void onClick(View view) {
                       mClickListener.onItemClick(holder.itemView, holder.getLayoutPosition());
                   }
               });
           }
           return holder;
       } else {
           View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout
                   .recyclerview_footer_view, viewGroup, false);
           FooterViewHolder vh = new FooterViewHolder(view);
           return vh;
       }
      

      }

      //将数据与界面进行绑定的操作
      @Override
      public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {
      if (viewHolder instanceof ZiJiViewHolder) {
      ((ZiJiViewHolder) viewHolder).contentTv.setText(list.get(position).getContent());
      } else if (viewHolder instanceof TuLingViewHolder){
      ((TuLingViewHolder) viewHolder).contentTv.setText(list.get(position).getContent());
      }
      else if (viewHolder instanceof FooterViewHolder) {
      FooterViewHolder footViewHolder = (FooterViewHolder) viewHolder;
      switch (load_more_status) {
      case PULLUP_LOAD_MORE:
      footViewHolder.foot_view_item_tv.setVisibility(View.VISIBLE);
      footViewHolder.foot_view_item_tv.setText("上拉加载更多");
      footViewHolder.pb.setVisibility(View.GONE);
      break;
      case LOADING_MORE:
      footViewHolder.foot_view_item_tv.setVisibility(View.GONE);
      footViewHolder.pb.setVisibility(View.VISIBLE);
      break;
      }
      }
      }

      @Override
      public int getItemCount() {
      //+1是加入底部的加载布局项
      return list.size() + 1;
      }

      public int getItemViewType(int position) {
      // 如果position+1等于整个布局所有数总和就是底部布局
      if (position + 1 == getItemCount()) {
      return TYPE_FOOTER_ITEM;
      } else {
      if (list.get(position).getType() == 1){
      return TYPE_TULING;
      }else {
      return TYPE_ZIJI_ITEM;
      }
      }
      }

      //自定义的ViewHolder,持有每个Item的的所有界面元素
      public static class ZiJiViewHolder extends RecyclerView.ViewHolder {
      public TextView contentTv;
      public ImageView iv;

       public ZiJiViewHolder(View view) {
           super(view);
           contentTv = (TextView) view.findViewById(R.id.tv_chat_me);
           iv = (ImageView) view.findViewById(R.id.iv_chat_me);
       }
      

      }

      //图灵布局
      public static class TuLingViewHolder extends RecyclerView.ViewHolder {
      public TextView contentTv;
      public ImageView iv;

       public TuLingViewHolder(View view) {
           super(view);
           contentTv = (TextView) view.findViewById(R.id.tv_chat_tu);
           iv = (ImageView) view.findViewById(R.id.iv_chat_tu);
       }
      

      }

      /**

      • 底部FooterView布局
        */
        public static class FooterViewHolder extends RecyclerView.ViewHolder {
        public TextView foot_view_item_tv;
        public ProgressBar pb;

        public FooterViewHolder(View view) {
        super(view);
        pb = (ProgressBar) view.findViewById(R.id.progress_view);
        foot_view_item_tv = (TextView) view.findViewById(R.id.tv_content);
        }
        }

      public void setMoreStatus(int status){
      load_more_status=status;
      notifyDataSetChanged();
      }

      public void setOnItemClickListener(OnItemClickListener listener) {
      mClickListener = listener;
      }

    public interface OnItemClickListener {
        public void onItemClick(View itemView, int pos);
    }
    

    }

    上面是RecyclerView适配器,就是对RecyclerView滚动监听,请看下面如何使用

    mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    private int lastVisibleItem;

            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if (!swipeRefreshWidget.isRefreshing()) {
                    if (newState == RecyclerView.SCROLL_STATE_IDLE && lastVisibleItem + 1 ==
                            adapter.getItemCount()) {
                        swipeRefreshWidget.setEnabled(false);
                        adapter.setMoreStatus(PullMoreRecyclerAdapter.LOADING_MORE);
                        new Handler().postDelayed(new Runnable() {
                            @Override
                            public void run() {
                                getDatas();
                                swipeRefreshWidget.setEnabled(true);
                                adapter.setMoreStatus(PullMoreRecyclerAdapter.PULLUP_LOAD_MORE);
                                adapter.notifyDataSetChanged();
                            }
                        }, 3000);
                    }
                }
            }
    
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();
            }
        });
    

    如有疑问,欢迎提出。

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