RecyclerView添加下拉刷新和上拉加载更多

在google的android.support.v4包中，提供一个SwipeRefreshLayout方法， 用于实现下拉刷新。

在主布局中的文件：加入以下代码：

<android.support.v4.widget.SwipeRefreshLayout
    android:id="@+id/layout_swipe_refresh"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </android.support.v7.widget.RecyclerView>
</android.support.v4.widget.SwipeRefreshLayout>

在Activity中
实现以下核心代码：
SwipeRefreshLayout.OnRefreshListener， 并且在这个口里面提供了一个抽象方法：onRefresh（）， 到这里， 我们大概知道它是怎么运作的了，我们只需要在Activity中，实现这个接口，并且实现OnRefresh()方法即可，在onReflesh()方法中，进行我们的刷新数据操作

public class Fragment1 extends Fragment {
    int isXx=0;
    private RecyclerView rv;
    ArrayList<String> list=new ArrayList<>();
    private MyAdapter md;
    Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if (msg.what==1){
                sw.setRefreshing(false);
                md.RemoveView(0);
            }
            if (msg.what==0){
                md.addMoreItem(newDatas);
                md.Abb2();
                isXx=0;
            }
        }
    };
    private SwipeRefreshLayout sw;
    private List<String> newDatas;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment1, null);
        rv = (RecyclerView) v.findViewById(R.id.rv);
        sw = (SwipeRefreshLayout) v.findViewById(R.id.sw);
        //设置刷新时动画的颜色，可以设置4个
        sw.setProgressBackgroundColorSchemeResource(android.R.color.white);
        sw.setColorSchemeResources(android.R.color.holo_blue_light,
                android.R.color.holo_red_light,android.R.color.holo_orange_light,
                android.R.color.holo_green_light);
        sw.setProgressViewOffset(false, 0, (int) TypedValue
                .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 24, getResources()
                        .getDisplayMetrics()));
        sw.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                //数据重新加载完成后，提示数据发生改变，并且设置现在不在刷新
                md.addItem("刷新了");
                sw.setRefreshing(true);
                handler.sendEmptyMessageDelayed(1,2000);
            }
        });
        rv.setOnScrollListener(new RecyclerView.OnScrollListener() {

            private int lastVisibleItemPosition;

            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if (isXx==0&&newState ==RecyclerView.SCROLL_STATE_IDLE && lastVisibleItemPosition+1==md.getItemCount())  {
                    isXx=1;
                    newDatas = new ArrayList<String>();
                    for (int i = 0; i < 4; i++) {
                        int index = i + 1;
                        newDatas.add("more item" + index);
                    }
                    md.Abb();
                    handler.sendEmptyMessageDelayed(0, 2000);
                }

            }
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView,dx, dy);
                RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
                lastVisibleItemPosition = ((LinearLayoutManager) layoutManager).findLastVisibleItemPosition();
            }
        });
        for (int i = 0; i < 4; i++) {
            list.add("a"+i);
        }
        /*rv.setLayoutManager(new StaggeredGridLayoutManager(4, StaggeredGridLayoutManager.VERTICAL) );*/
        rv.setLayoutManager(new LinearLayoutManager(getActivity()));
        rv.setItemAnimator(new DefaultItemAnimator());
        md = new MyAdapter(getActivity(),list);
        rv.setAdapter(md);
        md.setOnItemClickListener(new MyAdapter.onItemClickListerner() {
            @Override
            public void onItemClick(View view, int position) {
                md.AddView(position);
            }

            @Override
            public void onLongItemClick(View view, int position) {
                md.RemoveView(position);
            }
        });
        return v;
    }
}

适配器代码：public class MyAdapter extends

RecyclerView.Adapter<RecyclerView.ViewHolder> {
    ArrayList<String> list = new ArrayList<String>();
    private List<Integer> mHeights;
    Context context;
    private onItemClickListerner listener;
    private MyViewHolder2 h2;

    public MyAdapter(Context ctx, ArrayList<String> list) {
        this.context = ctx;
        this.list = list;
        mHeights = new ArrayList<Integer>();
        for (int i = 0; i < list.size(); i++) {
            mHeights.add((int) (150 + Math.random() * 300));
        }
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        if (viewType == 1) {
            MyViewHolder holder = new MyViewHolder(LayoutInflater.from(
                    context).inflate(R.layout.listitme, parent,
                    false));
            return holder;
        } else if (viewType == 0) {
            MyViewHolder2 holder2 = new MyViewHolder2(LayoutInflater.from(
                    context).inflate(R.layout.listitem2, parent,
                    false));
            return holder2;
        }
        return null;
    }

    @Override
    public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {
        if (holder instanceof MyViewHolder) {
            /*ViewGroup.LayoutParams lp=holder.tv.getLayoutParams();
            lp.height=mHeights.get(position);
            holder.tv.setLayoutParams(lp);*/
            final MyViewHolder h = (MyViewHolder) holder;
            h.tv.setText(list.get(position));
            if (listener != null) {
                holder.itemView.setOnClickListener(new View.OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        int pos = h.getAdapterPosition();
                        listener.onItemClick(h.itemView, pos);
                    }
                });
                holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {

                    @Override
                    public boolean onLongClick(View v) {
                        int pos = h.getAdapterPosition();
                        listener.onLongItemClick(h.itemView, pos);
                        return false;
                    }
                });
            }

        } else if (holder instanceof MyViewHolder2){
            h2 = (MyViewHolder2) holder;
        }
    }

    @Override
    public int getItemCount() {
        return list.size() + 1;
    }

    @Override
    public int getItemViewType(int position) {
        // 最后一个item设置为footerView
        if (position + 1 == getItemCount()) {
            return 0;
        } else {
            return 1;
        }
    }

    class MyViewHolder extends RecyclerView.ViewHolder {

        TextView tv;

        public MyViewHolder(View view) {
            super(view);
            tv = (TextView) view.findViewById(R.id.tv);

        }
    }

    class MyViewHolder2 extends RecyclerView.ViewHolder {

        ProgressBar tvv;

        public MyViewHolder2(View view) {
            super(view);
            tvv = (ProgressBar) view.findViewById(R.id.bar);

        }
    }

    public interface onItemClickListerner {
        void onItemClick(View view, int position);

        void onLongItemClick(View view, int position);
    }

    public void setOnItemClickListener(onItemClickListerner listener) {
        this.listener = listener;
    }

    public void RemoveView(int position) {
        list.remove(position);
        notifyItemRemoved(position);
    }

    public void AddView(int position) {
        list.add("b" + position);
        notifyItemInserted(position);
    }

    //添加数据
    public void addItem(String newDatas) {
        list.add(0, newDatas);
        notifyDataSetChanged();
    }

    public void addMoreItem(List<String> newDatas) {
        list.addAll(newDatas);
        notifyDataSetChanged();
    }
    public void Abb(){
        h2.tvv.setVisibility(View.VISIBLE);
    }
    public void Abb2(){
        h2.tvv.setVisibility(View.GONE);
    }
}


参考网址：http://blog.youkuaiyun.com/developer_jiangqq/article/details/49992269