RecycylerView 实现下拉刷新，上拉加载（简单版）

一、下拉刷新

Xml文件中添加SwipeReFreshLayout

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

MainActivity中添加setOnReFreshLayoutListener就可以了

mRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.refresh_layout);
mRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
      @Override
      public void onRefresh() {
            Toast.makeText(MainActivity.this,"下拉刷新成功",Toast.LENGTH_SHORT).show();
            mRefreshLayout.setRefreshing(false);
      }
});

二、上拉加载

给recyclerview添加OnscrollListener

recyclerview的状态有：

空闲状态： SCROLL_STATE_IDLE 
滑动状态： SCROLL_STATE_TOUCH_SCROLL 
惯性滑动状态： SCROLL_STATE_FLING

        private RecyclerView recyclerView;
        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
                if(newState == RecyclerView.SCROLL_STATE_IDLE){
                    int lastVisiblePosition = linearLayoutManager.findLastVisibleItemPosition();
                    if(lastVisiblePosition >= linearLayoutManager.getItemCount() - 1){
                        Toast.makeText(MainActivity.this,"上拉加载成功",Toast.LENGTH_SHORT).show();
                    }
                }
            }
        });