因为利用系统控件，实现非常简单，所以直接进入主题，下面是布局文件：
<view
android:id="@+id/swipeRefreshLayout"
class="android.support.v4.widget.SwipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</view>
这里被SwipeRefreshLayout 包裹的布局，就可以使用下拉刷新，
Activity操作：

  private SwipeRefreshLayout swipeRefreshLayout;
  swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);
  swipeRefreshLayout.setColorSchemeColors(Color.RED);//这里设置刷新图标颜色
         swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {
            //重新获取数据
            //获取完成swipeRefreshLayout.setRefreshing(false);
            new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        Thread.sleep(2000);//为了模拟刷新，2秒后刷新完成。
                        handler.sendEmptyMessage(0);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }).start();
        }
    });

   Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        swipeRefreshLayout.setRefreshing(false);
    }
};
```