SwipeRefreshLayout实现下拉刷新，下拉加载

SwipeRefreshLayout可以包裹一些组件，比如recyclerview,listview,webview等，实现下拉刷新，上拉加载

实例：

布局文件：

<android.support.v4.widget.SwipeRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"

android:id="@+id/swipe_refresh_widget">

<android.support.v7.widget.RecyclerView
android:id="@+id/my_recycler_view"
android:scrollbars="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"/>

</android.support.v4.widget.SwipeRefreshLayout>

actity中，主要是设置刷新监听，刷新结束时，调用

setRefreshing(false);

隐藏刷新进度条

public class WaterfallActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {

private SwipeRefreshLayout mSwipeRefreshWidget;

@Override
protected void onCreate(Bundle savedInstanceState)  {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

......

mSwipeRefreshWidget = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_widget);

mSwipeRefreshWidget.setOnRefreshListener(this);

}

private static final int REFRESH_COMPLETE = 0X110;

private  Handler mHandler = new Handler()
{
public void handleMessage(android.os.Message msg)
{
switch (msg.what)
{
case REFRESH_COMPLETE:
//mDatas.addAll(Arrays.asList("Lucene", "Canvas", "Bitmap"));
//mAdapter.notifyDataSetChanged();
mSwipeRefreshWidget.setRefreshing(false);
break;

}
};
};

@Override
public void onRefresh() {
mHandler.sendEmptyMessageDelayed(REFRESH_COMPLETE, 2000);
}

public class SpaceItemDecoration extends RecyclerView.ItemDecoration{
private int miSpace;
public SpaceItemDecoration(int iSpace)
{
miSpace = iSpace;
}

}