SwipeRefreshLayout下拉刷新

1.SwipeRefreshLayout是Google在support v4 19.1版本的library更新的一个下拉刷新组件，实现刷新效果更方便。

//设置刷新控件圈圈的颜色
swipe_refresh_layout.setColorSchemeResources(android.R.color.holo_blue_light, android.R.color.holo_orange_light, android.R.color.holo_red_light, android.R.color.holo_green_light);
//设置刷新控件背景色
swipe_refresh_layout.setProgressBackgroundColorSchemeColor(getResources().getColor(android.R.color.white));
//设置滑动距离
swipe_refresh_layout.setDistanceToTriggerSync(100);
//设置大小模式
swipe_refresh_layout.setSize(SwipeRefreshLayout.DEFAULT);
//设置下拉刷新控件状态隐藏
swipe_refresh_layout.setRefreshing(false);

2.在xml文件中引用android.support.v4.widget.SwipeRefreshLayout控件，在里面可以放置任何一个控件，例如ListView，gridview等。

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent" >  
  
    <android.support.v4.widget.SwipeRefreshLayout  
        android:id="@+id/id_swipe_ly"  
        android:layout_width="match_parent"  
        android:layout_height="match_parent" >  
  
        <ListView  
            android:id="@+id/id_listview"  
            android:layout_width="match_parent"  
            android:layout_height="match_parent" >  
        </ListView>  
    </android.support.v4.widget.SwipeRefreshLayout>  
  
</RelativeLayout>

3.Java代码

public class MainActivity extends Activity implements SwipeRefreshLayout.OnRefreshListener {

	private SwipeRefreshLayout swipeLayout;
	private ListView listView;
	private ListViewAdapter adapter;
	private List<ItemInfo> infoList;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		swipeLayout = (SwipeRefreshLayout) this.findViewById(R.id.swipe_refresh);
		swipeLayout.setOnRefreshListener(this);
		
		// 顶部刷新的样式
		swipeLayout.setColorScheme(android.R.color.holo_red_light, android.R.color.holo_green_light,
				android.R.color.holo_blue_bright, android.R.color.holo_orange_light);

		infoList = new ArrayList<ItemInfo>();
		ItemInfo info = new ItemInfo();
		info.setName("coin");
		infoList.add(info);
		listView = (ListView) this.findViewById(R.id.listview);
		adapter = new ListViewAdapter(this, infoList);
		listView.setAdapter(adapter);
	}

	public void onRefresh() {
		new Handler().postDelayed(new Runnable() {
			public void run() {
				swipeLayout.setRefreshing(false);
				ItemInfo info = new ItemInfo();
				info.setName("coin-refresh");
				infoList.add(info);
				adapter.notifyDataSetChanged();
			}
		}, 500);
	}
}