Android自带的下拉刷新组件SwipeRefreshLayout，,也许之前下拉刷新你可能会

Android自带的下拉刷新组件SwipeRefreshLayout，,也许之前下拉刷新你可能会

也许之前下拉刷新你可能会用到一些第三方开源库，如PullToRefresh,ActionBar-PullToRefresh等，但现在已经有官方的组件了---SwipeRefreshLayout，SwipeRefreshLayout是Google在supportv419.1版本的library更新的一个下拉刷新组件，使用起来很方便，可以很方便的实现GoogleNow的刷新效果。使用官方自带的控件能够保证通用性以及风格。SwipeRefreshLayout是继承ViewGroup，来实现下拉刷新，它可以包含其他组件，使用过后感觉很简单。```xml <RelativeLayout 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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.myapplication2.app.MainActivity">

    <android.support.v4.widget.SwipeRefreshLayout          android:id="@+id/swip"          android:layout_width="match_parent"          android:layout_height="match_parent">          <ListView              android:id="@+id/listview"              android:layout_width="match_parent"              android:layout_height="match_parent">            </ListView>          </android.support.v4.widget.SwipeRefreshLayout></RelativeLayout>

```java    import android.os.Handler;      import android.os.Message;      import android.support.v7.app.ActionBarActivity;      import android.support.v4.widget.SwipeRefreshLayout;      import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;      import android.os.Bundle;      import android.view.Menu;      import android.view.MenuItem;      public class MainActivity extends ActionBarActivity implements OnRefreshListener{          private SwipeRefreshLayout swipeRefreshLayout;          Handler handler = new Handler(){              @Override              public void handleMessage(Message msg) {                  super.handleMessage(msg);                  swipeRefreshLayout.setRefreshing(false);              }          };          @Override          protected void onCreate(Bundle savedInstanceState) {              super.onCreate(savedInstanceState);              setContentView(R.layout.activity_main);              swipeRefreshLayout = (SwipeRefreshLayout)findViewById(R.id.swip);              swipeRefreshLayout.setOnRefreshListener(this);              swipeRefreshLayout.setColorScheme(android.R.color.holo_blue_bright,                      android.R.color.holo_green_light,                      android.R.color.holo_orange_light,                      android.R.color.holo_red_light);          }          @Override          public void onRefresh() {              handler.sendEmptyMessageDelayed(1, 5000);          }      }  

在上面的onRefresh()函数中实现获取数据功能以及更新数据，当更新完数据后，调用swipeRefreshLayout.setRefreshing(false);来关闭刷新。