Android自帶的下拉刷新組件SwipeRefreshLayout

也許之前下拉刷新你可能會用到一些第三方開源庫，如PullToRefresh, ActionBar-PullToRefresh等，但現在已經有官方的組件了 ---SwipeRefreshLayout，SwipeRefreshLayout是Google在support v4 19.1版本的library更新的一個下拉刷新組件，使用起來很方便，可以很方便的實現Google Now的刷新效果。使用官方自帶的控件能夠保證通用性以及風格。SwipeRefreshLayout是繼承ViewGroup，來實現下拉刷新，它可以 包含其他組件，使用過后感覺很簡單。

    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android&quot;

        xmlns:tools="http://schemas.android.com/tools&quot;

        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>  </pre> 



    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);  
    }  
}  </pre> 


 在上面的onRefresh()函數中實現獲取數據功能以及更新數據，當更新完數據后，調用swipeRefreshLayout.setRefreshing(false);來關閉刷新。