相信大家在使用淘寶的時候應該都看到過下拉重新整理的效果。這種效果看起來會感覺比較難做，一起來看下下拉重新整理。

ListView

思路：
通過FrameLayout底層為下拉重新整理的Header，上面一層是ListView，監聽手指滑動設定動畫效果，移動ListView。
使用：
1、編寫ListView頂部下拉重新整理的header

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width
 
="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <TextView 
         android:layout_width="match_parent"
         android:gravity="center"
    android:layout_height="wrap_content"
    android:text="下拉重新整理"
        />

</LinearLayout>

2、ListView(後面將會進行動態新增)

<?xml version="1.0" encoding="utf-8"?>
<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:background="#ffffff">
</ListView>

3、自定義FrameLayout動態新增ListView與header

public class
 
 MyFrameLayout extends FrameLayout{
    ListView listview;
    public MyFrameLayout(Context context) {
        super(context);
        }
    public MyFrameLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        //先建立LayoutInflater 用於獲得佈局
        LayoutInflater inflater=(LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                //新增頂部佈局
        View header=inflater.inflate(R.layout.header, null);
        //向佈局中新增header（下拉載入）
        addView(header);
        //ListView的Adapter
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(context, android.R.layout.simple_list_item_1,new String[]{"a","b","c","d","e","f","g","h","i","j","k","l","m","n"});

        listview=(ListView) inflater.inflate(R.layout.mylistview, null);
        listview.setAdapter(adapter);
           //向佈局中新增ListView
        addView(listview);

    }

    //攔截事件
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {

        if(ev.getAction()==MotionEvent.ACTION_DOWN){

        }
        if(listview.getFirstVisiblePosition()==0){
            View firstview=listview.getChildAt(listview.getFirstVisiblePosition());
            if(firstview.getY()>=0){

                return true;

            }

        }

        return super.onInterceptTouchEvent(ev);
    }
    //設定動畫時使用
    private float oldy;
    //處理事件
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Log.d("onTouchEvent", ""+super.onTouchEvent(event));
        switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
        //手指落下監聽
            oldy=event.getY();

        case MotionEvent.ACTION_MOVE:
            float y=event.getY();
            float distance=y-oldy;
            //設定listview移動
                listview.setTranslationY(listview.getTranslationY()+distance);          
            oldy=y;
            invalidate();

            return true;

        case MotionEvent.ACTION_UP:
        //手指擡起時，設定動畫效果，使ListView回到頂部
            ObjectAnimator.ofFloat(listview, "translationY", listview.getTranslationY(),0).setDuration(300).start();

            break;
        default:
            break;
        }
        return super.onTouchEvent(event);
    }
}

4、佈局引用

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <com.example.administrator.myapplication2.MyFrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        >
    </com.example.administrator.myapplication2.MyFrameLayout>

</LinearLayout>

5、在MainActivity中使用該佈局即可。

SwipeRefreshLayout

　　實際上Android已經為我們實現一種下拉重新整理，那就是通過SwipeRefreshLayout，看下新出的SwipeRefreshLayout的實現方式。
使用：
1、佈局
注：SwipeRefreshLayout類似於ScrollView，內部只能有一個元件。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

  <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/swiperefresh"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <ListView
            android:id="@+id/listview2"
            android:layout_width="match_parent"
            android:layout_height="match_parent" >
        </ListView>
    </android.support.v4.widget.SwipeRefreshLayout>

</LinearLayout>

2、MainActivity

public class MainActivity extends Activity {
    private SwipeRefreshLayout refresh;
    private ListView mlistview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        mlistview=(ListView) findViewById(R.id.listview2);
        refresh=(SwipeRefreshLayout) findViewById(R.id.swiperefresh);
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,new String[]{"a","b","c","d","e","f","g","h","i","j","k","l","m","n"});
        mlistview.setAdapter(adapter);
        //設定監聽事件
        refresh.setOnRefreshListener(new OnRefreshListener() {

            @Override
            public void onRefresh() {

                refresh.setRefreshing(false);
            }
        });

    }

}