安卓弹性刷新通用版—支持任何view上下刷新均有弹性效果

做安卓开发的朋友们，不知道你们会不会经常用遇到这样的情景，某个做所畏的产品设计的sb,拿着iphone来看给你看，说看苹果的这个效果多好，看那个效果多好。苹果也比安卓清晰多了，你能不能也把咱们的安卓应用也做成这种效果的。那样的用户体验更好，更cool一些。不知你们有没有遇到过这样半吊子的sb设计，反正我是遇到了。所以本文由此而生。

进入正题：首先你要实现弹性效果的view要能确定什么时候应该出现下拉的效果，什么时候出现下推的效果。在代码里的体现就是你要实现IScrollOverable接口。本文中的例子就拿GridView来做个例子。

无图无真相：

  

实现了IScrollOverable接口的GridView：

 

public class BshSOGridView extends GridView implements                 IScrollOverable {         public BshSOGridView(Context context, AttributeSet attrs,                         int defStyle)         {                super( context, attrs, defStyle );        }            public BshSOGridView(Context context, AttributeSet attrs)         {                 super( context, attrs );         }          public BshSOGridView(Context context)       {                 super( context );       }          @Override         public boolean isScrollOnTop()         {               return 0 == getFirstVisiblePosition() ? true : false;         }         @Override         public boolean isScrollOnBtm()         {                 return (getCount() - 1) == getLastVisiblePosition() ? true : false;         } }

调用Activity:

public class BshSOViewActivity extends Activity {           BshElasticView ev;  　　　　 BshSOGridView gv;         GridAdagper ga = new GridAdagper();         @Override         public void onCreate(Bundle savedInstanceState)         {                 super.onCreate( savedInstanceState );                 setContentView( R.layout.elastic_grid );                 ev = ( BshElasticView ) findViewById( R.id.ev );                 //拉动幅度                 ev.setFactor( 2 );                 //拉动范围                 ev.setMaxElastic( 0.9f );                gv = new BshSOGridView( this );                 gv.setBackgroundColor( Color.WHITE );                 gv.setNumColumns( 4 );                 gv.setAdapter( ga );                 ev.setScrollOverable( gv );                ev.irefresh = new IRefresh()                 {                         @Override                         public boolean refreshTop()                         {                                 new Thread( new Runnable()                                 {                                        @Override                                         public void run()                                         {                                                 try                                                 {                                                        Log.d( "bsh", "refreshing" );                                                         //在这里做刷新操作读数据神马的。这里用睡觉代替                                                        Thread.sleep( 3000 );                                                  } catch ( InterruptedException e )                                                 {                                                         e.printStackTrace();                                                 }                                                 ev.onRefreshComplete();                                         }                                 } ).start();                                 return false;                         }                          @Override                         public boolean refreshBtm()                　　      {                                 new Thread( new Runnable()                                 {                                         @Override                                         public void run()                                         {                                                try                                                 {                                                        Log.d( "bsh", "refreshing" );                                                         Thread.sleep( 3000 );                                                 } catch ( InterruptedException e )                                                 {                                                        e.printStackTrace();                                                }                                                 ev.onRefreshComplete();                                         }                                 } ).start();                                return false;                         }                 };         }          class GridAdagper extends BaseAdapter         {                 @Override<br>                public int getCount()                 {    <br>                    return 100;                 }                 @Override                public Object getItem(int arg0)                 {                         return null;                 }                 @Override                 public long getItemId(int arg0)                 {                         return 0;                 }                  @Override                 public View getView(int arg0, View arg1, ViewGroup arg2)                 {                         if ( null == arg1 )                         {                                arg1 = new ImageView( BshSOViewActivity.this );                                 arg1.setBackgroundResource( R.drawable.ic_launcher );                         }                         return arg1;                 }         } } 转载自：http://www.cnblogs.com/vus520/archive/2012/06/06/2561988.html