Adnroid 类似iPhone的弹性ListView滚动
从2.3开始，android开始支持listview的overscroll, 应该很方便可以做出类似iPhone的弹性滚动，及越过list顶端或者底端，然后弹性滚回。大致如下：

package com.iaiai.activity;import android.content.Context;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.widget.ListView;/** *  * <p> * Title: BounceListView.java * </p> * <p> * E-Mail: 176291935@qq.com * </p> * <p> * QQ: 176291935 * </p> * <p> * Http: iaiai.iteye.com * </p> * <p> * Create time: 2011-12-30 下午3:07:49 * </p> *  * @author 丸子 * @version 0.0.1 */public class BounceListView extends ListView {private static final int MAX_Y_OVERSCROLL_DISTANCE = 500;private Context mContext;private int mMaxYOverscrollDistance;public BounceListView(Context context) {super(context);mContext = context;initBounceListView();}public BounceListView(Context context, AttributeSet attrs) {super(context, attrs);mContext = context;initBounceListView();}public BounceListView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);mContext = context;initBounceListView();}private void initBounceListView() {// get the density of the screen and do some maths with it on the max// overscroll distance// variable so that you get similar behaviors no matter what the screen// sizefinal DisplayMetrics metrics = mContext.getResources().getDisplayMetrics();final float density = metrics.density;mMaxYOverscrollDistance = (int) (density * MAX_Y_OVERSCROLL_DISTANCE);}@Overrideprotected boolean overScrollBy(int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX,int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {// This is where the magic happens, we have replaced the incoming// maxOverScrollY with our own custom variable mMaxYOverscrollDistance;return super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX, scrollRangeY, maxOverScrollX,mMaxYOverscrollDistance, isTouchEvent);}}