有弹性的ListView

package com.weichuang.china.video.view;import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.TranslateAnimation;
import android.widget.ListView;public class MyListView extends ListView {private Context context;private boolean outBound = false;private int distance;private int firstOut;  public MyListView(Context context, AttributeSet attrs) {super(context, attrs);this.context = context;}public MyListView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);this.context = context;}public MyListView(Context context) {super(context);this.context = context;}GestureDetector gestureDetector = new GestureDetector(new OnGestureListener() {public boolean onSingleTapUp(MotionEvent e) {// TODO Auto-generated method stubreturn false;}public void onShowPress(MotionEvent e) {// TODO Auto-generated method stub}public boolean onScroll(MotionEvent e1, MotionEvent e2,float distanceX, float distanceY) {int firstPos = getFirstVisiblePosition();int lastPos = getLastVisiblePosition();int itemCount = getCount();// outbound Topif (outBound && firstPos != 0 && lastPos != (itemCount - 1)) {scrollTo(0, 0);return false;}View firstView = getChildAt(firstPos);if (!outBound)firstOut = (int) e2.getRawY();if (firstView != null&& (outBound || (firstPos == 0&& firstView.getTop() == 0 && distanceY < 0))) {// Record the length of each slidedistance = firstOut - (int) e2.getRawY();scrollTo(0, distance / 2);return true;}if (lastPos != (itemCount - 1))return false;View lastView = getChildAt(lastPos - firstPos);int GridHeight = getHeight(); if (lastView != null && (outBound || ((lastView.getBottom() + 8) >= GridHeight && distanceY > 0))) { distance = firstOut - (int) e2.getRawY();scrollTo(0, distance);return true;} return false;}public void onLongPress(MotionEvent e) {// TODO Auto-generated method stub}public boolean onFling(MotionEvent e1, MotionEvent e2,float velocityX, float velocityY) {// TODO Auto-generated method stubreturn false;}public boolean onDown(MotionEvent e) {// TODO Auto-generated method stubreturn false;}});@Overridepublic boolean dispatchTouchEvent(MotionEvent event) {int act = event.getAction();if ((act == MotionEvent.ACTION_UP || act == MotionEvent.ACTION_CANCEL)&& outBound) {outBound = false;}if (!gestureDetector.onTouchEvent(event)) {outBound = false;} else {outBound = true;}Rect rect = new Rect();getLocalVisibleRect(rect);TranslateAnimation am = new TranslateAnimation(0, 0, -rect.top, 0);am.setDuration(300);startAnimation(am);scrollTo(0, 0);return super.dispatchTouchEvent(event);}
}

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