android 自定义具有反弹效果的ScrollView

package com.animator.view;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.BounceInterpolator;
import android.widget.ScrollView;

/**
* @desc 自定义scrollView(属性动画实现具有反弹效果的ScrollView)
* @creator caozhiqing
* @data 2016/2/19
*/
public class FlowScrollView extends ScrollView {

private View contentView;
private final float scalCount = 0.5f;//阻尼系数
private float downY;//点击时的y点
private ObjectAnimator objectAnimator;//动画
private float distanceY;//移动距离
private boolean isMoveing = false;//动画是正在进行

//    private int scrollHeight = 0;//当内容不足以全屏时，内容随手指可滑动距离

public FlowScrollView(Context context) {
super(context);
}

public FlowScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}

public FlowScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}

public FlowScrollView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}

@Override
protected void onFinishInflate() {//视图加载完成
super.onFinishInflate();
if (getChildCount() > 0) {
contentView = getChildAt(0);
//            scrollHeight = contentView.getHeight();

}
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {

return super.onInterceptTouchEvent(ev);
}

@Override
public boolean onTouchEvent(MotionEvent ev) {

if (isMoveing) {
return false;
}

switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
downY = ev.getY();
break;

case MotionEvent.ACTION_MOVE:
float deltY = ev.getY() - downY;
if (Math.abs(deltY)
4000
> 10 &&(getScrollY() == 0 || (getScrollY()+getHeight())==contentView.getHeight())) {
contentView.setY(contentView.getY() + deltY * scalCount);
distanceY += deltY * scalCount;
}
downY = ev.getY();
break;
case MotionEvent.ACTION_UP:

if (Math.abs(distanceY) > 0) {
objectAnimator = ObjectAnimator.ofFloat(contentView, "translationY", distanceY, -(float) contentView.getTop());
objectAnimator.setInterpolator(new BounceInterpolator());
objectAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
isMoveing = true;
}

@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
distanceY = 0;
isMoveing = false;
}
});
objectAnimator.setDuration(500);
objectAnimator.start();
}

break;
default:
break;
}

return super.onTouchEvent(ev);
}

@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
}
}

就向使用一般的Scrollview 使用此View即可。