import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.animation.ValueAnimator.AnimatorUpdateListener;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.Interpolator;
import android.widget.ScrollView;
import android.widget.Scroller;
public class OverScrollView extends ScrollView{
private Context context;
public OverScrollView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.context=context;
// TODO Auto-generated constructor stub
}
public OverScrollView(Context context, AttributeSet attrs ) {
super(context, attrs );
this.context=context;
// TODO Auto-generated constructor stub
}
public OverScrollView(Context context ) {
super(context );
this.context=context;
// TODO Auto-generated constructor stub
}
private OnOverScrollListener listener;
public void setOnOverScrollListener(OnOverScrollListener listener) {
this.listener=listener;
}
public interface OnOverScrollListener {
void overScrollDown(float dis);
void overScrollUp(float dis);
void onScrollResumeFromBottomToTop(float maxDis,float dis);
void onScrollResumeFromTopToBottom(float maxDis,float dis);
void onScrollResumeFinished( );
}
private float pressY;
private float downDis;
private float upDis;
private float pressX;
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
// TODO Auto-generated method stub
if (ev.getAction()==MotionEvent.ACTION_DOWN) {
pressY=ev.getRawY();
pressX=ev.getRawX();
// System.out.println("onInterceptTouchEvent down "+pressY);
}
if (ev.getAction()==MotionEvent.ACTION_MOVE) {
float nowX=ev.getRawX();
float nowY=ev.getRawY();
float disX=Math.abs(nowX-pressX);
float disY=Math.abs(nowY-pressY);
if (disY>=ViewConfiguration.get(context).getScaledTouchSlop()&&disY>disX) {
return true;
}
}
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(final MotionEvent ev) {
// TODO Auto-generated method stub
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
pressY=ev.getRawY();
// System.out.println("down "+pressY);
break;
case MotionEvent.ACTION_MOVE:
int sy=getScrollY();
// System.out.println("move getRawY： " +ev.getRawY()+ " getScrollY: "+sy +" getChildAt(0).getHeight()："+getChildAt(0).getHeight()+" getHigh():"+getHeight());
if (sy==0&&ev.getRawY()>pressY) {
// isDown=true;
downDis=(float) ((ev.getRawY()-pressY)/3);
getChildAt(0).setTranslationY(downDis);
if (listener!=null) {
listener.overScrollDown(downDis);
}
return true;
}
// if (isDown) {
//
// setTranslationY(ev.getRawY()-pressY);
//
// return true;
// }
if (sy+getHeight()==getChildAt(0).getHeight()&&ev.getRawY()<pressY) {
// isUp=true;
upDis=(float) ((ev.getRawY()-pressY)/3);
getChildAt(0).setTranslationY(upDis);
if (listener!=null) {
listener.overScrollUp(upDis);
}
return true;
}
if (getHeight()>=getChildAt(0).getHeight()&&ev.getRawY()<pressY) {
upDis=(float) ((ev.getRawY()-pressY)/3);
getChildAt(0).setTranslationY(upDis);
if (listener!=null) {
listener.overScrollUp(upDis);
}
return true;
}
// if (isUp) {
// setTranslationY(ev.getRawY()-pressY);
// return true;
//
// }
pressY=ev.getRawY();
try {
return super.onTouchEvent(ev);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return false;
}
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
final float start=getChildAt(0).getTranslationY();
ObjectAnimator animator=ObjectAnimator.ofFloat(getChildAt(0), "translationY", start,0);
animator.setDuration(500);
animator.setInterpolator(new AccelerateDecelerateInterpolator());
animator.addUpdateListener(new AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
// TODO Auto-generated method stub
if (listener!=null) {
if (ev.getRawY()>pressY) {
listener.onScrollResumeFromBottomToTop(start,(Float)animation.getAnimatedValue());
}else
listener.onScrollResumeFromTopToBottom(start,(Float)animation.getAnimatedValue());
}
}
});
animator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
// TODO Auto-generated method stub
super.onAnimationEnd(animation);
if (listener!=null) {
listener.onScrollResumeFinished();
}
}
});
animator.start();
break;
}
return true;
}
}
原文地址：http://blog.csdn.net/qingchunweiliang/article/details/45973221
