public interface OnScrollEndListener {
 void scrollToBottom(View view);
 void scrollToTop(View view);
 void scrollToMiddle(View view);
 }

 @Override
 protected void onScrollChanged(int l, int t, int oldl, int oldt) {
 super.onScrollChanged(l, t, oldl, oldt);
 if(t == 0){
  if (mOnScrollBottomListener != null) {
  mOnScrollBottomListener.scrollToTop(this);
  }
 } else if(t + getMeasuredHeight() >= getChildAt(0).getMeasuredHeight()){
  if (mOnScrollBottomListener != null) {
  mOnScrollBottomListener.scrollToBottom(this);
  }
 } else {
  if (mOnScrollBottomListener != null) {
  mOnScrollBottomListener.scrollToMiddle(this);
  }
 }
 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 super.onMeasure(widthMeasureSpec, heightMeasureSpec);
 /**
  * 显示调用第二个自孩子的测量方法，不然尺寸有可能为0
  */
 View child2 = getChildAt(1);
 if (child2 != null) {
  child2.measure(widthMeasureSpec, heightMeasureSpec);
 }
 }

@Override
 protected void onFinishInflate() {
 super.onFinishInflate();
 if(getChildCount() == 2){
  View child1 = getChildAt(0);
  if (child1 instanceof ScrollEndScrollView){
  scrollView1 = (ScrollEndScrollView) child1;
  }
  View child2 = getChildAt(1);
  if(child2 instanceof ScrollEndScrollView){
  scrollView2 = (ScrollEndScrollView) child2;
  }
 }

 initEvent();
 }

private ScrollEndScrollView.OnScrollEndListener scrollEndListener = new ScrollEndScrollView.OnScrollEndListener() {
 @Override
 public void scrollToBottom(View view) {
  if(view == scrollView1){
  isToBotttom = true;
  }
 }

 @Override
 public void scrollToTop(View view) {
  if(view == scrollView2){
  isToTop = true;
  }
 }

 @Override
 public void scrollToMiddle(View view) {
  if(view == scrollView1){
  isToBotttom = false;
  }
  if(view == scrollView2){
  isToTop = false;
  }
 }
 };

@Override
 public void computeScroll() {
 super.computeScroll();
 //先判断mScroller滚动是否完成
 if (mScroller.computeScrollOffset()) {
  //这里调用View的scrollTo()完成实际的滚动
  scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
  //必须调用该方法，否则不一定能看到滚动效果
  postInvalidate();
 }
 }

 //调用此方法设置滚动的相对偏移
 public void smoothScrollBy(int dx, int dy) {
 //设置mScroller的滚动偏移量
 mScroller.startScroll(mScroller.getFinalX(), mScroller.getFinalY(), dx, dy, Math.max(300, Math.abs(dy)));
 invalidate();//这里必须调用invalidate()才能保证computeScroll()会被调用，否则不一定会刷新界面，看不到滚动效果
 }

//调用此方法滚动到目标位置
 public void smoothScrollTo(int fx, int fy) {
 int dx = fx - mScroller.getFinalX();
 int dy = fy - mScroller.getFinalY();
 smoothScrollBy(dx, dy);
 }

@Override
 public boolean dispatchTouchEvent(MotionEvent ev) {
 int action = ev.getAction();
 int yPosition = (int) ev.getY();
 switch (action) {
  case MotionEvent.ACTION_DOWN:
  mScroller.abortAnimation();
  mLastY = yPosition;
  mMoveY = 0;
  break;
  case MotionEvent.ACTION_MOVE:
  mMoveY = (mLastY - yPosition);
  mLastY = yPosition;
  if(isToBotttom){
   if(mMoveY > 0){
   //向上
   smoothScrollBy(0, mMoveY);
   return true;
   } else {
   //向下
   if(mScroller.getFinalY() != 0){
    //这是出于第一页和第二页显示连接处
    if(getScrollY() + mMoveY > 0){
    smoothScrollBy(0, mMoveY);
    return true;
    } else{
    smoothScrollTo(0, 0);
    return super.dispatchTouchEvent(ev);
    }
   }
   }
  }
  else if(isToTop){
   if(mMoveY < 0){
   //向下
   smoothScrollBy(0, mMoveY);
   return true;
   } else {
   //向上
   if(mScroller.getFinalY() < scrollView1.getHeight()){
    //这是出于第一页和第二页显示连接处
    smoothScrollBy(0, mMoveY);
    return true;
   } else {
    smoothScrollTo(0, scrollView1.getHeight());
    return super.dispatchTouchEvent(ev);
   }
   }
  }

  //处理快速滑动时两页覆盖问题
  if(pageIndex == 0){
   smoothScrollTo(0, 0);
  } else if(pageIndex == 1){
   smoothScrollTo(0, scrollView1.getHeight());
  }

  break;

  case MotionEvent.ACTION_UP:
  case MotionEvent.ACTION_CANCEL:
  if(isToBotttom){
   if(Math.abs(getScrollY()) > TO_NEXT_PAGE_HEIGHT){
   //移动到第二页
   pageIndex = 1;
   smoothScrollTo(0, scrollView1.getHeight());
   isToBotttom = false;
   isToTop = true;
   } else {
   //回弹
   smoothScrollBy(0, -mScroller.getFinalY());
   }
  } else if(isToTop){
   if(scrollView1.getHeight() - getScrollY() > TO_NEXT_PAGE_HEIGHT){
   //移动到第一页
   pageIndex = 0;
   smoothScrollTo(0, 0);
   isToBotttom = true;
   isToTop = false;
   } else {
   //回弹
   smoothScrollTo(0, scrollView1.getHeight());
   }
  }

  break;
  default:
  break;
 }

 return super.dispatchTouchEvent(ev);
 }