android---在ScrollView中嵌套ViewPager

在ScrollView 中如果有嵌套了ViewPager 那么 ViewPager的横向滑动将被ScrollView拦截掉，所以我们需要重写ScrollView来判断用户的手势，当用户手势在X方向上的距离大于在Y方向上的距离的时候判断是向左滑动，此时屏蔽ScrollView的滑动操作。反过来，就Y》X，就判定是ScrollView的滑动：重写的ScrollView代码如下：

package cn.leature.istarbaby.view;

/**

 * xu

 */

import android.content.Context;

import android.renderscript.Sampler;

import android.util.AttributeSet;

import android.view.GestureDetector;

import android.view.GestureDetector.SimpleOnGestureListener;

import android.view.MotionEvent;

import android.widget.ScrollView;

public class ScrollViewHasViewPager extends ScrollView {

//决定scrollview是否可以滑动

private boolean canScroll;

//手势

private GestureDetector gestureDetector;

public ScrollViewHasViewPager(Context context) {

super(context);

// TODO Auto-generated constructor stub

}

public ScrollViewHasViewPager(Context context, AttributeSet attrs) {

super(context, attrs);

// TODO Auto-generated constructor stub

gestureDetector = new GestureDetector(new YScrollView());

canScroll = true;

}

public ScrollViewHasViewPager(Context context, AttributeSet attrs,

int defStyle) {

super(context, attrs, defStyle);

// TODO Auto-generated constructor stub

}

@Override

public boolean onInterceptTouchEvent(MotionEvent ev) {

// TODO Auto-generated method stub

if(ev.getAction() == MotionEvent.ACTION_UP)

{

canScroll = true;

}

return super.onInterceptTouchEvent(ev)&&gestureDetector.onTouchEvent(ev);

}

class YScrollView extends SimpleOnGestureListener{

@Override

public boolean onScroll(MotionEvent e1, MotionEvent e2,

float distanceX, float distanceY) {

// TODO Auto-generated method stub

if(canScroll)

{

if(Math.abs(distanceY)>= Math.abs(distanceX))

{

canScroll = true;

}

else

{

canScroll = false;

}

}

return canScroll;

}

}

}