完美解决ScrollView嵌套ViewPager滑动失效和无法正常滑动冲突问题

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 * Copyright 2011, 2012 Chris Banes.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
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 *
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package com.baiyi.tuan.views.pulldownview;
 
import android.content.Context;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.widget.ScrollView;
 
/**
 * 完美解决ScrollView嵌套ViewPager滑动失效和无法正常滑动冲突问题
 * 
 * @author leict
 * 
 */
public class VerticalScrollView extends ScrollView {
 
    private GestureDetector mGestureDetector;
 
    public VerticalScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
        mGestureDetector = new GestureDetector(context, new YScrollDetector());
    }
 
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return super.onInterceptTouchEvent(ev)
                && mGestureDetector.onTouchEvent(ev);
    }
 
    class YScrollDetector extends SimpleOnGestureListener {
 
        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2,
                float distanceX, float distanceY) {
            // 如果我们滚动更接近水平方向,返回false,让子视图来处理它
            return (Math.abs(distanceY) > Math.abs(distanceX));
        }
    }
 
}