ScrollView重写实现监听

package com.ft.mysinaweibo;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.webkit.WebView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ScrollView;
import android.widget.Scroller;

/**
 * 自定义ScrollView，解决： 1. ScrollView嵌套ViewPager，导致ViewPager不能滑动的问题 2.
 * ScrollView源码并没有实现滚动监听，所以我们必须自行实现对ScrollView的监听，
 * 我们很自然的想到在onTouchEvent()方法中实现对滚动Y轴进行监听 ScrollView的滚动Y值进行监听
 * 
 */
public class CustomScrollView extends ScrollView {
    private GestureDetector mGestureDetector;
    private int Scroll_height = 0;
    private int view_height = 0;
    protected Field scrollView_mScroller;
    private static final String TAG = "CustomScrollView";

    private OnScrollListener onScrollListener;
    private int lastScrollY;// ScrollView在Y方向滑动的最后距离

    public CustomScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
        // mGestureDetector = new GestureDetector(context, new
        // YScrollDetector());
        setFadingEdgeLength(0);
    }

    // --------------------------------------------------------------------------//
    /**
     * 设置滚动接口
     * 
     * @param onScrollListener
     */
    public void setOnScrollListener(OnScrollListener onScrollListener) {
        this.onScrollListener = onScrollListener;
    }

    /**
     * 用于用户手指离开MyScrollView的时候获取MyScrollView滚动的Y距离，然后回调给onScroll方法中
     */
    private Handler handler = new Handler() {

        public void handleMessage(android.os.Message msg) {
            int scrollY = CustomScrollView.this.getScrollY();

            // 此时的距离和记录下的距离不相等，在隔5毫秒给handler发送消息
            if (lastScrollY != scrollY) {
                lastScrollY = scrollY;
                handler.sendMessageDelayed(handler.obtainMessage(), 5);
            }
            if (onScrollListener != null) {
                onScrollListener.onScroll(scrollY);
            }

        };

    };

    /**
     * 滚动的回调接口
     */
    public interface OnScrollListener {
        /**
         * 回调方法， 返回MyScrollView滑动的Y方向距离
         */
        public void onScroll(int scrollY);
    }

    
    
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        int scrollY = getScrollY();

        // 此时的距离和记录下的距离不相等，在隔5毫秒给handler发送消息
        if (lastScrollY != scrollY) {
            lastScrollY = scrollY;
            handler.sendMessageDelayed(handler.obtainMessage(), 5);
        }
        if (onScrollListener != null) {
            onScrollListener.onScroll(scrollY);
        }
        return super.onTouchEvent(ev);
    }

}