Question

listview和scrollview怎么实现惯性滑动

Answer 1

第一步实现了水平滑动，往往我们会把这个水平ListView放到ScrollView里面，而这两个控件恰好滑动会有冲突，滑动水平ListView时会有卡顿，因此重写ScrollView，以达到流畅滑动：
package com.liucanwen.horizontallistview.view;

import android.content.Context;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ScrollView;

/**
* 重写ScrollView,以解决ScrollView与水平listView滑动时冲突
*/
public class MyScrollView extends ScrollView
{
private GestureDetector mGestureDetector;
View.OnTouchListener mGestureListener;

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

@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)
{
if (Math.abs(distanceY) > Math.abs(distanceX))
{
return true;
}
return false;
}
}
}