1、设计思路

在Scroller的应用--滑屏实现中使用Scroller实现滑屏效果，这里使用Scroller与ListView实现类似QQ滑动，然后点击删除功能，设计思路是Item使用Scroller实现滑动，ListView根据触摸判断是横向滑动还是竖直滑动，关于点击事件处理思路：对于View的onClick事件跟平常一样，里面针对OnItemClick做了处理，判断触摸距离来判断，如果小于5的话，在Item的onTouchEvent方法中的MotionEvent.ACTION_UP里面返回false，这样ListView里面的dispatchTouchEvent的super.dispatchTouchEvent(event)就会返回false,根据x,y获取当前position以及点击的view，调用super.performItemClick(view, position, view.getId());来告诉ListView出发onItemClick事件。

2、Item的代码

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package com.jwzhangjie.scrollview;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Scroller;

public class ListItemDelete extends LinearLayout {

	private Scroller mScroller;// 滑动控制
	private float mLastMotionX;// 记住上次触摸屏的位置
	private int deltaX;
	private int back_width;
	private float downX;

	public ListItemDelete(Context context) {
		this(context, null);
	}

	public ListItemDelete(Context context, AttributeSet attrs) {
		super(context, attrs);
		init(context);
	}

	private void init(Context context) {
		mScroller = new Scroller(context);
	}

	@Override
	public void computeScroll() {
		if (mScroller.computeScrollOffset()) {// 会更新Scroller中的当前x,y位置
			scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
			postInvalidate();
		}
	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
		int count = getChildCount();
		for (int i = 0; i < count; i++) {
			measureChild(getChildAt(i), widthMeasureSpec, heightMeasureSpec);
			if (i == 1) {
				back_width = getChildAt(i).getMeasuredWidth();
			}
		}

	}

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		int action = event.getAction();
		float x = event.getX();
		switch (action) {
		case MotionEvent.ACTION_DOWN:
			Log.e(test, item  ACTION_DOWN);
			mLastMotionX = x;
			downX = x;
			break;
		case MotionEvent.ACTION_MOVE:
			Log.e(test, back_width +   item  ACTION_MOVE   + getScrollX());
			deltaX = (int) (mLastMotionX - x);
			mLastMotionX = x;
			int scrollx = getScrollX() + deltaX;
			if (scrollx > 0 && scrollx < back_width) {
				scrollBy(deltaX, 0);
			} else if (scrollx > back_width) {
				scrollTo(back_width, 0);
			} else if (scrollx < 0) {
				scrollTo(0, 0);
			}
			break;
		case MotionEvent.ACTION_UP:
			Log.e(test, item  ACTION_UP);
			int scroll = getScrollX();
			if (scroll > back_width / 2) {
				scrollTo(back_width, 0);
			} else {
				scrollTo(0, 0);
			}
			if (Math.abs(x - downX) < 5) {// 这里根据点击距离来判断是否是itemClick
				return false;
			}
			break;
		case MotionEvent.ACTION_CANCEL:
			scrollTo(0, 0);
			break;
		}
		return true;
	}

	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
		int margeLeft = 0;
		int size = getChildCount();
		for (int i = 0; i < size; i++) {
			View view = getChildAt(i);
			if (view.getVisibility() != View.GONE) {
				int childWidth = view.getMeasuredWidth();
				// 将内部子孩子横排排列
				view.layout(margeLeft, 0, margeLeft + childWidth,
						view.getMeasuredHeight());
				margeLeft += childWidth;
			}
		}
	}
}

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3、ListView的代码

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