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   源码介绍

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package com.ghl.slidingdelete;

import com.nineoldandroids.view.ViewHelper;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.HorizontalScrollView;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class SlidingDelete extends HorizontalScrollView {
	private LinearLayout mWapper;
	private ViewGroup mContent;
	private ViewGroup mDelete;
	private int mScreenWidth;
	
	private int mDeleteWidth=50;
	
	private boolean once;//只计算一次
	private boolean isopen;//删除按钮是否显示

	public SlidingDelete(Context context) {
		this(context,null);
		// TODO Auto-generated constructor stub
	}

	public SlidingDelete(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		//获取屏幕宽度
	    WindowManager wm=(WindowManager)context.getSystemService(context.WINDOW_SERVICE);
	    DisplayMetrics outMetrics=new DisplayMetrics();
	    wm.getDefaultDisplay().getMetrics(outMetrics);
	    mScreenWidth=outMetrics.widthPixels;
	    //获取滑动删除按钮宽度,自定义属性
	    TypedArray array=context.getTheme().obtainStyledAttributes(attrs, R.styleable.SlidingDelete, defStyle,0);
	    int n=array.getIndexCount();
	    for (int i = 0; i <n; i  ) {
			int attr=array.getIndex(i);
			switch (attr) {
			case R.styleable.SlidingDelete_deletewidth:
			    mDeleteWidth=array.getDimensionPixelSize(attr, (int)TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, context.getResources().getDisplayMetrics()));
				break;

			}
		}
		array.recycle();
	}

	public SlidingDelete(Context context, AttributeSet attrs) {
		this(context, attrs,0);
		// TODO Auto-generated constructor stub
	}
	
	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
		// 布局视图
		int mTotalWidth=0;
		int childcount=mWapper.getChildCount();
		//Log.v("Childcount", childcount "");
		for (int i = 0; i <childcount; i  ) {
			View childView=mWapper.getChildAt(i);
			int measureWidth=childView.getMeasuredWidth();
			int measureHeight=childView.getMeasuredHeight();
			childView.layout(mTotalWidth,t, measureWidth mTotalWidth, measureHeight);
			mTotalWidth =measureWidth;
		}
		super.onLayout(changed, l, t, r, b);	
	}
	
	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		// 计算宽高
		if(!once){
		mWapper=(LinearLayout)getChildAt(0);
		mContent=(ViewGroup)mWapper.getChildAt(0);
		mDelete=(ViewGroup)mWapper.getChildAt(1);
		
		mContent.getLayoutParams().width=mScreenWidth;
		mDelete.getLayoutParams().width=mDeleteWidth;
		once=true;
		}
		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
		
	}
	/*
	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		// 滑动触摸事件
		Log.v("TouchEvent", "触摸事件");
		int action=ev.getAction();
		switch (action) {
		case MotionEvent.ACTION_UP:
			//得到隐藏宽度，左边为正，右边为负
			int scrollx=getScrollX();
			if(scrollx>=mDeleteWidth/2){
				this.smoothScrollTo(0, 0);
				isopen=false;
			}else{
			    this.smoothScrollTo(mDeleteWidth, 0);
			    isopen=true;
			}
			break;
		}
		return super.onTouchEvent(ev);
	}*/
	
	@Override
	protected void onScrollChanged(int l, int t, int oldl, int oldt) {
		// 对滑动监听,l的值就是srcollX的值
		//抽屜式效果，3.0以下要引入nineoldandroid包
		ViewHelper.setTranslationX(mDelete, l);
		super.onScrollChanged(l, t, oldl, oldt);
	}

}