转载请表明出处：http://blog.csdn.net/lmj623565791/article/details/22961279

在CSDN上开了很多大神们的文章，感觉受益良多，也非常欣赏大家的分享态度，所以决定开始写微博，给大家分享自己的心得。

本来准备在ListView的每个Item的布局上设置一个隐藏的Button，当滑动的时候显示。但是因为每次只要存在一个Button，发现每个Item上的Button相互间不好控制。所以决定继承ListView然后结合PopupWindow。

首先是布局文件：

delete_btn.xml：这里只需要一个Button

主布局文件：activity_main.xml ，ListView的每个Item的样式直接使用了系统的android.R.layout.simple_list_item_1

接下来看看QQListView的实现：

package com.example.listviewitemslidedeletebtnshow;import android.content.Context;import android.util.AttributeSet;import android.view.Gravity;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.ViewConfiguration;import android.widget.Button;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.PopupWindow;public class QQListView extends ListView{	private static final String TAG = "QQlistView";	// private static final int VELOCITY_SANP = 200;	// private VelocityTracker mVelocityTracker;	/**	 * 用户滑动的最小距离	 */	private int touchSlop;	/**	 * 是否响应滑动	 */	private boolean isSliding;	/**	 * 手指按下时的x坐标	 */	private int xDown;	/**	 * 手指按下时的y坐标	 */	private int yDown;	/**	 * 手指移动时的x坐标	 */	private int xMove;	/**	 * 手指移动时的y坐标	 */	private int yMove;	private LayoutInflater mInflater;	private PopupWindow mPopupWindow;	private int mPopupWindowHeight;	private int mPopupWindowWidth;	private Button mDelBtn;	/**	 * 为删除按钮提供一个回调接口	 */	private DelButtonClickListener mListener;	/**	 * 当前手指触摸的View	 */	private View mCurrentView;	/**	 * 当前手指触摸的位置	 */	private int mCurrentViewPos;	/**	 * 必要的一些初始化	 * 	 * @param context	 * @param attrs	 */	public QQListView(Context context, AttributeSet attrs)	{		super(context, attrs);		mInflater = LayoutInflater.from(context);		touchSlop = ViewConfiguration.get(context).getScaledTouchSlop();		View view = mInflater.inflate(R.layout.delete_btn, null);		mDelBtn = (Button) view.findViewById(R.id.id_item_btn);		mPopupWindow = new PopupWindow(view, LinearLayout.LayoutParams.WRAP_CONTENT,				LinearLayout.LayoutParams.WRAP_CONTENT);		/**		 * 先调用下measure,否则拿不到宽和高		 */		mPopupWindow.getContentView().measure(0, 0);		mPopupWindowHeight = mPopupWindow.getContentView().getMeasuredHeight();		mPopupWindowWidth = mPopupWindow.getContentView().getMeasuredWidth();	}	@Override	public boolean dispatchTouchEvent(MotionEvent ev)	{		int action = ev.getAction();		int x = (int) ev.getX();		int y = (int) ev.getY();		switch (action)		{		case MotionEvent.ACTION_DOWN:			xDown = x;			yDown = y;			/**			 * 如果当前popupWindow显示，则直接隐藏，然后屏蔽ListView的touch事件的下传			 */			if (mPopupWindow.isShowing())			{				dismissPopWindow();				return false;			}			// 获得当前手指按下时的item的位置			mCurrentViewPos = pointToPosition(xDown, yDown);			// 获得当前手指按下时的item			View view = getChildAt(mCurrentViewPos - getFirstVisiblePosition());			mCurrentView = view;			break;		case MotionEvent.ACTION_MOVE:			xMove = x;			yMove = y;			int dx = xMove - xDown;			int dy = yMove - yDown;			/**			 * 判断是否是从右到左的滑动			 */			if (xMove < xDown && Math.abs(dx) > touchSlop && Math.abs(dy) < touchSlop)			{				// Log.e(TAG, "touchslop = " + touchSlop + " , dx = " + dx +				// " , dy = " + dy);				isSliding = true;			}			break;		}		return super.dispatchTouchEvent(ev);	}	@Override	public boolean onTouchEvent(MotionEvent ev)	{		int action = ev.getAction();		/**		 * 如果是从右到左的滑动才相应		 */		if (isSliding)		{			switch (action)			{			case MotionEvent.ACTION_MOVE:				int[] location = new int[2];				// 获得当前item的位置x与y				mCurrentView.getLocationOnScreen(location);				// 设置popupWindow的动画				mPopupWindow.setAnimationStyle(R.style.popwindow_delete_btn_anim_style);				mPopupWindow.update();				mPopupWindow.showAtLocation(mCurrentView, Gravity.LEFT | Gravity.TOP,						location[0] + mCurrentView.getWidth(), location[1] + mCurrentView.getHeight() / 2								- mPopupWindowHeight / 2);				// 设置删除按钮的回调				mDelBtn.setOnClickListener(new OnClickListener()				{					@Override					public void onClick(View v)					{						if (mListener != null)						{							mListener.clickHappend(mCurrentViewPos);							mPopupWindow.dismiss();						}					}				});				// Log.e(TAG, "mPopupWindow.getHeight()=" + mPopupWindowHeight);				break;			case MotionEvent.ACTION_UP:				isSliding = false;			}			// 相应滑动期间屏幕itemClick事件，避免发生冲突			return true;		}		return super.onTouchEvent(ev);	}	/**	 * 隐藏popupWindow	 */	private void dismissPopWindow()	{		if (mPopupWindow != null && mPopupWindow.isShowing())		{			mPopupWindow.dismiss();		}	}	public void setDelButtonClickListener(DelButtonClickListener listener)	{		mListener = listener;	}	interface DelButtonClickListener	{		public void clickHappend(int position);	}}

代码注释写得很详细，简单说一下，在dispatchTouchEvent中设置当前是否响应用户滑动，然后在onTouchEvent中判断是否响应，如果响应则popupWindow以动画的形式展示出来。当然屏幕上如果存在PopupWindow则屏幕ListView的滚动与Item的点击，以及从右到左滑动时屏幕Item的click事件。

接下来是MainActivity.java，这里代码很简单不做介绍了。

package com.example.listviewitemslidedeletebtnshow;import java.util.ArrayList;import java.util.Arrays;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ArrayAdapter;import android.widget.Toast;import com.example.listviewitemslidedeletebtnshow.QQListView.DelButtonClickListener;public class MainActivity extends Activity{	private QQListView mListView;	private ArrayAdapter
    
      mAdapter;	private List
     
       mDatas;	@Override	protected void onCreate(Bundle savedInstanceState)	{		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		mListView = (QQListView) findViewById(R.id.id_listview);		// 不要直接Arrays.asList		mDatas = new ArrayList
      
       (Arrays.asList("HelloWorld", "Welcome", "Java", "Android", "Servlet", "Struts",				"Hibernate", "Spring", "HTML5", "Javascript", "Lucene"));		mAdapter = new ArrayAdapter
       
        (this, android.R.layout.simple_list_item_1, mDatas);		mListView.setAdapter(mAdapter);		mListView.setDelButtonClickListener(new DelButtonClickListener()		{			@Override			public void clickHappend(final int position)			{				Toast.makeText(MainActivity.this, position + " : " + mAdapter.getItem(position), 1).show();				mAdapter.remove(mAdapter.getItem(position));			}		});		mListView.setOnItemClickListener(new OnItemClickListener()		{			@Override			public void onItemClick(AdapterView
         parent, View view, int position, long id)			{				Toast.makeText(MainActivity.this, position + " : " + mAdapter.getItem(position), 1).show();			}		});	}}
       
      
     
    

效果图如下：楼主使用asm.jar以及gifcamera截的gif，由于button的动画很短感觉截图效果很卡不流畅，大家有什么好的截图，还望推荐。有兴趣的还是下载源码看看效果i。