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MainActivity如下:

package cc.testviewstudy4;import java.util.ArrayList;import java.util.HashMap;import cc.testviewstudy4.ListViewSubClass.OnDeleteListener;import android.os.Bundle;import android.widget.SimpleAdapter;import android.app.Activity;/** * Demo描述: * 关于自定义View的学习(四) *  * 自定义View的实现方式大概可以分为三种: * 自绘控件、组合控件、以及继承控件 * 在此Demo中实现继承控件: * 自定义ListView.在ListView的Item上滑动时可出现一个 * 删除View.点击它,可删除ListView中的该条数据 *  * 学习资料: * http://blog.csdn.net/guolin_blog/article/details/17357967 * Thank you very much *  */public class MainActivity extends Activity {    private ListViewSubClass mListView;    private SimpleAdapter mSimpleAdapter;    private ArrayList
   
    
     > mArrayList;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		init();	}		private void init(){		mListView=(ListViewSubClass) findViewById(R.id.listView);		mArrayList=new ArrayList
     
      
       >();      	HashMap
       
         hashMap=null;      	for (int i = 0; i <12; i++) {      		hashMap=new HashMap
        
         (); hashMap.put("name", "小明"+i); mArrayList.add(hashMap); } mSimpleAdapter=new SimpleAdapter(this, mArrayList, R.layout.listviewitem, new String []{"name"}, new int[]{R.id.name}); mListView.setAdapter(mSimpleAdapter); mListView.setOnDeleteListener(new OnDeleteListener() { @Override public void onDelete(int index) { mArrayList.remove(index); mSimpleAdapter.notifyDataSetChanged(); } }); }}
        
       
      
     
    
   

ListViewSubClass如下:

package cc.testviewstudy4;import android.content.Context;import android.util.AttributeSet;import android.view.GestureDetector;import android.view.GestureDetector.OnGestureListener;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.view.ViewGroup;import android.widget.ListView;import android.widget.RelativeLayout;public class ListViewSubClass extends ListView implements OnGestureListener,OnTouchListener {	private GestureDetector mGestureDetector;	private OnDeleteListener mDeleteListener;	private View mDeleteView;	private ViewGroup mListViewItemViewGroup;	private int selectedItem;	private boolean isDeleteShowing;		public ListViewSubClass(Context context) {		super(context);	}		public ListViewSubClass(Context context, AttributeSet attrs) {		super(context, attrs);		// 监听Touch		this.setOnTouchListener(this);		// 手势		mGestureDetector = new GestureDetector(context, this);	}		public ListViewSubClass(Context context, AttributeSet attrs, int defStyle) {		super(context, attrs, defStyle);	}		public void setOnDeleteListener(OnDeleteListener onDeleteListener){		mDeleteListener=onDeleteListener;	}	//定义一个接口	public interface OnDeleteListener {		void onDelete(int index);	}		//------>以下方法为OnTouchListener接口的实现	@Override	public boolean onTouch(View v, MotionEvent event) {		//if-->当有删除View的时候.我们触摸该ListView时将其消失		if (isDeleteShowing) {			mListViewItemViewGroup.removeView(mDeleteView);			mDeleteView = null;			isDeleteShowing = false;			return false;	    //else-->其余时候交给GestureDetector处理		} else {			return mGestureDetector.onTouchEvent(event);		}	}	//------>以下方法为OnTouchListener接口的实现				//------>以下方法为OnGestureListener接口的实现	@Override	public boolean onDown(MotionEvent e) {		if (!isDeleteShowing) {			selectedItem = pointToPosition((int) e.getX(), (int) e.getY());		}		return false;	}	@Override	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {		//当删除View没有显示并且是水平滑动时我们显示删除View		if (!isDeleteShowing && Math.abs(velocityX) > Math.abs(velocityY)) {			mDeleteView = LayoutInflater.from(getContext()).inflate(R.layout.delete, null);			mDeleteView.setOnClickListener(new OnClickListener() {				@Override				public void onClick(View v) {					mListViewItemViewGroup.removeView(mDeleteView);					mDeleteView = null;					isDeleteShowing = false;					mDeleteListener.onDelete(selectedItem);				}			});			//找到当前的Item			mListViewItemViewGroup = (ViewGroup) getChildAt(selectedItem-getFirstVisiblePosition());			RelativeLayout.LayoutParams params = new 			RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);			params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);			params.addRule(RelativeLayout.CENTER_VERTICAL);			mListViewItemViewGroup.addView(mDeleteView, params);			isDeleteShowing = true;		}				return false;	}	@Override	public void onLongPress(MotionEvent e) {	}	@Override	public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,float distanceY) {		return false;	}	@Override	public void onShowPress(MotionEvent e) {	}	@Override	public boolean onSingleTapUp(MotionEvent e) {		return false;	}	//------>以上方法为OnGestureListener接口的实现}

main.xml如下:

delete.xml如下:

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