当listview的item多于一个屏幕的时候，出现重复选择问题

在Android应用开发中，很多时候都会遇到这样的需求，一个listView，含有N项，当点击某项时，该项展开，显示该项中隐藏的某些控件，再点击，该项收回，重新隐藏部分控件，当一项打开状态，点击另一项，另一项展开，该项关闭。


当listview的item多于一个屏幕的时候，会出现重复选择问题，就是当你选中一项滑动的时候，可能会发现滑动后出现的某项也是在选中状态，这个问题令人十分抓狂。见网上有个方法是：在adapter的getView里面不使用convertview。每一个view都是重新创建一个。能够解决问题，但是还是有点浪费资源。

main.xml：

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    android:orientation="vertical" >  
  
    <TextView  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:text="ListView Test" />  
    <ListView   
        android:id="@+id/list"  
        android:layout_width="wrap_content"  
        android:layout_height="fill_parent"  
        ></ListView>  
  
</LinearLayout>  

list_item.xml：

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout  
    xmlns:android="http://schemas.android.com/apk/res/android"  
    android:layout_width="match_parent"  
    android:layout_height="wrap_content"  
    android:orientation="vertical"  
    >  
    <TextView   
        android:id="@+id/textView"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:text="Test"  
        android:textSize="20sp"  
        />  
    <LinearLayout  
        android:id="@+id/hint_image"  
        android:layout_width="match_parent"  
        android:layout_height="wrap_content"  
        android:orientation="horizontal"  
        android:visibility="gone">  
        <ImageView   
            android:id="@+id/image_uefa"  
            android:layout_width="0dp"  
            android:layout_height="60dp"  
            android:layout_weight="1"  
            android:src="@drawable/uefa"  
            />  
        <ImageView   
            android:id="@+id/image_mascot"  
            android:layout_width="0dp"  
            android:layout_height="60dp"  
            android:layout_weight="1"  
            android:src="@drawable/mascot"  
            />  
          
    </LinearLayout>  
      
</LinearLayout>  

ListAdapter:

package cn.demo;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class ListAdapter extends BaseAdapter {
	private Context mContext;
	private int mLastPosition = -1;
	
	public ListAdapter(Context context) {
		this.mContext = context;
	}

	@Override
	public int getCount() {
		return 100;
	}

	@Override
	public Object getItem(int position) {
		return null;
	}

	@Override
	public long getItemId(int position) {
		return 0;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		Holder holder = new Holder();;
		if(convertView == null ) {
			LayoutInflater inflater = LayoutInflater.from(mContext);
			convertView = inflater.inflate(R.layout.list_item, null);
			
			holder.textView = (TextView)convertView.findViewById(R.id.textView);
			holder.UEFAView = (ImageView)convertView.findViewById(R.id.image_uefa);
			holder.mascotView = (ImageView)convertView.findViewById(R.id.image_mascot);
			holder.hint = convertView.findViewById(R.id.hint_image);
			convertView.setTag(holder);
		} else {
			holder = (Holder) convertView.getTag();
		}
		holder.textView.setText("Hello,It is " + position);
		if (position == mLastPosition) {
		    holder.hint.setVisibility(View.VISIBLE);
		} else {
		    holder.hint.setVisibility(View.GONE);
		}
		return convertView;
	}
	
	class Holder {
		TextView textView;
		ImageView UEFAView;
		ImageView mascotView;
		View hint;
	}
	
	public void changeImageVisable(int position) {
	    if(position != mLastPosition) {
	        mLastPosition = position;
	    } else {
	        mLastPosition = -1;
	    }
	    notifyDataSetChanged();
	}
}

ListViewTestActivity:

package cn.demo;


import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

public class ListViewTestActivity extends Activity implements OnItemClickListener{
	private ListView mListView;
	private ListAdapter mAdapter;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        mListView = (ListView)findViewById(R.id.list);
        mAdapter = new  ListAdapter(this);
        mListView.setAdapter(mAdapter);
        mListView.setOnItemClickListener(this);
    }
    
	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
		mAdapter.changeImageVisable(position);
	}
}