讀取多選項列表視圖(Read multiple choice ListView)

package com.MultiChoiceList;

import android.app.Activity;
import android.os.Bundle;
import android.util.SparseBooleanArray;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MultiChoiceList extends Activity {
 
 ListView list;
 TextView selection;
 
 String[] options = {"Option 1", "Option 2", "Option 3",
   "Option 4", "Option 5", "Option 6"};
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        list = (ListView)findViewById(R.id.list);
        selection = (TextView)findViewById(R.id.selection);
        
        ArrayAdapter<String> adapter
        = new ArrayAdapter<String>(this,
          android.R.layout.simple_list_item_multiple_choice,
          options);
        list.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
 
        list.setAdapter(adapter);
        
        list.setOnItemClickListener(new OnItemClickListener(){

   @Override
   public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
     long arg3) {
    // TODO Auto-generated method stub
    selection.setText(ReadSelection());
   }});
    }
    
    String ReadSelection(){
     
     String selected = "";
     int cntChoice = list.getCount();
     SparseBooleanArray sparseBooleanArray = list.getCheckedItemPositions();
     
     for(int i = 0; i < cntChoice; i++){
      if(sparseBooleanArray.get(i)) {
       selected += list.getItemAtPosition(i).toString() + "\n"; 
      }
        }
     
     return selected;
    }
}

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