ListView with multiple choice

package com.AndroidListView;



import android.app.Activity;

import android.os.Bundle;

import android.util.SparseBooleanArray;

import android.view.View;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.ListView;

import android.widget.Toast;



public class AndroidListViewActivity extends Activity {

	

	ListView myList;

	Button getChoice;

	

	String[] listContent = {

            "January",

            "February",

            "March",

            "April",

            "May",

            "June",

            "July",

            "August",

            "September",

            "October",

            "November",

            "December"

    };

	

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        myList = (ListView)findViewById(R.id.list);

        getChoice = (Button)findViewById(R.id.getchoice);

        

        ArrayAdapter<String> adapter

        = new ArrayAdapter<String>(this,

        		android.R.layout.simple_list_item_multiple_choice,

             listContent);

        

        myList.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

        myList.setAdapter(adapter);

        

        getChoice.setOnClickListener(new Button.OnClickListener(){



			@Override

			public void onClick(View v) {

				// TODO Auto-generated method stub

				

				String selected = "";

				

				int cntChoice = myList.getCount();

				SparseBooleanArray sparseBooleanArray = myList.getCheckedItemPositions();

				for(int i = 0; i < cntChoice; i++){

					if(sparseBooleanArray.get(i)) {

						selected += myList.getItemAtPosition(i).toString() + "\n";

						

					}

				}

				

				Toast.makeText(AndroidListViewActivity.this, 

						selected, 

						Toast.LENGTH_LONG).show();

			}});

        

    }

}

<?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"

    />

<Button

    android:id="@+id/getchoice"

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

    android:text="Get Choice"

    />

<ListView  

    android:id="@+id/list"

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

    />

</LinearLayout>