ListView中的每个条目怎么跳转到另外的Activity

ListView中的每个条目如何跳转到另外的Activity?
listview布局中有16个条目(Item)，如何实现每一个item都能跳转到另外的一个Activity，我是这么做的，但是没有反应，还请大家指点一下:代码是这些    GroupActivity.java

package com.test.listview;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
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 GroupActivity extends Activity{
	private ListView listView;
    private ListViewAdapter listViewAdapter;
    private List<Map<String, Object>> listItems;  
	protected SharedPreferences group_sp;
    
	@Override
	public void onCreate(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);
		setContentView(R.layout.group);
		
		listView=(ListView)findViewById(R.id.group1_list);
		listItems=getlistItems();
		listViewAdapter=new ListViewAdapter(this, listItems);
		listView.setAdapter(listViewAdapter);
		listView.setTextFilterEnabled(true);
		
		listView.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view, int position,long id) {
				Log.i("mm", " onItemClick ");
				Intent intent=new Intent();
				switch(position){
				case 0:
					intent.setClass(getApplicationContext(), ListViewGroup.class);
					GroupActivity.this.startActivity(intent);
					break;
				case 1:
					intent.setClass(getApplicationContext(), ListViewGroup.class);
					GroupActivity.this.startActivity(intent);
					break;
				case 2:
					intent.setClass(getApplicationContext(), ListViewGroup.class);
					GroupActivity.this.startActivity(intent);
					break;
				case 3:
					intent.setClass(getApplicationContext(), ListViewGroup.class);
					GroupActivity.this.startActivity(intent);
					break;
				case 4:
					intent.setClass(getApplicationContext(), ListViewGroup.class);
					GroupActivity.this.startActivity(intent);
					break;
				case 5:
					intent.setClass(getApplicationContext(), ListViewGroup.class);
					GroupActivity.this.startActivity(intent);
					break;
				case 6:
					intent.setClass(getApplicationContext(), ListViewGroup.class);
					GroupActivity.this.startActivity(intent);
					break;
				case 7:
					intent.setClass(getApplicationContext(), ListViewGroup.class);
					GroupActivity.this.startActivity(intent);
					break;
				case 8:
					intent.setClass(getApplicationContext(), ListViewGroup.class);
					GroupActivity.this.startActivity(intent);
					break;
				case 9:
					intent.setClass(getApplicationContext(), ListViewGroup.class);
					GroupActivity.this.startActivity(intent);
					break;
				case 10:
					intent.setClass(getApplicationContext(), ListViewGroup.class);
					GroupActivity.this.startActivity(intent);
					break;
				case 11:
					intent.setClass(getApplicationContext(), ListViewGroup.class);
					GroupActivity.this.startActivity(intent);
					break;
				case 12: