PopupWindow+ListView+OnItemClick无效解决思路

PopupWindow+ListView+OnItemClick无效
代码如下:

@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		final Button button1 = (Button) findViewById(R.id.button1);

		button1.setOnClickListener(new OnClickListener() {

			public void onClick(View v) {
				// TODO Auto-generated method stub
				// 生成ListView
				ListView listview = new ListView(MainActivity.this);
				String strs = new String;
				strs = "asfsafdasdf";
				strs = "桂　地要仍地沃尔夫仍";
				strs = "asfsafdasdf";
				 ArrayAdapter<String> adapter=new
				 ArrayAdapter<String>(MainActivity.this,R.layout.common_poplist_item_single_textview,R.id.content,strs);
//				ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, R.layout.common_poplist_item_single_textview, strs);
				listview.setAdapter(adapter);
				listview.setOnItemClickListener(new OnItemClickListener() {

					public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
						// TODO Auto-generated method stub
						System.out.println(position);
					}
				});

				PopupWindow window = new PopupWindow(MainActivity.this);
				// 设置宽高
				window.setWidth(200);
				window.setHeight(120);
				// 填充
				window.setContentView(listview);
				// 外部可部
				window.setOutsideTouchable(true);
				// 加了下面这行，onItemClick才好用
				window.setFocusable(true);
				window.showAsDropDown(button1);

			}
		});
	}

经测试,发现2.3的真机上OnItemClick能触发..但是在4.1,4.2的真机上测试无均反应..麻烦各位帮我验证一下是否如此,该如何解决.
------解决方案--------------------
点下按钮直接显示popwindow就好了
------解决方案--------------------
你把它写到外面试试呀
------解决方案--------------------