安卓acttivity里面添加listview，然后监听里面的view，为什么点击没反应呢

Question

部分代码在这里
ListView lv = (ListView) findViewById(R.id.mylv);
lv.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
SimpleAdapter adapter = new SimpleAdapter(this,getData(),R.layout.vlist,
new String[]{"title","info","img"},
new int[]{R.id.title,R.id.info,R.id.img});
lv.setAdapter(adapter);

     Log.i(ACTIVITY_TAG, "在这里啊=============================");
        lv.setOnItemClickListener
        (new AdapterView.OnItemClickListener()
        {         public void onItemClick
          (AdapterView<?> arg0, View arg1, int arg2, long arg3)
          {
         edit.setText("我被点过");
          }         });