android AdapterView.OnItemSelectedListener

参考android SDK http://developer.android.com/reference/android/widget/AdapterView.OnItemSelectedListener.html

OnItemSelectedListener接口可用于获取有焦点的AdapterView的item

OnItemSelectedListener接口的两个主要函数

1.public abstract void onItemSelected (AdapterView<?> parent, View view, int position, long id){

//...position即有焦点的索引值

}

@param

parent:装载数据的视图列表

view:列表中当前选中的item视图

position:选中的item在AdapterView中的索引

id:选中的item视图控件的id值

       在应用中经常用到ListView而不是AdapterView，ListView继承自AdapterView

//伪代码

ListView = (ListView)findViewById(R.id.ListViewId);

        ListView.setAdapter(BaseAdapter | ArrayAdapter | SimpleAdapter | 自定义Adapter);

ListView.setOnItemClickListener(OnItemClickListener listener);

ListView.setOnItemSelectedListener(OnItemSelectedListener listener);

  2.AdapterView失去焦点时调用此回调函数 public abstract void onNothingSelected (AdapterView<?> parent);