android Spinner OnItemSelectedListener监听无效,该怎么处理

android Spinner OnItemSelectedListener监听无效

@Override
	protected void onCreate(Bundle savedInstanceState) {
		
		super.onCreate(savedInstanceState);
		setContentView(R.layout.register);
                 info.WebGet();
		nations=info.initData(); //这个有数据，这里没有问题
		NationSpinner=(Spinner) findViewById(R.id.NationText);
	     MyAdapter myAdapter=new MyAdapter(this,loadRes,nations);
		NationSpinner.setAdapter(myAdapter);
		NationSpinner.setOnItemSelectedListener(myAdapter);
	}

上面是Activity的代码，
下面是 适配器的类；

public class MyAdapter extends BaseAdapter implements OnItemSelectedListener {

	Context context;
    ArrayList<Nation> list=new ArrayList<Nation>();
    private Handler handler;
    public MyAdapter(Context con,Handler handler,ArrayList<Nation> list){
    	this.list=list;
    	context=con;
    	this.handler=handler;
    }
	@Override
	public int getCount() {
		android.util.Log.i("t460470591", "getCount");
		return list.size();
	}
    
	@Override
	public Nation getItem(int position) {
		android.util.Log.i("t460470591", "getItem");
		return list.get(position);
	}

	@Override
	public long getItemId(int position) {
		android.util.Log.i("t460470591", "getItemId");
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		android.util.Log.i("t460470591", "getView "+position);
		Nation o=list.get(position);
		View view=View.inflate(context, R.layout.item_listview,null);
		TextView tView=(TextView) view.findViewById(R.id.nation_id);
		TextView tViewD=(TextView) view.findViewById(R.id.nation_text);
		tView.setText(o.getNationid()+"");
		tViewD.setText(o.getNationtext()+"");
		return view;
	}

	@Override   //执行不了这个方法
	public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
			long arg3) {
		android.util.Log.i("t460470591", "onItemSelected");
		TextView iDTextView=(TextView) arg1.findViewById(R.id.nation_id);
		TextView TextView=(TextView) arg1.findViewById(R.id.nation_text);
		Bundle bundle=new Bundle();
		bundle.putString(WebSerState.Operate, WebSerState.GetNation);
		bundle.putString(WebSerState.NationID, iDTextView.getText().toString().trim());
		bundle.putString(WebSerState.NationText,TextView.getText().toString().trim());
		Message msgMessage=new Message();
		msgMessage.what=WebSerState.Other;
		msgMessage.setData(bundle);
        handler.sendMessage(msgMessage);		
	}

	@Override
	public void onNothingSelected(AdapterView<?> arg0) {
		android.util.Log.i("t460470591", "onNothingSelected");
	}
	 
	
}

------解决方案--------------------
在R.layout.item_listview 这个布局文件里面 加入下面的标签试试，可能是没有焦点。

    android:descendantFocusability="blocksDescendants"
    android:focusable="false"