OnItemSelectedListener 监听器下调用函数 怎么输出结果为空

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.test_layout, container, false);
spinner=(Spinner)view.findViewById(R.id.spinner);
ss=(TextView)view.findViewById(R.id.ss);
String[]arr={"2014-2015学年冬季学期" , "2014-2015学年秋季学期","2014-2015学年夏季学期"};
ArrayAdapteradapter = new ArrayAdapter(getActivity(),android.R.layout.simple_spinner_item,arr);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(listener);
return view;
}
AdapterView.OnItemSelectedListener listener= new AdapterView.OnItemSelectedListener() {

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

        if(position==0){
            result= PostUtil.sendPost("20142");
            ss.setText(result.toString());

        }

为什么result的输出结果是空的,跪求大神解答

你这个PostUtil.sendPost("20142")是什么？position=0，是下拉项的第一项。

int型比较是 = 两个等于号是 赋值好不