AsyncTask点击ListView到下一个页面中异步任务中显示UI这的方法，不会显示数据

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view=inflater.inflate(R.layout.fragment_daxia, container, false);
    back=view.findViewById(R.id.back);
    backevent();
    daxia=view.findViewById(R.id.daxia);
    old_price=view.findViewById(R.id.old_price);
    tprice=view.findViewById(R.id.tprice);
    take_price=view.findViewById(R.id.take_price);
    xia_content=view.findViewById(R.id.xia_content);

    new XiaAsynckTask().execute(xiaurl);

    return view;
}

//返回按键，返回到主页面的
private void backevent() {
    back.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        getActivity().getSupportFragmentManager()
                .beginTransaction()
                .replace(R.id.container,new IndexkFragment(),null)
                .addToBackStack(null)
                .commit();

    }
});
}

class XiaAsynckTask extends AsyncTask<String,Void,List<Xiabean>>{


    @Override
    protected List<Xiabean> doInBackground(String... params) {

        return getJSONbject(params[0]);
    }

    @Override
    protected void onPostExecute(List<Xiabean> result) {
        super.onPostExecute( result);
        
        daxia.setText(result.get()); //?????????????????????????????就是这里






    }
}