textChangedListener 未执行异步任务

Question

我正在编写这个从 rottentomatoes API 获取电影信息的应用程序。我正在使用客户端进行解析和 httprequests。

首先我尝试设置一个搜索视图，但由于我使用的是 framents (FragmentNavigationDrawer) 这不是一个选项。

下一个最好的事情。带有 ListPopupWindow 的 EditText。

我设置了 textchangelistener，这样当我开始在给定的 edittext(search) 中输入内容时，它应该执行 asynctask（使用 edittext 输入作为 api 请求的搜索词）。然而，什么也没有发生。不是一回事。 logcat中没有一行红色文字，app不会崩溃，什么都没有。所以我在 stackoverflow 求助于你的神级编码员。

片段：

public class SecondFragment extends Fragment{
ListPopupWindow listPopupWindow;
EditText search;
List<Movie> result = new ArrayList<Movie>();
private MovieAdapter adpt;
MovieSearch searchTask = new MovieSearch();


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.secondfragment, container, false);
    search = (EditText) view.findViewById(R.id.searchBox2);
    listPopupWindow = new ListPopupWindow(getActivity());
    adpt = new MovieAdapter(new ArrayList<Movie>(), getActivity());
    searchTask = new MovieSearch();

    listPopupWindow.setAdapter(adpt);
    listPopupWindow.setAnchorView(search);
    listPopupWindow.setWidth(300);
    listPopupWindow.setHeight(400);

    listPopupWindow.setModal(true);
    search.addTextChangedListener(new TextWatcher(){
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3){

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i2, int i3){

        }

        @Override
        public void afterTextChanged(Editable editable){
            searchTask.cancel(true);


            String input = search.getText().toString();
            searchTask.execute(input);

        }
    });

            // Inflate the layout for this fragment

   return inflater.inflate(R.layout.secondfragment, container, false);

}

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public void onClick(View view) {
        // detect the view that was "clicked"
        switch (view.getId()) {
            case R.id.addToCollection: //just a placeholder
            break;
        }
    }

    private class MovieSearch extends AsyncTask<String, Void, List<Movie>> {

        @Override
        protected void onPostExecute(List<Movie> result) {
        super.onPostExecute(result);
        adpt.setMovieList(result);
        adpt.notifyDataSetChanged();
        }
        @Override
        protected List<Movie> doInBackground(String... params){
            Log.e("Status", "Entered thread");
            String input = (params[0]);
            JTomato jtomato = new JTomato("jf6cykts4sybqrex3dkjd7uq");
            jtomato.setPage_limit(1);
            jtomato.searchMovie(input, result, 0);
            if (isCancelled())
            {
                 //Notify your activity that you had canceled the task
                return (null);
            }



            return result;
        }




    }



}

Answer 1

您永远不会创建 AsyncTask MovieSearch searchTask 的实例，它始终为空。

添加此代码 searchTask = new MovieSearch();

打电话之前

searchTask.execute();