将AsyncTask与RecyclerView一起使用:没有结果，但asynctask似乎正在工作

Question

我目前正在开发一个天气应用程序。我想我已经使用 GSON 成功解析了结果，但现在我的回收器视图是空的。我有日志指出从服务器中提取了一些东西，但没有显示任何内容。看起来我的代码是正确的，但我知道我错过了一些东西。有人可以让我知道我错过了什么吗？

这是我的片段：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_weather_app, container, false);
mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
mRecyclerView.addItemDecoration(new DividerItemDecoration(mRecyclerView.getContext(), DividerItemDecoration.VERTICAL));
Log.d("debugMode", "The application stopped after this");
adapter = new RecyclerViewAdapter(items, mRecyclerView.getContext());
mRecyclerView.setAdapter(adapter);

new GetWeatherAync(this, mStatusView, api_key).execute();
return view;
}

这是我的异步任务：

@Override
protected List<ForecastWeatherList> doInBackground(Context...params) {
try {
Log.d("debugMode", "The application is in doInBackground");
URL url = new URL(serviceUrl);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setReadTimeout(10000 /* milliseconds */);
urlConnection.setConnectTimeout(15000 /* milliseconds */);
urlConnection.setRequestMethod("GET");
urlConnection.connect();
// If the request was successful (response code 200),
// then read the input stream and parse the response.
if (urlConnection.getResponseCode() == 200) {
Log.e(TAG, "Response code:" + urlConnection.getResponseCode());
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
Log.e("response",bufferedReader.toString());
Gson gson = new Gson();
if (!bufferedReader.equals("")) {
ForecastWeatherListWrapper weatherWrapper = gson.fromJson(bufferedReader, ForecastWeatherListWrapper.class);
Log.e("something", weatherWrapper.getforecastWeatherLists().size() + "");
List<ForecastWeatherList> forecastWeatherLists = weatherWrapper.getforecastWeatherLists();
return forecastWeatherLists;
} else {
Log.e(TAG, "Error response code: " + urlConnection.getResponseCode());
}
}
} catch (Exception e) {
Log.e("catch","error");
System.out.println(e.getMessage());
}

return null;

}

@Override
protected void onPostExecute(List<ForecastWeatherList> result) {
super.onPostExecute(result);
if (result != null) {
Log.e(TAG, "populate UI recycler view with gson converted data");
listener.afterSearch(result);
} else{
Log.e(TAG, "Result is null");
// check if this Log shows up?
}
}
}

这是我的回收器视图适配器：

public class RecyclerViewAdapter  extends     
RecyclerView.Adapter<RecyclerViewAdapter.ForecastRecycler> {
List<ForecastWeatherList> mForecastWeatherDataList;
public static class ForecastRecycler extends RecyclerView.ViewHolder{
public TextView currentTemp;
public TextView currentHumidity;
public TextView currentDescription;
public ImageView currentIcon;
public ForecastRecycler (View view) {
super (view);
currentTemp = (TextView) view.findViewById(R.id.current_temperature);
currentHumidity = (TextView) view.findViewById(R.id.current_humidity);
currentDescription = (TextView) view.findViewById(R.id.current_weather_description);
currentIcon = (ImageView) view.findViewById(R.id.current_weather_icon);
}
}
public RecyclerViewAdapter(List<ForecastWeatherList> mForecastWeatherDataList, Context mContext) {
this.mForecastWeatherDataList = mForecastWeatherDataList;
}
@Override
public ForecastRecycler onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item, parent, false);
final ForecastRecycler  currentRecycler = new ForecastRecycler(view);
return currentRecycler;
}
@Override
public void onBindViewHolder( ForecastRecycler holder, int position) {
final ForecastWeatherList currentRecycler = mForecastWeatherDataList.get(position);
holder.currentTemp.setText((Double.toString(currentRecycler.getMain().getTemp())));
holder.currentHumidity.setText(currentRecycler.getMain().getHumidity());
holder.currentDescription.setText(currentRecycler.getWeather().getDescription());
Picasso.with(holder.currentIcon.getContext()).load(currentRecycler.getWeather().getIcon());

}
@Override
public int getItemCount() {
return mForecastWeatherDataList.size();
}
}

这是我的日志猫：

ksburneytwo.weathertest E/GetWeatherAync: Response code:200
ksburneytwo.weathertest E/response: java.io.BufferedReader@3d54b14
ksburneytwo.weathertest E/something: 40
ksburneytwo.weathertest E/GetWeatherAync: populate UI recycler view with gson converted data

Answer 1

当异步任务的执行后方法中有数据可用时，您需要将列表发送到回收器视图适配器。

像这样，即

adapter.setList(result);