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我正在尝试使用 Async 类获取数据，但我没有获取数据，而是得到了 NegativeArraySizeException。虽然所有其他事情都是正确的，但我不知道我犯了什么错误。

下面是我用来获取数据的代码：

private class FetchData extends AsyncTask<Object, Void, String>
{

    @Override
    protected String doInBackground(Object... arg0) {

        int responseCode = -1;
        try 
        {
            URL apiURL = new URL("http://api.openweathermap.org/data/2.5/weather?q=london&mode=json&units=metric");
            HttpURLConnection connection = (HttpURLConnection) apiURL.openConnection();
            connection.connect();

            responseCode = connection.getResponseCode();
            if(responseCode == HttpURLConnection.HTTP_OK)
            {
                InputStream inputStream = connection.getInputStream();
                Reader reader = new InputStreamReader(inputStream);
                int contentLength = connection.getContentLength();
                char[] charArray = new char[contentLength];
                reader.read(charArray);
                String responseData = new String(charArray);

                JSONObject jsonResponse = new JSONObject(responseData);

                JSONArray weather_icon  = jsonResponse.getJSONArray("weather");
                 JSONObject obj_icon = weather_icon.getJSONObject(0);
                 String icon = obj_icon.getString("icon");
                 String status = obj_icon.getString("description");

                 String location = jsonResponse.getString("name");

                 JSONObject main  = jsonResponse.getJSONObject("main");
                 String tempreature = main.getString("temp");

                 String humidity = main.getString("humidity");
                 String pressure = main.getString("pressure");


                 pTempreature = tempreature;
                 pHumidity = humidity;
                 pPressure = pressure;
                 pLocation = location;
                 pStatus = status;
                 pIcon = icon;


                 Intent i = new Intent(MainActivity.this, DisplayData.class);
                 i.putExtra("tem", tempreature);
                 i.putExtra("ico", icon);
                 i.putExtra("hum", humidity);
                 i.putExtra("pre", pressure);
                 i.putExtra("stat", status);
                 i.putExtra("loc", location);
                 startActivity(i);

            }




        }
        catch (MalformedURLException e)
        {
            Log.e("log_tag","Error In URL"+e.toString());
        }
        catch (IOException e)
        {
            Log.e("log_tag","Error In URL"+e.toString());
        }
        catch (Exception e)
        {
            Log.e("log_tag","Error In URL"+e.toString());
        }

        return "Code :"+responseCode;
    }
}
4

1 回答 1

0

我没有运行您的代码，但您可能遇到以下问题：

char[] charArray = new char[contentLength];

正如我通过此页面检查的那样，没有为您的 url 设置内容长度，因此您在 contentLength 中得到 -1。试试这个代码来获取你的内容：

StringBuffer buffer = new StringBuffer();

            if (inputStream == null) {
                // Nothing to do.
                return null;
            }
            reader = new BufferedReader(new InputStreamReader(inputStream));

            String line;
            while ((line = reader.readLine()) != null) {
                // Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
                // But it does make debugging a *lot* easier if you print out the completed
                // buffer for debugging.
                buffer.append(line + "\n");
            }

            if (buffer.length() == 0) {
                // Stream was empty.  No point in parsing.
                return null;
            }
            forecastJsonStr = buffer.toString();
于 2014-11-29T18:43:05.700 回答