Android 执行doInBackground（）时发生异步错误

Stacktrace:

try{
String data = ((new WeatherHttpClient()).getWeatherData(params[0]));

weather = JSONWeatherParser.getWeather(data);

}catch(RuntimeException e){
  Log.d('',e.getMessage());
}
return weather;

}

---

需要帮忙吗？我自己找不到正确的解决方案。

如果你想运行长时间操作，我建议你在doInBackground内部使用try catch with RuntimeException，我在使用jsoap抓取web内容时也会遇到这个问题。当我将try-catch与RuntimeException一起使用时，错误消失了

编辑：

try{
String data = ((new WeatherHttpClient()).getWeatherData(params[0]));

weather = JSONWeatherParser.getWeather(data);

}catch(RuntimeException e){
  Log.d('',e.getMessage());
}
return weather;

---

顺便说一句，我想你也需要发布你的JSONWeatherParser类，因为我需要知道NullPointerException发生在哪里

你在

getWeatherData

上收到一个

IOException

，返回

null

并执行

JSONWeatherParser.getWeather（数据）data

为

null

时，code>是，但为什么数据为null？

data

为

null

，因为您在

getWeatherData

上接收到

IOException

并返回

null

public String getWeatherData(String place){
    HttpURLConnection connection = null;
    InputStream inputStream = null;

    try {
        connection = (HttpURLConnection) (new URL(Utils.BASE_URL + place)).openConnection();
        connection.setRequestMethod("GET");
        connection.setDoInput(true);
        connection.setDoOutput(true);
        connection.connect();

        //read the response
        StringBuffer stringBuffer = new StringBuffer();
        inputStream = connection.getInputStream();
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));

        String line = null;

        while((line = bufferedReader.readLine()) != null){
            stringBuffer.append(line + "\r\n");
        }



        inputStream.close();
        connection.disconnect();

        return stringBuffer.toString();

    } catch (IOException e) {
        e.printStackTrace();
    }

    return null;
}

try{
String data = ((new WeatherHttpClient()).getWeatherData(params[0]));

weather = JSONWeatherParser.getWeather(data);

}catch(RuntimeException e){
  Log.d('',e.getMessage());
}
return weather;