执行网络操作是耗时操作,即便是在service中也要放到子线程中执行

这里我用到了async-http-client框架来执行异步请求操作

计时用的java原生Timer和TimerTask类

本来这两者分开操作各没有问题

但是如果把异步操作写到TimerTask的run方法里就会出错

E/AndroidRuntime(5799): java.lang.IllegalArgumentException: Synchronous ResponseHandler used in AsyncHttpClient. You should create your response handler in a looper thread or use SyncHttpClient instead.

解决办法之一就是把AsyncHttpClient换成SyncHttpClient.

下面是修改过的代码:

计时部分:

public void countTime(){                TimerTask task = new TimerTask() {            public void run() {                cityWeather(url, key, "深圳");            }        };        Timer timer = new Timer(true);//true:守护线程        timer.schedule(task, 1000, 10000); // 延时1000ms后执行，10000ms执行一次        // timer.cancel(); //退出计时器    }

请求网络部分:

public void cityWeather(String url,String key,String cityName){        String httpArg = "cityname="+cityName;        String httpUrl = url + "?" + httpArg;        SyncHttpClient client = new SyncHttpClient();//这里改成Synchttpclient        client.addHeader("apikey", key);        client.get(httpUrl, new AsyncHttpResponseHandler(){            @Override            public void onSuccess(int statusCode, Header[] headers,                    byte[] responseBody) {                 String responseString  = new String (responseBody);                    try {                        JSONObject jsonObject = new JSONObject(responseString);                        JSONObject retData = jsonObject.getJSONObject("retData");                                                String city = retData.getString("city");                        String weather = retData.getString("weather");                        String temp = retData.getString("temp");                        String l_tmp = retData.getString("l_tmp");                        String h_tmp = retData.getString("h_tmp");                        String WD = retData.getString("WD");                        String WS = retData.getString("WS");                        resultString = (city+","+weather+" ,气温:"+temp+"度\r\n"+                        "最高温度:"+h_tmp+" 最低温度:"+l_tmp+"\r\n"+"风向:"+WD+" , 风力:"+WS);                    } catch (JSONException e) {                        e.printStackTrace();                    }            }            @Override            public void onFailure(int statusCode, Header[] headers,                    byte[] responseBody, Throwable error) {                Toast.makeText(MyService.this, ""+statusCode, 0);            }});    }