(原创)在service中定时执行网络操作的几点说明

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);

            }});

    }

(原创)在service中定时执行网络操作的几点说明的相关教程结束。