Android:如何每10秒通过服务发送一次HTTP请求
我需要每10秒从服务器收到一个状态。
我试图通过服务发送一个http请求来做到这一点。
问题是我的代码只能执行一次。
这是我的服务代码:
public class ServiceStatusUpdate extends Service {@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
while(true)
{
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
new DoBackgroundTask().execute(Utilities.QUERYstatus);
e.printStackTrace();
}
return START_STICKY;
}
}
private class DoBackgroundTask extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... params) {
String response = "";
String dataToSend = params[0];
Log.i("FROM STATS SERVICE DoBackgroundTask", dataToSend);
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(Utilities.AGENT_URL);
try {
httpPost.setEntity(new StringEntity(dataToSend, "UTF-8"));
// Set up the header types needed to properly transfer JSON
httpPost.setHeader("Content-Type", "application/json");
httpPost.setHeader("Accept-Encoding", "application/json");
httpPost.setHeader("Accept-Language", "en-US");
// Execute POST
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity responseEntity = httpResponse.getEntity();
if (responseEntity != null) {
response = EntityUtils.toString(responseEntity);
} else {
response = "{\"NO DATA:\"NO DATA\"}";
}
} catch (ClientProtocolException e) {
response = "{\"ERROR\":" + e.getMessage().toString() + "}";
} catch (IOException e) {
response = "{\"ERROR\":" + e.getMessage().toString() + "}";
}
return response;
}
@Override
protected void onPostExecute(String result) {
Utilities.STATUS = result;
Log.i("FROM STATUS SERVICE: STATUS IS:", Utilities.STATUS);
super.onPostExecute(result);
}
}
}
谢谢很多阿维
回答:
将处理程序放入onPostExecute中以在10秒后发送http请求
new Handler().postDelayed(new Runnable() { public void run() {
requestHttp();
}
}, 10000);
10秒后,将再次执行doInBackground,然后再次执行onPostExecute,再次处理程序,依此类推。
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