获得真实世界的时间

Question

I use this code for get real world time from internet:

        try
          {
            HttpClient httpClient = new DefaultHttpClient();
            HttpResponse httpResponse = httpClient.execute( new HttpGet( "http://developer.yahooapis.com/TimeService/V1/getTime?appid=YahooDemo"));
            StatusLine statusLine = httpResponse.getStatusLine();
            if( statusLine.getStatusCode() == HttpStatus.SC_OK)
              {
                ByteArrayOutputStream byteTimeStamp = new ByteArrayOutputStream();
                httpResponse.getEntity().writeTo( byteTimeStamp);
                byteTimeStamp.close();
                String sTimeStamp = byteTimeStamp.toString(); // this data contains real world time, I now can parse it...
              }
             else
              httpResponse.getEntity().getContent().close();
          }
         catch( Exception e) {}

This code work perfectly. But it use yahoo-service and depends them availability.

I use second way with GPS-locations service, but this way work requires add permissions

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

This is not good idea.

I need another way for get real world time. Any ideas please.

Also I need get world time with millisecounds, if it possible.

Answer 1

One possibility is using Apache software, for example for DAYTIME protocol DaytimeUDPClient . Then you can interprete the output by help of SimpleDateFormat . Another more precise solution would be based on SNTP.