1 import java.net.URL;
 2 import java.net.URLConnection;
 3 
 4 public class SynchronizeTimeThread implements Runnable {
 5 
 6     @Override
 7     public void run() {
 8         while (true){
 9             visitURL("https://www.baidu.com/");
10             try {
11                 Thread.sleep(360000);//定时更新
12             } catch (InterruptedException e) {
13                 e.printStackTrace();
14             }
15         }
16     }
17 
18     /**
19      * 网址访问
20      *
21      * @param url 网址
22      * @return urlDate 对象网址时间
23      * 
24      */
25     private void visitURL(String url) {
26         try {
27             URL url1 = new URL(url);
28             URLConnection conn = url1.openConnection();  //生成连接对象
29             conn.connect();  //连接对象网页
30             Long date = conn.getDate();
31             if (date!=null){
32                 SystemClock.setCurrentTimeMillis(date);
33             }
34         } catch (Exception e) {
35             e.printStackTrace();
36             37         }
38     }
39 }

1  //更新系统时间
2     private void toSynchronizeSystemTime(){
3         AlarmManager mAlarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);//获取服务
4         mAlarmManager.setTimeZone("Asia/Shanghai");//上海
5         Thread thread = new Thread(new SynchronizeTimeThread());
6         thread.setName("ToGetTime");
7         thread.start();
8     }