Service详解

 1 /**
 2  *  后台执行的定时任务
 3  */
 4 public class LongRunningService extends Service {
 5 
 6     @Override
 7     public IBinder onBind(Intent intent) {
 8         return null;
 9     }
10 
11     @Override
12     public int onStartCommand(Intent intent,int flags,int startId) {
13     
14         new Thread(){
15             public void run() {
16                 Log.i("TAG","LongRunningService exec at " + new Date().toString());
17             };
18         }.start();
19         
20         //获取Alarm管理对象
21         AlarmManager manager = (AlarmManager)getSystemService(ALARM_SERVICE);
22         
23         //设置执行的时间间隔
24         long triggerAtTime = SystemClock.elapsedRealtime() + 5 * 1000; 
25         
26         //获取一个能够执行广播的 PendingIntent。 这样当定时任务被触发的时候，广播接收器的 
27          onReceive()方法就可以得到执行。
28         Intent intent2 = new Intent(this,AlarmReceiver.class);
29         PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent2, 0);
30         
31         //设置一个定时任务
32         manager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, triggerAtTime, pendingIntent);
34         return super.onStartCommand(intent,flags,startId);
35     }
36 }

2 public class AlarmReceiver extends BroadcastReceiver {
3     @Override
4     public void onReceive(Context context,Intent intent) {
5         Intent intent2 = new Intent(context, LongRunningService.class);
6         context.startService(intent2);
7     }
8 }

 1 /**
 2  *  前台服务
 3  */
 4 public class ForegroundService extends Service {
 5 
 6     @Override
 7     public IBinder onBind(Intent intent) {
 8         return null;
 9     }
10     
11     @Override
12     public void onCreate() {
13         Intent intent = new Intent(this,MainActivity.class);
14         PendingIntent pendingIntent = PendingIntent.getActivity(this,0,intent,0);
15         
16         Notification nf = new Notification(R.drawable.p1,"有一条通知",System.currentTimeMillis());
18         nf.setLatestEventInfo(this,"这是通知的标题","这是通知的内容",pendingIntent);
19         nf.flags = Notification.FLAG_AUTO_CANCEL;
20         //调用这个方法将服务变为前台服务，并在系统通知栏显示出来
21         startForeground(1,nf);
22         
23         super.onCreate();
24     }
25 }