android 一个简单的服务例子

  1 public class MessageService extends Service {
  2 
  3     // 获取消息线程
  4     private MessageThread messageThread = null;
  5 
  6     // 点击查看
  7     private Intent messageIntent = null;
  8     private PendingIntent messagePendingIntent = null;
  9 
 10     // 通知栏消息
 11     private int messageNotificationID = 1000;
 12     private Notification messageNotification = null;
 13     private NotificationManager messageNotificatioManager = null;
 14     private final IBinder binder = new MessageService.LocalBinder();
 15 
 16     @Override
 17     public IBinder onBind(final Intent intent) {
 18         return binder;
 19     }
 20 
 21     // 定义内容类继承Binder
 22     class LocalBinder extends Binder {
 23         // 返回本地服务
 24         // 可以返回这个服务，然后<bold>activity可以通过服务调用服务的方法</bold>了。
 25         MessageService getService() {
 26             return MessageService.this;
 27         }
 28 
 29     }
 30 
 31     @Override
 32     public int onStartCommand(final Intent intent, final int flags,
 33             final int startId) {
 34         // 初始化
 35         messageNotification = new Notification();
 36         messageNotification.icon = R.drawable.ic_launcher;
 37         messageNotification.tickerText = "新消息";
 38         messageNotification.defaults = Notification.DEFAULT_SOUND;
 39         messageNotificatioManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 40 
 41         messageIntent = new Intent(this, MessageActivity.class);
 42         messagePendingIntent = PendingIntent.getActivity(this, 0,
 43                 messageIntent, 0);
 44 
 45         // 开启线程
 46         messageThread = new MessageThread();
 47         messageThread.isRunning = true;
 48         messageThread.start();
 49 
 50         return super.onStartCommand(intent, flags, startId);
 51     }
 52 
 53     /**
 54      * 从服务器端获取消息
 55      * 
 56      */
 57     class MessageThread extends Thread {
 58         // 运行状态，下一步骤有大用
 59         public boolean isRunning = true;
 60 
 61         @Override
 62         public void run() {
 63             while (isRunning) {
 64                 try {
 65                     // 休息15s
 66                     Thread.sleep(15 * 1000);
 67                     // 获取服务器消息
 68                     String serverMessage = getServerMessage();
 69                     if (serverMessage != null && !"".equals(serverMessage)) {
 70                         // 更新通知栏
 71                         messageNotification.setLatestEventInfo(
 72                                 MessageService.this, "新消息", "奥巴马宣布,本拉登兄弟挂了!"
 73                                         + serverMessage, messagePendingIntent);
 74                         messageNotificatioManager.notify(messageNotificationID,
 75                                 messageNotification);
 76                         // 每次通知完，通知ID递增一下，避免消息覆盖掉
 77                         messageNotificationID++;
 78                     }
 79                 } catch (InterruptedException e) {
 80                     e.printStackTrace();
 81                 }
 82             }
 83         }
 84     }
 85 
 86     /**
 87      * 这里以此方法为服务器Demo，仅作示例
 88      * 
 89      * @return 返回服务器要推送的消息，否则如果为空 的话，不推送
 90      */
 91     public String getServerMessage() {
 92         return "YES!";
 93     }
 94 
 95     @Override
 96     public void onDestroy() {
 97         System.exit(0);
 98         // 或者，二选一，推荐使用System.exit(0)，这样进程退出的更干净
 99         // messageThread.isRunning = false;
100         super.onDestroy();
101     }
102 }