Android学习系列(7)--App轮询服务器消息

<!--下面会创建一个全局的com.cnblogs.tianxia.message的独立进程--> <service android:name=".service.MessageService" android:label="消息推送" android:process=".message" /> <!--或者--> <!--下面会创建一个应用私有的com.cnblogs.tianxia:message的独立进程--> <service android:name=".service.MessageService" android:label="消息推送" android:process=":message" /> 

public class MessageService extends Service { //获取消息线程 private messagethread messageThread = null; //点击查看 private intent messageIntent = null; private PendingIntent messagePendingIntent = null; //通知栏消息 private int messageNotificationID = 1000; private Notification messageNotification = null; private NotificationManager messageNotificatioManager = null; public IBinder onBind(Intent intent) { return null; } @Override public int onStartCommand(Intent intent, int flags, int startId) { //初始化 messageNotification = new Notification(); messageNotification.icon = R.drawable.icon; messageNotification.tickerText = "新消息"; messageNotification.defaults = Notification.DEFAULT_SOUND; messageNotificatioManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE); messageIntent = new Intent(this, MessageActivity.class); messagePendingIntent = PendingIntent.getActivity(this,0,messageIntent,0); //开启线程 messageThread = new MessageThread(); messageThread.isRunning = true; messageThread.start(); return super.onStartCommand(intent, flags, startId); } /** * 从服务器端获取消息 * */ class MessageThread extends Thread{ //运行状态，下一步骤有大用 public boolean isRunning = true; public void run() { while(isRunning){ try { //休息10分钟 Thread.sleep(600000); //获取服务器消息 String serverMessage = getServerMessage(); if(serverMessage!=null&&!"".equals(serverMessage)){ //更新通知栏 messageNotification.setLatestEventInfo(MessageService.this, "新消息","奥巴马宣布,本拉登兄弟挂了!"+serverMessage,messagePendingIntent); messageNotificatioManager.notify(messageNotificationID, messageNotification); //每次通知完，通知ID递增一下，避免消息覆盖掉 messageNotificationID++; } } catch (InterruptedException e) { e.printStackTrace(); } } } } /** * 这里以此方法为服务器Demo，仅作示例 * @return 返回服务器要推送的消息，否则如果为空的话，不推送 */ public String getServerMessage(){ return "YES!"; } } 

boolean isMessagePush = true;//不开启就设置为false; ... if(isMessagePush){ startService(new Intent(this, MessageService.class)) };

stopService(new Intent(MyActivity.this,MessageService.class)); setMessagePush(false);//设置配置文件或数据库中flag为false 

//杀死该线程所在的进程，自然就退出了 System.exit(0); 

//前面说到了isRunning这个标志，设置为false后，线程的执行就从while循环中跳出来了，然后自然结束掉了 messageThread.isRunning = false; 

 @Override public void onDestroy() { System.exit(0); //或者，二选一，推荐使用System.exit(0)，这样进程退出的更干净 //messageThread.isRunning = false; super.onDestroy(); }