SystemServer启动（main方法被调用）

public final class SystemServer {     public static void main(String[] args) {         new SystemServer().run();     }     private void run() {         mSystemServiceManager = new SystemServiceManager(mSystemContext);         mSystemServiceManager.startService(NotificationManagerService.class);     } } NotificationManagerService启动（onStart方法被调用） public class SystemServiceManager {     public SystemService startService(String className) {         1. 反射创建NotificationManagerService对象         2. 调用NotificationManagerService#onStart()方法     } } NotificationManagerService#onStart()初始化 public class NotificationManagerService extends SystemService {     private final IBinder mService = new INotificationManager.Stub() {}         public void onStart() {          1. 公布mService，添加到ServiceManager     } } NotificationManager#getService()拿到INotificationManager对象 public class NotificationManager {     private static INotificationManager sService     static public INotificationManager getService() {         if (sService != null) {             return sService;         }         IBinder b = ServiceManager.getService("notification");         sService = INotificationManager.Stub.asInterface(b);         return sService;     } } NotificationManager通过INotificationManager接口调用NotificationManagerService里的INotificationManager.Stub()对象 public class NotificationManagerService extends SystemService {     private final IBinder mService = new INotificationManager.Stub() {          1. 取消通知          2. 获取当前通知          3. 注册监听器NotificationListenerService#INotificationListener          3. 取消监听器NotificationListenerService#INotificationListener     } } NotificationListenerService 里封装了INotificationListener对象 NotificationListenerService extends Service {     private INotificationListenerWrapper mWrapper = null;     private class INotificationListenerWrapper extends INotificationListener.Stub {}     1. 创建INotificationListenerWrapper对象     2. 通过INotificationManager注册INotificationListener } 实现INotificationListener回调接口 oneway interface INotificationListener {     void onListenerConnected(in NotificationRankingUpdate update);     void onNotificationPosted(in IStatusBarNotificationHolder notificationHolder,             in NotificationRankingUpdate update);     void onNotificationRemoved(in IStatusBarNotificationHolder notificationHolder,             in NotificationRankingUpdate update);     void onNotificationRankingUpdate(in NotificationRankingUpdate update);     void onListenerHintsChanged(int hints);     void onInterruptionFilterChanged(int interruptionFilter); }