google了一段时间发现没人写notification在framework中具体怎么实现的，感到很奇怪，是我搜索有问题？哎，不管了，反正工作需要，自己琢磨琢磨吧。
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相关文件:
framework/base/core/java/android/app/NotificationManager.java
framework/base/services/java/com/android/server/NotificationManag[email protected]} extends INotificationManager.Stub
framework/base/services/java/com/android/server/StatusBarManagerService.java ?extends IStatusBarService.Stub
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framework/base/core/java/com/android/internal/statusbar/StatusBarNotification ?implements Parcelable
framework/base/core/java/com/android/internal/statusbar/IStatusBar.aidl
framework/base/core/java/com/android/internal/statusbar/IStatusBarService.aidl
framework/base/core/java/com/android/internal/statusbar/StatusBarNotification.aidl
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framework/base/packages/SystemUI/src/com/android/systemui/statusbar/StatusBarService.java extends Service implements CommandQueue.Callbacks
framework/base/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java extends IStatusBar.Stub
try { Slog.i(TAG, "Status Bar"); statusBar = new StatusBarManagerService(context); ServiceManager.addService(Context.STATUS_BAR_SERVICE, statusBar);} catch (Throwable e) { Slog.e(TAG, "Failure starting StatusBarManagerService", e);} try { Slog.i(TAG, "Notification Manager"); notification = new NotificationManagerService(context, statusBar, lights); ServiceManager.addService(Context.NOTIFICATION_SERVICE, notification);} catch (Throwable e) { Slog.e(TAG, "Failure starting Notification Manager", e);} ?public IBinder addNotification(StatusBarNotification notification) { synchronized (mNotifications) { IBinder key = new Binder(); mNotifications.put(key, notification); if (mBar != null) { try { mBar.addNotification(key, notification); } catch (RemoteException ex) { } } return key; } }volatile IStatusBar mBar;
public void registerStatusBar(IStatusBar bar, StatusBarIconList iconList, List<IBinder> notificationKeys, List<StatusBarNotification> notifications) { enforceStatusBarService(); Slog.i(TAG, "registerStatusBar bar=" + bar); mBar = bar; synchronized (mIcons) { iconList.copyFrom(mIcons); } synchronized (mNotifications) { for (Map.Entry<IBinder,StatusBarNotification> e: mNotifications.entrySet()) { notificationKeys.add(e.getKey()); notifications.add(e.getValue()); } } }?framework/base/packages/SystemUI/src/com/android/systemui/statusbar/CommandQueue.java实现IStatusBar.java接口，public void addNotification(IBinder key, StatusBarNotification notification) { synchronized (mList) { NotificationQueueEntry ne = new NotificationQueueEntry(); ne.key = key; ne.notification = notification; mHandler.obtainMessage(MSG_ADD_NOTIFICATION, 0, 0, ne).sendToTarget(); //这句话对应的mHandler执行语句是： // final NotificationQueueEntry ne = (NotificationQueueEntry)msg.obj; // mCallbacks.addNotification(ne.key, ne.notification); //也就是调用回调函数里面的addNotification。 } } mCommandQueue = new CommandQueue(this, iconList);//StatusBarService实现了CommandQueue中的CommandQueue.Callbacks接口 mBarService = IStatusBarService.Stub.asInterface( ServiceManager.getService(Context.STATUS_BAR_SERVICE)); try { //将IStatusBar实现类的对象传递到StatusBarManagerService.java中，这里的mCommandQueue就是上面对应的mBar啦。 mBarService.registerStatusBar(mCommandQueue, iconList, notificationKeys, notifications); } catch (RemoteException ex) { // If the system process isn't there we're doomed anyway. }??最终执行状态栏更新通知等事件都是在实现的CommandQueue.Callbacks里面执行。还是以addNotification为例：
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public void addNotification(IBinder key, StatusBarNotification notification) { boolean shouldTick = true; if (notification.notification.fullScreenIntent != null) { shouldTick = false; Slog.d(TAG, "Notification has fullScreenIntent; sending fullScreenIntent"); try { notification.notification.fullScreenIntent.send(); } catch (PendingIntent.CanceledException e) { } } StatusBarIconView iconView = addNotificationViews(key, notification); if (iconView == null) return; //。。。以下省略N字。?
3>.上面是提供相关功能的一些类，具体的notification的管理类是framework/base/services/java/com/android/server/NotificationManagerService.java，从该类的定义public class NotificationManagerService extends INotificationManager.Stub可以知道
他是用来实现接口中INotificationManager中定义的相关方法并向外部提供服务的类。主要向外提供public void enqueueNotificationWithTag(String pkg, String tag, int id, Notification notification,int[] idOut)方法。该方法实际上是调用public void enqueueNotificationInternal(String pkg, int callingUid, int callingPid,String tag, int id, Notification notification, int[] idOut)，他里面提供了notification的具体处理方法。
摘取部分代码片段看看：?
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if (notification.icon != 0) { StatusBarNotification n = new StatusBarNotification(pkg, id, tag, r.uid, r.initialPid, notification); if (old != null && old.statusBarKey != null) { r.statusBarKey = old.statusBarKey; long identity = Binder.clearCallingIdentity(); try { mStatusBar.updateNotification(r.statusBarKey, n); } finally { Binder.restoreCallingIdentity(identity); } } else { //省略。。。?
?当判断好需要更新通知的时候调用mStatusBar.updateNotification(r.statusBarKey, n);方法，这个就是StatusBarManagerService.java中的addNotification方法，这样就进入上面所说的处理流程了。
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4>. 在3中的NotificationManagerService.java是管理notification的服务，服务嘛就是用来调用的，调用他的就是大家熟悉的NotificationManager了。
在NotificationManager.java中，有一个隐藏方法，用来得到INotificationManager接口对应的服务提供类，也就是NotificationManagerService了。
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/** @hide */ static public INotificationManager getService() { if (sService != null) { return sService; } IBinder b = ServiceManager.getService("notification"); sService = INotificationManager.Stub.asInterface(b); return sService; }?再看看更熟悉的notify方法，其实是执行：
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public void notify(String tag, int id, Notification notification) { int[] idOut = new int[1]; INotificationManager service = getService(); String pkg = mContext.getPackageName(); if (localLOGV) Log.v(TAG, pkg + ": notify(" + id + ", " + notification + ")"); try { service.enqueueNotificationWithTag(pkg, tag, id, notification, idOut); if (id != idOut[0]) { Log.w(TAG, "notify: id corrupted: sent " + id + ", got back " + idOut[0]); } } catch (RemoteException e) { } }?service.enqueueNotificationWithTag(pkg, tag, id, notification, idOut);也就是3中提到的那个对外公开的服务方法了，这样就进入了上面提到的处理流程了。
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