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安卓车载 SystemUI 通知跨进程传输机制

  • 2026-06-30 00:34:27
安卓车载 SystemUI 通知跨进程传输机制

一句话:通知数据走 Binder IPC,视图走 RemoteViews(Parcelable),SystemUI 拿着"包名+布局ID"去对方进程创建上下文自己 inflate。


一、整体架构:三进程协作

┌──────────┐    Binder     ┌──────────────┐    Binder     ┌──────────────┐
│  APP进程  │ ──────────→ │ system_server │ ──────────→ │  SystemUI进程 │
│          │  notify()(NMS)        │  onNotif()(CarSystemUI)
└──────────┘              └──────────────┘              └──────────────┘
     ↑                        ↑                            ↑
     │                        │                            │
RemoteViewsStatusBarNotificationNotificationListener(Parcelable)(内部数据结构)(AIDL回调接口)
阶段
发送方
接收方
传输内容
IPC 方式
① 发送通知
APP 进程
NMS
Notification(含 RemoteViews)
Binder(AIDL)
② 分发通知
NMS
SystemUI
StatusBarNotification
Binder(INotificationListener)
③ 渲染视图
SystemUI 自身
用包名创建上下文,inflate 布局
进程内

二、详细流程(逐层拆解)

第1步:APP → NMS(Binder 跨进程)

java

// APP 进程NotificationManager.notify(id, notification);
// 内部走 Binder 代理INotificationManager service =getService();// Binder Proxyservice.enqueueNotificationWithTag(pkg, id, notification,...);

传输的数据结构

java

// Notification 实现了 Parcelable,可跨进程序列化Notification{String pkg;// 应用包名int id;NotificationChannel channel;RemoteViews contentView;// ← 关键:视图描述,不是真实 ViewRemoteViews bigContentView;PendingIntent pendingIntent;// 点击意图(也是 Parcelable)}

RemoteViews 不是 View,是"布局说明书":只包含 包名 + 布局资源ID + 文本内容,不包含任何 View 对象。


第2步:NMS 内部处理(system_server 进程)

java

// NotificationManagerService.javavoidenqueueNotificationInternal(...){// 1. 包装成 StatusBarNotificationStatusBarNotification sbn =newStatusBarNotification(...);
// 2. 加入队列(Handler 异步,保证顺序)    mHandler.post(newEnqueueNotificationRunnable(sbn));
// 3. 遍历所有注册的 NotificationListenerServicefor(INotificationListener listener : mListeners){        listener.onNotificationPosted(sbn, rankingMap);// ← Binder 回调}}

关键点

  • NMS 用 Handler.post() 异步分发,避免阻塞主线程
  • mListeners
     列表里存的是所有注册的 NotificationListenerService 的 Binder 代理
  • SystemUI 启动时通过 registerAsSystemService() 把自己的 NotificationListener 注册进来

第3步:NMS → SystemUI(Binder 回调)

这是跨进程传输的核心:

java

// INotificationListener.aidl(AIDL 接口定义)interfaceINotificationListener{voidonNotificationPosted(in StatusBarNotification sbn, in RankingMap rankingMap);voidonNotificationRemoved(in StatusBarNotification sbn, in RankingMap rankingMap);voidonNotificationClick(in StatusBarNotification sbn,int rank);}

java

// SystemUI 侧:NotificationListenerWithPlugins(继承 NotificationListenerService)@OverridepublicvoidonNotificationPosted(StatusBarNotification sbn,RankingMap rankingMap){    mMainHandler.post(()->{// 分发给各个处理器for(NotificationHandler handler : mNotificationHandlers){            handler.onNotificationPosted(sbn, rankingMap);}});}

Binder 回调的数据

字段
说明
sbn.getPackageName()
通知来源包名
sbn.getNotification()
Notification 对象(含 RemoteViews)
sbn.getPostTime()
发布时间
rankingMap
排序权重信息

第4步:SystemUI 渲染通知(最关键的"跨进程视图"问题)

核心问题:RemoteViews 只是一张"图纸",SystemUI 进程怎么把它变成真实的 View?

java

// NotificationEntryManager.javaprivatevoidbindNotification(StatusBarNotification sbn){// 异步加载 RemoteViewsAsyncLayoutInflater.getInstance(context).inflateView(sbn.getNotification().contentView,                     callback);}

RemoteViews.apply() 内部做了什么

java

// RemoteViews.javapublicViewapply(Context context,ViewGroup parent){// 1. 根据包名创建对方应用的上下文Context targetContext = context.createPackageContext(        packageName,Context.CONTEXT_INCLUDE_CODE |Context.CONTEXT_IGNORE_SECURITY);
// 2. 用对方的资源加载器 inflate 布局LayoutInflater inflater =(LayoutInflater) targetContext
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);View view = inflater.inflate(layoutId, parent,false);
// 3. 逐控件设置文本/图片等    view.setTextViewText(R.id.title, title);    view.setImageViewResource(R.id.icon, iconId);
return view;}
步骤
说明
为什么必须这样
createPackageContext(pkgName)
SystemUI 进程创建 APP 进程的上下文
只有对方上下文才能访问对方资源(图标、字符串)
getResources()
拿到 APP 的资源管理器
跨进程不能直接共享 Resources
inflate(layoutId)
生成真实 View 对象
RemoteViews 本身不是 View

所以通知栏里的图标、文字,都是 SystemUI 进程"借用"APP进程的资源渲染出来的,不是 APP 进程直接画的。


三、车载场景的特殊处理

车载特性
SystemUI 通知处理差异
驾驶模式
车速 >30km/h 时,NotificationListener 会过滤低优先级通知(IMPORTANCE_LOW 直接丢弃)
紧急通知CarPropertyManager
 监听车辆状态,倒车/碰撞时强制置顶安全类通知
多用户
车载通常多驾驶员,NMS 用 UserHandle 隔离通知,SystemUI 只显示当前用户的
性能要求
车载要求响应 <16ms,所以 SystemUI 用 AsyncLayoutInflater 异步 inflate,不阻塞主线程
CarSystemUI
复用 SystemUI 通知机制,但增加了 CarNotificationListener 专门处理车控类通知(空调、座椅等)

四、一张图总结完整链路

APP 进程                          system_server                   SystemUI 进程
    │                                 │                              │
    │  notify(id,Notification)       │                              │
    │──────── Binder ────────────────→│                              │
    │                                 │  enqueueNotificationInternal │
    │                                 │  → StatusBarNotification    │
    │                                 │  → mListeners.notifyPosted() │
    │                                 │──────── Binder ─────────────→│
    │                                 │                              │  onNotificationPosted()    │                                 │                              │  → NotificationHandler    │                                 │                              │  → NotificationEntryManager    │                                 │                              │  → AsyncLayoutInflater    │                                 │                              │  → createPackageContext(pkg)    │                                 │                              │  → inflate(layoutId) ← 借用APP资源
    │                                 │                              │  → addView(statusBar)    │                                 │                              │
    │                                 │  ← onNotificationRemoved()   │
    │                                 │←──────── Binder ────────────│

五、关键结论

问题
答案
通知数据怎么跨进程?
Binder + Parcelable
(Notification / StatusBarNotification)
视图怎么跨进程显示?
RemoteViews 传"图纸",SystemUI 用 createPackageContext 自己 inflate
点击通知怎么回传?
PendingIntent 跨进程发送,NMS 收到后调用 onNotificationClick() 回调
车载有什么不同?
CarSystemUI 复用这套机制 + 驾驶模式过滤 + 车辆状态联动优先级

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  1. CONNECT:[ UseTime:0.000636s ] mysql:host=127.0.0.1;port=3306;dbname=c_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000817s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000278s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000472s ]
  6. SELECT * FROM `set` [ RunTime:0.000227s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000502s ]
  8. SELECT * FROM `article` WHERE `id` = 496946 LIMIT 1 [ RunTime:0.000443s ]
  9. UPDATE `article` SET `lasttime` = 1783170127 WHERE `id` = 496946 [ RunTime:0.015909s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000289s ]
  11. SELECT * FROM `article` WHERE `id` < 496946 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000451s ]
  12. SELECT * FROM `article` WHERE `id` > 496946 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001660s ]
  13. SELECT * FROM `article` WHERE `id` < 496946 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.016224s ]
  14. SELECT * FROM `article` WHERE `id` < 496946 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001334s ]
  15. SELECT * FROM `article` WHERE `id` < 496946 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008450s ]
0.115109s