StatusBar Notifaction
简介
本文介绍了系统产生一个notifaction产生的流程，提供了如何在流程中加入拦截，拦截掉第三方应用的notification.
StatusBar通过Notifaction初始化通知条
PhoneStatusBar ->BaseStatusBar
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boot 引导文件启动
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SystemUIserVice
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private final Class<?>[] SERVICES = new Class[] { com.android.systemui.tuner.TunerService.class, //定制状态栏服务 com.android.systemui.keyguard.KeyguardViewMediator.class,//锁屏模块 com.android.systemui.recents.Recents.class,//最近应用 com.android.systemui.volume.VolumeUI.class,//全局音量控制 com.android.systemui.statusbar.SystemBars.class,//系统状态栏 com.android.systemui.usb.StorageNotification.class,//Storage存储通知 com.android.systemui.power.PowerUI.class,//电量管理相关 com.android.systemui.media.RingtonePlayer.class,//铃声播放 com.android.systemui.keyboard.KeyboardUI.class,//键盘相关 };
这里的service只是继承了SystemUI类的普通对象而已。
执行SystemBars.start()后，通过反射机制,最终得到BaseStatusBar对象。 这里需要说明的是BaseStatusBar是PhoneStatusBar的父类。
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SystemUI ->start()
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BaseStatusBar start():
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public void start() { //注册服务 mWindowManager = (WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE); mWindowManagerService = WindowManagerGlobal.getWindowManagerService(); mDisplay = mWindowManager.getDefaultDisplay(); mDevicePolicyManager = (DevicePolicyManager)mContext.getSystemService( Context.DEVICE_POLICY_SERVICE); mNotificationData = new NotificationData(this); mAccessibilityManager = (AccessibilityManager) mContext.getSystemService(Context.ACCESSIBILITY_SERVICE); mDreamManager = IDreamManager.Stub.asInterface( ServiceManager.checkService(DreamService.DREAM_SERVICE)); mPowerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE); mContext.getContentResolver().registerContentObserver( Settings.Global.getUriFor(Settings.Global.DEVICE_PROVISIONED), true, mSettingsObserver); mContext.getContentResolver().registerContentObserver( Settings.Global.getUriFor(Settings.Global.ZEN_MODE), false, mSettingsObserver); //设置锁屏通知 观察者 在 子类变成 mHeadsUpObserver mContext.getContentResolver().registerContentObserver( Settings.Secure.getUriFor(Settings.Secure.LOCK_SCREEN_SHOW_NOTIFICATIONS), false, mSettingsObserver, UserHandle.USER_ALL); if (ENABLE_LOCK_SCREEN_ALLOW_REMOTE_INPUT) { mContext.getContentResolver().registerContentObserver( Settings.Secure.getUriFor(Settings.Secure.LOCK_SCREEN_ALLOW_REMOTE_INPUT), false, mSettingsObserver, UserHandle.USER_ALL); } //锁屏通知监听者 当url 变化时 调用change 方法 于初始化有关 mContext.getContentResolver().registerContentObserver( Settings.Secure.getUriFor(Settings.Secure.LOCK_SCREEN_ALLOW_PRIVATE_NOTIFICATIONS), true, mLockscreenSettingsObserver, UserHandle.USER_ALL); mBarService = IStatusBarService.Stub.asInterface( ServiceManager.getService(Context.STATUS_BAR_SERVICE)); mRecents = getComponent(Recents.class); final Configuration currentConfig = mContext.getResources().getConfiguration(); mLocale = currentConfig.locale; mLayoutDirection = TextUtils.getLayoutDirectionFromLocale(mLocale); mFontScale = currentConfig.fontScale; mDensity = currentConfig.densityDpi; mUserManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE); mKeyguardManager = (KeyguardManager) mContext.getSystemService(Context.KEYGUARD_SERVICE); mLockPatternUtils = new LockPatternUtils(mContext); // Connect in to the status bar manager service 连接到状态栏管理器服务 mCommandQueue = new CommandQueue(this); int[] switches = new int[9]; ArrayList<IBinder> binders = new ArrayList<IBinder>(); ArrayList<String> iconSlots = new ArrayList<>(); ArrayList<StatusBarIcon> icons = new ArrayList<>(); Rect fullscreenStackBounds = new Rect(); Rect dockedStackBounds = new Rect(); try { mBarService.registerStatusBar(mCommandQueue, iconSlots, icons, switches, binders, fullscreenStackBounds, dockedStackBounds); } catch (RemoteException ex) { // If the system process isn't there we're doomed anyway. } //创建视图 createAndAddWindows(); //创建视图 mSettingsObserver.onChange(false); // set up disable(switches[0], switches[6], false /* animate */); setSystemUiVisibility(switches[1], switches[7], switches[8], 0xffffffff, fullscreenStackBounds, dockedStackBounds); topAppWindowChanged(switches[2] != 0); // StatusBarManagerService has a back up of IME token and it's restored here. setImeWindowStatus(binders.get(0), switches[3], switches[4], switches[5] != 0); // Set up the initial icon state int N = iconSlots.size(); int viewIndex = 0; for (int i=0; i < N; i++) { setIcon(iconSlots.get(i), icons.get(i)); } // Set up the initial notification state. 设置初始通知状态 try { //设置监听 ，当发生通知产生 移除 ，更新时 会在其中调用相应方法 mNotificationListener.registerAsSystemService(mContext, new ComponentName(mContext.getPackageName(), getClass().getCanonicalName()), UserHandle.USER_ALL); } catch (RemoteException e) { Log.e(TAG, "Unable to register notification listener", e); } if (DEBUG) { Log.d(TAG, String.format( "init: icons=%d disabled=0x%08x lights=0x%08x menu=0x%08x imeButton=0x%08x", icons.size(), switches[0], switches[1], switches[2], switches[3] )); } //注册广播 mCurrentUserId = ActivityManager.getCurrentUser(); setHeadsUpUser(mCurrentUserId); IntentFilter filter = new IntentFilter(); filter.addAction(Intent.ACTION_USER_SWITCHED); filter.addAction(Intent.ACTION_USER_ADDED); filter.addAction(Intent.ACTION_USER_PRESENT); mContext.registerReceiver(mBroadcastReceiver, filter); IntentFilter internalFilter = new IntentFilter(); internalFilter.addAction(WORK_CHALLENGE_UNLOCKED_NOTIFICATION_ACTION); internalFilter.addAction(BANNER_ACTION_CANCEL); internalFilter.addAction(BANNER_ACTION_SETUP); mContext.registerReceiver(mBroadcastReceiver, internalFilter, PERMISSION_SELF, null); IntentFilter allUsersFilter = new IntentFilter(); allUsersFilter.addAction( DevicePolicyManager.ACTION_DEVICE_POLICY_MANAGER_STATE_CHANGED); mContext.registerReceiverAsUser(mAllUsersReceiver, UserHandle.ALL, allUsersFilter, null, null); updateCurrentProfilesCache(); IVrManager vrManager = IVrManager.Stub.asInterface(ServiceManager.getService("vrmanager")); try { vrManager.registerListener(mVrStateCallbacks); } catch (RemoteException e) { Slog.e(TAG, "Failed to register VR mode state listener: " + e); } }
由上面代码可见start()方法中主要做了如下操作：
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- 绑定Oberver mContext.getContentResolver().registerContentObserver( Settings.Secure.getUriFor(Settings.Secure.LOCK_SCREEN_ALLOW_PRIVATE_NOTIFICATIONS), true, mLockscreenSettingsObserver, UserHandle.USER_ALL); - 设置监听 ，当发生通知产生 移除，更新时 会在其中调用相应方法 mNotificationListener.registerAsSystemService(mContext, new ComponentName(mContext.getPackageName(), getClass().getCanonicalName()), UserHandle.USER_ALL); - 初始化通知视图 createAndAddWindows(); - 注册广播 mContext.registerReceiver(mBroadcastReceiver, filter);` 本次分析只分析和Notifaction 相关的部分 `
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其中的 mBroadcastReceiver 这个广播接受者 其中处理了notifaction 的事情：
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private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if (Intent.ACTION_USER_SWITCHED.equals(action)) { ....... } else if (Intent.ACTION_USER_ADDED.equals(action)) { updateCurrentProfilesCache(); } else if (Intent.ACTION_USER_PRESENT.equals(action)) { ....... } else if (BANNER_ACTION_CANCEL.equals(action) || BANNER_ACTION_SETUP.equals(action)) { NotificationManager noMan = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE); noMan.cancel(R.id.notification_hidden); Settings.Secure.putInt(mContext.getContentResolver(), Settings.Secure.SHOW_NOTE_ABOUT_NOTIFICATION_HIDING, 0); if (BANNER_ACTION_SETUP.equals(action)) { animateCollapsePanels(CommandQueue.FLAG_EXCLUDE_RECENTS_PANEL, true /* force */); mContext.startActivity(new Intent(Settings.ACTION_APP_NOTIFICATION_REDACTION) .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK) ); } } else if (WORK_CHALLENGE_UNLOCKED_NOTIFICATION_ACTION.equals(action)) { ......... } };
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mNotificationListener 此监听为分析的重点，这里负责新notification 产生后视图的创建和销毁
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```java
private final NotificationListenerService mNotificationListener =
new NotificationListenerService() {
@Override
public void onListenerConnected() {
if (DEBUG) Log.d(TAG, "onListenerConnected");
final StatusBarNotification[] notifications = getActiveNotifications();
final RankingMap currentRanking = getCurrentRanking();
mHandler.post(new Runnable() {
@Override
public void run() {
for (StatusBarNotification sbn : notifications) {
android.util.Log.d("czh","init notification ");
addNotification(sbn, currentRanking, null /* oldEntry */);
}
}
});
}
@Override
public void onNotificationPosted(final StatusBarNotification sbn,
final RankingMap rankingMap) {
/// M: Enable this log for unusual case debug.
/*if (DEBUG)*/ Log.d(TAG, "onNotificationPosted: " + sbn);
if (sbn != null) {
//redmine115450 duxinyun modify powsave music 20180103 begin
String packageName = sbn.getPackageName();
int open = Settings.System.getInt(mContext.getContentResolver(), Settings.System.POWER_SAVE_SWITCH, 0);
if(open==1 && !"com.android.mms".equalsIgnoreCase(packageName)&&
!"com.android.calculator2".equalsIgnoreCase(packageName)&&
!"com.android.deskclock".equalsIgnoreCase(packageName)&&
!"com.android.soundrecorder".equalsIgnoreCase(packageName)&&
!"com.android.dialer".equalsIgnoreCase(packageName)){
removeNotification(sbn.getKey(), rankingMap);
return;
}
//redmine115450 duxinyun modify powsave music 20180103 end
mHandler.post(new Runnable() {
@Override
public void run() {
processForRemoteInput(sbn.getNotification());
String key = sbn.getKey();
mKeysKeptForRemoteInput.remove(key);
boolean isUpdate = mNotificationData.get(key) != null;
// In case we don't allow child notifications, we ignore children of
// notifications that have a summary, since we're not going to show them
// anyway. This is true also when the summary is canceled,
// because children are automatically canceled by NoMan in that case.
if (!ENABLE_CHILD_NOTIFICATIONS
&& mGroupManager.isChildInGroupWithSummary(sbn)) {
if (DEBUG) {
Log.d(TAG, "Ignoring group child due to existing summary: " + sbn);
}
// Remove existing notification to avoid stale data.
if (isUpdate) {
removeNotification(key, rankingMap);
} else {
mNotificationData.updateRanking(rankingMap);
}
return;
}
if (isUpdate) {
updateNotification(sbn, rankingMap);
} else {
addNotification(sbn, rankingMap, null /* oldEntry */);
}
}
});
}
}
@Override
public void onNotificationRemoved(StatusBarNotification sbn,
final RankingMap rankingMap) {
/// M: Enable this log for unusual case debug.
/*if (DEBUG)*/ Log.d(TAG, "onNotificationRemoved: " + sbn);
if (sbn != null) {
final String key = sbn.getKey();
mHandler.post(new Runnable() {
@Override
public void run() {
removeNotification(key, rankingMap);
}
});
}
}
@Override
public void onNotificationRankingUpdate(final RankingMap rankingMap) {
if (DEBUG) Log.d(TAG, "onRankingUpdate");
if (rankingMap != null) {
mHandler.post(new Runnable() {
@Override
public void run() {
updateNotificationRanking(rankingMap);
}
});
} }
};
```
本质上：NotificationListenerService extends Service 此为远程服务
通过绑定此服务在底层对notification进行删除和添加，然后回调上面的方法,当一个新的通知产生后则先调用onNotificationPosted()
然后调用BaseStatusBar 的addNotification()，而addNotification()由其子类PhoneStatusBar 实现：
- addNotification() 代码如下;
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public void addNotification(StatusBarNotification notification, RankingMap ranking, Entry oldEntry) { if (DEBUG) Log.d(TAG, "addNotification key=" + notification.getKey()); /// M: [ALPS02738355] fix foreground service flag_hide_notification issue. @{ if (notification != null && notification.getNotification() != null && (notification.getNotification().flags & Notification.FLAG_HIDE_NOTIFICATION) != 0) { Log.d(TAG, "Will not add the notification.flags contains FLAG_HIDE_NOTIFICATION"); return; } /// @} mNotificationData.updateRanking(ranking); Entry shadeEntry = createNotificationViews(notification); if (shadeEntry == null) { return; } boolean isHeadsUped = shouldPeek(shadeEntry); if (isHeadsUped) { mHeadsUpManager.showNotification(shadeEntry); // Mark as seen immediately setNotificationShown(notification); } if (!isHeadsUped && notification.getNotification().fullScreenIntent != null) { if (shouldSuppressFullScreenIntent(notification.getKey())) { if (DEBUG) { Log.d(TAG, "No Fullscreen intent: suppressed by DND: " + notification.getKey()); } } else if (mNotificationData.getImportance(notification.getKey()) < NotificationListenerService.Ranking.IMPORTANCE_MAX) { if (DEBUG) { Log.d(TAG, "No Fullscreen intent: not important enough: " - notification.getKey()); } } else { // Stop screensaver if the notification has a full-screen intent. // (like an incoming phone call) awakenDreams(); // not immersive & a full-screen alert should be shown if (DEBUG) Log.d(TAG, "Notification has fullScreenIntent; sending fullScreenIntent"); try { EventLog.writeEvent(EventLogTags.SYSUI_FULLSCREEN_NOTIFICATION, notification.getKey()); notification.getNotification().fullScreenIntent.send(); shadeEntry.notifyFullScreenIntentLaunched(); MetricsLogger.count(mContext, "note_fullscreen", 1); } catch (PendingIntent.CanceledException e) { } } } //cuizehui if(notification.getKey().equalsIgnoreCase("0|com.android.systemui|2131886133|null|10033")) { android.util.Log.d("czh","not allow "+notification.getKey()); } else{ android.util.Log.d("czh","equels allow"+notification.getKey()); } // addNotificationViews(shadeEntry, ranking); // Recalculate the position of the sliding windows and the titles. setAreThereNotifications(); }
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调用 addNotificationViews(); //添加条目.此方法在BaseStatusBar 中实现：
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protected void addNotificationViews(Entry entry, RankingMap ranking) { if (entry == null) { return; } android.util.Log.d("czh","add_notificationview"); // Add the expanded view and icon. mNotificationData.add(entry, ranking); updateNotifications(); }
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调用子类PhoneStatusBar:
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protected void updateNotifications() { mNotificationData.filterAndSort(); updateNotificationShade(); mIconController.updateNotificationIcons(mNotificationData); }
- updateNotificationShade()：
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private void updateNotificationShade() { if (mStackScroller == null) return; // Do not modify the notifications during collapse. if (isCollapsing()) { addPostCollapseAction(new Runnable() { @Override public void run() { updateNotificationShade(); } }); return; } ArrayList<Entry> activeNotifications = mNotificationData.getActiveNotifications(); ArrayList<ExpandableNotificationRow> toShow = new ArrayList<>(activeNotifications.size()); final int N = activeNotifications.size(); for (int i=0; i<N; i++) { Entry ent = activeNotifications.get(i); int vis = ent.notification.getNotification().visibility; // Display public version of the notification if we need to redact. final boolean hideSensitive = !userAllowsPrivateNotificationsInPublic(ent.notification.getUserId()); boolean sensitiveNote = vis == Notification.VISIBILITY_PRIVATE; boolean sensitivePackage = packageHasVisibilityOverride(ent.notification.getKey()); boolean sensitive = (sensitiveNote && hideSensitive) || sensitivePackage; boolean showingPublic = sensitive && isLockscreenPublicMode(); if (showingPublic) { updatePublicContentView(ent, ent.notification); } ent.row.setSensitive(sensitive, hideSensitive); if (ent.autoRedacted && ent.legacy) { // TODO: Also fade this? Or, maybe easier (and better), provide a dark redacted form // for legacy auto redacted notifications. if (showingPublic) { ent.row.setShowingLegacyBackground(false); } else { ent.row.setShowingLegacyBackground(true); } } if (mGroupManager.isChildInGroupWithSummary(ent.row.getStatusBarNotification())) { ExpandableNotificationRow summary = mGroupManager.getGroupSummary( ent.row.getStatusBarNotification()); List<ExpandableNotificationRow> orderedChildren = mTmpChildOrderMap.get(summary); if (orderedChildren == null) { orderedChildren = new ArrayList<>(); mTmpChildOrderMap.put(summary, orderedChildren); } orderedChildren.add(ent.row); } else { toShow.add(ent.row); } }
至此一个notification 则展示完全 ,可以发现最终显示在锁屏界面的通知栏是 ：ExpandableNotificationRow
应用
可以分析当我们需要，拦截掉某些notification 不让其显示则可以在源头：onNotificationPosted 进行包名的过滤和拦截 也可以在 addNotification() 限制其view 的添加和显示 addNotificationViews()不让其调用此方法
待分析
源头 ：NotificationListenerService
删除一条notification的操作：
- public void removeNotification(String key, RankingMap ranking);
- updateRowStates->addNotification(); : show Row