systemui shield notification bar

背景描述

The client said to block notifications in an app,But not all of them are blocked,Only block some notifications for the specified app.
很奇怪,This thing needs to be done by the system,Wouldn't it be nice if the app didn't send notifications？
但是没办法,甲方爸爸的需求,唉（：

需求实现

方案1 ------ systemuiBlock notifications

vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/statusbar/notification/NotificationFilter.java的shouldFilterOutAdd filtering to the method

	/** * "packageName/channelId" * 表示 This is the package namechannelIDnotifications can be displayed,All others are blocked,Judgment logic see{@link notificationHide} * */
    private static void initNotificationFilterList(){
    
        notificationFilterList.add("com.aaa.bbb/background_download");
        notificationFilterList.add("com.aaaa.ccc/background__upgrade");
    }
	/** * @return true/false When marking, specify whether hiding is required at the same time * @param key 指定应用的包名 * @param channelId Displays the specified notification,All other notifications are filtered * */
    public static boolean notificationHide(String key,String channelId){
    
        if (notificationFilterList.size() == 0){
    
            initNotificationFilterList();
        }
        if (key != null && key.length() > 0 && channelId != null && channelId.length() > 0){
    
            for (int i=0;i < notificationFilterList.size();i++){
    
                String index = notificationFilterList.get(i);
                String packageName ;
                String cId ;
                if (index != null && index.length() > 0){
    
                    String[] dex = index.split("/");
                    if (dex !=null && dex.length == 2){
    
                        packageName = dex[0];
                        cId = dex[1];
                        if (key.contains(packageName)
                                && !channelId.equals(cId)) {
    
                            return true;
                        }
                    }
                }

            }
        }
        return false;
    }
	/** * @return true if the provided notification should NOT be shown right now. */
    public boolean shouldFilterOut(NotificationEntry entry) {
    
        final StatusBarNotification sbn = entry.getSbn();
        ...
		if (sbn != null){
    
            if (notificationHide(sbn.getKey(),sbn.getNotification().getChannelId())){
    
            	//Block app notifications
                return true;
            }
        }
		...
        return false;
    }

vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/statusbar/NotificationListener.java的onNotificationPosted中

@Override
    public void onNotificationPosted(final StatusBarNotification sbn,
            final RankingMap rankingMap) {
    
        if (DEBUG) Log.d(TAG, "onNotificationPosted: " + sbn);
        if (sbn != null){
    
            //Block app notifications
            if (NotificationFilter.notificationHide(sbn.getKey(),sbn.getNotification().getChannelId())){
    
                return ;
            }
        }
        if (sbn != null && !onPluginNotificationPosted(sbn, rankingMap)) {
    
            mMainHandler.post(() -> {
    
                processForRemoteInput(sbn.getNotification(), mContext);

                for (NotificationHandler handler : mNotificationHandlers) {
    
                    handler.onNotificationPosted(sbn, rankingMap);
                }
            });
        }
    }

The above method can be blockedsystemuiNotice below,Implement the specified application to display only the specified notification,All other notifications are required to be hidden.
but
This effect just doesn't show the notification,The notification itself is still there.
1、比如launcher's notification dot,Problems such as the notification display of long-pressing the desktop icon.
frameworks/base/core/java/android/service/notification/NotificationListenerService.java
的getActiveNotifications方法获取通知.
2、其它应用可以通过
frameworks/base/services/core/java/com/android/server/notification/NotificationManagerService.java的getNotificationRecord、getActiveNotificationsFromListenerOr other methods to get the notification content.
Re-trigger another way of thinking
We should fundamentally remove those notifications to block,Or just leave it out in the first placeadd到NotificationManagerService中去.

方案2 ------ framework中屏蔽

frameworks/base/services/core/java/com/android/server/notification/NotificationManagerService.java中
The acquisition of notifications is mainly in

@GuardedBy("mNotificationLock")
final ArrayList<NotificationRecord> mNotificationList = new ArrayList<>();
@GuardedBy("mNotificationLock")
final ArrayMap<String, NotificationRecord> mNotificationsByKey = new ArrayMap<>();

The two lists summap中存储.We want to implement blocking add,Implements blocking of specific notifications.
1、track above2个add和put数据的地方
2、PostNotificationRunnable的run方法中进行add和put通知数据
3、EnqueueNotificationRunnable中启动的PostNotificationRunnable
4、enqueueNotificationInternal方法中启动EnqueueNotificationRunnable,But later found that there are other places also enabledEnqueueNotificationRunnable.
所以我们在enqueueNotificationInternal和EnqueueNotificationRunnable 2Every place has added some shielding processing.

void enqueueNotificationInternal(...){
    
	...
	if (notificationHide(pkg,channelId)){
    //过滤通知
    	return;
	}
	if (channel == null) {
    
    	final String noChannelStr = "No Channel found for "
	}
	...
}

内部类EnqueueNotificationRunnable的run方法中

public void run() {
    
	...
	if (contextId != null) {
    
		(new SnoozeNotificationRunnable(r.getSbn().getKey(),
				0, contextId)).snoozeLocked(r);
		return;
	}
	//Block notifications
	if(r != null && r.getSbn() !=null && r.getSbn().getNotification() !=null){
    
		String key = r.getSbn().getKey();
		String channelId = r.getSbn().getNotification().getChannelId();
		if (notificationHide(key,channelId)){
    
			return;
		}
	}
	mEnqueuedNotifications.add(r);
	...
}

这样修改之后,can be completely blocked,Notifications are no longer added to the list.

结尾

The above process is onlynotificationA small part of the notification process
Full notification sent----framework添加通知----systemui显示通知.etc. The process is not fully tracked.
如果有理解不到位的地方,欢迎留言~

补充

通知的使用：https://blog.csdn.net/jppipai/article/details/122864465
1、App sends notifications------framework中serviceManage notification data
NotificationManager.notify------NotificationManagerService.enqueueNotificationWithTag------NotificationManagerService.enqueueNotificationInternal
这里就和上面serviceThe place to block notifications echoed.

//manageras an interface to the upper layer,It will eventually fallserviceManage notification data
frameworks/base/core/java/android/app/NotificationManager.java
    public void notify(int id, Notification notification)
    {
    
        notify(null, id, notification);
    }
    public void notify(String tag, int id, Notification notification)
    {
    
        notifyAsUser(tag, id, notification, mContext.getUser());
    }
    public void notifyAsUser(String tag, int id, Notification notification, UserHandle user)
    {
    
        INotificationManager service = getService();
        String pkg = mContext.getPackageName();

        try {
    
            if (localLOGV) Log.v(TAG, pkg + ": notify(" + id + ", " + notification + ")");
            service.enqueueNotificationWithTag(pkg, mContext.getOpPackageName(), tag, id,
                    fixNotification(notification), user.getIdentifier());
        } catch (RemoteException e) {
    
            throw e.rethrowFromSystemServer();
        }
    }
//serviceManage notification data
frameworks/base/services/core/java/com/android/server/notification/NotificationManagerService.java
@Override
public void enqueueNotificationWithTag(String pkg, String opPkg, String tag, int id,
        Notification notification, int userId) throws RemoteException {
    
    enqueueNotificationInternal(pkg, opPkg, Binder.getCallingUid(),
            Binder.getCallingPid(), tag, id, notification, userId);
}