有的手機在添加channel后仍然無法彈出通知。追蹤logcat發現有這么一句：

E/NotificationService: Suppressing notification from package by user request.

用戶請求抑制此通知？追蹤notify源碼找到NotificationManagerService的enqueueNotificationInternal(......)方法：

void enqueueNotificationInternal(final String pkg, final String opPkg, final int callingUid,final int callingPid, final String tag, final int id, final Notification notification,int incomingUserId) {

...

if (!checkDisqualifyingFeatures(userId, notificationUid, id, tag, r)) {return;}

...

mHandler.post(new EnqueueNotificationRunnable(userId, r));

}

private boolean checkDisqualifyingFeatures(int userId, int callingUid, int id, String tag,NotificationRecord r) {

...// blocked apps

if (isBlocked(r, mUsageStats)) {return false;}

return true;

}

protected boolean isBlocked(NotificationRecord r, NotificationUsageStats usageStats) {

final String pkg = r.sbn.getPackageName();

final int callingUid = r.sbn.getUid();

final boolean isPackageSuspended = isPackageSuspendedForUser(pkg, callingUid);

if (isPackageSuspended) {

Slog.e(TAG, "Suppressing notification from package due to package suspended by administrator.");

usageStats.registerSuspendedByAdmin(r);

return isPackageSuspended;

}

final boolean isBlocked = mRankingHelper.getImportance(pkg, callingUid) == NotificationManager.IMPORTANCE_NONE

|| r.getChannel().getImportance() == NotificationManager.IMPORTANCE_NONE;

if (isBlocked) {

Slog.e(TAG, "Suppressing notification from package by user request.");

usageStats.registerBlocked(r);

}

return isBlocked;

}

最終的isBlocked判斷條件滿足，導致notify操作被中斷return。

總結

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