Android11中，systemUI中，被合并的Notification，是如何展开的，麻烦提供一下源码

在Android 11中，合并的通知在StatusBarNotification中的`isGroup()`方法中被判断。如果返回true，则表示该通知属于一组合并的通知。在展开通知栏时，系统会调用`NotificationGroupManager`类中的`onGroupExpand`方法，该方法中会将该组中的所有通知都展开。

以下是部分源码：

StatusBarNotification.java：

public boolean isGroup() {
    return getNotification().isGroupSummary();
}

NotificationGroupManager.java：

public void onGroupExpand(NotificationEntry entry, boolean animateChildren) {
    ...
    if (entry.row.isSummaryWithChildren()) {
        boolean wasExpanded = entry.row.isGroupExpanded();
        entry.row.setExpandAnimationRunning(animateChildren);
        entry.row.setChildrenExpanded(true, animateChildren);
        entry.row.setExpandAnimationRunning(false);

        // Notify that we've expanded a group
        mHeadsUpManager.onGroupExpanded(entry.row.getStatusBarNotification());

        if (wasExpanded && !animateChildren) {
            // No need to update the children if they are already visible and
            // we aren't animating the expand gesture
            return;
        }
        NotificationChildrenContainer childrenContainer = entry.row.getChildrenContainer();
        ArrayList<ExpandableNotificationRow> notificationChildren =
                childrenContainer.getNotificationChildren();
        for (int i = 0; i < notificationChildren.size(); i++) {
            ExpandableNotificationRow child = notificationChildren.get(i);
            child.inflateViews();
            mGroupExpansionManager.updateNotificationViews(child.getRow());
        }
    }
    ...
}

你可以在Android源码中的`frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/`中找到相关的源码。