Android:分组通知和摘要在 4.4 及以下版本仍单独显示

Question

我想实现 stacked notifications on Android Wear 为此，我为每个“项目”创建 1 个摘要通知和 N 个单独的通知。我只想在手机上显示摘要。这是我的代码:

private void showNotifications() {
    NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
    showNotification1(notificationManager);
    showNotification2(notificationManager);
    showGroupSummaryNotification(notificationManager);
}

private void showNotification1(NotificationManager notificationManager) {
    showSingleNotification(notificationManager, "title 1", "message 1", 1);
}

private void showNotification2(NotificationManager notificationManager) {
    showSingleNotification(notificationManager, "title 2", "message 2", 2);
}

protected void showSingleNotification(NotificationManager notificationManager,
                                      String title,
                                      String message,
                                      int notificationId) {
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
    builder.setContentTitle(title)
            .setContentText(message)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setGroupSummary(false)
            .setGroup("group");
    Notification notification = builder.build();
    notificationManager.notify(notificationId, notification);
}

private void showGroupSummaryNotification(NotificationManager notificationManager) {
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
    builder.setContentTitle("Dummy content title")
            .setContentText("Dummy content text")
            .setStyle(new NotificationCompat.InboxStyle()
                    .addLine("Line 1")
                    .addLine("Line 2")
                    .setSummaryText("Inbox summary text")
                    .setBigContentTitle("Big content title"))
            .setNumber(2)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setCategory(Notification.CATEGORY_EVENT)
            .setGroupSummary(true)
            .setGroup("group");
    Notification notification = builder.build();
    notificationManager.notify(123456, notification);
}

这在 Android 5.1 上运行良好，只有摘要显示在手机的通知栏中:

但在 Android 4.4 上，它还显示单独的通知 1 和 2:

在这两种情况下，Android Wear 上的通知都会根据需要显示在堆栈中。如何让 Android 4.4 只在通知栏中显示摘要通知？

Answer 1

通过使用解决了这个问题

NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);

而不是

NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);

并在相应的方法签名中将 NotificationManager 替换为 NotificationManagerCompat。