Notification.Builder中的setGroup()的用途是什么?

问题描述

我在理解 setGroup() 方法.

I have a some troubles with understanding of goal of setGroup() method.

如文档所述:

这是第一个问题:

我创建了一种显示自定义短信的方法:

I create a method which show a custom text message :

    public static void showNotification(Context context, String title, String message, PendingIntent pendingIntent) {
        notificationMessages.add(message);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
                .setContentTitle(title)
                .setContentText(message)
                .setAutoCancel(true)
//                .setGroupSummary(true)
                .setSmallIcon(R.drawable.ic_launcher)
                .setContentInfo("" + (notificationMessages.size()))
                /*.setGroup(++i + "")*/;

        NotificationCompat.InboxStyle inboxStyle = new NotificationCompat.InboxStyle();

        inboxStyle.setBigContentTitle(title);
        for (int i = 0; i < notificationMessages.size(); i++) {
            inboxStyle.addLine(notificationMessages.get(i));
        }

        builder.setContentIntent(pendingIntent);
        builder.setStyle(inboxStyle);

        NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = builder.build();
        mNotificationManager.notify(0, notification);
    }

并使用notificationID，setGroup和setGroupSummary方法播放.

    public static void showNotification(Context context, String title, String message, PendingIntent pendingIntent) {
        notificationMessages.add(message);

        NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
                .setContentTitle(title)
                .setContentText(message)
                .setAutoCancel(true)
//                .setGroupSummary(true)
                .setSmallIcon(R.drawable.ic_launcher)
                .setContentInfo("" + (notificationMessages.size()))
                .setGroup(GROUP_KEY);

        NotificationCompat.InboxStyle inboxStyle = new NotificationCompat.InboxStyle();

        inboxStyle.setBigContentTitle(title);
        for (int i = 0; i < notificationMessages.size(); i++) {
            inboxStyle.addLine(notificationMessages.get(i));
        }

        builder.setContentIntent(pendingIntent);
        builder.setStyle(inboxStyle);

        NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = builder.build();
        mNotificationManager.notify(new Random().nextInt(3), notification);
    }

但是，没有视觉变化不管我是否发表评论.因此，对我来说，了解这种方法的目的是很困难的.

But, no visual changescomes if I commented lines or not. So here is a stuck for me in understanding of purpose of this method.

推荐答案

来自官方文档:

http://developer.android.com/preview/features/notification -updates.html

意味着setGroup仅在设备支持的情况下才会有所不同.

Meaning the setGroup will only make a difference if the device supports it.

支持该功能的设备为:

• Android Wear设备.显示远程通知时，您可以将它们分组在一起
• AndroidN.运行Android N开发人员预览版的设备(或将来的正式N版本)将一起显示一组通知

以下博客文章显示了它们如何在Android N上工作: https://medium.com/exploring-android/android-n-introducing-upgraded-notifications-d4dd98a7ca92

The following blog post shows how those work on Android N: https://medium.com/exploring-android/android-n-introducing-upgraded-notifications-d4dd98a7ca92

bellow是一组外观的渲染:

bellow is a render of that a group looks like:

这意味着setGroup对于运行以下API23的设备(包括棉花糖，棒棒糖，奇巧等)不会产生任何影响.

That means that setGroup will make no difference on devices running anything bellow API23, that includes, Marshamallow, Lollipop, KitKat, etc.

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