android - 应用内通知

Question

当应用程序启动时，它会从数据库中检索数据。如果有新数据，我希望应用程序显示应用内通知(横幅)以警告用户。

目前我实现了这个:

if (!taskToNotify.isEmpty()) {
            //Notification builder
            NotificationCompat.Builder builder = new NotificationCompat.Builder(mContext);
            builder.setAutoCancel(true);
            builder.setSmallIcon(R.drawable.ic_event_notification);
            builder.setContentTitle(taskToNotify.get(0).getName() + mContext.getString(R.string.notification_content_task));
            builder.setDefaults(Notification.DEFAULT_VIBRATE | Notification.DEFAULT_SOUND);

            // inbox style
            NotificationCompat.InboxStyle inboxStyle = new NotificationCompat.InboxStyle();
            inboxStyle.addLine(mContext.getString(R.string.notification_detail_date) + taskToNotify.get(0).dueDateToString());
            inboxStyle.addLine(mContext.getString(R.string.notification_detail_location) + taskToNotify.get(0).getLocationName());

            // Moves the expanded layout object into the notification object.
            builder.setStyle(inboxStyle);


            mAdapter.notifyDataSetChanged();

            builder.build();
        }

但这暂时不起作用。代码运行时不显示任何通知。

是否有可能在 Android 手机上执行此操作？或者我应该以另一种方式向用户显示此信息？

感谢您宝贵的帮助:)

Answer 1

你缺少setContentText()否则不满足要求。

When creating a notification, specify the UI content and actions with a NotificationCompat.Builder object. At bare minimum, a Builder object must include the following:

• 一个小图标，由 setSmallIcon() 设置
• 标题，由 setContentTitle() 设置
• 详细文本，由setContentText()设置

https://developer.android.com/training/notify-user/build-notification.html