如何在 Android Oreo 及更高版本的通知托盘中显示带图片的通知？

Question

我想显示这样的通知（在 Android 7.0 API24 上）：

但我得到的结果只有托盘图标而不是全部内容。（Android 8.1.0 API27）：

代码：

Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

        String channelID="channelID";
        String channelName = "channelName";

        NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        NotificationCompat.Builder notificationBuilder;

        Intent notifyIntent = new Intent(this, MainActivity.class);

        notifyIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
                Intent.FLAG_ACTIVITY_SINGLE_TOP);

        PendingIntent notifyPendingIntent = PendingIntent.getActivity(this, 0, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT);
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
// Android 8.1.0 API27
            NotificationChannel notificationChannel = new NotificationChannel(channelID, channelName, notificationManager.IMPORTANCE_HIGH);
notificationManager.createNotificationChannel(notificationChannel);

            notificationBuilder = new NotificationCompat.Builder(getApplicationContext(), channelID);

            notificationBuilder
                    .setSmallIcon(R.drawable.ic_add_post)
                    .setContentTitle("some title")
                    .setContentText("some message")
                    .setAutoCancel(true)
                    .setSound(defaultSoundUri)
                    .setVibrate(new long[]{1000, 1000})
                    .setLights(Color.BLUE, 1,1)
                    .setShowWhen(true)
                    .setContentIntent(notifyPendingIntent);
            notificationManager.notify("do_not1",0 /* ID of notification */, notificationBuilder.build());
        } else {

            notificationBuilder = new NotificationCompat.Builder(getApplicationContext());

            notificationBuilder
                    .setSmallIcon(R.drawable.ic_add_post)
                    .setContentTitle("some title")
                    .setContentText("some message")
                    .setAutoCancel(true)
                    .setSound(defaultSoundUri)
                    .setVibrate(new long[]{1000, 1000})
                    .setLights(Color.BLUE, 1,1)
                    .setPriority(NotificationManager.IMPORTANCE_HIGH)
                    .setContentIntent(notifyPendingIntent);
            notificationManager.notify("do_not1",0 /* ID of notification */, notificationBuilder.build());
        }

我不知道为什么它在较低 api 下工作，但在较高 api 下它不起作用！

NotificationChannel 好像有问题，但找不到原因。

如何在over OREO api显示通知的全部内容如上图？

Answer 1

我在您的代码中没有发现任何可疑之处，但有可能 Android 删除了此功能（重要通知的先睹为快）- 对此一无所知 - 或自定义 OEM制作人重新设计了它 UI 认为这种先睹为快的做法是不受欢迎的

如何在 Android Oreo 及更高版本的通知托盘中显示带图片的通知？

How to show Android notification with picture in notification tray in Android Oreo and above?

notifications

android