通知不会出现在 Android 11 (sdk 30)

Question

通知工作正常，出现（sdk 28，android 9）。我决定在 android 11 的模拟器上试一试，结果没有出现通知。我无法理解我的错误。适用于任何地方，在 sdk 28 下的小米 Redmi 7 和 Pixel 4 上进行了测试。在 sdk 30 下的 Nexus 5 上，该应用程序可以正常工作，但只是没有通知。

private void createNotificationChannel(){
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            NotificationChannel channel1 = new
                    NotificationChannel(CHANNEL_ID_1, "Channel(1)", NotificationManager.IMPORTANCE_HIGH);
            channel1.setDescription("Channel 1 Dec..");

            NotificationChannel channel2 = new
                    NotificationChannel(CHANNEL_ID_2, "Channel(2)", NotificationManager.IMPORTANCE_HIGH);
            channel2.setDescription("Channel 2 Dec..");

            NotificationManager notificationManager = getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel1);
            notificationManager.createNotificationChannel(channel2);
        }
    }

void showNotification(int playPauseBtn){
        
        ...

        Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID_2)
                .setSmallIcon(playPauseBtn)
                .setLargeIcon(thumb)
                .setContentTitle(musicFiles.get(position).getTitle())
                .setContentText(musicFiles.get(position).getArtist())
                .addAction(R.drawable.ic_skip_previous, "Previous", prevPending)
                .addAction(playPauseBtn, "Pause", pausePending)
                .addAction(R.drawable.ic_skip_next, "Next", nextPending)
                .setStyle(new androidx.media.app.NotificationCompat.MediaStyle()
                        .setMediaSession(new MediaSessionCompat(getBaseContext(), TAG).getSessionToken()))
                .setPriority(NotificationCompat.PRIORITY_HIGH)
                .setContentIntent(contentPending)
                .setDeleteIntent(deletePending)
                .setOnlyAlertOnce(true)
                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
                .build();
        startForeground(2, notification);
    }

Answer 1

感谢您的回答，但错误原来是在另一个。这是风格 - .setStyle(new androidx.media.app.NotificationCompat.MediaStyle().setMediaSession(new MediaSessionCompat(getBaseContext(), TAG).getSessionToken()))

你不能这样做（它最多只能带你 11 个 android）！你需要这样做： .setStyle(new androidx.media.app.NotificationCompat.MediaStyle())

Answer 2

通知在 android 11 中显示，您可以进行相应的自定义。我已经测试了这段代码，并且在 android 11 模拟器中运行良好。

NotificationCompat.Builder notification = new NotificationCompat.Builder(this, CHANNEL_ID_2)
                .setSmallIcon(playPauseBtn)
                .setLargeIcon(thumb)
                .setContentTitle("Title")
                .setContentText("Text")
                .setStyle(new NotificationCompat.BigPictureStyle()
                        .bigPicture(imgUrl)
                        .bigLargeIcon(null))
                .setPriority(NotificationCompat.PRIORITY_HIGH)
                .setContentIntent(pendingIntent)
                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC);

        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            notification.setSmallIcon(playPauseBtn);
            notification.setColor(getResources().getColor(R.color.colorPrimary));
        } else {
            notification.setSmallIcon(playPauseBtn);
        }
        NotificationManagerCompat notificationManager = NotificationManagerCompat.from(getApplicationContext());

        int m = (int) ((new Date().getTime() / 1000L) % Integer.MAX_VALUE);
        notificationManager.notify(m,notification.build());