Oreo - Foreground service does not show foreground notification

问题

So far, I've adjsuted my code to use ContextCompat.startForegroundService(context, intentService); to start my service. This way, it works on android < 26 and on android 26 (Oreo) as well.

I still see a difference, in android oreo I don't see my custom foreground notification (I only see the "app is running in the background" notification). Do I have to adjust anything there as well?

My service looks like this:

public class BaseOverlayService extends Service {
    @Override
    public void onCreate() {
        super.onCreate();
        moveToForeground();
    }

    private void moveToForeground() {
        Notification notification = ...;
        super.startForeground(NOTIFICATION_ID, notification);
    }
}

Official example

This example (https://github.com/googlesamples/android-play-location/blob/master/LocationUpdatesForegroundService/app/src/main/java/com/google/android/gms/location/sample/locationupdatesforegroundservice/LocationUpdatesService.java#L200) shows as comment, that I should use following, but startServiceInForeground does not exist...

if (Build.VERSION.SDK_INT == Build.VERSION_CODES.O) {
    NotificationManager mNotificationManager = ((NotificationManager) getSystemService(NOTIFICATION_SERVICE));
    mNotificationManager.startServiceInForeground(new Intent(this, BaseOverlayService.class), NOTIFICATION_ID, notification);
} else {
    startForeground(NOTIFICATION_ID, notification);
}

Edit

My notification is created like this, which is working on thousands of android devices with API < 26 until now:

protected Notification foregroundNotification(int notificationId)
{
    boolean paused = MainApp.getPrefs().sidebarServicePaused();
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
    builder.setSmallIcon(R.drawable.icon_not);
    builder.setContentIntent(notificationIntent());
    builder.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.icon));
    builder.setContentTitle(getString(R.string.derived_app_name));
    builder.setContentText(getString(checkStatus() ? (paused ? R.string.service_notification_text_paused : R.string.service_notification_text_running) : R.string.service_notification_text_preparing));
    builder.setColor(Color.parseColor("#25baa2"));

    if (MainApp.getPrefs().hideNotificationIcon())
        builder.setPriority(NotificationCompat.PRIORITY_MIN);
    else
        builder.setPriority(NotificationCompat.PRIORITY_MAX);

    if (paused)
        builder.addAction(R.drawable.ic_play_arrow_black_24dp, getString(R.string.resume), resumeIntent(this));
    else
        builder.addAction(R.drawable.ic_pause_black_24dp, getString(R.string.pause), pauseIntent(this));

    return builder.build();
}

回答1:

You may need to define Notification Channel for your app. Check the log, there should be warning. Check this for introduction

I'll give you some example, it would be in kotin. First, make a class like this. You'll need to call createMainNotificationChannel() once at the start of your application.

class NotificationManager(private val context: Context) {

    companion object {
        private val CHANNEL_ID = "YOUR_CHANNEL_ID"
        private val CHANNEL_NAME = "Your human readable notification channel name"
        private val CHANNEL_DESCRIPTION = "description"
    }

    @RequiresApi(Build.VERSION_CODES.O)
    fun getMainNotificationId(): String {
        return CHANNEL_ID
    }

    @RequiresApi(Build.VERSION_CODES.O)
    fun createMainNotificationChannel() {
            val id = CHANNEL_ID
            val name = CHANNEL_NAME
            val description = CHANNEL_DESCRIPTION
            val importance = android.app.NotificationManager.IMPORTANCE_LOW
            val mChannel = NotificationChannel(id, name, importance)
            mChannel.description = description
            mChannel.enableLights(true)
            mChannel.lightColor = Color.RED
            mChannel.enableVibration(true)
            val mNotificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as android.app.NotificationManager
            mNotificationManager.createNotificationChannel(mChannel)
    }
}

Then you can use util like this

fun createNotificationCompatBuilder(context: Context): NotificationCompat.Builder {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        return NotificationCompat.Builder(context, NotificationManager(context).mainNotificationId)
    } else {
        return NotificationCompat.Builder(context)
    }
}

回答2:

Code in kotlin

 private fun customNotification(title: String,notificationID: Int) {

                val intent = Intent(this, MainActivity::class.java)
                val pendingIntent = PendingIntent.getActivity(this, 0 /* request code */, intent, PendingIntent.FLAG_UPDATE_CURRENT)


                val builder = NotificationCompat.Builder(this, title)
                .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
                .setContentText("Notification description")
                        .setSmallIcon(R.drawable.ic_mark_map)
                        .setContentIntent(pendingIntent)
                        .setOnlyAlertOnce(true)

                val mNotificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager

                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                    val channel = NotificationChannel(title,
                            "Channel human readable title",
                            NotificationManager.IMPORTANCE_DEFAULT)
                    mNotificationManager.createNotificationChannel(channel)
                }

                 val notification = builder.build()
                 startForeground(notificationID, notification)
            }

Use:

 customNotification("Title",101)

回答3:

  // Since android Oreo notification channel is needed.
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                NotificationChannel channel = new NotificationChannel(channelId,
                        getString(R.string.app_name),
                        NotificationManager.IMPORTANCE_HIGH);

                AudioAttributes attributes = new AudioAttributes.Builder()
                        .setUsage(AudioAttributes.USAGE_NOTIFICATION)
                        .build();


                channel.setDescription(data.get("body"));
                channel.enableLights(true);
                channel.enableVibration(true);
                channel.setSound(SoundUri, attributes); // This is IMPORTANT

                notificationManager.createNotificationChannel(channel);


            }

来源：https://stackoverflow.com/questions/46111860/oreo-foreground-service-does-not-show-foreground-notification