前台服务在Oreo中无法运行。

Question

我有一个在我的手机(Android 7.0)上运行的前台服务，但它在朋友的手机(Android 8.0)上无法运行。我在Android Studio模拟器上测试过，发现在8.0版本中也存在同样的问题。为了解决这个问题，我实现了if-else检查，看是否是Android 8.0版本，以便调用startForegroundService()，但仍然没有解决问题。

这是我的调用方式：

 //Start foreground service
    Intent intent = new Intent(this, MyForeGroundService.class);
    intent.setAction(MyForeGroundService.ACTION_START_FOREGROUND_SERVICE);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        startForegroundService(intent);
    }else{
        startService(intent);
    }

这里是我的前台服务：

public class MyForeGroundService extends Service implements LocationListener {

public MyForeGroundService() {
}

@Override
public IBinder onBind(Intent intent) {
    // TODO: Return the communication channel to the service.
    throw new UnsupportedOperationException("Not yet implemented");
}

@Override
public void onCreate() {
    super.onCreate();
    wakeLock();
}

@SuppressLint("InvalidWakeLockTag")
public void wakeLock() {
    pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
    assert pm != null;
    wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "partialwl");
    wl.acquire();
}

public  void stopWakeLock() {
    wl.release();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    if (intent != null) {
        String action = intent.getAction();

        switch (action) {
            case ACTION_START_FOREGROUND_SERVICE:
                wakeLock();
                startForegroundService();
                break;
            case ACTION_STOP_FOREGROUND_SERVICE:
                stopWakeLock();
                stopForegroundService();
                break;
            case ACTION_PLAY:
                Intent openMap= new Intent(this,Map.class);
                startActivity(openMap);
                break;
            case ACTION_PAUSE:
                break;
        }
    }
    return START_STICKY;
}

/* Used to build and start foreground service. */
private void startForegroundService() {
    Log.d(TAG_FOREGROUND_SERVICE, "Start foreground service.");

    // Create notification default intent.
    Intent intent = new Intent(this,Map.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

    // Create notification builder.
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this);

    //Go back to Map activity if user press at the notification
    builder.setContentIntent(pendingIntent)
            .setContentTitle("gEKOning...")
            .setContentText("Tap to open gEKOn app");


    builder.setWhen(System.currentTimeMillis());
    builder.setSmallIcon(R.mipmap.ic_launcher);
    Bitmap largeIconBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);
    builder.setLargeIcon(largeIconBitmap);
    // Make the notification max priority.
    builder.setPriority(Notification.PRIORITY_MAX);
    // Make head-up notification.
    builder.setFullScreenIntent(pendingIntent, true);


    // Build the notification.
    Notification notification = builder.build();

    // Start foreground service.
    startForeground(1, notification);
}
private void stopForegroundService() {
    Log.d(TAG_FOREGROUND_SERVICE, "Stop foreground service.");

    // Stop foreground service and remove the notification.
    stopForeground(true);

    // Stop the foreground service.
    stopSelf();
}

- Alex

---

这个答案应该会帮到你：https://stackoverflow.com/a/53081689/4255978 - HedeH

没关系，这只是为了让Android管理通知。如果您想了解更多信息，可以阅读有关通知渠道的内容：https://developer.android.com/training/notify-user/channels - HedeH

它打开设置，因为您没有指定“PendingIntent”、“title”等。所以系统正在为您创建通知。您需要向“Notification.Builder”添加内容。请参阅此处：https://developer.android.com/training/notify-user/build-notification - HedeH

@HedeH 非常感谢你！ - Alex

它实际上正在运行。你只需要创建一个通知渠道。 - Rohit Singh

Answer 1

你需要定义一个通知渠道。像这样就可以了：

需要定义一个通知渠道，类似以下代码：

private void createNotificationChannel() {
// Create the NotificationChannel, but only on API 26+ because
// the NotificationChannel class is new and not in the support library
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    CharSequence name = getString(R.string.channel_name);
    String description = getString(R.string.channel_description);
    int importance = NotificationManager.IMPORTANCE_DEFAULT;
    NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
    channel.setDescription(description);
    // Register the channel with the system; you can't change the importance
    // or other notification behaviors after this
    NotificationManager notificationManager = getSystemService(NotificationManager.class);
    notificationManager.createNotificationChannel(channel);
}}

- Krishan Liyanaarachchi

---

有些人，包括我在内，会在模拟器中测试通知时出现FCM无法工作的困惑。我是在Nexus 5虚拟设备上进行测试的，没有意识到它正在运行Android O系统。做得好。 - Rohit Singh