Bad notification for startForeground: java.lang.RuntimeException: invalid channel for service

Android 8.0 通过startService开启服务引起crash问题
解决方法：

   Intent intent = new Intent(this, ForegroundService.class);
   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            startForegroundService(intent);
   } else {
            startService(intent);
   }

/**
 * @author：jhonjson
 * @date：2019/9/28 17:56 AM
 * @describe：前台进程 作用保活
 */
public class ForegroundService extends Service {
    private static final String TAG = ForegroundService.class.getSimpleName();
    private NotificationManager notificationManager;
    private String notificationId = "channel_Id";
    private String notificationName = "channel_Name";

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d(TAG, "onCreate()");
        notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        //创建NotificationChannel
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(notificationId, notificationName, NotificationManager.IMPORTANCE_HIGH);
            notificationManager.createNotificationChannel(channel);
        }

        startForeground(1, getNotification());
    }

    private Notification getNotification() {
        Notification.Builder builder = new Notification.Builder(this)
                .setSmallIcon(R.mipmap.ic_launcher_de)
                .setContentTitle("视频交友")
                .setContentText("");

        //设置Notification的ChannelID,否则不能正常显示

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            builder.setChannelId(notificationId);
        }
        Notification notification = builder.build();
        return notification;

    }


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d(TAG, "onStartCommand()");
        return super.onStartCommand(intent, flags, startId);

    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.d(TAG, "onDestroy()");
    }

    @Override
    public boolean onUnbind(Intent intent) {
        Log.d(TAG, "onUnbind()");
        return super.onUnbind(intent);
    }


    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        Log.d(TAG, "onBind()");
        return null;
    }
}