android 8.1 Not allowed to start service Intent

之前：

Intent intent = new Intent();
intent.setComponent(new ComponentName("com.mile.projectorctrl", "com.mile.projectorctrl.OffScreenPowerService"));
startService(intent);

但是报错，Not allowed to start service Intent

查了百度，说要改成

context.startForegroundService(intent);

服务内的oncreate内部添加：

@Override
public void onCreate() {
    super.onCreate();
    startForeground(1349, new Notification());
}

当然，不添加可以不可以，我还么时间试验

得这样改：

        //适配8.0service
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        NotificationChannel mChannel = null;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mChannel = new NotificationChannel(CHANNEL_ID_STRING, "投影仪将关闭", NotificationManager.IMPORTANCE_HIGH);
            notificationManager.createNotificationChannel(mChannel);
            Notification notification = new Notification.Builder(getApplicationContext(), CHANNEL_ID_STRING).build();
            startForeground(1349, notification);
        }

参考：

https://blog.csdn.net/kongbaidepao/article/details/80259150

https://blog.csdn.net/o279642707/article/details/82352431