Java 无法解析方法addNotification（）

我替换了此选项（它仅允许我在应用程序打开时显示通知）：

使用此功能（它允许我在应用程序关闭时显示通知：

public class PushNotificationReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        //at this point the context has the permission to create remote views
        addNotification(context);
        setResultCode(Activity.RESULT_OK);
    }

    private void addNotification(Context context) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            NotificationChannel channel =
                    new NotificationChannel("MyNotifications", "MyNotifications", NotificationManager.IMPORTANCE_DEFAULT);
            NotificationManager manager = getSystemService(NotificationManager.class);
            manager.createNotificationChannel(channel);
        }
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, "MyNotifications")
                .setContentTitle("Chiamata in arrivo")
                .setSmallIcon(R.mipmap.ic_launcher)
                .setAutoCancel(true)
                .setContentText("Apri FtoF per partecipare alla videochiamata");
        NotificationManagerCompat manager = NotificationManagerCompat.from(context);
        manager.notify(999, builder.build());
    }

}

但现在在第283行出现此错误：无法解析方法“addNotification（）” 有人知道为什么吗？ 完整代码： 第（111-136）行（283） 多谢各位

public class PushNotificationReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        //at this point the context has the permission to create remote views
        addNotification(context);
        setResultCode(Activity.RESULT_OK);
    }

    private void addNotification(Context context) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
            NotificationChannel channel =
                    new NotificationChannel("MyNotifications", "MyNotifications", NotificationManager.IMPORTANCE_DEFAULT);
            NotificationManager manager = getSystemService(NotificationManager.class);
            manager.createNotificationChannel(channel);
        }
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, "MyNotifications")
                .setContentTitle("Chiamata in arrivo")
                .setSmallIcon(R.mipmap.ic_launcher)
                .setAutoCancel(true)
                .setContentText("Apri FtoF per partecipare alla videochiamata");
        NotificationManagerCompat manager = NotificationManagerCompat.from(context);
        manager.notify(999, builder.build());
    }

}