安卓交付所需的FcmNotification属性？

import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;

public class MyFirebaseMessagingService extends FirebaseMessagingService {
    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        if (remoteMessage.getData().size() > 0) {
            // 处理数据消息
        }

        if (remoteMessage.getNotification() != null) {
            FcmNotification notification = remoteMessage.getNotification();
            String title = notification.getTitle();
            String body = notification.getBody();

            // 构建通知
            NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "channel_id")
                    .setSmallIcon(R.drawable.ic_notification)
                    .setContentTitle(title)
                    .setContentText(body)
                    .setPriority(NotificationCompat.PRIORITY_HIGH)
                    .setAutoCancel(true);

            // 显示通知
            NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
            notificationManager.notify(0, builder.build());
        }
    }
}