Android Studio集成Azure+Google FCM遇阻：推送注册与服务调用异常

我在Android Studio中配置Azure通信服务，实现APP关闭状态下接收来电，但推送通知注册环节遇到问题。Azure官方教程未明确代码放置位置，我分别尝试将代码放在createAgent()函数和onCreate()函数末尾，虽然能成功获取设备注册token，但后续流程无进展。从日志输出来看，推送注册和来电推送处理的代码似乎在token获取完成前就已执行。

用到的代码片段 #

Firebase Token获取与推送注册代码

FirebaseMessaging.getInstance().getToken().addOnCompleteListener(new OnCompleteListener<String>() {
        @Override
        public void onComplete(@NonNull Task<String> task) {
            if (!task.isComplete()) {
                System.out.println("PushNotification getInstanceId failed");
                return;
            }
            deviceToken = task.getResult();
            System.out.println("PushNotification device registration token retrieved successfully");

            try {
                callAgent.registerPushNotification(deviceToken).get();
            }
            catch (Exception e) {
                System.out.println("Something went wrong while registering for Incoming Calls Push Notifications.");
            }

            try {
                PushNotificationInfo notification = PushNotificationInfo.fromMap(pushNotificationMessageDataFromFCM);

            }
            catch (Exception e) {
                System.out.println("Something went wrong while handling the Incoming Calls Push Notifications.");
            }
        }
    });

Firebase消息服务代码

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

public class MyFirebaseMessagingService extends FirebaseMessagingService {
    private java.util.Map<String, String> pushNotificationMessageDataFromFCM;

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        if (remoteMessage.getNotification() != null) {
            System.out.println("PushNotification");
        }
        else {
            pushNotificationMessageDataFromFCM = remoteMessage.getData();
        }
    }
}

当前问题细节 #

• 日志中已打印PushNotification device registration token retrieved successfully，但同时也打印了两个try块中的错误提示，说明推送注册和处理逻辑执行出问题
• MyFirebaseMessagingService的onMessageReceived方法从未被触发，断点无响应，pushNotificationMessageDataFromFCM始终无法获取到FCM推送数据
• 无论将代码放在onCreate()还是createAgent()中，问题都无法解决

疑问点 #

• 是否有代码需要分开放置？
• 为何FirebaseMessagingService未被调用？
• 为何推送操作似乎在token获取前执行？
• 其他相关建议？

内容的提问来源于stack exchange，提问作者pbhuter