Unity Firebase消息传递未在Android 4.1.2上初始化

Question

我有一个Unity游戏，我在其中使用Firebase消息服务来发送推送通知。

我正在使用Firebase Unity SDK 3.0.3版

它可以在我的Galaxy S7上运行，但是当我在运行Android 4.1.2的S2上尝试时，Firebase会在我初始化时抛出异常。

Firebase.Messaging.FirebaseMessaging.TokenReceived += OnTokenReceived;

当我调用上面的代码

时，以下是来自logcat（adb logcat -s Unity）的日志

I/Unity   ( 8751): Firebase App initializing app com.ARTEFICER.fruitfall (default 1).
I/Unity   ( 8751): InitializationException:  Firebase modules failed to initialize: messaging (missing dependency)
I/Unity   ( 8751):   at Firebase.FirebaseApp.CreateAndTrack (Firebase.CreateDelegate createDelegate) [0x00000] in <filename unknown>:0
I/Unity   ( 8751):   at Firebase.FirebaseApp.Create () [0x00000] in <filename unknown>:0
I/Unity   ( 8751):   at Firebase.FirebaseApp.get_DefaultInstance () [0x00000] in <filename unknown>:0
I/Unity   ( 8751):   at Firebase.Messaging.FirebaseMessaging+Listener..ctor () [0x00000] in <filename unknown>:0
I/Unity   ( 8751):   at Firebase.Messaging.FirebaseMessaging+Listener.Create () [0x00000] in <filename unknown>:0
I/Unity   ( 8751):   at Firebase.Messaging.FirebaseMessaging..cctor () [0x00000] in <filename unknown>:0
I/Unity   ( 8751): Rethrow as TypeInitializationException: An exception was thrown by the type initializer for Firebase.Messaging.FirebaseMessaging
I/Unity   ( 8751):   at FireBaseSetup.Start () [0x00000] in <filename unknown>:0

Firebase的最低API级别显然是14.上面的4.1.2。