使用下面网址提出的替代方法

https://medium.com/@karlwhiteprivate/flutter-facebook-sign-in-with-firebase-in-2020-66556a8c3586

接入后遇到以下的问题：

1. Flutter 接入firebase_auth 后安卓build运行闪退

AndroidRuntime: FATAL EXCEPTION: GoogleApiHandler

java.lang.AbstractMethodError: abstract method "com.google.android.gms.common.api.Api$Client com.google.android.gms.common.api.Api$AbstractClientBuilder.buildClient(android.content.Context, android.os.Looper, com.google.android.gms.common.internal.ClientSettings, java.lang.Object, com.google.android.gms.common.api.GoogleApiClient$ConnectionCallbacks, com.google.android.gms.common.api.GoogleApiClient$OnConnectionFailedListener)"

参考https://blog.csdn.net/u010127332/article/details/88170812，解决冲突

在iOS上集成报错GoogleUtilities/GULAppEnvironmentUtil.h' file not found, build failing in iOS

flutter clean

pod install

pod update 后解决