在App上接google账号登录的过程中遇到如下报错：
Exception com.google.android.gms.common.api.ApiException: 12500:
at com.google.android.gms.common.internal.zzb.zzz(Unknown Source)
at com.google.android.gms.auth.api.signin.GoogleSignIn.getSignedInAccountFromIntent(Unknown Source)
at com.ewise.android.api.MainActivity.onActivityResult(SignInActivity.java:89) at android.app.Activity.dispatchActivityResult(Activity.java:7010)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4187)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4234)
at android.app.ActivityThread.-wrap20(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1584)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6316)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)
解决办法：
在firebase上对自己的应用进行如下配置，如图所示：
firebase上对应用进行配置.png
1.设置support email；
2.设置SHA-1的指纹秘钥（至于SHA-1怎么生成的网上一大堆）
3.保证自己应用里面的google-serices.json文件要是firebase上面最新下载下来的
参考链接：https://stackoverflow.com/questions/47632035/google-sign-in-error-12500
