如何从GoogleCredential迁移到GoogleCredentials并仍然可以访问PeopleAPI？

背景

对于我正在开发的应用程序，它使用使用凭据（用户登录）的 People API。一旦用户提供凭据，我就可以访问各种 Google API，例如 People API。一个例子是获取联系人列表：

https://developers.google.com/people/api/rest/v1/people.connections/list

我注意到该类com.google.api.client.googleapis.auth.oauth2.GoogleCredential已被弃用：

https://googleapis.dev/java/google-api-client/latest/com/google/api/client/googleapis/auth/oauth2/GoogleCredential.html

问题

该应用程序具有基于一些旧 G+ 代码（此处）的旧代码，可通过 Google 帐户联系联系人。这是其中最重要部分的一个片段，这让我无法迁移它：

object GoogleOuthHelper {
    @WorkerThread
    fun setUp(context: Context, serverAuthCode: String?): Services {
        val httpTransport: HttpTransport = NetHttpTransport()
        val jsonFactory = JacksonFactory.getDefaultInstance()
        // Redirect URL for web based applications. Can be empty too.
        val redirectUrl = "urn:ietf:wg:oauth:2.0:oob"
        // Exchange auth code for access token
        val tokenResponse = GoogleAuthorizationCodeTokenRequest(
            httpTransport, jsonFactory, GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET,
            serverAuthCode, redirectUrl)
            .execute()
        // Then, create a GoogleCredential object using the tokens from GoogleTokenResponse
        val credential = GoogleCredential.Builder()
            .setClientSecrets(GOOGLE_CLIENT_ID, GOOGLE_CLIENT_SECRET)
            .setTransport(httpTransport)
            .setJsonFactory(jsonFactory)
            .build()
        val accessToken = tokenResponse.accessToken
        getDefaultSecuredSharedPreferences(context).edit()
            .putString(SecuredSharedPreferences.KEY__GOOGLE_ACCESS_TOKEN, accessToken).apply()
        credential.setFromTokenResponse(tokenResponse)
        val appPackageName = context.packageName
        val peopleServiceApi = PeopleService.Builder(httpTransport, jsonFactory, credential)
            .setApplicationName(appPackageName)
            .build()
        val peopleService = peopleServiceApi.people()
        val otherContactsService = peopleServiceApi.otherContacts()
        val contactGroups = peopleServiceApi.contactGroups()
        return Services(peopleService, otherContactsService, contactGroups)
    }

    class Services(
        /**https://developers.google.com/people/api/rest/v1/people*/
        val peopleService: PeopleService.People,
        /**https://developers.google.com/people/api/rest/v1/otherContacts*/
        val otherContactsService: OtherContacts,
        /**https://developers.google.com/people/api/rest/v1/contactGroups*/
        val contactGroups: ContactGroups)
}

问题甚至从一开始就存在：

班级GoogleCredentials似乎不接受我在GoogleCredential班级上得到的任何东西。

要添加更多内容，此函数将“serverAuthCode”作为参数，该参数来自GoogleSignInAccount，但要获取它，我需要使用已弃用的GoogleApiClient类：

        fun prepareGoogleApiClient(someContext: Context): GoogleApiClient {
            val context = someContext.applicationContext ?: someContext
            val gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestServerAuthCode(GOOGLE_CLIENT_ID)
                .requestEmail()
                .requestScopes(
                    Scope(PeopleServiceScopes.CONTACTS_READONLY),
                    Scope(PeopleServiceScopes.USERINFO_PROFILE),
                    Scope(PeopleServiceScopes.USER_EMAILS_READ),
                    Scope(PeopleServiceScopes.CONTACTS),
                    Scope(PeopleServiceScopes.CONTACTS_OTHER_READONLY)
                )
                .build()
            return GoogleApiClient.Builder(context)
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build()
        }

这就是我用它做的：

val connectionResult = googleApiClient!!.blockingConnect()
if (!connectionResult.isSuccess)
    return
val operation = Auth.GoogleSignInApi.silentSignIn(googleApiClient)
val googleSignInResult: GoogleSignInResult = operation.await()
val googleSignInAccount = googleSignInResult.signInAccount
//use googleSignInAccount.serverAuthCode in setUp() function above

Gradle 文件具有以下依赖项：

// https://mvnrepository.com/artifact/com.google.auth/google-auth-library-oauth2-http
implementation 'com.google.auth:google-auth-library-oauth2-http:0.26.0'
// https://github.com/googleapis/google-api-java-client-services/tree/master/clients/google-api-services-people/v1#gradle   https://mvnrepository.com/artifact/com.google.apis/google-api-services-people
implementation 'com.google.apis:google-api-services-people:v1-rev20210515-1.31.0'

我试过的

除了查看文档（并且没有看到与我必须处理的内容相似）之外，我尝试在这里写下这个。

可悲的是，我还找不到如何从旧代码迁移。

我试图在那里问我如何迁移（这里和这里），但还没有得到答案。

问题

如何在仍然使用各种 API（例如 People API）的同时从 迁移GoogleCredential到GoogleCredentials？

换句话说：如何在 Android 上避免使用任何已弃用的类（GoogleCredential 和 GoogleApiClient），同时仍然能够使用各种 API？