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我正在构建一个应用程序，但我目前面临一个问题：我按照谷歌指南在 LoginActivity 中编写了我的 Google/Facebook 登录按钮的所有事件。但是，我不想将业务代码保留在活动中以遵循 MVVM 架构。因此，我如何放置 Firebase 方法（需要活动引用和生命周期回调）？

我试过一个 LoginViewModel 正在工作，但它有对 LoginActivity 的引用

class LoginViewModel(application: Application) : BaseViewModelContext(application) {

    lateinit var auth: FirebaseAuth
    val Tag: String = LoginViewModel::class.java.simpleName;
    val gso: GoogleSignInOptions
    val googleSignInClient: GoogleSignInClient

    init {
        auth = FirebaseAuth.getInstance()
        gso = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
            .requestIdToken(application.getString(R.string.default_client_id))
            .build()

        googleSignInClient = GoogleSignIn.getClient(application, gso)
    }



    fun activityForResultLogin(requestCode:Int, resultCode: Int, data: Intent?, activity: Activity){
        if(requestCode == Constants.RC_SIGN_IN){
            val task = GoogleSignIn.getSignedInAccountFromIntent(data)
            try {
                // Google Sign In was successful, authenticate with Firebase
                val account …