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class MainActivity : AppCompatActivity() {
    private val coroutineScope = CoroutineScope(Dispatchers.IO)
    private val googleAuthController: GoogleAuthController by lazy {
        GoogleAuthController(this)
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val userIdTextView = findViewById<TextView>(R.id.user_id_text_view)
        val signInButton = findViewById<Button>(R.id.sign_in_button)
        signInButton.setOnClickListener {
            googleAuthController.startSignIn {
                coroutineScope.launch {
                    val token = Tasks.await(it.getIdToken(true)).token
                    withContext(Dispatchers.Main) {
                        userIdTextView.text = token
                    }
                }
            }
        }

        val signOutButton = findViewById<Button>(R.id.sign_out_button)
        signOutButton.setOnClickListener {
            googleAuthController.startSignOut()
            userIdTextView.text = ""
        }

        coroutineScope.launch {
            val currentUser = googleAuthController.currentUser
            if (currentUser != null) {
                val token = Tasks.await(currentUser.getIdToken(true)).token
                withContext(Dispatchers.Main) {
                    userIdTextView.text = token
                }
            }
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        googleAuthController.onActivityResult(requestCode, resultCode, data)
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/user_id_text_view"
        android:layout_width="0dp"
        android:layout_height="0dp"a
        android:gravity="center"
        android:textSize="16sp"
        app:layout_constraintBottom_toTopOf="@id/sign_in_button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/sign_in_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Sign In"
        app:layout_constraintTop_toBottomOf="@id/user_id_text_view"
        app:layout_constraintBottom_toTopOf="@id/sign_out_button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/sign_out_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Sign Out"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@id/sign_in_button"
        app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>