Google Sign-In Button - Activity

SignInActivity.kt

private lateinit var signInButton: SignInButton

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    setContentView(R.layout.activity_sign_in)

    initViews()
}

private fun initViews() {
    signInButton = findViewById(R.id.sign_in_button) as SignInButton

    signInButton.setSize(SignInButton.SIZE_WIDE)

    signInButton.setOnClickListener {
        initiateGoogleSignIn()
    }
}