Sign-in and Sign-out methods

MainActivity.kt

    /**
     * Hook called when the user requests to sign-in to the application
     */
    private fun onLoginMenuItemSelected(): Boolean {
        // Close the options menu
        closeOptionsMenu()

        // Produce the Alert dialog with the login form
        val formView = layoutInflater.inflate(R.layout.login_form, null, false)
        val username = formView.find<EditText>(R.id.login_form_username)
        val password = formView.find<EditText>(R.id.login_form_password)

        AlertDialog.Builder(this)
            .setView(formView)
            .setNegativeButton("Cancel") { _, _ -> toast("Cancelled") }
            .setPositiveButton("Sign In") { _, _ -> model.signin(username.getContent(), password.getContent()) }
            .show()

        // We handled the request
        return true
    }

    /**
     * Hook called when the user requests to sign-out of the application
     */
    private fun onLogoutMenuItemSelected(): Boolean {
        // Close the options menu
        closeOptionsMenu()

        // Produce an Are You Sure? dialog
        alert("Are you sure you want to sign out?") {
            yesButton { model.signout() }
            noButton { }
        }.show()

        // We handled the request
        return true
    }