Kotlin 中布局的可見性

Question

我有一個布局，我想在單擊按鈕時使其可見（首先是“GONE”）。

<include
    android:id="@+id/registration_layout"
    layout="@layout/user_registration"
    android:visibility="gone"/>
<include
    android:id="@+id/login_layout"
    layout="@layout/login"
    android:visibility="gone"/>

這是我在 xml 文件中包含的內容

fun onClickLogin(view: View) {
    val login_layout = R.id.login_layout as Layout
    val registration_layout = R.id.login_layout as Layout
    login_layout.visibility = View.VISIBLE

    val btn_login = R.id.registration as Button
    val btn_registration = R.id.registration as Button
    btn_login.visibility = View.VISIBLE
}

在我的 kotlin 文件中，按鈕的可見性有效但布局無效......有什么建議嗎？ 謝謝！

Answer 1

而不是轉換為Layout ，將布局轉換為View ：

fun onClickLogin(view: View) {
    val login_layout = R.id.login_layout as View //note : from import android.view.View
    val registration_layout = R.id.registration_layout as View //note: you wrote R.id.login_layout
    login_layout.visibility = View.VISIBLE
    registration_layout.visibility = View.GONE

    val btn_login = R.id.btn_login as Button
    val btn_registration = R.id.registration as Button
    btn_login.visibility = View.VISIBLE
    btn_registration = View.GONE
}