Android(Kotlin)如何按屏幕占比缩放View？实现单屏显示8个Strip

我用Android Studio+Kotlin开发应用，界面里有个HorizontalScrollView，它内部的LinearLayout需要加载大量（无限个）strip_view.xml布局（每个对应一个音频通道Strip）。我的需求是让每个Strip的宽度刚好是屏幕宽度的1/8，这样能始终一次性显示8个Strip，同时支持横向滚动。

目前主布局外层是ConstraintLayout嵌套HorizontalScrollView，内部LinearLayout为横向排列；Strip布局外层是ConstraintLayout，包含一个TextView和Button。

我试了两种方案都没成功，问题出在获取LinearLayout宽度时它始终为0，导致设置后的Strip直接消失。注意：项目不能用RecyclerView，别给相关方案。

方案1：加载前缩放视图 #

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

        val inflater = LayoutInflater.from(this)
        val listOfStrips: List<Strip> = List(50) { Strip(it + 1) }
        val llScrollableContent = findViewById<LinearLayout>(R.id.llScrollableContent)
        val stripWidth = llScrollableContent.width / 8


        for (strip in listOfStrips) {
            val stripLayout = inflater.inflate(R.layout.strip_view, llScrollableContent, false)
            val title: TextView = stripLayout.findViewById<TextView>(R.id.tvStripTitle)
            val stripContainer: ConstraintLayout =
                stripLayout.findViewById<ConstraintLayout>(R.id.clStripContainer)

            val layoutParams = stripContainer.layoutParams as LayoutParams
            layoutParams.width = stripWidth
            stripContainer.layoutParams = layoutParams


            title.text = strip.id.toString()
            llScrollableContent.addView(stripLayout)
        }
    }
}

方案2：先加载布局再缩放视图 #

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

        val inflater = LayoutInflater.from(this)

        val listOfStrips: List<Strip> = List(50) {Strip(it + 1) }
        val llScrollableContent = findViewById<LinearLayout>(R.id.llScrollableContent)


        for(strip in listOfStrips){
            val stripLayout = inflater.inflate(R.layout.strip_view, llScrollableContent, false)
            val title: TextView = stripLayout.findViewById<TextView>(R.id.tvStripTitle)
            val stripContainer: ConstraintLayout = stripLayout.findViewById<ConstraintLayout>(R.id.clStripContainer)

            title.text = strip.id.toString()
            llScrollableContent.addView(stripLayout)
        }

        val stripWidth = llScrollableContent.width / 8
        for(i in 0 until llScrollableContent.childCount){
            val childView = llScrollableContent.getChildAt(i)
            val layoutParamsStrip = childView.layoutParams
            layoutParamsStrip.width = stripWidth
            childView.layoutParams = layoutParamsStrip
        }
    }
}

补充：布局XML文件 #

activity_main.xml

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/clOuter"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <HorizontalScrollView
        android:id="@+id/hsvStripeContainer"
        android:layout_width="match_parent"
        android:layout_height="310dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <LinearLayout
            android:id="@+id/llScrollableContent"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:orientation="horizontal"></LinearLayout>
    </HorizontalScrollView>

</androidx.constraintlayout.widget.ConstraintLayout>

strip_view.xml

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/clStripContainer"
    android:layout_width="100dp"
    android:layout_height="200dp"
    android:orientation="vertical">

    <Button
        android:id="@+id/button"
        android:layout_width="84dp"
        android:layout_height="82dp"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/tvStripTitle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="default text"
        app:layout_constraintBottom_toTopOf="@+id/button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

内容的提问来源于stack exchange，提问作者MaDudeeK