A simple class to extend when creating a custom view that has some width and height requirement.

SizedView.kt

import android.content.Context
import android.graphics.RectF
import android.util.AttributeSet
import android.view.View
import androidx.annotation.Nullable
import kotlin.math.min

abstract class SizedView @JvmOverloads constructor(
    context: Context,
    @Nullable attrs: AttributeSet? = null,
    defStyleAttr: Int = 0,
    defStyleRes: Int = 0
) : View(context, attrs, defStyleAttr, defStyleRes) {

    abstract val desiredWidth: Float
    abstract val desiredHeight: Float

    val paddingBox: RectF = RectF()

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        val desiredWidth = desiredWidth.toInt() + paddingStart + paddingEnd
        val desiredHeight = desiredHeight.toInt() + paddingTop + paddingBottom

        val widthMode = MeasureSpec.getMode(widthMeasureSpec)
        val widthSize = MeasureSpec.getSize(widthMeasureSpec)
        val heightMode = MeasureSpec.getMode(heightMeasureSpec)
        val heightSize = MeasureSpec.getSize(heightMeasureSpec)

        val width: Int = when (widthMode) {
            MeasureSpec.EXACTLY -> widthSize
            MeasureSpec.AT_MOST -> min(desiredWidth, widthSize)
            else -> desiredWidth
        }

        val height: Int = when (heightMode) {
            MeasureSpec.EXACTLY -> heightSize
            MeasureSpec.AT_MOST -> min(desiredHeight, heightSize)
            else -> desiredHeight
        }
        setMeasuredDimension(width, height)
    }

    override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
        super.onSizeChanged(w, h, oldw, oldh)
        paddingBox.set(
            paddingStart.toFloat(),
            paddingTop.toFloat(),
            width.toFloat() - paddingRight.toFloat(),
            height.toFloat() - paddingBottom.toFloat()
        )
    }
}