Custom view template

import android.content.Context
import android.util.AttributeSet
import android.view.View
import androidx.core.content.withStyledAttributes

class MyCustomView(
    context: Context,
    attrs: AttributeSet? = null
) : View(context, attrs) {
    init {
        context.withStyledAttributes(attrs, R.styleable.MyCustomView) {
        }
    }
}

// Also set
// <declare-styleable name="MyCustomView">
//     <attr name="someAttribute" format="color"/>
// </declare-styleable>