DrawerListView with width by Material design guidelines

DrawerListView.kt

public class DrawerListView(context: Context, attrs: AttributeSet) : ListView(context, attrs) {
    val widthCalculated : Int

    init {
        val displayMetrics = getContext().getResources().getDisplayMetrics()
        val maxWidth = Math.round(400 * displayMetrics.xdpi / DisplayMetrics.DENSITY_DEFAULT)

        val wm = getContext().getSystemService(Context.WINDOW_SERVICE) as WindowManager
        val size = Point()
        wm.getDefaultDisplay().getSize(size)
        val windowWidth = size.x

        val styledAttrs = getContext().getTheme().obtainStyledAttributes(intArray(android.R.attr.actionBarSize))
        val abSize = styledAttrs.getDimension(0, 0f)
        styledAttrs.recycle()

        widthCalculated = Math.min((windowWidth - abSize).toInt(), maxWidth)
    }

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        super.onMeasure(View.MeasureSpec.makeMeasureSpec(widthCalculated, View.MeasureSpec.EXACTLY), heightMeasureSpec)
    }
}