IconButton for Android

IconButton.kt

import android.content.Context
import android.graphics.drawable.Drawable
import android.support.annotation.ColorInt
import android.support.v7.widget.LinearLayoutCompat
import android.util.AttributeSet
import android.view.Gravity
import android.widget.ImageView
import android.widget.LinearLayout
import android.widget.TextView

class IconButton : LinearLayoutCompat {
    private var text: String = ""
    private var icon: Drawable? = null
    private var textView: TextView? = null
    private var imageView: ImageView? = null

    constructor(context: Context, attrs: AttributeSet? = null) :
            super(context, attrs, 0) {
        init(attrs)
    }

    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) :
            super(context, attrs, defStyleAttr) {
        init(attrs)
    }

    private fun init(attrs: AttributeSet?) {
        isFocusable = true
        isClickable = true
        orientation = LinearLayout.HORIZONTAL
        gravity = Gravity.CENTER
        minimumHeight = context.dpToPx(48F)

        val typedArray = context.theme
                .obtainStyledAttributes(attrs, R.styleable.IconButton, 0, 0)

        text = typedArray.getString(R.styleable.IconButton_text) ?: ""
        icon = typedArray.getDrawable(R.styleable.IconButton_src)

        addImageView()
        addTextView()
    }

    fun setTextColor(@ColorInt color: Int) {
        textView?.setTextColor(color)
    }

    fun setIcon(drawable: Drawable) {
        if (imageView == null) {
            createImageView(drawable)
            return
        }
        imageView?.setImageDrawable(drawable)
    }

    private fun addTextView() = addView(createTextView(text))

    private fun addImageView() {
        if (icon != null)
            addView(createImageView(icon!!))
    }

    private fun createImageView(drawable: Drawable): ImageView? {
        imageView = ImageView(context)
        imageView?.setImageDrawable(drawable)
        return imageView
    }

    private fun createTextView(text: String): TextView? {
        textView = TextView(context)
        textView?.text = text
        return textView
    }
}

//////////////////
////////////////// attrs
//////////////////
<attr name="src" format="reference|color" />
<attr name="text" format="string" />
<declare-styleable name="IconButton">
  <attr name="src" />
  <attr name="text" />
</declare-styleable>