How to make placeholder items in Android RecyclerView Android

attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="MockPlaceHolder">
        <attr name="repeact" format="integer"/>
        <attr name="layoutRes" format="integer"/>
    </declare-styleable>

</resources>

loading_placeholder.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#bbb"/>
    <corners android:radius="3dp"/>
</shape>

MockPlaceHolder.kt

package com.store.ui.widget

import android.content.Context
import android.util.AttributeSet
import android.widget.LinearLayout

class MockPlaceHolder(context: Context, attrs: AttributeSet?): LinearLayout(context, attrs) {

    var repeact = 1
    var layoutResource = android.R.layout.activity_list_item

    init { init(attrs) }

    private fun init(attrs: AttributeSet?) {

        orientation = VERTICAL

        with(context.theme.obtainStyledAttributes(attrs, R.styleable.MockPlaceHolder, 0, 0)){

            try {

                repeact = getInteger(R.styleable.MockPlaceHolder_repeact, 1)
                layoutResource = getResourceId(R.styleable.MockPlaceHolder_layoutRes, android.R.layout.activity_list_item)

                for (i in 1..repeact){

                    addView(inflate(context, layoutResource, null))
                }

            } finally {  recycle() }

        }

    }

}

placeholder.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">

    <alpha
        android:fromAlpha="1.0"
        android:toAlpha="0.6"
        android:interpolator="@android:anim/accelerate_decelerate_interpolator"
        android:duration="1000"
        android:repeatMode="reverse"
        android:repeatCount="infinite"/>

</set>

placeholder_mock_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:padding="16dp">

    <com.store.ui.widget.PlaceHolderView
        android:layout_width="65dp"
        android:layout_height="65dp"
        android:layout_gravity="center" />


    <LinearLayout
        android:layout_marginLeft="16dp"
        android:layout_gravity="center"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <com.store.ui.widget.PlaceHolderView
            android:layout_width="wrap_content"
            android:layout_height="15dp" />

        <com.store.ui.widget.PlaceHolderView
            android:layout_marginTop="6dp"
            android:layout_width="match_parent"
            android:layout_marginRight="32dp"
            android:layout_height="15dp" />

        <com.store.ui.widget.PlaceHolderView
            android:layout_marginTop="6dp"
            android:layout_width="match_parent"
            android:layout_marginRight="64dp"
            android:layout_height="15dp" />


    </LinearLayout>

</LinearLayout>

PlaceHolderView.kt

package com.store.ui.widget

import android.content.Context
import android.util.AttributeSet
import android.view.View
import android.view.animation.AnimationUtils

class PlaceHolderView(context: Context, attrs: AttributeSet?): View(context, attrs)  {

    init {
        setBackgroundResource(R.drawable.loading_placeholder)
        startAnimation(AnimationUtils.loadAnimation(context, R.anim.placeholder))
    }

}