attrs.xml

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

  <declare-styleable name="ConditionalView">
    <attr name="condition" format="boolean"/>
    <attr name="ifTrue" format="reference"/>
    <attr name="ifFalse" format="reference"/>
  </declare-styleable>

</resources>

booleans.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <bool name="myFeatureCondition">true</bool>
</resources>

ConditionalView.kt

package be.xzan.test

import android.content.Context
import android.support.annotation.LayoutRes
import android.util.AttributeSet
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup

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

  private val condition: Boolean
  @LayoutRes
  private val ifTrueLayout: Int
  @LayoutRes
  private val ifFalseLayout: Int

  init {
    val a = context.theme.obtainStyledAttributes(attrs, R.styleable.ConditionalView, 0, 0)

    try {
      condition = a.getBoolean(R.styleable.ConditionalView_condition, false)
      ifTrueLayout = a.getResourceId(R.styleable.ConditionalView_ifTrue, 0)
      ifFalseLayout = a.getResourceId(R.styleable.ConditionalView_ifFalse, 0)
    } finally {
      a.recycle()
    }
  }

  override fun onAttachedToWindow() {
    super.onAttachedToWindow()
    with(parent as ViewGroup) {
      val view = LayoutInflater.from(context).inflate(if (condition) ifTrueLayout else ifFalseLayout, this, false)
      val index = indexOfChild(this@ConditionalView)
      removeView(this@ConditionalView)
      addView(view, index)
    }
  }
}

imageview.xml

<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
  android:src="@mipmap/ic_launcher"
  android:layout_width="48dp"
  android:layout_height="48dp"/>

main_activity.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="match_parent"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  android:gravity="center"
  android:orientation="vertical">

  <TextView
    android:text="First View"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

  <TextView
    android:text="Second View"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

  <be.xzan.test.ConditionalView
    app:condition="@bool/myFeatureCondition"
    app:ifTrue="@layout/textview"
    app:ifFalse="@layout/imageview"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

  <TextView
    android:text="Fourth View"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

  <TextView
    android:text="Fifth View"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

</LinearLayout>

textview.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text="Some text for third view :)"/>