Kotlin Android Extensions: How to get a reference to a view in a layout that gets included into another layout?

Question

I have a layout that includes another layout:

activity_main.xml:

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

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView"/>

    <include layout="@layout/included_layout" />

</LinearLayout>

included_layout.xml

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

    <TextView
        android:id="@+id/includedTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Included TextView"/>

</LinearLayout>

How can I get a reference to the TextView in the included layout? Is it not supported (yet)?

MainActivity:

import android.app.Activity
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import kotlinx.android.synthetic.activity_main.*

class MainActivity : AppCompatActivity(){

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        textView.text = "text" // works!
        textViewInclude.text = "textInclude" // does not work: "Unresolved reference: textViewInclude "
    }
}

Answer 1

You should import the included layout.

import android.app.Activity
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.included_layout.* // Here

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // From activity_main.textView
        textView.text = "text" 

        // From included_layout.textViewInclude
        textViewInclude.text = "textInclude"
    }
}