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data class Item( val name: String, val age: String )
/*
 * aggiusta build.gracle
 * make project cmd + F9
 * edita activity sia xml che classe
 * make project cmd + F9
 * leggi su:
 * https://developer.android.com/topic/libraries/data-binding/index.html
 * https://proandroiddev.com/modern-android-development-with-kotlin-september-2017-part-1-f976483f7bd6
 *
 * Questo è un esempio di Activity, AdapterExample contiene un esempio per adapter di RecyclerView
 * */
class Activity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        val binding: ActivityMainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)

        // aggiorna una view
        binding.mytextView.text = "Hello there"
        binding.executePendingBindings()

        // aggiorna una serie di view
        binding.apply {
            mytextView.text      = "Hello there"
            anotherTextView.text = "42"
        }.executePendingBindings()

        // bind di un oggetto 
        Handler().postDelayed({
            val item: Item = Item("marco", "18")
            binding.myvariable = item
            binding.executePendingBindings()
        }, 3000)


    }

}

class AdapterExample(val items: List<Item>): RecyclerView.Adapter<AdapterExample.ViewHolder>() {

    lateinit var binding: LayoutRowBinding

    override fun getItemCount(): Int = items.size

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder{

        binding = DataBindingUtil.inflate(LayoutInflater.from(parent.context), R.layout.launcher_row, parent, false)
        return ViewHolder(binding.root)

    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {

        holder.get( items[position] )

    }

    inner class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {

        fun get(item: Item) {

            binding.campaign = item
            binding.executePendingBindings()

        }

    }

}

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

    <data>
        <variable
            name="myvariable"
            type="io.github.mpao.example.Item"
            />
    </data>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/mytextView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentStart="true"
            android:layout_alignParentTop="true"
            android:padding="16dp"
            android:textSize="30sp"
            android:text="@{myvariable.name}"
            tools:text="Messaggio in arrivo"/>

        <TextView
            android:id="@+id/anotherTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/mytextView"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="50dp"
            android:text="@{myvariable.age}"
            android:textSize="30sp"/>

    </RelativeLayout>
</layout>

...
apply plugin: 'kotlin-kapt'

android {
    ...
    dataBinding.enabled = true

}


kapt {
    generateStubs = true
}

dependencies {
    ...
    // databinding
    kapt "com.android.databinding:compiler:3.0.0-beta6"
}