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<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".ui.FragmentTwo">

    <com.google.android.material.appbar.AppBarLayout
            android:id="@+id/appbar_fragment_two"

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<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".ui.FragmentOne">

    <com.google.android.material.appbar.AppBarLayout
            android:id="@+id/appbar_fragment_one"

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<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".ui.MainActivity">

    <FrameLayout
            android:id="@+id/frame_layout"
            android:layout_width="match_parent"

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class AwesomeActivity : Activity(), CallbackListener {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstance)
        setContentView(R.layout.awesome_activity)
    } 
    override fun onCallback() {
        Toast.makeText(context, "onCallback called!", Toast.LENGTH_LONG).show()
    }
}

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class AwesomeFragment : Fragment() {
    private var callback: CallbackListener? = null
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_awesome, container, false)
    }
    override fun onActivityCreated(savedInstanceState: Bundle?) {

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interface CallbackListener {
    fun onCallback()
}

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//versions
    ext.kotlin_version = '1.2.51'
    ext.support_version = '27.1.1'
    ext.dagger_version = '2.16'
    ext.room_version = '1.1.1'

dependencies {
    // Kotlin
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

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@{ alguma_expressao }

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apply plugin: 'kotlin-kapt'

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

    val binding: ListContactItemBinding? = DataBindingUtil.bind(view)

}