Template for custom dialog whit callback

CustomDialog.kt

import android.os.Bundle
import android.view.Gravity
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.DialogFragment
import com.timbrit.profesionales.R
import org.jetbrains.anko.sdk27.coroutines.onClick

class CustomDialog : DialogFragment() {
    private lateinit var rootView: View
    private lateinit var callback: CallbackCustomDialog

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        rootView = inflater.inflate(R.layout.fragment_dialog, container, false)
        callback = targetFragment as CallbackCustomDialog
        return rootView
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        setUp()
    }

    override fun onResume() {
        super.onResume()
        val window = dialog?.window
        window?.setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)
        window?.setGravity(Gravity.CENTER)
    }

    private fun setUp() {
        rootView.btnFoo.onClick {  }
    }

    interface CallbackCustomDialog {
        fun callbackFoo(foo: String?)
    }
}