activity_main.xml

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

<FrameLayout
        android:id="@+id/root"
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">

    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            tools:context=".MainActivity"
            android:orientation="vertical"
            android:id="@+id/content">

        <TextView
                android:text="Давайте познакомимся"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/textView"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"
                android:textSize="24sp"
                android:textColor="#FF000000"/>

        <Button
                android:text="1. Показать простой диалог"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/btn_1"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"/>

        <Button
                android:text="2. Показать простой диалог со списком"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/btn_2"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"/>


        <Button
                android:text="3. Показать диалог с кастомным макетом"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/btn_3"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"/>

        <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="4. Полноэкранный кастомный диалог"
                android:id="@+id/btn_4"
                android:layout_marginStart="8dp"
                android:layout_marginTop="8dp"/>

    </LinearLayout>
</FrameLayout>

dialog_4.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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"
        android:background="@color/colorBackground">

    <EditText
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:inputType="textPersonName"
            android:ems="10"
            android:id="@+id/etName"
            android:layout_marginEnd="8dp"
            app:layout_constraintEnd_toEndOf="parent"
            android:layout_marginStart="8dp"
            app:layout_constraintStart_toStartOf="parent"
            android:layout_marginTop="8dp"
            app:layout_constraintTop_toTopOf="parent"
            android:hint="Имя"/>

    <EditText
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:inputType="textPersonName"
            android:hint="Компания"
            android:ems="10"
            android:id="@+id/etCompany"
            android:layout_marginEnd="8dp"
            app:layout_constraintEnd_toEndOf="parent"
            android:layout_marginStart="8dp"
            app:layout_constraintStart_toStartOf="parent"
            android:layout_marginTop="8dp"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintTop_toBottomOf="@+id/etName"/>

    <Button
            android:text="ОК"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/btnOk"
            android:layout_marginBottom="8dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            android:layout_marginEnd="8dp"/>

    <CheckBox
            android:id="@+id/cbStats"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Отправлять статистику"
            android:layout_marginBottom="8dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            android:layout_marginStart="8dp"/>
</android.support.constraint.ConstraintLayout>

FullscreenCustomDialogFragment.kt

package io.github.dvegasa.dialogs

import android.app.Dialog
import android.content.Context
import android.os.Bundle
import android.support.v4.app.DialogFragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.view.Window
import kotlinx.android.synthetic.main.dialog_4.view.*



/**
 * 07.08.2019
 */
class FullscreenCustomDialogFragment : DialogFragment() {

    private lateinit var callback: Callback

    interface Callback {
        fun dialog4_result(name: String, company: String)
    }

    override fun onAttach(context: Context) {
        super.onAttach(context)
        if (context is Callback) {
            callback = context
        } else {
            throw Exception("${activity.toString()} must implement interface ${this}.Callback")
        }
    }

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        super.onCreateView(inflater, container, savedInstanceState)

        val view = inflater.inflate(R.layout.dialog_4, container, false)
        view.btnOk.setOnClickListener {
            callback.dialog4_result(
                name = view.etName.text.toString(),
                company = view.etCompany.text.toString()
            )
            dismiss()
        }
        return view
    }

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val dialog = super.onCreateDialog(savedInstanceState)
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE)
        dialog.window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)

        return dialog
    }
}