Crear un cuadro de diálogo personalizado en Android con Kotlin

Para crear un cuadro de diálogo personalizado se puede usar DialogFragment para mantener la rotación de la vista y MaterialDialog para mostrar el cuadro de diálogo.

Declaración de cuadro de diálogo personalizado

class CustomOneDialog : DialogFragment() {


    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {

        val binding = DialogCustomOneBinding.inflate(layoutInflater)

        binding.btnDone.setOnClickListener {
            dialog?.dismiss()
        }

        val dialog = MaterialAlertDialogBuilder(
            requireActivity(),
            R.style.MaterialAlertDialog_CustomBorders
        ).apply {
            setView(binding.root)

            setOnKeyListener { _, keyCode, keyEvent ->
                if (keyCode == KeyEvent.KEYCODE_BACK && keyEvent.action == KeyEvent.ACTION_UP) {
                    dismiss()
                    true
                } else false
            }

        }.create()

        dialog.getWindow()?.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))

        return dialog
    }

}

Layout de diálogo

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:background="@drawable/dialog_custom_borders"
        android:orientation="vertical"
        android:paddingStart="16dp"
        android:paddingTop="48dp"
        android:paddingEnd="16dp"
        android:paddingBottom="16dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="@string/dialog_congratulations_title"
            android:textAppearance="@style/TextAppearance.MaterialComponents.Headline5"
            android:textStyle="bold" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:gravity="center"
            android:text="@string/dialog_congratulations_summary"
            android:textAppearance="@style/TextAppearance.MaterialComponents.Body1" />

        <com.google.android.material.button.MaterialButton
            android:id="@+id/btn_done"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_marginTop="16dp"
            android:text="@android:string/ok"
            android:textColor="@color/md_white_1000"
            app:shapeAppearance="@style/ShapeAppearance.Capsule" />

    </LinearLayout>


    <androidx.appcompat.widget.AppCompatImageView
        android:id="@+id/appCompatImageView"
        android:layout_width="68dp"
        android:layout_height="68dp"
        android:layout_marginTop="-28dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/linearLayout"
        app:srcCompat="@drawable/circle_rounded_filled" />


</androidx.constraintlayout.widget.ConstraintLayout>

Recursos

//styles.xml
<style name="ShapeAppearance.Capsule" parent="ShapeAppearance.MaterialComponents.SmallComponent">
    <item name="cornerFamily">rounded</item>
    <item name="cornerSize">50%</item>
</style>


//circle_rounded_filled.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:ignore="UnusedResources">
    <item>
        <shape android:shape="oval">
            <size
                android:width="34dp"
                android:height="34dp" />
            <solid android:color="@color/md_light_green_A700" />
            <stroke
                android:width="2dp"
                android:color="?android:colorBackgroundFloating" />
        </shape>
    </item>
    <item
        android:drawable="@drawable/ic_baseline_done_24"
        android:gravity="center" />
</layer-list>

//dialog_custom_border.xml
<?xml version="1.0" encoding="utf-8"?>
<inset xmlns:android="http://schemas.android.com/apk/res/android"
    android:insetLeft="5dp"
    android:insetTop="5dp"
    android:insetRight="5dp"
    android:insetBottom="5dp">

    <shape android:shape="rectangle">
        <corners android:radius="16dp" />
        <solid android:color="?android:colorBackgroundFloating" />
        <stroke
            android:width="5dp"
            android:color="?android:colorBackgroundFloating" />
    </shape>

</inset>

Modo oscuro