activity_alert_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
        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=".activity.AlertDialogActivity">

    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Alert Dialog"
            android:textAllCaps="false"
            android:paddingStart="8dp"
            android:paddingEnd="8dp"
            android:id="@+id/btn_alert"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:layout_marginTop="15dp"/>

    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Alert Custom Dialog"
            android:textAllCaps="false"
            android:paddingStart="8dp"
            android:paddingEnd="8dp"
            android:id="@+id/btn_alert_custom"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/btn_alert"
            android:layout_marginTop="15dp"/>

</androidx.constraintlayout.widget.ConstraintLayout>