How to create an transparent alert dialog at bottom of screen with icon sticking out. Like this - https://imgur.com/a/PcEOEbJ

dialog_nps.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/transparent"
    android:gravity="center"
    android:orientation="vertical">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:background="@color/md_blue_grey_600"
        android:paddingTop="45dp">

        <TextView
            android:id="@+id/titleTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:fontFamily="@font/medium_font"
            android:text="Enjoying App?"
            android:textColor="@color/white"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/descTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/titleTextView"
            android:layout_centerHorizontal="true"
            android:layout_marginLeft="16dp"
            android:layout_marginTop="16dp"
            android:layout_marginRight="16dp"
            android:fontFamily="@font/regular_font"
            android:gravity="center"
            android:text="Recommend Android dev to your friends cuz you shouldn't suffer alone"
            android:textColor="@color/white"
            android:textSize="15sp" />

        <TextView
            android:id="@+id/notNotButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/descTextView"
            android:layout_alignBottom="@+id/rateAppTextView"
            android:layout_marginTop="32dp"
            android:layout_marginRight="16dp"
            android:layout_toLeftOf="@+id/rateAppTextView"
            android:background="?selectableItemBackground"
            android:fontFamily="@font/medium_font"
            android:gravity="center"
            android:padding="8dp"
            android:text="Not Now"
            android:textColor="@color/accent" />

        <Button
            android:id="@+id/rateAppTextView"
            style="@style/Widget.MaterialComponents.Button.Icon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/descTextView"
            android:layout_alignParentRight="true"
            android:layout_marginTop="32dp"
            android:layout_marginRight="16dp"
            android:layout_marginBottom="8dp"
            android:fontFamily="@font/medium_font"
            android:text="Rate App"
            android:textColor="@color/black"
            android:textSize="13sp" />

    </RelativeLayout>

    <ImageView
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:layout_centerHorizontal="true"
        android:src="@drawable/ic_launcher_512" />

</RelativeLayout>

some_activity.kt

override fun showNpsDialog() {
    val builder = AlertDialog.Builder(this, R.style.NpsDialogStyle)
    builder.setTitle(null)
    builder.setMessage(null)
    builder.setView(R.layout.dialog_nps)

    builder.setCancelable(false)

    val dialog = builder.create()

    val window = dialog.window
    /*
    This is to set the background of the dialog transparent so that the icon shows up half outside
    the dialog
     */
    window?.setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT))
    //This is to set the dialog at the bottom of the screens
    window?.setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)
    val wlp = window?.attributes
    wlp?.gravity = Gravity.BOTTOM
    window?.attributes = wlp

    dialog.setOnShowListener {
        val rateAppButton = dialog.findViewById<Button>(R.id.rateAppTextView)!!
        val notNowButton = dialog.findViewById<TextView>(R.id.notNotButton)!!

        rateAppButton.setOnClickListener {
            //TODO take to play store
            dialog.dismiss()
        }
        notNowButton.setOnClickListener {
            //TODO add logic to show dialog to user later
            dialog.dismiss()
        }
    }
    dialog.show()
}

styles.xml

<style name="NpsDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert">
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowIsFloating">false</item>
</style>