Custom tooltip (PopupWindow)

gistfile1.txt

Create and show tooltip right above BottomNavigationBar:

val popup = PopupWindow(this@MainActivity).apply {
    ItemPopupBinding.inflate(LayoutInflater.from(this@MainActivity)).apply {
        contentView = this.root
        root.setOnClickListener {
            dismiss()
        }
    }

    setBackgroundDrawable(ColorDrawable(Color.TRANSPARENT));
    animationStyle = R.style.Animation
}

binding.bottomNavigation.waitForLayout {
    popup.showAtLocation(binding.bottomNavigation, Gravity.BOTTOM, (binding.bottomNavigation.width / 5), // Put it above number 2 item from the left.
    (binding.bottomNavigation.height * 1.8).toInt()) // Multiply by 1.8 because our layout has a bit of margin inside the bottom image.
}

Item_popup.xml:
<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:elevation="8dp"
        android:gravity="center"
        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/tooltip_background"
            android:paddingStart="8dp"
            android:paddingTop="2dp"
            android:paddingEnd="8dp"
            android:paddingBottom="4dp"
            android:text="Get lucky"
            android:textColor="@color/white" />

        <ImageView
            android:layout_width="12dp"
            android:layout_height="12dp"
            android:layout_marginTop="-5dp"
            android:scaleType="center"
            android:src="@drawable/ic_arrow_drop_down_black_24dp" />

    </LinearLayout>

</layout>

tooltip_background.xml:
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <corners android:radius="4dp" />
    <solid android:color="@android:color/black" />

</shape>

ic_arrow_drop_down_black_24dp.xml:
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24.0"
    android:viewportHeight="24.0">

    <path
        android:fillColor="#FF000000"
        android:pathData="M7,10l5,5 5,-5z" />
</vector>

styles.xml:
<style name="Animation">
    <item name="android:windowEnterAnimation">@anim/fragment_fade_enter</item>
    <item name="android:windowExitAnimation">@anim/fragment_fade_exit</item>
</style>