As a Android developer i also want this features for my Android application. If you’re in the line of my thought then this tutorial could help you more to implement Facebook like New Stories button in Android.
A library named PopupBubble can do this for you and easily Add “New Post” popup button with the feeds (RecyclerView) of your app.
Minimum sdk is 14 and support is limited to recyclerview for now.
Add With Gradle Dependency