PoppyView is a library which implements view on the bottom which come and go relative to the user scroll.
Just add the library to your application as a library project. And don't forget that your project must use NineOldAndroids.
Mortar / Flow / Dagger 2 requires to write a lot of boilerplate code. Auto Mortar is an annotation processor that focuses on eliminating the maximum of that boilerplate. No magic tricks here, just some straightforward and human readable code generated for you.