A Super simple library can be used for inserting elements in between RecyclerView's elements.
Skygear Server is a cloud backend for making web and mobile app development easier https://skygear.io.
The Skygear Android SDK library that gives you access to the Skygear Server from your Android app.
SlideDateTimePicker is an Android library that displays a single DialogFragment in which the user can select a date and a time. The user can swipe between the DatePicker and TimePicker, and the tab underline will gradually animate as the user swipes. The colors of the tab indicator and divider lines are customizable to fit your project's theme.