Saving Data on Android

Chapter 13: Reading to and Writing from Realtime Database
: CRUD means 
Create Retrieve Update and Delete and it's a way to summarise the main 
operations you can do on a DB. In this chapter, you'll learn how to execute read 
and write operations into a Realtime Database from an Android application.
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Chapter 14: Realtime Database Offline Capabilities
: Mobile applications run 
on a device with limited resources. In particular, a phone or a tablet is not always 
connected to the network and some feature hs to be implemented when you need 
to write and read data from a remote database. In this chapter, you'll learn how to 
manage data when the device is offline.
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