Saving Data on Android

Chapter 15: Usage & Performance
: Everything has a cost. In this chapter, you'll 
learn about two important aspects of every application and in particular of every 
mobile application: cost and performance.
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Chapter 16: Introduction to Cloud Firestone
: You've already seen how to use a 
Firebase Realtime Database. In this chapter, you'll learn how to use another similar 
product which allows you to store and synchronize data from a mobile device into 
a NoSQL database: Cloud Firestore.
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Chapter 17: Managing Data with Cloud Firestore
: In this chapter, you'll learn 
how to set up an application into Cloud Firestore. Implementing the WhatsUp 
application, you'll learn how to create a DB using the Firebase console and how to 
set up the main configurations.
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Chapter 18: Reading Data from Cloud Firestore
: In this chapter, you'll continue 
working on the WhatsUp application and you'll focus on implementing reading 
logic. In the process, you'll learn how to read data from the Firestore, how to listen 
for updates in real-time, and how queries work.
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