Saving Data on Android

19
Chapter 19: Securing Data 
in Cloud Firestore
By Dean Djermanović
In the previous chapters, you implemented all of the features to the 
WhatsUp
 app 
except the most important one. You haven't implemented any security rules, which 
means anyone has access to your data.
In this chapter, you'll learn what security rules in Cloud Firestore are and how to add 
them to your database to make your data safe.
What are security rules?
To set up your own security system you'd need to set up your own server that acts as 
a proxy between your mobile clients and the remote database. That server would 
need to process all of the requests that are sent to the database and make sure that 
the client is accessing only the data that it is allowed to see.
Security rules handle security for you. You don't need to set up your own security 
system.