Saving Data on Android

10
Chapter 10: Migra/ons 
with Room
By Aldo Olivares
In the last chapter, you finally learned how to integrate your Room components with 
other architecture components like LiveData and ViewModel to make your app 
display a nice set of questions to your users.
But what happens if you want to modify your database schema to organize questions 
by category or difficulty?
Well, in this chapter you'll learn how Room helps you change your database schema 
in a predictable way by providing migrations that help you deal with your data.
Along the way you'll learn:
• How to create a migration.
• How to add a migration to your database.
• How to perform SQLite queries.
• How to fall back to a destructive migration.
Ready? It's time to get started.
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GeTng started
To begin, open the starter project, which you can find in this chapter's attachments. 
Then open the project in Android Studio 3.3 or greater by going to