Saving Data on Android

Improving app quality
Firebase can help you improve the quality of your apps.
Before pushing your app to production, you need to test it. For that, Firebase 
provides you with 
Test Lab
.
With so many different devices out there, you need to ensure that every feature of 
your app works as expected regardless of screen size or operating system version. 
Testing on every device is challenging since most developers don’t have access to all 
available device. Firebase Test Lab makes it possible to test your app with a variety of 
physical devices hosted in the cloud.
Bugs are frustrating for users and can cause them to uninstall the app and negatively 
impact its success. Many things can go wrong in the app and cause it to crash.