Saving Data on Android

Firebase Crashlytics
 collects, analyzes and organizes crash reports. It can also help 
you prioritize issues so that you can fix the most important ones first.
Saving Data on Android
Chapter 11: Firebase Overview
raywenderlich.com
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Your users will use your app in different circumstances — different devices, different 
networks and different locations. You need to provide the best user experience to all 
of them. To do that, you need metrics that tell you what’s happening during critical 
moments of your app’s use.
The only way to get that information is from the users themselves or by using