Saving Data on Android

read
 and 
write
 access.
4. Add 
google-service.json
 to both 
starter
 and 
final
 projects.
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Note
: If you need a reminder of how to do this, go back to "Chapter 11: 
Firebase Overview" and "Chapter 12: Introduction to Firebase Realtime 
Database."
Be sure to use the starter project from 
this chapter
, by opening the 
realtime-
database-offline-capabilities
 folder and its 
starter
 project from the 
projects
 
folder, rather than continuing with the final project you previously worked on. 
It has a few things added to it, including placeholders for the code to add in 
this chapter.
Enabling disk persistence
Before you start, build and run the 
starter
 project, located in the 
projects
 folder into 
realtime-database-offline-capabilities
. Make sure you device is connected to the 
internet. You'll see your posts on the home screen. Open any post. Now, disconnect 
your mobile device from the network and navigate back to the home screen. Your 
posts are still there. By default, Firebase stores your data 
in-memory
. Now, close the 
app and kill the app process from the 
Recent apps
 menu. Run your app again. Now, 
you'll see an empty screen.