Saving Data on Android

Note
: Here you are using a method in your 
ViewModel
 to prepopulate your 
database since it is very useful to learn how to perform delete and insert 
operations at any time. However, if you want to prepopulate your database 
with some default data, most of the time you will probably use 
addCallback()
 
on your database builder, which gives you a callback, for when the database is 
ready. Then, within the callback you can call your prepopulated code.
Saving Data on Android Chapter 9: Using Room with Google's Architecture Components
raywenderlich.com
156

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The 
ViewModel
 for your 
MainActivity
 is ready! Now, it is time to create the 
ViewModel
 for your 
QuestionActivity
.
Next, you need to create the 
ViewModel
 for your 
QuestionActivity
, This will be 
slightly more complex, but don't worry, you'll be guided every step of the way.
The 
QuestionActivity
 can have three different states at any given point:
•