Saving Data on Android

Alt + Enter
 on 
Windows or 
Option + Enter
 on Mac.
As previously mentioned, 
LiveData
 is an observable wrapper around a piece of data. 
Because of this, you can hold anything within it, like a list, array or a list of lists of 
lists... you get the point!
So, to use 
LiveData
, you need to wrap the object that you want to observe for 
changes, which in this case are the results of 
getAllQuestions()
 and 
getQuestionsAndAllAnswers()
. Now, every time the data in Room changes, for 
example by adding a new 
Question
, your 
LiveData
 and its observers will be notified, 
with the new information. But, if you keep calling to the DAO, you'll always get a new 
LiveData
, and this defeats the purpose of Room being observable.
Additionally, you should never talk to the DAOs directly, because it's easier to modify 
the code for internal database communication if you wrap it around another layer of 
abstraction. For this reason. you will create a 
Repository
 that acts as a bridge 
between your DAOs and the 
ViewModel
s, which you will define later.
Saving Data on Android Chapter 9: Using Room with Google's Architecture Components
raywenderlich.com
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