Saving Data on Android

Using LiveData with a repository
To use 
LiveData
, you first need to learn what a 
LiveData
 is. To put it simply, 
LiveData
 is an 
observable piece of data
, which is 
aware of the Android lifecycle
. 
You could, for simplicity's sake, think of an 
Observable
 from Reactive Extensions, 
but which also listens to the Android lifecycle. As such, you can listen to its updates, 
by adding 
Observer
s.
Furthermore, by knowing the lifecycle state at all times, it has smart internal 
mechanisms, which stop potential observers from being updated, unless the lifecycle 
is 
active
 — your app and the screen with 
LiveData
s is visible. Because of this, you 
can easily avoid updating the UI, when the app is not active — e.g. when it's in the 
background.
Saving Data on Android Chapter 9: Using Room with Google's Architecture Components
raywenderlich.com
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According to the documentation, there are six main advantages of using 
LiveData
 vs 
other similar libraries:
•