Saving Data on Android

The Single 
Responsibility Principle
.
The Single Responsibility Principle states that each class in your code should have a 
single responsibility or a single reason to change and that it should do it well. Just 
like in a company, you wouldn't want developers doing accounting stuff and you 
wouldn't want your accountants touching your code.
Also, by having each class focusing on a single task you will make your code much 
easier to maintain and test.
All right, that's enough about 
LiveData
. Let's talk about 
ViewModel
s!
Crea/ng ViewModels
The 
ViewModel
 is a part of the 
Google's architecture components
 and it's designed 
to solve two common issues that developers often face when developing Android 
apps:
•
When an activity or fragment is destroyed, data is lost
:d Most developers can 
restore simple data by saving it using 
onSaveInstanceState()
 and retrieving it 
from the 
Bundle
 in 
onCreate()
. However, this is not always a good approach since 
Bundle
s are only suitable for small amounts of data that can be serialized and de-
serialized. You shouldn't store 
all the data
 you're displaying and working with.
•