Saving Data on Android

using-files
 and open 
projects
. Once there, open 
SimpleNote
 located inside 
starter
. Wait for the project to sync, download its 
dependencies and set up the workplace environment. When finished, run the app on 
a device or in the simulator. For now, you can ignore the warnings in the code.
This app has a simple user interface with two 
EditTexts
, one for the filename and 
one for a note. There are also three buttons along the bottom: 
READ
, 
WRITE
 and 
DELETE
. The user interface looks like this:
The SimpleNote App Interface
Saving Data on Android
Chapter 1: Using Files
raywenderlich.com
21

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The sample for this project includes three sub-packages: 
model
, 
ui
 and 
app
.
•
model
: This package includes a simple data class to represent a single note in 
Note.kt
. 
NoteRepository.kt
 contains the declaration of an interface with 
methods to add, get and delete a 
Note
. 
ExternalFileRepository
, 
InternalFileRepository
 and 
EncryptedFileRepository
 are classes that 
implement 
NoteRepository
 and override its methods. You’ll be adding code to 
these classes later.
•