Saving Data on Android

Reading the user preferences
Currently, 
getNoteSortOrder()
 returns the default value of 
NoteSortOrder.FILENAME_ASC
. Replace the returned value with the following:
NoteSortOrder.valueOf( 
  sharedPrefs.getString(KEY_NOTE_SORT_PREFERENCE, 
DEFAULT_SORT_ORDER) 
      ?: DEFAULT_SORT_ORDER 
)
The above code uses 
getString()
 to retrieve the sort order the user stored, or 
FILENAME_ASC
 as the default value if the key 
KEY_NOTE_SORT_PREFERENCE
 does not 
exist.
Next, write the function to read the priority filters. Right now 
getNotePriorityFilters()
 returns an empty 
Set
. Replace 
setOf()
 with the 
following:
sharedPrefs.getStringSet(KEY_NOTE_PRIORITY_SET, 
setOf(DEFAULT_PRIORITY_FILTER)) 
      ?: setOf(DEFAULT_PRIORITY_FILTER)
The code above reads a 
Set
 of 
String
s from the prefs with the key 
KEY_NOTE_PRIORITY_SET
, and if nothing is found with that key, it will use a set with 
the priority of 
"1"
 inside, as the default.
Now that the functions to read and write the sort order and priority filters are 
written, you can use these functions in the 
MainActivity
.
Saving Data on Android
Chapter 2: Shared Preferences
raywenderlich.com
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