Saving Data on Android

Implemen/ng query
The 
query
 function queries the database and returns the results. This function has 
been designed so that it can perform multiple types of queries, depending on the 
URI. Insert the code below into the body of the function:
var
 cursor : Cursor? = 
null
 
when
(sUriMatcher.match(uri)) { 
  URI_ALL_ITEMS_CODE -> { cursor = db.query(ALL_ITEMS)} 
  URI_ONE_ITEM_CODE -> { cursor = 
db.query(uri.lastPathSegment.toInt()) } 
  URI_COUNT_CODE -> { cursor = db.count()} 
  UriMatcher.NO_MATCH -> { 
/*error handling goes here*/
 } 
  
else
 -> { 
/*unexpected problem*/
 } 
} 
return
 cursor
Here you declare a cursor object and assign it to null. Based on the provided uri the 
URI matcher returns the corresponding code and the 
when
 statement calls the 
correct function on the database handler object to retrieve the results and assign 
them to the curser. The cursor is then returned.