Saving Data on Android

ToDoDbSchema
 or the new 
ToDoContract
, choose 
ToDoContract
. The goal is to have the content provider depending on the 
contract so that it serves as an abstract layer above the database handler. This 
design allows for the data source to be swapped out as long as it meets the 
same specifications as the previous data source, and no other code that is 
dependent on the database will be affected, in this app or other apps that 
utilize the contract.
Open up the file you just created in the 
provider
 package called 
ToDoContentProvider.kt
. There are six 
TODO
 tags, one for each method that is 
required to implement. Notice how the class inherits from the 
ContentProvider
 
class in the Android SDK. Before implementing the methods, add the following 
declarations inside the class above all the overridden method stubs:
  
// 1
 
  
// This is the content provider that will
 
  
// provide access to the database
 
  
private
 
lateinit
 
var
 db : ToDoDatabaseHandler 
  
private
 
lateinit
 
var
 sUriMatcher : UriMatcher 
 
  
// 2
 
  
// Add the URI's that can be matched on
 
  
// this content provider
 
  
private
 
fun
 
initializeUriMatching
()
 { 
 
    sUriMatcher = UriMatcher(UriMatcher.NO_MATCH) 
    sUriMatcher.addURI(AUTHORITY,CONTENT_PATH, 
URI_ALL_ITEMS_CODE) 
    sUriMatcher.addURI(AUTHORITY, CONTENT_PATH + 
"/#"
, 
URI_ONE_ITEM_CODE) 
    sUriMatcher.addURI(AUTHORITY, CONTENT_PATH + 
"/"
 + COUNT, 
Saving Data on Android
Chapter 4: ContentProvider
raywenderlich.com
81

---

                       URI_COUNT_CODE) 
  } 
 
  
// 3
 
  
// The URI Codes
 
  
private
 
val
 URI_ALL_ITEMS_CODE = 
10
 
  
private
 
val
 URI_ONE_ITEM_CODE = 
20
 
  
private
 
val
 URI_COUNT_CODE = 
30
1. Add an instance of the database handler as the content provider sits between the 
database and the rest of the program, also create a URI matcher to help construct 
the URI strings.
2. Create a function called