Saving Data on Android

Modifying the adapter
To test the content provider you just created, open 
ToDoAdapter.kt
 and add the 
following code inside the class before the 
onCreateViewHolder
 method:
  
private
 
val
 queryUri = CONTENT_URI.toString() 
// base uri
 
  
private
 
val
 queryCountUri = ROW_COUNT_URI.toString() 
  
private
 
val
 projection = arrayOf(CONTENT_PATH) 
//table
 
  
private
 
var
 selectionClause: String? = 
null
 
  
private
 
var
 selectionArgs: Array? = 
null
 
  
private
 
val
 sortOrder = 
"ASC"
Saving Data on Android
Chapter 4: ContentProvider
raywenderlich.com
83

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These declarations provide the parameters you will need to pass to the 
contentResolver
 methods to query, update, insert and delete from the database. 
Next you will utilize the content provider by calling the content resolver's functions.
The adapter needs to know how many rows there are to properly configure the 
recyclerview. Locate 
getItemCount
 and insert the code below into the body of the 
function, directly above the 
return
 statement:
// Get the number of records from the Content Resolver
 
val
 cursor = 
context.contentResolver.query(Uri.parse(queryCountUri), 
  projection, selectionClause, 
  selectionArgs,sortOrder) 
// Return the count of records
 
if
(cursor != 
null
) { 
  
if
(cursor.moveToFirst()) { 
    
return
 cursor.getInt(
0
) 
  } 
}
The query above utilizes the query string