Saving Data on Android

Crea/ng the database constants using a 
contract class
In the 
Model
, create a new file and name it 
TodoDbSchema.kt
. Place the following 
code into the file:
object
 ToDoDbSchema { 
  
// 1
 
  const 
val
 DATABASE_VERSION = 
1
 
  
// 2
 
  const 
val
 DATABASE_NAME = 
"todoitems.db"
 
  
object
 ToDoTable { 
    
// 3
 
    const 
val
 TABLE_NAME = 
"todoitems"
 
    
object
 Columns { 
      
// 4
 
      const 
val
 KEY_TODO_ID = 
"todoid"
  
      
// 5
 
      const 
val
 KEY_TODO_NAME = 
"todoname"
  
      
// 6
 
      const 
val
 KEY_TODO_IS_COMPLETED = 
"iscompleted"
  
    } 
  } 
}
Here's what each part is:
1. The version of the database. Manually increment this number each time the 
database version is new, and you need to use the version to add 
update
 or 
migration logic
.
2. The name of the database as it will be stored in the app-specific database folder 
on the device.
3. The name of the table will use to store the TODO items.
4. The column that contains the 
unique primary key
 for each TODO item.
5. The column that contains the text of the TODO item.
6. The column that will store a value that will be used to indicate whether or not 
you completed a TODO item.
Now, it's time to create your own database!
Saving Data on Android
Chapter 3: SQLite Database
raywenderlich.com
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