Saving Data on Android

db
 package and name it 
migrations
.
Inside 
migrations
, create a new class and name it 
Migration1To2
. Make your class 
extend 
Migration
 like this:
class
 
Migration1To2
 : 
Migration
(1, 2) { 
}
The first parameter in the constructor represents the start version of the database. 
The second one represents the end version after you've applied this migration.
Next, press 
Control + I
 (
implement methods
) so Android Studio displays all missing 
members. Select all of them and press 
OK
. Your class should now have a 
migrate()
 
method:
class
 
Migration1To2
 : 
Migration
(
1
, 
2
) { 
  
override
 
fun
 
migrate
(database: SupportSQLiteDatabase)
 { 
    TODO(
"not implemented"
) 
//To change body of created 
functions use File | Settings | File Templates.
 
  } 
}
Inside 
migrate()
, you should execute all the queries you need to properly change 
the database schema to the version indicated in the constructor.
Now, since the change is a very simple one, you'll only need to execute a single