Saving Data on Android

droidquiz
 — and name 
it 
QuizApplication
.
Saving Data on Android
Chapter 6: Entity Definitions
raywenderlich.com
115

---

Replace everything inside the 
QuizzApplication
 class with the following:
class
 
QuizApplication
 : 
Application
() { 
  
// 1
 
  
companion
 
object
 { 
    
lateinit
 
var
 database: QuizDatabase 
// 2
 
      
private
 
set
 
  } 
 
  
override
 
fun
 
onCreate
()
 { 
    
super
.onCreate() 
    database = Room 
        .databaseBuilder( 
            
this
, 
            QuizDatabase::
class
.
java
, 
            
"quiz_database"
 
        ) 
// 3
 
        .build() 
  } 
}
Taking each commented section in turn:
1. Makes this class extend 
Application
, so that it runs with the app launch.
2. Creates a private database property that will hold a reference to your Room 
database.
3. The 
databaseBuilder()
 method creates an instance of your Room database at 
runtime. The first parameter accepts a 
Context
 instance. The second parameter 
expects the class that you annotated as your Room database. The third parameter 
allows you to define a name for your SQLite database.
Now, add your 
QuizApplication
 class to your manifest file by adding the following 
attribute to your application tag inside your