mantisbayne

@Injectable(ExampleModules::class)
class ExampleActivity : FragmentActivity() {
  
  // Assuming you have set up your Presenter or another class that uses ViewModel (if using MVVM)
  // This example uses MVP, but MVVM only requires a few more steps
  val presenter: ExampleViewModel by viewModel()
  
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_quotes)

mantisbayne

class ExampleRepository(private val exampleDao: ExampleDao) : IExampleRepository {
  
  override fun getAll(): Observable<List<Example>> = exampleDao.getAll()
}

mantisbayne

interface IExampleRepository {
  
  fun getAll(): Observable<List<Example>>
}

mantisbayne

@Database(entities = ExampleEntity::class, version = 1, exportSchema = false)
@TypeConverters(Converters::class)
abstract class AppDatabase : RoomDatabase() {
    abstract fun exampleDao(): ExampleDao

    companion object {

        // For Singleton instantiation
        @Volatile private var instance: AppDatabase? = null

mantisbayne

@Dao
interface ExampleDao {
    @Query("SELECT * FROM examples")
    fun getExamples(): LiveData<List<Example>>

    @Query("SELECT * FROM examples WHERE id = :id)")
    fun getExampleById(id: String): LiveData<Example>
}

mantisbayne

@Entity(tableName = "example")
data class ExampleEntity(
  @PrimaryKey
  val id: String,
  val exampleName: String,
  val exampleAge: Int,
  val exampleDate: Date
)

mantisbayne

val myModule = module {
  // singleton
  single { DataRepository() }
  
  // factory for ExampleUseCase, use get() to resolve the constructor
  factory { ExampleUseCase(get()) }

  // Define a singleton of type HttpClient ("properties_url" is in Koin properties)
  single { HttpClient(getProperty("properties_url")) }
  

mantisbayne

class DataRepository()
class ExampleUseCase(val repository : Repository)
class ExampleViewModel(val repository : Repository)
class HttpClient(val url : String)

mantisbayne

class ExampleApplication : Application() {

    override fun onCreate() {
        super.onCreate()

        startKoin {
            androidLogger()
            androidContext(this@ExampleApplication)
            modules(appModule)
        }

mantisbayne

// Koin for Android
compile "org.koin:koin-android:$koin_version"

// Koin Android Scope feature
compile "org.koin:koin-android-scope:$koin_version"

// Koin Android ViewModel feature
compile "org.koin:koin-android-viewmodel:$koin_version"