cdmunoz

@Singleton
@Component(
    modules = arrayOf(AndroidInjectionModule::class, BuildersModule::class, AppModule::class)
)
interface AppComponent {
  fun inject(app: Application)
}

cdmunoz

@Module
class AppModule(val app: Application){

  @Provides
  @Singleton
  fun provideApplication(): Application = app
}

cdmunoz

@Module
abstract class BuildersModule {

  @ContributesAndroidInjector
  abstract fun contributeCryptocurrenciesActivity(): CryptocurrenciesActivity
}

cdmunoz

class CryptocurrenciesActivity : AppCompatActivity() {

  override fun onCreate(savedInstanceState: Bundle?) {
    AndroidInjection.inject(this)
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    //...
  }
}

cdmunoz

dependencies {
    //android libs
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    implementation "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
    implementation "com.android.support.constraint:constraint-layout:${rootProject.ext.constraintLayoutVersion}"
    //moshi
    implementation "com.squareup.moshi:moshi-kotlin:${rootProject.ext.moshiKotlinVersion}"
    //dagger2
    implementation "com.google.dagger:dagger-android:${rootProject.ext.dagger2Version}"

cdmunoz

class CryptocurrencyApplication: Application(), HasActivityInjector {

  @Inject lateinit var activityInjector: DispatchingAndroidInjector<Activity>

  override fun onCreate() {
    super.onCreate()

    DaggerAppComponent.builder().appModule(AppModule(this)).build().inject(this)
  }

cdmunoz

dependencies {
    //android libs
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    implementation "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
    implementation "com.android.support.constraint:constraint-layout:${rootProject.ext.constraintLayoutVersion}"
    //moshi
    implementation "com.squareup.moshi:moshi-kotlin:${rootProject.ext.moshiKotlinVersion}"
    //dagger2
    implementation "com.google.dagger:dagger-android:${rootProject.ext.dagger2Version}"

cdmunoz

@Entity(
    tableName = "cryptocurrency"
)
data class Cryptocurrency(

    @Json(name = "id")
    @PrimaryKey
    val id: Int,

    @Json(name = "name")

cdmunoz

@Database(entities = arrayOf(Cryptocurrency::class), version = 1)
abstract class Database : RoomDatabase() {
  abstract fun cryptocurrenciesDao(): CryptocurrenciesDao
}

cdmunoz

@Dao
interface CryptocurrenciesDao {

  @Query("SELECT * FROM cryptocurrency")
  fun queryCryptocurrencies(): LiveData<List<Cryptocurrency>>

  @Insert(
      onConflict = OnConflictStrategy.REPLACE
  )
  fun insertCryptocurrency(cryptocurrency: Cryptocurrency)