Начало

Выбор DI

Есть два стула

Lightsaber

@Component
private class MainComponent {
  @Provides
  private fun provideMainModule() = MainModule()

  @Module
  private class MainModule {
    @Provides
    private fun provideMainRepository(impl: MainRepositoryImpl): MainRepository = impl
  }
}
					

class MainActivity : BaseActivity() {
  @Inject private val repository: MainRepository = notNull()

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val injector = lightsaber.createInjector(MainComponent())
    injector.injectMembers(this)
  }
}
					

ASM

Transform API

kapt

Kotlin ❤️ APT

class MainActivity : BaseActivity() {
  @Bind(R.id.label) private val label: TextView = notNull()

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.main_activity)
    Sento.bind(this, this)
  }

  @OnTextChanged(R.id.input)
  private fun onInputChanged(text: CharSequence) {
    label.text = getValidationMessage(text)
  }
}
					

protected static Drawable getDrawableFromResource(View view, int resourceId) {
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
    return view.getContext().getDrawable(resourceId);
  } else {
    return view.getResources().getDrawable(resourceId);
  }
}
					

protected static Drawable getDrawableFromResource(View view, int resourceId) {
  return AppCompatResources.getDrawable(view.getContext(), resourceId));
}
					

sealed class Selection : AutoParcelable {
  data class Item(val id: String) : Selection()
  object None : Selection()
}
					

grip select methods from inputs where
  (isConstructor() and annotatedWith(Types.INJECT_TYPE))
					

или

grip
  .select(methods)
  .from(inputs)
  .where(isConstructor() and annotatedWith(Types.INJECT_TYPE))
					

@Obfuscate
object TopSecretStrings {
  const val TOP_SECRET_STRING = "42"
}
					

kapt2

(спешит на помощь)

kapt3

Как kapt1, но лучше

Colonist

Colonist

@Colony
@SelectSettlersBySuperType(Feature::class)
@ProduceSettlersAsClasses
@AcceptSettlersViaCallback
annotation class FeatureColony
					

class MyFeature : Feature { /* ... */ }

@FeatureColony
private class FeatureManager {
  init {
    Colonist.settle(this)
  }

  @OnAcceptSettler(colonyAnnotation = FeatureColony::class)
  fun onAcceptFeature(featureClass: Class<out Feature>) {
    // ...
  }
}
					

• В коде используются *Binding
• *Binding.java генерируются до компиляции
• *BindingImpl.java генерируются APT

  А также BR и DataBindingComponent

Планы

Полезные ссылки

• ASM
  https://asm.ow2.io
• Transform API
  http://google.github.io/android-gradle-dsl/javadoc/current
• kapt: Annotation Processing for Kotlin
  https://blog.jetbrains.com/kotlin/2015/05/kapt-annotation-processing-for-kotlin
• Implement Annotation Processing API (JSR 269) natively in Kotlin
  https://youtrack.jetbrains.com/issue/KT-13499
• Pushing the limits of Kotlin annotation processing
  https://medium.com/@workingkills/pushing-the-limits-of-kotlin-annotation-processing-8611027b6711

Не очень полезные ссылки

• Презентация — https://michaelrocks.github.io/codegen-without-kapt
• Lightsaber — https://github.com/MichaelRocks/lightsaber
• Sento — https://github.com/nsk-mironov/sento
• Smuggler — https://github.com/joomcode/smuggler
• DataBindingCompat — https://github.com/MichaelRocks/DataBindingCompat
• Grip — https://github.com/MichaelRocks/grip
• Paranoid — https://github.com/MichaelRocks/paranoid
• Colonist — https://github.com/MichaelRocks/colonist
• kapt bugs — https://github.com/nsk-mironov/kotlin-kapt-bugs/branches/all

Спасибо за внимание!