malvinstn

@AnalyticsEvent
sealed class MyEvent {
  data class ShareImage(val imageName: String, val fullString: String) : MyEvent()
  object ButtonTapped : MyEvent()
}

malvinstn

apply plugin: 'kotlin'
apply plugin: 'kotlin-kapt'

dependencies {
  // Add dependency to your module that has the annotation class.
  compileOnly project(':annotation')
  implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"

  // To easily register your custom annotation processor to the annotation process flow.
  implementation "com.google.auto.service:auto-service:1.0-rc4"

malvinstn

// Set Target as class since we want this annotation to be added to a class element
@Target(AnnotationTarget.CLASS)
// Set retention as Source since we only need this annotation 
// during annotation processing process and
// we don't need this class at runtime.
@Retention(AnnotationRetention.SOURCE)
annotation class AnalyticsEvent

malvinstn

// Dummy analytics event tracker that logs the events to Logcat
object EventTracker {
  private const val TAG = "EventTracker"
  fun logEvent(name: String, params: Bundle) {
    Log.d(TAG, "Logging event name: $name; params: $params")
  }
}