class LocalService : Service() {

  private val binder = LocalBinder()
  private val generator = Random()

  val randomNumber: Int
    get() = generator.nextInt(100)

  inner class LocalBinder : Binder() {
    fun getService(): LocalService = this@LocalService
  }

  override fun onBind(intent: Intent): IBinder {
    return binder
  }

  override fun onDestroy() {
    super.onDestroy()
    LeakSentry.refWatcher.watch(this) // Only modification is to add LeakCanary
  }
}

class MainActivity: Activity() {

  private var service: LocalService? = null
  private val serviceConnection = object: ServiceConnection {
    override fun onServiceConnected(name: ComponentName?, binder: IBinder?) {
      service = (binder as LocalBinder).getService()
    }
    override fun onServiceDisconnected(name: ComponentName?) {
      service = null
    }
  }

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    bindService(Intent(this, LocalService::class.java), serviceConnection, BIND_AUTO_START)
  }

  override fun onDestroy() {
    service?.let {
      unbindService(serviceConnection)
      service = null
    }
    super.onDestroy()
  }
}

┬
├─ com.example.serviceleak.LocalService$LocalBinder
│    Leaking: NO (it's a GC root)
│    ↓ LocalService$LocalBinder.this$0
│                               ~~~~~~
╰→ com.example.serviceleak.LocalService
​     Leaking: YES (RefWatcher was watching this)