Refinement List

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class MyActivity : AppCompatActivity() {

  val client = ClientSearch(ApplicationID("YourApplicationID"), APIKey("YourAPIKey"))
  val index = client.initIndex(IndexName("YourIndexName"))
  val searcher = SearcherSingleIndex(index)
  val facetList = FacetListConnector(
      searcher = searcher,
      filterState = FilterState(),
      attribute = Attribute("facetName"),
      selectionMode = SelectionMode.Multiple
  )
  val connection = ConnectionHandler(facetList)

  override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      // You can use the default `FacetListAdapter`, or implement your own UI component that implements the `FacetListView` interface.
      val facetListAdapter = FacetListAdapter(FacetListViewHolderImpl.Factory)
      connection += facetList.connectView(facetListAdapter)
      searcher.searchAsync()
  }

  override fun onDestroy() {
      super.onDestroy()
      connection.disconnect()
      searcher.cancel()
  }
}

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class MyActivity: AppCompatActivity() {
    val client = ClientSearch(
        ApplicationID("YourApplicationID"),
        APIKey("YourAPIKey")
    )
    val index = client.initIndex(IndexName("YourIndexName"))
    val searcher = SearcherSingleIndex(index)
    val filterState = FilterState()
    val attribute = Attribute("facetName")
    val viewModel = FacetListViewModel()
    val presenter = FacetListPresenterImpl(listOf(FacetSortCriterion.CountDescending), limit = 5)
    val connection = ConnectionHandler()

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

        // You can use the default FacetListAdapter, or implement your own UI component that fulfill the FacetListView interface.
        val view: FacetListView = FacetListAdapter(MyFacetListViewHolder.Factory)

        connection += searcher.connectFilterState(filterState)
        connection += viewModel.connectFilterState(filterState, attribute, FilterOperator.Or)
        connection += viewModel.connectSearcher(searcher, attribute)
        connection += viewModel.connectView(view, presenter)

        searcher.searchAsync()
    }

    override fun onDestroy() {
        super.onDestroy()
        connection.disconnect()
        searcher.cancel()
    }
}