Concepts / Building Search UI / Algolia Places
Aug. 23, 2019

Algolia Places

Using Places on Android

You can use Algolia Places on Android by using SearcherPlaces.

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Create a `RecyclerView.Adapter` and `ViewHolder` to display the results in a list:


```kotlin
class PlacesViewHolder(val view: View) : RecyclerView.ViewHolder(view) {

    fun bind(place: PlaceLanguage) {
        println(place.highlightResultOrNull)
        val name = place.highlightResultOrNull
            ?.toHighlights("locale_names")
            ?.firstOrNull()
            ?.tokenize() ?: place.localNames.first()
        val county = place.highlightResultOrNull
            ?.toHighlights("county")
            ?.firstOrNull()
            ?.tokenize() ?: place.county.first()
        val postCode = place.postCodeOrNull?.firstOrNull()?.let { ", $it" } ?: ""

        view.placeName.text = TextUtils.concat(name, ", ", county, postCode)
    }

    fun HighlightResult.tokenize(): SpannedString {
        return HighlightTokenizer()(value).toSpannedString()
    }
}

class PlacesAdapter : ListAdapter<PlaceLanguage, PlacesViewHolder>(PlacesAdapter), HitsView<PlaceLanguage> {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PlacesViewHolder {
        return PlacesViewHolder(parent.inflate(R.layout.place_item))
    }

    override fun onBindViewHolder(holder: PlacesViewHolder, position: Int) {
        val item = getItem(position)

        if (item != null) holder.bind(item)
    }

    override fun setHits(hits: List<PlaceLanguage>) {
        submitList(hits)
    }

    companion object : DiffUtil.ItemCallback<PlaceLanguage>() {

        override fun areItemsTheSame(oldItem: PlaceLanguage, newItem: PlaceLanguage): Boolean {
            return oldItem::class == newItem::class
        }

        override fun areContentsTheSame(oldItem: PlaceLanguage, newItem: PlaceLanguage): Boolean {
            return oldItem == newItem
        }
    }
}

Finally, create your activity with a SearchView and a RecyclerView to provide a search autocomplete experience:

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class PlacesActivity : AppCompatActivity() {

    val query = PlacesQuery(
        type = PlaceType.City,
        hitsPerPage = 10,
        aroundLatLngViaIP = false,
        countries = listOf(Country.France)
    )
    val searcher = SearcherPlaces(query = query, language = Language.English)
    val searchBox = SearchBoxConnector(searcher)
    val adapter = PlacesAdapter()
    val connection = ConnectionHandler(searchBox)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.places_activity)

        connection += searchBox.connectView(SearchBoxViewAppCompat(searchView))
        connection += searcher.connectHitsView(adapter) { hits -> hits.hits }

        placesList.let {
            it.itemAnimator = null
            it.adapter = adapter
            it.layoutManager = LinearLayoutManager(this)
            it.autoScrollToStart(adapter)
        }

        searcher.searchAsync()
    }

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

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