Style circles categorically

package com.mapbox.maps.testapp.examples
 
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.mapbox.common.MapboxOptions
import com.mapbox.geojson.Point
import com.mapbox.maps.CameraOptions
import com.mapbox.maps.MapView
import com.mapbox.maps.MapboxMap
import com.mapbox.maps.Style
import com.mapbox.maps.extension.style.expressions.generated.Expression
import com.mapbox.maps.extension.style.expressions.generated.Expression.Companion.exponentialInterpolator
import com.mapbox.maps.extension.style.expressions.generated.Expression.Companion.literal
import com.mapbox.maps.extension.style.expressions.generated.Expression.Companion.match
import com.mapbox.maps.extension.style.expressions.generated.Expression.Companion.rgb
import com.mapbox.maps.extension.style.expressions.generated.Expression.Companion.zoom
import com.mapbox.maps.extension.style.layers.generated.circleLayer
import com.mapbox.maps.extension.style.sources.generated.vectorSource
import com.mapbox.maps.extension.style.style
 
/**
* Add point data to a style from a vector tileset and use the match and
* get expressions to assign the color of each point in a CircleLayer
* based on a data property.
*/
class StyleCirclesCategoricallyActivity : AppCompatActivity() {
 
private lateinit var mapboxMap: MapboxMap
 
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val mapView = MapView(this)
setContentView(mapView)
mapboxMap = mapView.mapboxMap
mapboxMap.loadStyle(
style(Style.LIGHT) {
 
+vectorSource("ethnicity-source") {
url("http://api.mapbox.com/v4/examples.8fgz4egr.json?access_token=" + MapboxOptions.accessToken)
}
 
+circleLayer("population", "ethnicity-source") {
sourceLayer("sf2010")
circleRadius(
exponentialInterpolator(
base = 1.75,
input = zoom(),
stops = arrayOf(
literal(12) to literal(2),
literal(22) to literal(180)
)
)
)
circleColor(
match(
input = Expression.get("ethnicity"),
stops = arrayOf(
literal("white") to rgb(251.0, 176.0, 59.0),
literal("Black") to rgb(34.0, 59.0, 83.0),
literal("Hispanic") to rgb(229.0, 94.0, 94.0),
literal("Asian") to rgb(59.0, 178.0, 208.0),
literal("Other") to rgb(204.0, 204.0, 204.0),
),
fallback = rgb(0.0, 0.0, 0.0)
)
)
}
}
)
 
mapboxMap.setCamera(
CameraOptions.Builder()
.center(Point.fromLngLat(-122.447303, 37.753574))
.zoom(12.0)
.build()
)
}
}