Style circles categorically

package com.mapbox.maps.testapp.examples
 
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
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.dsl.generated.interpolate
import com.mapbox.maps.extension.style.expressions.dsl.generated.match
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
import com.mapbox.maps.testapp.R
 
/**
* 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.getMapboxMap()
mapboxMap.loadStyle(
style(Style.LIGHT) {
 
+vectorSource("ethnicity-source") {
url("http://api.mapbox.com/v4/examples.8fgz4egr.json?access_token=" + getString(R.string.mapbox_access_token))
}
 
+circleLayer("population", "ethnicity-source") {
sourceLayer("sf2010")
circleRadius(
interpolate {
exponential {
literal(1.75)
}
zoom()
stop {
literal(12)
literal(2)
}
stop {
literal(22)
literal(180)
}
}
)
 
circleColor(
match {
get {
literal("ethnicity")
}
literal("white")
rgb(251.0, 176.0, 59.0)
literal("Black")
rgb(34.0, 59.0, 83.0)
literal("Hispanic")
rgb(229.0, 94.0, 94.0)
literal("Asian")
rgb(59.0, 178.0, 208.0)
literal("Other")
rgb(204.0, 204.0, 204.0)
rgb(0.0, 0.0, 0.0)
}
)
}
}
)
 
mapboxMap.setCamera(
CameraOptions.Builder()
.center(Point.fromLngLat(-122.447303, 37.753574))
.zoom(12.0)
.build()
)
}
}