Change icon size | Maps SDK | Android Docs

Change icon size with Symbol layer.
There are several ways to add markers, annotations, and other shapes to the map using the Maps SDK. To choose the appropriate approach for your application, read the Markers and annotations guide.
Kotlin
IconSizeChangeOnClickActivity.kt
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package com.mapbox.maps.testapp.examples.markersandcallouts

import android.animation.ValueAnimator
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.ContextCompat
import androidx.core.graphics.drawable.toBitmap
import com.mapbox.bindgen.Expected
import com.mapbox.geojson.Feature
import com.mapbox.geojson.FeatureCollection
import com.mapbox.geojson.Point
import com.mapbox.maps.*
import com.mapbox.maps.extension.style.image.image
import com.mapbox.maps.extension.style.layers.generated.SymbolLayer
import com.mapbox.maps.extension.style.layers.generated.symbolLayer
import com.mapbox.maps.extension.style.layers.getLayer
import com.mapbox.maps.extension.style.sources.generated.GeoJsonSource
import com.mapbox.maps.extension.style.sources.generated.geoJsonSource
import com.mapbox.maps.extension.style.sources.getSourceAs
import com.mapbox.maps.extension.style.style
import com.mapbox.maps.plugin.gestures.OnMapClickListener
import com.mapbox.maps.plugin.gestures.addOnMapClickListener
import com.mapbox.maps.plugin.gestures.removeOnMapClickListener
import com.mapbox.maps.testapp.R
import com.mapbox.maps.testapp.databinding.ActivityIconSizeChangeOnClickBinding

class IconSizeChangeOnClickActivity : AppCompatActivity(), OnMapClickListener {

  private lateinit var mapboxMap: MapboxMap
  private var markerSelected = false
  private var markerAnimator = ValueAnimator()

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val binding = ActivityIconSizeChangeOnClickBinding.inflate(layoutInflater)
    setContentView(binding.root)

    mapboxMap = binding.mapView.mapboxMap
    mapboxMap.loadStyle(
      styleExtension = style(Style.DARK) {
        +geoJsonSource("marker-source") {
          featureCollection(
            FeatureCollection.fromFeatures(markerCoordinates.map { Feature.fromGeometry(it) })
          )
        }
        // Add the marker image to map
        +image(
          "my-marker-image",
          ContextCompat.getDrawable(this@IconSizeChangeOnClickActivity, R.drawable.ic_blue_marker)!!.toBitmap()
        )
        // Adding an offset so that the bottom of the blue icon gets fixed to the coordinate, rather than the
        // middle of the icon being fixed to the coordinate point.
        +symbolLayer("marker-layer", "marker-source") {
          iconImage("my-marker-image")
          iconAllowOverlap(true)
          iconOffset(listOf(0.0, -9.0))
        }
        // Add the selected marker source and layer
        +geoJsonSource("selected-marker") {
          geometry(Point.fromLngLat(0.0, 0.0))
        }
        // Adding an offset so that the bottom of the blue icon gets fixed to the coordinate, rather than the
        // middle of the icon being fixed to the coordinate point.
        +symbolLayer("selected-marker-layer", "selected-marker") {
          iconImage("my-marker-image")
          iconAllowOverlap(true)
          iconOffset(listOf(0.0, -9.0))
        }
      }
    ) { mapboxMap.addOnMapClickListener(this@IconSizeChangeOnClickActivity) }
  }

  override fun onMapClick(point: Point): Boolean {
    mapboxMap.getStyle {
      val selectedMarkerSymbolLayer = it.getLayer("selected-marker-layer") as SymbolLayer
      val pixel = mapboxMap.pixelForCoordinate(point)
      mapboxMap.queryRenderedFeatures(
        RenderedQueryGeometry(screenBoxFromPixel(pixel)), RenderedQueryOptions(listOf("selected-marker-layer"), null)
      ) { expected: Expected<String, MutableList<QueriedRenderedFeature>> ->
        if (expected.value!!.isNotEmpty() && markerSelected) {
          return@queryRenderedFeatures
        }

        mapboxMap.queryRenderedFeatures(
          RenderedQueryGeometry(screenBoxFromPixel(pixel)), RenderedQueryOptions(listOf("marker-layer"), null)
        ) InnerRenderedQueryOptions@{ expectedFeatures ->
          val queriedFeatures = expectedFeatures.value!!
          if (queriedFeatures.isEmpty()) {
            if (markerSelected) {
              updateMarker(selectedMarkerSymbolLayer, false)
            }
            return@InnerRenderedQueryOptions
          }

          it.getSourceAs<GeoJsonSource>("selected-marker")!!.apply {
            queriedFeatures[0].queriedFeature.feature.geometry()?.let { value ->
              geometry(value)
            }
          }

          if (markerSelected) {
            updateMarker(selectedMarkerSymbolLayer, false)
          }
          if (queriedFeatures.isNotEmpty()) {
            updateMarker(selectedMarkerSymbolLayer, true)
          }
        }
      }
    }
    return true
  }

  private fun updateMarker(iconLayer: SymbolLayer, select: Boolean) {
    if (select) markerAnimator = ValueAnimator()
    markerAnimator.apply {
      if (select) {
        setFloatValues(1.0f, 2.0f)
      } else {
        setFloatValues(2.0f, 1.0f)
      }
      duration = 300
      addUpdateListener {
        iconLayer.iconSize((it.animatedValue as Float).toDouble())
      }
      start()
    }
    markerSelected = select
  }

  override fun onDestroy() {
    super.onDestroy()
    markerAnimator.cancel()
    mapboxMap.removeOnMapClickListener(this)
  }

  private fun screenBoxFromPixel(pixel: ScreenCoordinate) = ScreenBox(
    ScreenCoordinate(pixel.x - 25.0, pixel.y - 25.0),
    ScreenCoordinate(pixel.x + 25.0, pixel.y + 25.0)
  )

  companion object {
    private val markerCoordinates = arrayListOf<Point>(
      Point.fromLngLat(-71.065634, 42.354950), // Boston Common Park
      Point.fromLngLat(-71.097293, 42.346645), // Fenway Park
      Point.fromLngLat(-71.053694, 42.363725) // The Paul Revere House
    )
  }
}
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