Data-driven styling
Use the Maps SDK's data-driven styling capabilities to create and display many types of data. You can dynamically change the look and feel of your map in real time based on the information within a particular dataset. Data-driven styling is largely built on the idea of sources and layers.
View a full list of the features in runtime styling not specific to Android.
Sources and layers provide nimble options for customizing the look of a Mapbox map and the data displayed on the map. The Mapbox Annotation Plugin for Android provides a simplified system for interacting with and customizing Mapbox map layers.
Sources
Sources hold the actual data and layers reference sources. That is how to show data on your Mapbox map. There are a handful of different source types supported and choosing the correct one to use depends on your data type. Adding a source won't instantly make data appear on the map because sources don't contain styling details like color or width. Layers refer to a source and give it a visual representation.
Two parameters are required to use a source. A source requires a unique String
ID and requires some sort of data.
Vector
VectorSource
tiles must be in Mapbox Vector Tile format. All layers that use a vector source must specify a "source-layer" value. For vector tiles hosted by Mapbox, the URL value should be of the form mapbox://mapid
.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { // Adding a vector source layer VectorSource vectorSource = new VectorSource("vector-source", "YOUR_TILESET_ID"); style.addSource(vectorSource); }});
When adding a new layer to a map style at runtime using a VectorSource
, you must specify a source layer using the setSourceLayer()
method (even when a tileset contains only one source layer). To see the available source layers in a tileset, visit your Mapbox account's Tilesets page and click on the tileset to open the tileset information page, which lists all source layers. Identify which source layer's data you want to be attributed to the map's layer.
This setSourceLayer()
method is prohibited for all other source types including GeoJSON sources.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { VectorSource vectorSource = new VectorSource("vector-source", "tileset-id"); style.addSource(vectorSource); CircleLayer circleLayer = new CircleLayer("circle-layer-id", "vector-source"); circleLayer.setSourceLayer(NAME_OF_LAYER_INSIDE_TILESET); style.addLayer(circleLayer); }});
Raster
RasterSource
tiles can be added to your map if they are in TileJSON format. If hosted by Mapbox, the URL value should be of the form mapbox://mapid
.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { // Adding a raster source layer RasterSource rasterSource = new RasterSource("raster-source", "mapbox://mapbox.u8yyzaor"); style.addSource(rasterSource); }});
GeoJson
Adding a GeoJsonSource
can be done in a few different ways. You can provide a URL to the GeoJSON raw data hosted online, provide a link to a GeoJSON file hosted locally inside of the app's assets folder, or you can build your own GeoJSON FeatureCollection
directly inside of the code. The snippets of code below show the different ways to add a GeoJSON source to your map.
Create a GeoJSON feature collection dynamically and then add it as a map source.
Add a GeoJSON source from a URL:
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { try { URI geoJsonUrl = new URI("https://url-to-geojson-file.geojson"); GeoJsonSource geoJsonSource = new GeoJsonSource("geojson-source", geoJsonUrl); style.addSource(geoJsonSource); } catch (URISyntaxException exception) { Log.d(TAG, exception); }}});
You can also load a locally stored GeoJSON file by using a URI
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { try { GeoJsonSource source = new GeoJsonSource("geojson-source", new URI("asset://local_file_name.geojson")); style.addSource(source); } catch (URISyntaxException exception) { Log.d(TAG, exception); }}});
Create a GeoJSON FeatureCollection
and add it to your map:
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { // Create a list to store our line coordinates. List routeCoordinates = new ArrayList<Point>(); routeCoordinates.add(Point.fromLngLat(-118.394391, 33.397676)); routeCoordinates.add(Point.fromLngLat(-118.370917, 33.391142)); // Create the LineString from the list of coordinates and then make a GeoJSON FeatureCollection so that you can add the line to our map as a layer. LineString lineString = LineString.fromLngLats(routeCoordinates); FeatureCollection featureCollection = FeatureCollection.fromFeature(Feature.fromGeometry(lineString)); GeoJsonSource geoJsonSource = new GeoJsonSource("geojson-source", featureCollection); style.addSource(geoJsonSource);}});
Read an explanation and view the code for using runtime styling to change a map's water color.
A benefit of having your data inside a GeoJSON source is that you can update, remove, or add additional Feature
s inside the source at any time, providing a solution to animating data in your map through the Runtime Styling API. For example, an Android ValueAnimator
can move a feature by updating its coordinates within the GeoJSON data.
Image
ImageSource
allows for a georeferenced raster image to be shown on top of the map. The georeferenced image scales and rotates as the user zooms, tilts, and rotates the map. The geographic location of the raster image content, supplied with LatLngQuad
, can be non-axis aligned.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { // Set the latitude and longitude coordinates of the image's four cornersLatLngQuad quad = new LatLngQuad(new LatLng(46.437, -80.425),new LatLng(46.437, -71.516),new LatLng(37.936, -71.516),new LatLng(37.936, -80.425)); // Add the source to the map layerstyle.addSource(new ImageSource(ID_IMAGE_SOURCE_ID, quad, DRAWABLE_IMAGE)); // Add layerRasterLayer layer = new RasterLayer(ID_IMAGE_LAYER, IMAGE_SOURCE_ID);style.addLayer(layer); }});
The setImage()
method is a convenient way to update the ImageSource
's image by passing in a drawable.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { ImageSource imageSource = style.getSourceAs(ID_IMAGE_SOURCE); if (imageSource != null) { imageSource.setImage(DESIRED_IMAGE); }}});
Custom geometry
A CustomGeometrySource
is helpful in situations when you have data which is dynamically generated or needs to be loaded on demand. A FeatureCollection
with any type and number of GeoJSON geometries can be used in a CustomGeometrySource
.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { CustomGeometrySource customSource = new CustomGeometrySource(CUSTOM_SOURCE_ID,GeometryTileProvider);if (customSource != null){ style.addSource(customSource);}}});
One example of CustomGeometrySource
usage is to create a black grid on top of the map. This example's code can be found in the GridSourceActivity
of the Maps SDK for Android test application.
Raster DEM
RasterDemSource
supports Mapbox Terrain RGB (mapbox://mapbox.terrain-rgb
) and Mapzen Terrarium tile formats. This source should be used with a Maps SDK HillshadeLayer
.
The Mapbox terrain tileset is for adding hill terrain to any Mapbox map. Runtime styling can also be used to change the hillshade appearance.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { RasterDemSource rasterDemSource = new RasterDemSource("source-id", "mapbox://mapbox.terrain-rgb"); style.addSource(rasterDemSource); // Create hillshade layer source to map HillshadeLayer hillshadeLayer = new HillshadeLayer("hillshade-layer-id", "source-id").withProperties( hillshadeHighlightColor(Color.parseColor(HILLSHADE_HIGHLIGHT_COLOR)), hillshadeShadowColor(Color.BLACK) ); // Add hillshade layer to map style.addLayer(hillshadeLayer); }});
Layers
While sources hold the data, layers are used to style and display the information. Several layer types are offered depending on your source geometry. Except for layers of the background type, each layer needs to refer to a source. You can optionally filter features and then define how those features are styled.
Each layer offers a setProperties
API which can be used to style the layer in many different ways. Note that instead of creating different layers depending on certain cases inside your source data, it's recommended to use data-driven styling to reduce the number of layers that the map needs to render.
Background
The background layer type is unique in that it doesn't require a source. Background layers can be a solid color or a pattern.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { BackgroundLayer backgroundLayer = new BackgroundLayer("background-layer");backgroundLayer.setProperties(PropertyFactory.backgroundColor(Color.BLUE)); // Add background layer to mapstyle.addLayer(backgroundLayer); }});
Fill
Fill layers have an enclosed shape geometry that can be useful for marking areas on a map. Use a FillLayer
with GeoJSON Polygon
or MultiPolygon
geometries. The geometry is like a line layer consisting of a series of coordinates in a particular order with the first and last points having the same coordinate. The geometry is "enclosed" when the coordinate list starts and ends with the same coordinates. If the geometry isn't enclosed, the FillLayer
will render but some vertices and sides might be cut off by the tile boundaries.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { FillLayer fillLayer = new FillLayer("layer-id", "source-id");fillLayer.setProperties(PropertyFactory.fillColor(Color.GREEN)); // Add fill layer to mapstyle.addLayer(fillLayer); }});
To alter the shape of the geometry once you have added it, the layer can stay with no changes needed, only the source it's using should be updated. The layer will always display the latest updates inside its source.
Line
Build a GeoJSON FeatureCollection with the line geometry and then display it on the map using a line layer.
A series of coordinates can be combined to create a line segment that shows on a map. Between each pair of coordinates, a line segment's created which gets drawn straight and connects the two points.
Before beginning, you'll want to make sure that the Source your layer will be using has lineStrings as part of its geometry and you can find an example of this in the GeoJSON source section. Once the source has been created and added to the map, a lineLayer
can be started, and properties can be set.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { LineLayer lineLayer = new LineLayer("line-layer", "line-source"); // The layer properties for our line. This is where you can make the line dotted, set the color, etc. lineLayer.setProperties( PropertyFactory.lineDasharray(new Float[]{0.01f, 2f}), PropertyFactory.lineCap(Property.LINE_CAP_ROUND), PropertyFactory.lineJoin(Property.LINE_JOIN_ROUND), PropertyFactory.lineWidth(5f), PropertyFactory.lineColor(Color.parseColor("#e55e5e")) ); style.addLayer(lineLayer);}});
Symbol
Symbol layers show a single location on the map with either an icon or text label. Like GL Markers and Marker Views, the symbol layer can represent the same data and offers the most power for in map displaying. To begin with, you will add a marker image to the map and then display it as a symbol layer.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { Bitmap icon = BitmapUtils.getBitmapFromDrawable(getResources().getDrawable(R.drawable.red_marker));style.addImage("icon-id", icon); SymbolLayer symbolLayer = new SymbolLayer("layer-id", "source-id"); symbolLayer.setProperties(PropertyFactory.iconImage("icon-id"); style.addLayer(symbolLayer); }});
Not only can symbol layers mark locations on the map using an image, but they can also display text directly on the map. The SDK handles text symbol layers in a similar process to the image snippet given above, only the properties of the layer change.
Icon anchors and offsets
By default a SymbolLayer
icon is anchored to the coordinate at the icon's center. While this is appropriate for many icons, it may not be appropriate for icons shaped like teardrop markers or pushpins, when you would expect the bottom of the icon to be anchored to the coordinate. In these cases, you can adjust the position of the icon by specifying an anchor or setting an offset.
If you are using the mapbox_marker_icon_default
image included with the Mapbox Maps SDK for Android, you do not need to adjust the icon anchor. The image includes bottom spacing that's equal to half the pin height, so the point will align with the coordinate.
Anchor: Using PropertyFactory.iconAnchor
is the recommended way to adjust the icon's location. For example, using PropertyFactory.iconAnchor(Property.ICON_ANCHOR_BOTTOM)
tells the Maps SDK to attach the image's bottom to the coordinate.
Offset: PropertyFactory.iconOffset
is alternative solution that allows you to specify the distance that you'd like the icon to be moved from the anchor point. For example, using PropertyFactory.iconOffset(new Float[] {0f, VERTICAL_FLOAT_VALUE})
, where VERTICAL_FLOAT_VALUE
is some distance, tells the Maps SDK to move the icon that distance (up or down) from the coordinate. The appropriate VERTICAL_FLOAT_VALUE
will depend on the height of your icon.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { SymbolLayer symbolLayer = new SymbolLayer("SYMBOL_LAYER_ID", "SYMBOL_LAYER_SOURCE_ID"); symbolLayer.setProperties( iconImage("SYMBOL_LAYER_ICON_ID"), iconAnchor(Property.ICON_ANCHOR_BOTTOM), // or iconOffset(new Float[] {0f, -9f})); style.addLayer(symbolLayer); }});
Raster
Raster layers are typically a collection of images that display on top of the base map tiles. While vector tiles are preferred, satellite imagery or legacy map styles render as a raster layer.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { RasterSource rasterSource = new RasterSource("source-id", "mapbox://mapbox.u8yyzaor"); style.addSource(rasterSource); RasterLayer rasterLayer = new RasterLayer("layer-id", "source-id"); style.addLayer(rasterLayer); }});
One common use case for a RasterLayer
is adding a layer of satellite tiles to the map:
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { // Adding a raster source layer RasterSource satelliteRasterSource = new RasterSource("satellite-raster-source", "mapbox://mapbox.satellite",512); style.addSource(satelliteRasterSource); }});
Circle
Circle layers have a single center coordinate which comes from the source data. It's a geographically accurate projection of a circle on the Earth's surface drawn on the map. A few default properties are provided but can be overridden when the layer's first created.
mapboxMap.getStyle(new Style.OnStyleLoaded() { @Override public void onStyleLoaded(@NonNull Style style) { CircleLayer circleLayer = new CircleLayer("layer-id", "source-id"); circleLayer.setProperties( PropertyFactory.circleRadius(FLOAT_OR_EXPRESSION), PropertyFactory.circleColor(COLOR_OR_EXPRESSION) ); style.addLayer(circleLayer); }});
Fill extrusion
Fill extrusion layers add 3D polygon "extrusions" to the map. This layer is often used to show 3D buildings, but any type of Polygon
shape can be extruded with this layer type. Find more information on styling 3D shape extrusions in the Extrusions guide.
mapboxMap.getStyle(new Style.OnStyleLoaded() { @Override public void onStyleLoaded(@NonNull Style style) { FillExtrusionLayer fillExtrusionLayer = new FillExtrusionLayer("extrusion-layer-id", "source-id"); fillExtrusionLayer.setProperties( fillExtrusionHeight(HEIGHT_NUMBER) ); style.addLayer(fillExtrusionLayer); }});
Hillshade
A HillshadeLayer
displays elevation data that comes from Mapbox Terrain RGB tile formats. This layer should be used with a RasterDemSource
.
Read more information on accessing elevation data in the Access elevation data guide.
The hillshade section of the official Mapbox Style Specification has information on styling the hillshading's shadow color, light direction, and more.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { RasterDemSource rasterDemSource = new RasterDemSource("source-id", "mapbox://mapbox.terrain-rgb"); style.addSource(rasterDemSource); HillshadeLayer hillshadeLayer = new HillshadeLayer("hillshade-layer-id", "source-id").withProperties( hillshadeHighlightColor(Color.parseColor(HILLSHADE_HIGHLIGHT_COLOR)), hillshadeShadowColor(Color.BLACK) ); style.addLayer(hillshadeLayer); }});
Add and style terrain hillshading.
Heatmap
The Maps SDK's HeatmapLayer
provides heatmap visualizations and styling options for peformant heatmaps. The two main categories for using this layer are:
- Dense
Point
data. Heatmaps are a useful way to visualize the density of a particular phenomenon when it would be visually overwhelming to display each point individually. - Interpolating discrete values over a continuous surface, creating a smooth gradient between those points. This type of heatmap is less common and does not visualize density by aggregating features within a set of boundaries in the way a choropleth map does, but instead displays a continuous gradient between points. For example, your town may only have a few weather stations, but your favorite weather app displays a smooth gradient of temperatures across the entire area of your town. For your local weather service, it is reasonable to assume that, if two adjacent stations report different temperatures, the temperature between them will transition gradually from one to the next. Read the heatmap section in Mapbox's style specification to learn more about the radius, weight, intensity, color, and opacity options for heatmaps.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { HeatmapLayer heatmapLayer = new HeatmapLayer("layer-id", "source-id"); heatmapLayer.setProperties( PropertyFactory.heatmapColor(COLOR_OR_EXPRESSION), PropertyFactory.heatmapWeight(FLOAT_OR_EXPRESSION) ); style.addLayer(heatmapLayer); }});
Use a HeatmapLayer to visualize data
Use expressions to style the HeatmapLayer with precise control
Removing sources and layers
A source cannot be removed if it's still used by any layer. The removal will fail and log a console warning. Starting in the 7.0.0
release of the Maps SDK, the SDK changed remove
methods to return a boolean
which states whether the removal was successful.
All layers using a particular source must be removed before that source can be removed.
Removing a layer:
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { style.removeLayer("layer-id"); }});
Removing a source:
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { style.removeSource("source-id"); }});
Modify properties
Sources and layers aren't immutable so they can be modified anytime during the map render. For example, to alter the fill color of a layer after it's been added to the map, you use the map's Style
object to get the layer and set the property.
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { FillLayer fillLayer = style.getLayerAs("fill-layer-id"); if (fillLayer != null) { fillLayer.setProperties(PropertyFactory.fillColor(Color.GREEN)); } }});
In a GeoJSON source, you are able to change, add, remove, or replace the FeatureCollection. You can pass in a List
of Feature
s, a single Feature
, or a Geometry
:
mapboxMap.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) { GeoJsonSource geoJsonSource = style.getSourceAs("geojson-source-id"); FeatureCollection newFeatureCollectionFromFeatureList = FeatureCollection.fromFeatures(FEATURE_LIST); Feature newFeature = Feature.fromGeometry(Point.fromLngLat(0.0, 0.0)); LineString newLineString = LineString.fromLngLats(POINT_LIST); if (geoJsonSource != null) { geoJsonSource.setGeoJson(newFeatureCollectionFromFeatureList); // or geoJsonSource.setGeoJson(newFeature); // or geoJsonSource.setGeoJson(newLineString); }});
Capturing click events
Layers are not clickable and don't expose any event listeners for you to handle user input. Instead, the map querying tools can help you detect when a user has interacted with the map. For example, when a FillLayer
's Polygon
has been tapped on.
Alternatively, you can use the Mapbox Annotation Plugin, which provides onClick()
and onLongClick()
listening.