Display 3D building height based on vector data
A newer version of the Maps SDK is available
This page uses v9.7.1 of the Mapbox Maps SDK. A newer version of the SDK is available. Learn about the latest version, v11.9.0, in the Maps SDK documentation.
Note
This example is a part of the Mapbox Android Demo app. You can find the values for all referenced resources in the res directory. For example, see res/values/activity_strings.xml for R.string.* references used in this example. The dependencies can be found here.The examples use View binding.See setup documention if necessary.
activity_population_density_extrusion
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:mapbox="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.mapbox.mapboxandroiddemo.examples.extrusions.PopulationDensityExtrusionActivity">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.0"
mapbox:mapbox_cameraTargetLat="37.784282779035216"
mapbox:mapbox_cameraTargetLng="-122.4232292175293"
mapbox:mapbox_cameraZoom="12"
mapbox:mapbox_cameraZoomMax="16"
mapbox:mapbox_cameraZoomMin="12"
mapbox:mapbox_cameraTilt="45"
>
</com.mapbox.mapboxsdk.maps.MapView>
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="20dp"/>
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="20dp"/>
</androidx.constraintlayout.widget.ConstraintLayout>
PopulationDensityExtrusionActivity.java
package com.mapbox.mapboxandroiddemo.examples.extrusions;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import com.mapbox.mapboxandroiddemo.R;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.camera.CameraPosition;
import com.mapbox.mapboxsdk.camera.CameraUpdateFactory;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.mapboxsdk.maps.Style;
import com.mapbox.mapboxsdk.style.layers.FillExtrusionLayer;
import com.mapbox.mapboxsdk.style.layers.FillLayer;
import com.mapbox.mapboxsdk.style.sources.VectorSource;
import static com.mapbox.mapboxsdk.style.expressions.Expression.all;
import static com.mapbox.mapboxsdk.style.expressions.Expression.exponential;
import static com.mapbox.mapboxsdk.style.expressions.Expression.get;
import static com.mapbox.mapboxsdk.style.expressions.Expression.gt;
import static com.mapbox.mapboxsdk.style.expressions.Expression.interpolate;
import static com.mapbox.mapboxsdk.style.expressions.Expression.literal;
import static com.mapbox.mapboxsdk.style.expressions.Expression.lt;
import static com.mapbox.mapboxsdk.style.expressions.Expression.rgb;
import static com.mapbox.mapboxsdk.style.expressions.Expression.stop;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.fillColor;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.fillExtrusionBase;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.fillExtrusionColor;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.fillExtrusionHeight;
/**
* Use imported vector data to set the height of 3D building extrusions
*/
public class PopulationDensityExtrusionActivity extends AppCompatActivity implements OnMapReadyCallback {
private MapView mapView;
private MapboxMap mapboxMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Mapbox access token is configured here. This needs to be called either in your application
// object or in the same activity which contains the mapview.
Mapbox.getInstance(this, getString(R.string.access_token));
setContentView(R.layout.activity_population_density_extrusion);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
}
@Override
public void onMapReady(@NonNull final MapboxMap mapboxMap) {
this.mapboxMap = mapboxMap;
mapboxMap.setStyle(Style.DARK, new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
style.addSource(
new VectorSource("population", "mapbox://peterqliu.d0vin3el")
);
addFillsLayer(style);
addExtrusionsLayer(style);
}
});
}
private void addFillsLayer(@NonNull Style loadedMapStyle) {
FillLayer fillsLayer = new FillLayer("fills", "population");
fillsLayer.setSourceLayer("outgeojson");
fillsLayer.setFilter(all(lt(get("pkm2"), literal(300000))));
fillsLayer.withProperties(
fillColor(interpolate(exponential(1f), get("pkm2"),
stop(0, rgb(22, 14, 35)),
stop(14500, rgb(0, 97, 127)),
stop(145000, rgb(85, 223, 255)))));
loadedMapStyle.addLayerBelow(fillsLayer, "water");
}
private void addExtrusionsLayer(@NonNull Style loadedMapStyle) {
FillExtrusionLayer fillExtrusionLayer = new FillExtrusionLayer("extrusions", "population");
fillExtrusionLayer.setSourceLayer("outgeojson");
fillExtrusionLayer.setFilter(all(gt(get("p"), 1), lt(get("pkm2"), 300000)));
fillExtrusionLayer.withProperties(
fillExtrusionColor(interpolate(exponential(1f), get("pkm2"),
stop(0, rgb(22, 14, 35)),
stop(14500, rgb(0, 97, 127)),
stop(145000, rgb(85, 233, 255)))),
fillExtrusionBase(0f),
fillExtrusionHeight(interpolate(exponential(1f), get("pkm2"),
stop(0, 0f),
stop(1450000, 20000f))));
loadedMapStyle.addLayerBelow(fillExtrusionLayer, "airport-label");
}
@Override
protected void onStart() {
super.onStart();
mapView.onStart();
}
@Override
protected void onResume() {
super.onResume();
mapView.onResume();
}
@Override
protected void onPause() {
super.onPause();
mapView.onPause();
}
@Override
protected void onStop() {
super.onStop();
mapView.onStop();
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
@Override
public void onDestroy() {
super.onDestroy();
mapView.onDestroy();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_population_density_spinner_menu_cities, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.san_francisco:
goToNewLocation(37.784282779035216, -122.4232292175293);
return true;
case R.id.los_angeles:
goToNewLocation(34.04412546508576, -118.28636169433594);
return true;
case R.id.seattle:
goToNewLocation(47.60651025683697, -122.33327865600585);
return true;
case R.id.new_orleans:
goToNewLocation(29.946159058399612, -90.10042190551758);
return true;
case R.id.chicago:
goToNewLocation(41.87531293759582, -87.6240348815918);
return true;
case R.id.philadelphia:
goToNewLocation(39.95370120254379, -75.1626205444336);
return true;
case R.id.new_york:
goToNewLocation(40.72228267283148, -73.99772644042969);
return true;
case R.id.atlanta:
goToNewLocation(33.74910736130734, -84.39079284667969);
return true;
case R.id.portland:
goToNewLocation(45.522104713562825, -122.67179489135742);
return true;
case R.id.denver:
goToNewLocation(39.74428621972816, -104.99565124511719);
return true;
case R.id.minneapolis:
goToNewLocation(44.969656023708175, -93.26637268066406);
return true;
case R.id.miami:
goToNewLocation(25.773846629676616, -80.19624710083008);
return true;
case android.R.id.home:
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void goToNewLocation(double lat, double longitude) {
LatLng newPosition = new LatLng();
newPosition.setLatitude(lat);
newPosition.setLongitude(longitude);
CameraPosition position = new CameraPosition.Builder()
.target(newPosition)
.build();
mapboxMap.moveCamera(CameraUpdateFactory
.newCameraPosition(position));
}
}