Circle to icon transition
A newer version of the Maps SDK is available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 A newer version of the SDK is available.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, v11.3.0, 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.
activity_circle_to_icon_transition
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
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.dds.CircleToIconTransitionActivity">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="34.692349"
mapbox:mapbox_cameraTargetLng="135.497272"
mapbox:mapbox_cameraZoom="8"
mapbox:mapbox_cameraZoomMin="6" />
</FrameLayout>
CircleToIconTransitionActivity.java
package com.mapbox.mapboxandroiddemo.examples.dds;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.Toast;
import com.mapbox.geojson.Feature;
import com.mapbox.geojson.FeatureCollection;
import com.mapbox.geojson.Point;
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.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.CircleLayer;
import com.mapbox.mapboxsdk.style.layers.SymbolLayer;
import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;
import com.mapbox.mapboxsdk.utils.BitmapUtils;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import static com.mapbox.mapboxsdk.style.expressions.Expression.interpolate;
import static com.mapbox.mapboxsdk.style.expressions.Expression.linear;
import static com.mapbox.mapboxsdk.style.expressions.Expression.stop;
import static com.mapbox.mapboxsdk.style.expressions.Expression.zoom;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.circleColor;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.circleOpacity;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.circleRadius;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconAllowOverlap;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconIgnorePlacement;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconImage;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconSize;
/**
* Create a smooth visual transition between circles and icons based on zooming in and out.
*/
public class CircleToIconTransitionActivity extends AppCompatActivity implements OnMapReadyCallback {
private static final float BASE_CIRCLE_INITIAL_RADIUS = 3.4f;
private static final float RADIUS_WHEN_CIRCLES_MATCH_ICON_RADIUS = 14f;
private static final float ZOOM_LEVEL_FOR_START_OF_BASE_CIRCLE_EXPANSION = 11f;
private static final float ZOOM_LEVEL_FOR_SWITCH_FROM_CIRCLE_TO_ICON = 12f;
private static final float FINAL_OPACITY_OF_SHADING_CIRCLE = .5f;
private static final String BASE_CIRCLE_COLOR = "#3BC802";
private static final String SHADING_CIRCLE_COLOR = "#858585";
private static final String SOURCE_ID = "SOURCE_ID";
private static final String ICON_LAYER_ID = "ICON_LAYER_ID";
private static final String BASE_CIRCLE_LAYER_ID = "BASE_CIRCLE_LAYER_ID";
private static final String SHADOW_CIRCLE_LAYER_ID = "SHADOW_CIRCLE_LAYER_ID";
private static final String ICON_IMAGE_ID = "ICON_ID";
private MapView mapView;
@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));
// This contains the MapView in XML and needs to be called after the access token is configured.
setContentView(R.layout.activity_circle_to_icon_transition);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
}
@Override
public void onMapReady(final MapboxMap mapboxMap) {
mapboxMap.setStyle(new Style.Builder().fromUri(Style.LIGHT)
// Add images to the map so that the SymbolLayers can reference the images.
.withImage(ICON_IMAGE_ID, BitmapUtils.getBitmapFromDrawable(
getResources().getDrawable(R.drawable.atm_symbol_icon)))
// Add GeoJSON data to the GeoJsonSource and then add the GeoJsonSource to the map
.withSource(new GeoJsonSource(SOURCE_ID,
FeatureCollection.fromFeatures(initFeatureArray()))), new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
// Add the base CircleLayer, which will show small circles when the map is zoomed far enough
// away from the map.
CircleLayer baseCircleLayer = new CircleLayer(BASE_CIRCLE_LAYER_ID, SOURCE_ID).withProperties(
circleColor(Color.parseColor(BASE_CIRCLE_COLOR)),
circleRadius(
interpolate(
linear(), zoom(),
stop(ZOOM_LEVEL_FOR_START_OF_BASE_CIRCLE_EXPANSION, BASE_CIRCLE_INITIAL_RADIUS),
stop(ZOOM_LEVEL_FOR_SWITCH_FROM_CIRCLE_TO_ICON, RADIUS_WHEN_CIRCLES_MATCH_ICON_RADIUS)
)
)
);
style.addLayer(baseCircleLayer);
// Add a "shading" CircleLayer, whose circles' radii will match the radius of the SymbolLayer
// circular icon
CircleLayer shadowTransitionCircleLayer = new CircleLayer(SHADOW_CIRCLE_LAYER_ID, SOURCE_ID)
.withProperties(
circleColor(Color.parseColor(SHADING_CIRCLE_COLOR)),
circleRadius(RADIUS_WHEN_CIRCLES_MATCH_ICON_RADIUS),
circleOpacity(
interpolate(
linear(), zoom(),
stop(ZOOM_LEVEL_FOR_START_OF_BASE_CIRCLE_EXPANSION - .5, 0),
stop(ZOOM_LEVEL_FOR_START_OF_BASE_CIRCLE_EXPANSION, FINAL_OPACITY_OF_SHADING_CIRCLE)
)
)
);
style.addLayerBelow(shadowTransitionCircleLayer, BASE_CIRCLE_LAYER_ID);
// Add the SymbolLayer
SymbolLayer symbolIconLayer = new SymbolLayer(ICON_LAYER_ID, SOURCE_ID);
symbolIconLayer.withProperties(
iconImage(ICON_IMAGE_ID),
iconSize(1.5f),
iconIgnorePlacement(true),
iconAllowOverlap(true)
);
symbolIconLayer.setMinZoom(ZOOM_LEVEL_FOR_SWITCH_FROM_CIRCLE_TO_ICON);
style.addLayer(symbolIconLayer);
Toast.makeText(CircleToIconTransitionActivity.this,
R.string.zoom_map_in_and_out_circle_to_icon_transition, Toast.LENGTH_SHORT).show();
mapboxMap.animateCamera(CameraUpdateFactory
.newCameraPosition(new CameraPosition.Builder()
.zoom(12.5)
.build()), 3000);
}
}
);
}
private Feature[] initFeatureArray() {
return new Feature[] {
Feature.fromGeometry(Point.fromLngLat(
135.516316,
34.681345)),
Feature.fromGeometry(Point.fromLngLat(
135.509537,
34.707929)),
Feature.fromGeometry(Point.fromLngLat(
135.487953,
34.680369)),
Feature.fromGeometry(Point.fromLngLat(
135.479682,
34.698283)),
Feature.fromGeometry(Point.fromLngLat(
135.499368,
34.708894)),
Feature.fromGeometry(Point.fromLngLat(
135.469701,
34.691089)),
Feature.fromGeometry(Point.fromLngLat(
135.471265,
34.672435)),
Feature.fromGeometry(Point.fromLngLat(
135.485418,
34.704285)),
Feature.fromGeometry(Point.fromLngLat(
135.493762,
34.669337)),
Feature.fromGeometry(Point.fromLngLat(
135.509407,
34.696032)),
Feature.fromGeometry(Point.fromLngLat(
135.492719,
34.68424)),
Feature.fromGeometry(Point.fromLngLat(
135.51045,
34.684133)),
Feature.fromGeometry(Point.fromLngLat(
135.500802,
34.700212)),
Feature.fromGeometry(Point.fromLngLat(
135.519576,
34.698712)),
Feature.fromGeometry(Point.fromLngLat(
135.502888,
34.67888)),
Feature.fromGeometry(Point.fromLngLat(
135.518533,
34.67116))
};
}
@Override
public void onStart() {
super.onStart();
mapView.onStart();
}
@Override
public void onResume() {
super.onResume();
mapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mapView.onPause();
}
@Override
public void onStop() {
super.onStop();
mapView.onStop();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
@Override
protected void onDestroy() {
super.onDestroy();
mapView.onDestroy();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
}