Examples
Dynamic styling (32)

Zoom-based icon switch

package com.mapbox.mapboxandroiddemo.examples.dds;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
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.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.SymbolLayer;
import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;
import com.mapbox.mapboxsdk.utils.BitmapUtils;
import static com.mapbox.mapboxsdk.style.expressions.Expression.literal;
import static com.mapbox.mapboxsdk.style.expressions.Expression.step;
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.iconAllowOverlap;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconIgnorePlacement;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconImage;
/**
* Use the SymbolLayer's setMinZoom and setMaxZoom methods to create the effect of SymbolLayer icons switching
* based on the map camera's zoom level.
*/
public class SymbolSwitchOnZoomActivity extends AppCompatActivity implements OnMapReadyCallback {
private static final float ZOOM_LEVEL_FOR_SWITCH = 12;
private static final String BLUE_PERSON_ICON_ID = "blue-car-icon-marker-icon-id";
private static final String BLUE_PIN_ICON_ID = "blue-marker-icon-marker-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_zoom_based_icon_switch);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
}
@Override
public void onMapReady(final MapboxMap mapboxMap) {
mapboxMap.setStyle(new Style.Builder().fromUrl(Style.OUTDOORS)
// Add images to the map so that the SymbolLayers can reference the images.
.withImage(BLUE_PERSON_ICON_ID, BitmapUtils.getBitmapFromDrawable(
getResources().getDrawable(R.drawable.ic_person)))
.withImage(BLUE_PIN_ICON_ID, BitmapUtils.getBitmapFromDrawable(
getResources().getDrawable(R.drawable.blue_marker)))
// Add random data to the GeoJsonSource and then add the GeoJsonSource to the map
.withSource(new GeoJsonSource("source-id",
FeatureCollection.fromFeatures(new Feature[] {
Feature.fromGeometry(Point.fromLngLat(
9.205394983291626,
45.47661043757903)),
Feature.fromGeometry(Point.fromLngLat(
9.223880767822266,
45.47623240235297)),
Feature.fromGeometry(Point.fromLngLat(
9.15530204772949,
45.4706650227671)),
Feature.fromGeometry(Point.fromLngLat(
9.153714179992676,
45.48625229963004)),
Feature.fromGeometry(Point.fromLngLat(
9.158306121826172,
45.482731998239636)),
Feature.fromGeometry(Point.fromLngLat(
9.188523888587952,
45.4923746929562)),
Feature.fromGeometry(Point.fromLngLat(
9.20929491519928,
45.45314676076135)),
Feature.fromGeometry(Point.fromLngLat(
9.177778959274292,
45.45569808340158))
})
)), new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
// Create a SymbolLayer and use the {@link com.mapbox.mapboxsdk.style.expressions.Expression.step()}
// to adjust the SymbolLayer icon based on the zoom level. The blue person icon is set as the default
// icon and then a step is used to switch to the blue person icon at a certain map camera zoom level.
SymbolLayer singleLayer = new SymbolLayer("symbol-layer-id", "source-id");
singleLayer.setProperties(
iconImage(step(zoom(), literal(BLUE_PERSON_ICON_ID),
stop(ZOOM_LEVEL_FOR_SWITCH, BLUE_PIN_ICON_ID))),
iconIgnorePlacement(true),
iconAllowOverlap(true));
style.addLayer(singleLayer);
Toast.makeText(SymbolSwitchOnZoomActivity.this,
R.string.zoom_map_in_and_out_icon_switch_instruction, Toast.LENGTH_SHORT).show();
}
}
);
}
@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);
}
}
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