Circle icon toggle

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_dds_circle_icon_toggle_on_click
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".examples.dds.CircleIconToggleOnClickActivity">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
CircleIconToggleOnClickActivity.java
package com.mapbox.mapboxandroiddemo.examples.dds;
import android.graphics.BitmapFactory;
import android.graphics.PointF;
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.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.CircleLayer;
import com.mapbox.mapboxsdk.style.layers.SymbolLayer;
import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;
import java.util.ArrayList;
import java.util.List;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import static android.graphics.Color.parseColor;
import static com.mapbox.mapboxsdk.style.expressions.Expression.eq;
import static com.mapbox.mapboxsdk.style.expressions.Expression.get;
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.literal;
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.circleRadius;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconAllowOverlap;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconImage;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconOffset;
/**
* Use layer filters and Feature properties to create the visual effect of
* toggling between circles and icons when they're tapped on.
*/
public class CircleIconToggleOnClickActivity extends AppCompatActivity implements
OnMapReadyCallback, MapboxMap.OnMapClickListener {
private static final String CIRCLE_LAYER_ID = "CIRCLE_LAYER_ID";
private static final String MARKER_LAYER_ID = "MARKER_LAYER_ID";
private static final String SOURCE_ID = "SOURCE_ID";
private static final String MARKER_ICON_ID = "MARKER_ICON_ID";
private static final String PROPERTY_ID = "PROPERTY_ID";
private static final String PROPERTY_SELECTED = "PROPERTY_SELECTED";
private MapView mapView;
private MapboxMap mapboxMap;
private FeatureCollection featureCollection;
@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_dds_circle_icon_toggle_on_click);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
}
@Override
public void onMapReady(@NonNull final MapboxMap mapboxMap) {
mapboxMap.setStyle(new Style.Builder().fromUri("mapbox://styles/mapbox/cj4k8wmwy5lbt2smsigkbh18e"),
new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
CircleIconToggleOnClickActivity.this.mapboxMap = mapboxMap;
mapboxMap.animateCamera(
CameraUpdateFactory.newCameraPosition(new CameraPosition.Builder()
.zoom(4)
.target(new LatLng(-19.476950206488414, 46.58203125))
.build()), 2000);
initFeatureCollection();
style.addSource(new GeoJsonSource(SOURCE_ID, featureCollection));
// Add the CircleLayer and set the filter so that circle are only shown
// if the PROPERTY_SELECTED boolean property is false.
CircleLayer circleLayer = new CircleLayer(CIRCLE_LAYER_ID, SOURCE_ID)
.withProperties(
circleRadius(interpolate(linear(), zoom(),
stop(2, 5f),
stop(3, 20f)
)),
circleColor(parseColor("#2196F3")));
circleLayer.setFilter(eq(get(PROPERTY_SELECTED), literal(false)));
style.addLayer(circleLayer);
// Add the marker icon image to the map
style.addImage(MARKER_ICON_ID, BitmapFactory.decodeResource(
CircleIconToggleOnClickActivity.this.getResources(), R.drawable.blue_marker_view));
// Add the SymbolLayer and set the filter so that circle are only shown
// if the PROPERTY_SELECTED boolean property is true.
SymbolLayer symbolLayer = new SymbolLayer(MARKER_LAYER_ID, SOURCE_ID)
.withProperties(iconImage(MARKER_ICON_ID),
iconAllowOverlap(true),
iconOffset(new Float[] {0f, -13f})
);
symbolLayer.setFilter(eq(get(PROPERTY_SELECTED), literal(true)));
style.addLayer(symbolLayer);
mapboxMap.addOnMapClickListener(CircleIconToggleOnClickActivity.this);
Toast.makeText(CircleIconToggleOnClickActivity.this, R.string.tap_on_map_to_toggle_instruction,
Toast.LENGTH_SHORT).show();
}
});
}
/**
* Create sample data to use for both the {@link CircleLayer} and
* {@link SymbolLayer}.
*/
private void initFeatureCollection() {
List<Feature> markerCoordinates = new ArrayList<>();
Feature featureOne = Feature.fromGeometry(
Point.fromLngLat(45.37353515625, -14.32825967774));
featureOne.addStringProperty(PROPERTY_ID, "1");
featureOne.addBooleanProperty(PROPERTY_SELECTED, false);
markerCoordinates.add(featureOne);
Feature featureTwo = Feature.fromGeometry(
Point.fromLngLat(50.1416015625, -20.200346006493735));
featureTwo.addStringProperty(PROPERTY_ID, "2");
featureTwo.addBooleanProperty(PROPERTY_SELECTED, false);
markerCoordinates.add(featureTwo);
Feature featureThree = Feature.fromGeometry(
Point.fromLngLat(42.86865234375, -24.266997288418157));
featureThree.addStringProperty(PROPERTY_ID, "3");
featureThree.addBooleanProperty(PROPERTY_SELECTED, false);
markerCoordinates.add(featureThree);
featureCollection = FeatureCollection.fromFeatures(markerCoordinates);
}
@Override
public boolean onMapClick(@NonNull LatLng point) {
handleClickIcon(mapboxMap.getProjection().toScreenLocation(point));
return true;
}
/**
* This method handles click events for both layers.
* <p>
* The PROPERTY_SELECTED feature property is set to its opposite, so
* that the visual toggling between circles and icons is correct.
*
* @param screenPoint the point on screen clicked
*/
private boolean handleClickIcon(PointF screenPoint) {
List<Feature> selectedCircleFeatureList = mapboxMap.queryRenderedFeatures(screenPoint, CIRCLE_LAYER_ID);
List<Feature> selectedMarkerFeatureList = mapboxMap.queryRenderedFeatures(screenPoint, MARKER_LAYER_ID);
if (!selectedCircleFeatureList.isEmpty()) {
Feature selectedCircleFeature = selectedCircleFeatureList.get(0);
for (int x = 0; x < featureCollection.features().size(); x++) {
if (selectedCircleFeature.getStringProperty(PROPERTY_ID)
.equals(featureCollection.features().get(x).getStringProperty(PROPERTY_ID))) {
if (featureSelectStatusIsTrue(selectedCircleFeature)) {
setFeatureSelectState(x, featureCollection.features().get(x), true);
} else {
setSelected(x);
}
}
}
} else if (!selectedMarkerFeatureList.isEmpty()) {
Feature selectedMarkerFeature = selectedMarkerFeatureList.get(0);
for (int x = 0; x < featureCollection.features().size(); x++) {
if (selectedMarkerFeature.getStringProperty(PROPERTY_ID)
.equals(featureCollection.features().get(x).getStringProperty(PROPERTY_ID))) {
if (featureSelectStatusIsTrue(selectedMarkerFeature)) {
setFeatureSelectState(x, featureCollection.features().get(x), false);
} else {
setSelected(x);
}
}
}
} else {
// Reset all features to unselected so that all circles are shown and no icons are shown
for (int x = 0; x < featureCollection.features().size(); x++) {
setFeatureSelectState(x, featureCollection.features().get(x), false);
}
}
return true;
}
/**
* Set a feature selected state.
*
* @param index the index of selected feature
*/
private void setSelected(int index) {
if (featureCollection.features() != null) {
Feature feature = featureCollection.features().get(index);
setFeatureSelectState(index, feature, true);
refreshSource();
}
}
/**
* Updates the display of data on the map after the FeatureCollection has been modified
*/
private void refreshSource() {
mapboxMap.getStyle(new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
GeoJsonSource geoJsonSource = style.getSourceAs(SOURCE_ID);
if (geoJsonSource != null && featureCollection != null) {
geoJsonSource.setGeoJson(featureCollection);
}
}
});
}
/**
* Selects the state of a feature
*
* @param feature the feature to be selected.
*/
private void setFeatureSelectState(int index, Feature feature, boolean selectedState) {
feature.addBooleanProperty(PROPERTY_SELECTED, selectedState);
featureCollection.features().set(index, feature);
refreshSource();
}
/**
* Checks whether a Feature's boolean "selected" property is true or false
*
* @param selectedFeature the specific Feature to check
* @return true if "selected" is true. False if the boolean property is false.
*/
private boolean featureSelectStatusIsTrue(Feature selectedFeature) {
if (featureCollection == null) {
return false;
}
return selectedFeature.getBooleanProperty(PROPERTY_SELECTED);
}
@Override
public void onResume() {
super.onResume();
mapView.onResume();
}
@Override
protected void onStart() {
super.onStart();
mapView.onStart();
}
@Override
protected void onStop() {
super.onStop();
mapView.onStop();
}
@Override
public void onPause() {
super.onPause();
mapView.onPause();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mapboxMap != null) {
mapboxMap.removeOnMapClickListener(this);
}
mapView.onDestroy();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
}