Examples

Icon setting based on Feature property

activity_dds_property_icon_switch
<?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=".examples.dds.PropertyIconDeterminationActivity">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="22.75"
mapbox:mapbox_cameraTargetLng="80.52"
mapbox:mapbox_cameraZoom="3.05" />
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="130dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="35dp"
android:layout_gravity="bottom|center_horizontal">
<TextView
android:id="@+id/feature_info"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textColor="@color/mapboxBlue"
android:textSize="18sp" />
</androidx.cardview.widget.CardView>
</FrameLayout>
PropertyIconDeterminationActivity
package com.mapbox.mapboxandroiddemo.examples.dds;
import android.graphics.BitmapFactory;
import android.graphics.PointF;
import android.os.Bundle;
import android.widget.TextView;
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.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.Property;
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 com.mapbox.mapboxsdk.style.expressions.Expression.get;
import static com.mapbox.mapboxsdk.style.expressions.Expression.literal;
import static com.mapbox.mapboxsdk.style.expressions.Expression.match;
import static com.mapbox.mapboxsdk.style.expressions.Expression.stop;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconAllowOverlap;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconAnchor;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconImage;
/**
* Display {@link SymbolLayer} icons on the map and determine the appropriate icon
* based on a property in each {@link Feature}.
*/
public class PropertyIconDeterminationActivity extends AppCompatActivity implements
OnMapReadyCallback, MapboxMap.OnMapClickListener {
private static final String SOURCE_ID = "SOURCE_ID";
private static final String RED_ICON_ID = "RED_ICON_ID";
private static final String YELLOW_ICON_ID = "YELLOW_ICON_ID";
private static final String LAYER_ID = "LAYER_ID";
private static final String ICON_PROPERTY = "ICON_PROPERTY";
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));
// This contains the MapView in XML and needs to be called after the access token is configured.
setContentView(R.layout.activity_dds_property_icon_switch);
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/cj44mfrt20f082snokim4ungi")
// Add the SymbolLayer icon image to the map style
.withImage(RED_ICON_ID, BitmapFactory.decodeResource(
PropertyIconDeterminationActivity.this.getResources(), R.drawable.red_marker))
.withImage(YELLOW_ICON_ID, BitmapFactory.decodeResource(
PropertyIconDeterminationActivity.this.getResources(), R.drawable.yellow_marker))
// Adding a GeoJson source for the SymbolLayer icons.
.withSource(new GeoJsonSource(SOURCE_ID,
FeatureCollection.fromFeatures(initCoordinateData())))
// Adding the actual SymbolLayer to the map style. The match expression will check the
// ICON_PROPERTY property key and then use the partner value for the actual icon id.
.withLayer(new SymbolLayer(LAYER_ID, SOURCE_ID)
.withProperties(iconImage(match(
get(ICON_PROPERTY), literal(RED_ICON_ID),
stop(YELLOW_ICON_ID, YELLOW_ICON_ID),
stop(RED_ICON_ID, RED_ICON_ID))),
iconAllowOverlap(true),
iconAnchor(Property.ICON_ANCHOR_BOTTOM))
), new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
// Map is set up and the style has loaded. Now you can add additional data or make other map adjustments.
PropertyIconDeterminationActivity.this.mapboxMap = mapboxMap;
mapboxMap.addOnMapClickListener(PropertyIconDeterminationActivity.this);
Toast.makeText(PropertyIconDeterminationActivity.this, R.string.tap_on_marker_instruction,
Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onMapClick(@NonNull LatLng point) {
return handleClickIcon(mapboxMap.getProjection().toScreenLocation(point));
}
/**
* This method handles click events for SymbolLayer symbols.
*
* @param screenPoint the point on screen clicked
*/
private boolean handleClickIcon(PointF screenPoint) {
List<Feature> features = mapboxMap.queryRenderedFeatures(screenPoint, LAYER_ID);
if (!features.isEmpty()) {
// Show the Feature in the TextView to show that the icon is based on the ICON_PROPERTY key/value
TextView featureInfoTextView = findViewById(R.id.feature_info);
featureInfoTextView.setText(features.get(0).toJson());
return true;
} else {
return false;
}
}
private List<Feature> initCoordinateData() {
Feature singleFeatureOne = Feature.fromGeometry(
Point.fromLngLat(72.88055419921875,
19.05822387777432));
singleFeatureOne.addStringProperty(ICON_PROPERTY, RED_ICON_ID);
Feature singleFeatureTwo = Feature.fromGeometry(
Point.fromLngLat(77.22015380859375,
28.549544699103865));
singleFeatureTwo.addStringProperty(ICON_PROPERTY, YELLOW_ICON_ID);
Feature singleFeatureThree = Feature.fromGeometry(
Point.fromLngLat(88.36647033691406,
22.52016858599439));
singleFeatureThree.addStringProperty(ICON_PROPERTY, RED_ICON_ID);
// Not adding a ICON_PROPERTY property to fourth and fifth features in order to show off the default
// nature of the match expression used in the example up above
Feature singleFeatureFour = Feature.fromGeometry(
Point.fromLngLat(78.42315673828125,
17.43320034474222));
Feature singleFeatureFive = Feature.fromGeometry(
Point.fromLngLat(80.16448974609375,
12.988500396985364));
List<Feature> symbolLayerIconFeatureList = new ArrayList<>();
symbolLayerIconFeatureList.add(singleFeatureOne);
symbolLayerIconFeatureList.add(singleFeatureTwo);
symbolLayerIconFeatureList.add(singleFeatureThree);
symbolLayerIconFeatureList.add(singleFeatureFour);
symbolLayerIconFeatureList.add(singleFeatureFive);
return symbolLayerIconFeatureList;
}
@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);
}
}
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