Examples
Dynamic styling (32)

Click on a single layer

package com.mapbox.mapboxandroiddemo.examples.query;
import android.graphics.PointF;
import android.graphics.RectF;
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.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.FillLayer;
import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;
import java.net.URL;
import java.util.List;
import timber.log.Timber;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.fillOpacity;
/**
* Detect click events on a polygon that was added as a GeoJsonSource.
*/
public class ClickOnLayerActivity extends AppCompatActivity implements OnMapReadyCallback,
MapboxMap.OnMapClickListener {
private MapView mapView;
private MapboxMap mapboxMap;
private static final String geoJsonSourceId = "geoJsonData";
private static final String geoJsonLayerId = "polygonFillLayer";
@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_click_on_layer);
Toast.makeText(ClickOnLayerActivity.this, R.string.click_on_polygon_toast_instruction,
Toast.LENGTH_SHORT).show();
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
}
@Override
public void onMapReady(@NonNull final MapboxMap mapboxMap) {
ClickOnLayerActivity.this.mapboxMap = mapboxMap;
mapboxMap.setStyle(Style.MAPBOX_STREETS, new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
mapboxMap.addOnMapClickListener(ClickOnLayerActivity.this);
addGeoJsonSourceToMap(style);
// Create FillLayer with GeoJSON source and add the FillLayer to the map
if (style != null) {
style.addLayer(new FillLayer(geoJsonLayerId, geoJsonSourceId)
.withProperties(fillOpacity(0.5f)));
}
}
});
}
@Override
public boolean onMapClick(@NonNull LatLng point) {
PointF pointf = mapboxMap.getProjection().toScreenLocation(point);
RectF rectF = new RectF(pointf.x - 10, pointf.y - 10, pointf.x + 10, pointf.y + 10);
List<Feature> featureList = mapboxMap.queryRenderedFeatures(rectF, geoJsonLayerId);
if (featureList.size() > 0) {
for (Feature feature : featureList) {
Timber.d("Feature found with %1$s", feature.toJson());
Toast.makeText(ClickOnLayerActivity.this, R.string.click_on_polygon_toast,
Toast.LENGTH_SHORT).show();
}
return true;
}
return false;
}
private void addGeoJsonSourceToMap(@NonNull Style loadedMapStyle) {
try {
// Add GeoJsonSource to map
loadedMapStyle.addSource(new GeoJsonSource(geoJsonSourceId, new URL("https://gist.githubusercontent"
+ ".com/tobrun/cf0d689c8187d42ebe62757f6d0cf137/raw/4d8ac3c8333f1517df9d303"
+ "d58f20f4a1d8841e8/regions.geojson")));
} catch (Throwable throwable) {
Timber.e("Couldn't add GeoJsonSource to map - %s", throwable);
}
}
@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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