Examples

Select a building

activity_query_select_building
<?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.query.SelectBuildingActivity">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="29.7565"
mapbox:mapbox_cameraTargetLng="-95.3625"
mapbox:mapbox_cameraZoom="16"/>
</FrameLayout>
SelectBuildingActivity
package com.mapbox.mapboxandroiddemo.examples.query;
import android.graphics.Color;
import android.graphics.PointF;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.widget.Toast;
import com.mapbox.geojson.Feature;
import com.mapbox.geojson.FeatureCollection;
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.layers.PropertyFactory;
import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;
import java.util.List;
/**
* Use the query feature to select a building, get its geometry, and draw a polygon highlighting it.
*/
public class SelectBuildingActivity extends AppCompatActivity implements OnMapReadyCallback,
MapboxMap.OnMapClickListener {
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_query_select_building);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
}
@Override
public void onMapReady(@NonNull final MapboxMap mapboxMap) {
SelectBuildingActivity.this.mapboxMap = mapboxMap;
mapboxMap.setStyle(Style.LIGHT, new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
style.addSource(new GeoJsonSource("source-id"));
style.addLayer(new FillLayer("layer-id", "source-id").withProperties(
PropertyFactory.fillColor(Color.parseColor("#8A8ACB"))
));
mapboxMap.addOnMapClickListener(SelectBuildingActivity.this);
Toast.makeText(SelectBuildingActivity.this,
getString(R.string.click_on_map_instruction), Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onMapClick(@NonNull LatLng point) {
mapboxMap.getStyle(new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
final PointF finalPoint = mapboxMap.getProjection().toScreenLocation(point);
List<Feature> features = mapboxMap.queryRenderedFeatures(finalPoint, "building");
if (features.size() > 0) {
GeoJsonSource selectedBuildingSource = style.getSourceAs("source-id");
if (selectedBuildingSource != null) {
selectedBuildingSource.setGeoJson(FeatureCollection.fromFeatures(features));
}
}
}
});
return true;
}
@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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