Examples
Dynamic styling (32)

Query a map feature

package com.mapbox.mapboxandroiddemo.examples.query;
import android.graphics.PointF;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;
import com.google.gson.JsonElement;
import com.mapbox.geojson.Feature;
import com.mapbox.mapboxandroiddemo.R;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.annotations.Marker;
import com.mapbox.mapboxsdk.annotations.MarkerOptions;
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 java.util.List;
import java.util.Map;
/**
* Display map property information for a clicked map feature
*/
public class QueryFeatureActivity extends AppCompatActivity implements OnMapReadyCallback,
MapboxMap.OnMapClickListener {
private MapView mapView;
private Marker featureMarker;
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_feature);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
}
@Override
public void onMapReady(@NonNull final MapboxMap mapboxMap) {
QueryFeatureActivity.this.mapboxMap = mapboxMap;
mapboxMap.setStyle(Style.MAPBOX_STREETS, new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
mapboxMap.addOnMapClickListener(QueryFeatureActivity.this);
Toast.makeText(QueryFeatureActivity.this,
getString(R.string.click_on_map_instruction), Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onMapClick(@NonNull LatLng point) {
final PointF pixel = mapboxMap.getProjection().toScreenLocation(point);
List<Feature> features = mapboxMap.queryRenderedFeatures(pixel);
if (features.size() > 0) {
Feature feature = features.get(0);
String property;
StringBuilder stringBuilder = new StringBuilder();
if (feature.properties() != null) {
for (Map.Entry<String, JsonElement> entry : feature.properties().entrySet()) {
stringBuilder.append(String.format("%s - %s", entry.getKey(), entry.getValue()));
stringBuilder.append(System.getProperty("line.separator"));
}
featureMarker = mapboxMap.addMarker(new MarkerOptions()
.position(point)
.title(getString(R.string.query_feature_marker_title))
.snippet(stringBuilder.toString())
);
} else {
property = getString(R.string.query_feature_marker_snippet);
featureMarker = mapboxMap.addMarker(new MarkerOptions()
.position(point)
.snippet(property)
);
}
} else {
featureMarker = mapboxMap.addMarker(new MarkerOptions()
.position(point)
.snippet(getString(R.string.query_feature_marker_snippet))
);
}
mapboxMap.selectMarker(featureMarker);
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);
}
}