フィーチャ数
<?xml version="1.0" encoding="utf-8"?><androidx.coordinatorlayout.widget.CoordinatorLayoutxmlns: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"android:id="@+id/query_feature_count_map_container"tools:context=".examples.query.FeatureCountActivity"> <RelativeLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"> <com.mapbox.mapboxsdk.maps.MapViewandroid:id="@+id/mapView"android:layout_width="match_parent"android:layout_height="match_parent"mapbox:mapbox_cameraTargetLat="40.73581"mapbox:mapbox_cameraTargetLng="-73.99155"mapbox:mapbox_cameraZoom="16"/> <FrameLayoutandroid:id="@+id/selection_box"android:layout_width="150dp"android:layout_height="150dp"android:layout_centerInParent="true"android:alpha="0.3"android:background="#A4A4E5"/> </RelativeLayout> </androidx.coordinatorlayout.widget.CoordinatorLayout>
FeatureCountActivity.java
package com.mapbox.mapboxandroiddemo.examples.query; import android.graphics.Color;import android.graphics.RectF;import android.os.Bundle;import androidx.annotation.NonNull;import com.google.android.material.snackbar.Snackbar;import androidx.appcompat.app.AppCompatActivity;import android.view.View;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.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.util.List; import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.fillColor; /*** Get the feature count inside of a bounding box and highlight all of the buildings in the box.*/public class FeatureCountActivity extends AppCompatActivity { private MapView mapView; @Overrideprotected 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_count); // Define our views, ones the center box and the others our view container used for the// snackbar.final View selectionBox = findViewById(R.id.selection_box);final View viewContainer = findViewById(R.id.query_feature_count_map_container); mapView = findViewById(R.id.mapView);mapView.onCreate(savedInstanceState);mapView.getMapAsync(new OnMapReadyCallback() {@Overridepublic void onMapReady(@NonNull final MapboxMap mapboxMap) { mapboxMap.setStyle(Style.LIGHT, new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull final Style style) { style.addSource(new GeoJsonSource("highlighted-shapes-source")); // add a layer to the map that highlights the maps buildings inside the bounding box.style.addLayer(new FillLayer("highlighted-shapes-layer", "highlighted-shapes-source").withProperties(fillColor(Color.parseColor("#50667F")))); // Toast instructing user to tap on the boxToast.makeText(FeatureCountActivity.this,getString(R.string.tap_on_feature_box_instruction),Toast.LENGTH_LONG).show(); selectionBox.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {// Perform feature query within the selectionBox. The bounding box is// calculated using the view but you can also use a map bounding box made up// of latitudes and longitudes.int top = selectionBox.getTop() - mapView.getTop();int left = selectionBox.getLeft() - mapView.getLeft();RectF box = new RectF(left, top, left + selectionBox.getWidth(), top + selectionBox.getHeight());List<Feature> features = mapboxMap.queryRenderedFeatures(box, "building"); // Show the features countSnackbar.make(viewContainer,String.format(getString(R.string.feature_count_snackbar_feature_size), features.size()),Snackbar.LENGTH_LONG).show(); GeoJsonSource source = style.getSourceAs("highlighted-shapes-source");if (source != null) {source.setGeoJson(FeatureCollection.fromFeatures(features));}}});}});}});} @Overridepublic void onResume() {super.onResume();mapView.onResume();} @Overrideprotected void onStart() {super.onStart();mapView.onStart();} @Overrideprotected void onStop() {super.onStop();mapView.onStop();} @Overridepublic void onPause() {super.onPause();mapView.onPause();} @Overridepublic void onLowMemory() {super.onLowMemory();mapView.onLowMemory();} @Overrideprotected void onDestroy() {super.onDestroy();mapView.onDestroy();} @Overrideprotected void onSaveInstanceState(Bundle outState) {super.onSaveInstanceState(outState);mapView.onSaveInstanceState(outState);}}