SymbolLayerクラスタリング
<?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="com.mapbox.mapboxandroiddemo.examples.dds.ImageClusteringActivity"> <com.mapbox.mapboxsdk.maps.MapViewandroid:id="@+id/mapView"android:layout_width="match_parent"android:layout_height="match_parent"mapbox:mapbox_cameraTargetLat="2.69719"mapbox:mapbox_cameraTargetLng="126.355705"mapbox:mapbox_cameraZoom="4.119118"/> </FrameLayout>
ImageClusteringActivity.java
package com.mapbox.mapboxandroiddemo.examples.dds; import android.graphics.Color;import android.os.Bundle;import android.widget.Toast; 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.expressions.Expression;import com.mapbox.mapboxsdk.style.layers.SymbolLayer;import com.mapbox.mapboxsdk.style.sources.GeoJsonOptions;import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;import com.mapbox.mapboxsdk.utils.BitmapUtils; import java.net.URI;import java.net.URISyntaxException; import androidx.annotation.NonNull;import androidx.appcompat.app.AppCompatActivity;import timber.log.Timber; import static com.mapbox.mapboxsdk.style.expressions.Expression.all;import static com.mapbox.mapboxsdk.style.expressions.Expression.division;import static com.mapbox.mapboxsdk.style.expressions.Expression.get;import static com.mapbox.mapboxsdk.style.expressions.Expression.gte;import static com.mapbox.mapboxsdk.style.expressions.Expression.has;import static com.mapbox.mapboxsdk.style.expressions.Expression.literal;import static com.mapbox.mapboxsdk.style.expressions.Expression.lt;import static com.mapbox.mapboxsdk.style.expressions.Expression.toNumber;import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconImage;import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconSize;import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.textAllowOverlap;import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.textColor;import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.textField;import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.textIgnorePlacement;import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.textOffset;import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.textSize; /*** Use GeoJson data with SymbolLayers to create a data clustering effect.*/public class ImageClusteringActivity extends AppCompatActivity implements OnMapReadyCallback { 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_dds_image_clustering);mapView = findViewById(R.id.mapView);mapView.onCreate(savedInstanceState);mapView.getMapAsync(this);} @Overridepublic void onMapReady(@NonNull MapboxMap mapboxMap) {mapboxMap.setStyle(Style.LIGHT, new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) {initLayerIcons(style);addClusteredGeoJsonSource(style);Toast.makeText(ImageClusteringActivity.this, R.string.zoom_map_in_and_out_instruction,Toast.LENGTH_SHORT).show();}});} private void initLayerIcons(@NonNull Style loadedMapStyle) {loadedMapStyle.addImage("single-quake-icon-id", BitmapUtils.getBitmapFromDrawable(getResources().getDrawable(R.drawable.single_quake_icon)));loadedMapStyle.addImage("quake-triangle-icon-id", BitmapUtils.getBitmapFromDrawable(getResources().getDrawable(R.drawable.earthquake_triangle)));} private void addClusteredGeoJsonSource(@NonNull Style loadedMapStyle) {// Add a new source from the GeoJSON data and set the 'cluster' option to true.try {loadedMapStyle.addSource(// Point to GeoJSON data. This example visualizes all M1.0+ earthquakes from// 12/22/15 to 1/21/16 as logged by USGS' Earthquake hazards program.new GeoJsonSource("earthquakes",new URI("https://www.mapbox.com/mapbox-gl-js/assets/earthquakes.geojson"),new GeoJsonOptions().withCluster(true).withClusterMaxZoom(14).withClusterRadius(50)));} catch (URISyntaxException uriSyntaxException) {Timber.e("Check the URL %s" , uriSyntaxException.getMessage());} //Creating a SymbolLayer icon layer for single data/icon pointsloadedMapStyle.addLayer(new SymbolLayer("unclustered-points", "earthquakes").withProperties(iconImage("single-quake-icon-id"),iconSize(division(get("mag"), literal(4.0f))))); // Use the earthquakes GeoJSON source to create three point ranges.int[] layers = new int[] {150, 20, 0}; for (int i = 0; i < layers.length; i++) {//Add clusters' SymbolLayers imagesSymbolLayer symbolLayer = new SymbolLayer("cluster-" + i, "earthquakes"); symbolLayer.setProperties(iconImage("quake-triangle-icon-id"));Expression pointCount = toNumber(get("point_count")); // Add a filter to the cluster layer that hides the icons based on "point_count"symbolLayer.setFilter(i == 0? all(has("point_count"),gte(pointCount, literal(layers[i]))) : all(has("point_count"),gte(pointCount, literal(layers[i])),lt(pointCount, literal(layers[i - 1]))));loadedMapStyle.addLayer(symbolLayer);} //Add a SymbolLayer for the cluster data number point countloadedMapStyle.addLayer(new SymbolLayer("count", "earthquakes").withProperties(textField(Expression.toString(get("point_count"))),textSize(12f),textColor(Color.BLACK),textIgnorePlacement(true),// The .5f offset moves the data numbers down a little bit so that they're// in the middle of the triangle cluster imagetextOffset(new Float[] {0f, .5f}),textAllowOverlap(true)));} @Overridepublic void onStart() {super.onStart();mapView.onStart();} @Overridepublic void onResume() {super.onResume();mapView.onResume();} @Overridepublic void onPause() {super.onPause();mapView.onPause();} @Overridepublic void onStop() {super.onStop();mapView.onStop();} @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);}}