関数を使用した線のスタイル設定
<?xml version="1.0" encoding="utf-8"?><FrameLayoutxmlns: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.StyleLineIdentityPropertyActivity"> <com.mapbox.mapboxsdk.maps.MapViewandroid:id="@+id/mapView"android:layout_width="match_parent"android:layout_height="match_parent"mapbox:mapbox_cameraTargetLat="37.82882682974591"mapbox:mapbox_cameraTargetLng="-122.48383155304096"mapbox:mapbox_cameraZoom="15.3"/> </FrameLayout>
StyleLineIdentityPropertyActivity.java
package com.mapbox.mapboxandroiddemo.examples.dds; import android.os.Bundle; 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.LineLayer;import com.mapbox.mapboxsdk.style.layers.Property;import com.mapbox.mapboxsdk.style.layers.PropertyFactory;import com.mapbox.mapboxsdk.style.sources.GeoJsonSource; 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.get;import static com.mapbox.mapboxsdk.style.expressions.Expression.match;import static com.mapbox.mapboxsdk.style.expressions.Expression.rgb;import static com.mapbox.mapboxsdk.style.expressions.Expression.stop; /*** Use data-driven styling to set a line's color based on imported GeoJSON.*/public class StyleLineIdentityPropertyActivity 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_style_line); mapView = findViewById(R.id.mapView);mapView.onCreate(savedInstanceState);mapView.getMapAsync(new OnMapReadyCallback() {@Overridepublic void onMapReady(@NonNull final MapboxMap mapboxMap) { mapboxMap.setStyle(Style.MAPBOX_STREETS, new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) {try {// Retrieve GeoJSON from local file and add it to the mapstyle.addSource(new GeoJsonSource("lines",new URI("asset://golden_gate_lines.geojson")));} catch (URISyntaxException exception) {Timber.d(exception);} // Create a LineLayer. Use lineColor and stops to draw red and blue lines on the mapstyle.addLayer(new LineLayer("finalLines", "lines").withProperties(PropertyFactory.lineColor(match(get("color"), rgb(0, 0, 0),stop("red", rgb(247, 69, 93)),stop("blue", rgb(51, 201, 235)))),PropertyFactory.visibility(Property.VISIBLE),PropertyFactory.lineWidth(3f)));}});}});} @Overrideprotected void onStart() {super.onStart();mapView.onStart();} @Overridepublic void onResume() {super.onResume();mapView.onResume();} @Overridepublic void onPause() {super.onPause();mapView.onPause();} @Overrideprotected 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);}}