レイヤの透明度の調整
<?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=".examples.styles.AdjustLayerOpacityActivity"> <com.mapbox.mapboxsdk.maps.MapViewandroid:id="@+id/mapView"android:layout_width="match_parent"android:layout_height="match_parent"mapbox:mapbox_cameraTargetLat="41.8362"mapbox:mapbox_cameraTargetLng="-87.6321"mapbox:mapbox_cameraZoom="9.5"mapbox:mapbox_cameraZoomMax="13"mapbox:mapbox_cameraZoomMin="7"mapbox:mapbox_uiCompassMarginTop="75dp"/> <LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"android:layout_gravity="top"android:layout_marginTop="24dp"android:paddingStart="24dp"android:paddingLeft="24dp"android:paddingTop="24dp"android:paddingEnd="24dp"android:paddingRight="24dp"android:paddingBottom="10dp"> <TextViewandroid:id="@+id/textview_opacity_value"android:layout_width="45dp"android:layout_height="wrap_content"android:text="100%"/> <SeekBarandroid:id="@+id/seek_bar_layer_opacity"android:layout_width="match_parent"android:layout_height="wrap_content"android:max="100"android:progress="100"/> </LinearLayout> </FrameLayout>
AdjustLayerOpacityActivity.java
package com.mapbox.mapboxandroiddemo.examples.styles; import android.os.Bundle;import androidx.annotation.NonNull;import androidx.appcompat.app.AppCompatActivity;import android.widget.SeekBar;import android.widget.TextView; 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.Layer;import com.mapbox.mapboxsdk.style.layers.RasterLayer;import com.mapbox.mapboxsdk.style.sources.RasterSource; import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.rasterOpacity; /*** Use a seekbar to adjust the opacity of a raster layer on top of a map.*/public class AdjustLayerOpacityActivity extends AppCompatActivity { private MapView mapView;private MapboxMap map;private Layer chicago; @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_adjust_layer_opacity); final SeekBar opacitySeekBar = findViewById(R.id.seek_bar_layer_opacity);final TextView percentTextView = findViewById(R.id.textview_opacity_value); opacitySeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {if (chicago != null) {chicago.setProperties(rasterOpacity((float) progress / 100));}String progressPercentage = progress + "%";percentTextView.setText(progressPercentage);} @Overridepublic void onStartTrackingTouch(SeekBar seekBar) { } @Overridepublic void onStopTrackingTouch(SeekBar seekBar) { }}); mapView = findViewById(R.id.mapView);mapView.onCreate(savedInstanceState);mapView.getMapAsync(new OnMapReadyCallback() {@Overridepublic void onMapReady(@NonNull MapboxMap mapboxMap) {map = mapboxMap;mapboxMap.setStyle(Style.LIGHT, new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) {style.addSource(new RasterSource("chicago-source", "mapbox://mapbox.u8yyzaor"));style.addLayer(new RasterLayer("chicago", "chicago-source"));map.getStyle(new Style.OnStyleLoaded() {@Overridepublic void onStyleLoaded(@NonNull Style style) {chicago = style.getLayer("chicago");}});}});}});} @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);}}