java - 如何在使用mapbox搜索时获取出发点和目的地点

Question

1. 公共(public)类 MainActivity 扩展 AppCompatActivity 实现OnMapReadyCallback、PermissionsListener {

   private static final int REQUEST_CODE_AUTOCOMPLETE = 1;
   // variables for adding location layer
   private MapView mapView;
   private MapboxMap mapboxMap;
   
   // variables for adding location layer
   private PermissionsManager permissionsManager;
   private LocationComponent locationComponent;
   
   // variables for calculating and drawing a route
   private DirectionsRoute currentRoute;
   private static final String TAG = "DirectionsActivity";
   private NavigationMapRoute navigationMapRoute;
   
   // variables needed to initialize navigation
   private Button button;
   private CarmenFeature home;
   private CarmenFeature work;
   private String geojsonSourceLayerId = "geojsonSourceLayerId";
   private String symbolIconId = "symbolIconId";
   
   @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_main);
   
       mapView = findViewById(R.id.mapView);
       mapView.onCreate(savedInstanceState);
       mapView.getMapAsync(this);
   }
   
   @Override
   public void onMapReady(@NonNull final MapboxMap mapboxMap) {
       this.mapboxMap = mapboxMap;
       mapboxMap.setStyle(Style.MAPBOX_STREETS, new Style.OnStyleLoaded() {
           @Override
           public void onStyleLoaded(@NonNull Style style) {
   
               enableLocationComponent(style);
               addDestinationIconSymbolLayer(style);
   
               initSearchFab();
   
               addUserLocations();
   
               // Add the symbol layer icon to map for future use
               style.addImage(symbolIconId, BitmapFactory.decodeResource(
                       MainActivity.this.getResources(), R.drawable.mapbox_marker_icon_default));
   
               // Create an empty GeoJSON source using the empty feature collection
               setUpSource(style);
   
               // Set up a new symbol layer for displaying the searched location's feature coordinates
               setupLayer(style);
           }
       });
   }
   
   //search
   private void initSearchFab() {
       findViewById(R.id.fab_location_search).setOnClickListener(new
   

   View.OnClickListener() { @覆盖 公共(public)无效onClick(查看 View ){ 意图意图 = new PlaceAutocomplete.IntentBuilder() .accessToken(Mapbox.getAccessToken() != null ? Mapbox.getAccessToken() : getString(R.string.access_token)) .placeOptions(PlaceOptions.builder() .backgroundColor(Color.parseColor("#EEEEEE")) .限制(10) .addInjectedFeature(主页) .addInjectedFeature(工作) .build(PlaceOptions.MODE_CARDS)) .build(MainActivity.this); startActivityForResult(意图，REQUEST_CODE_AUTOCOMPLETE)； } }); }

   //home and work
   private void addUserLocations() {
       home = CarmenFeature.builder().text("Mapbox SF Office")
               .geometry(Point.fromLngLat(-122.3964485, 37.7912561))
               .placeName("50 Beale St, San Francisco, CA")
               .id("mapbox-sf")
               .properties(new JsonObject())
               .build();
   
       work = CarmenFeature.builder().text("Mapbox DC Office")
               .placeName("740 15th Street NW, Washington DC")
               .geometry(Point.fromLngLat(-77.0338348, 38.899750))
               .id("mapbox-dc")
               .properties(new JsonObject())
               .build();
   }
   
   private void setUpSource(@NonNull Style loadedMapStyle) {
       loadedMapStyle.addSource(new GeoJsonSource(geojsonSourceLayerId));
   }
   
   private void setupLayer(@NonNull Style loadedMapStyle) {
       loadedMapStyle.addLayer(new SymbolLayer("SYMBOL_LAYER_ID", geojsonSourceLayerId).withProperties(
               iconImage(symbolIconId),
               iconOffset(new Float[] {0f, -8f})
       ));
   }
   
   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       super.onActivityResult(requestCode, resultCode, data);
       if (resultCode == Activity.RESULT_OK && requestCode == REQUEST_CODE_AUTOCOMPLETE) {
   
           // Retrieve selected location's CarmenFeature
           CarmenFeature selectedCarmenFeature = PlaceAutocomplete.getPlace(data);
   
           // Create a new FeatureCollection and add a new Feature to it using selectedCarmenFeature above.
           // Then retrieve and update the source designated for showing a selected location's symbol layer icon
   
           if (mapboxMap != null) {
               Style style = mapboxMap.getStyle();
               if (style != null) {
                   GeoJsonSource source = style.getSourceAs(geojsonSourceLayerId);
                   if (source != null) {
                       source.setGeoJson(FeatureCollection.fromFeatures(
                               new Feature[] {Feature.fromJson(selectedCarmenFeature.toJson())}));
                   }
   
                   // Move map camera to the selected location
                   mapboxMap.animateCamera(CameraUpdateFactory.newCameraPosition(
                           new CameraPosition.Builder()
                                   .target(new LatLng(((Point) selectedCarmenFeature.geometry()).latitude(),
                                           ((Point) selectedCarmenFeature.geometry()).longitude()))
                                   .zoom(14)
                                   .build()), 4000);
               }
           }
       }
   }
   
   
   //getRoute
   private void getRoute(Point origin, Point destination)
   {
       NavigationRoute.builder(this)
               .accessToken(Mapbox.getAccessToken())
               .origin(origin)
               .destination(destination)
               .build()
               .getRoute(new Callback<DirectionsResponse>()
               {
                   //onResponse
                   @Override
                   public void onResponse(Call<DirectionsResponse> call, Response<DirectionsResponse> response)
                   {
                       // You can get the generic HTTP info about the response
                       Log.d(TAG, "Response code: " + response.code());
                       if (response.body() == null)
                       {
                           Log.e(TAG, "No routes found, make sure you set the right user and access token.");
                           return;
                       }
                       else if (response.body().routes().size() < 1)
                       {
                           Log.e(TAG, "No routes found");
                           return;
                       }
   
                       currentRoute = response.body().routes().get(0);
   
                       // Draw the route on the map
                       if (navigationMapRoute != null)
                       {
                           navigationMapRoute.removeRoute();
                       }
                       else
                       {
                           navigationMapRoute = new NavigationMapRoute(null, mapView, mapboxMap,
   

   R.style.NavigationMapRoute); } 导航MapRoute.addRoute(currentRoute); }//onResponse 结束

                   //onFailure
                   @Override
                   public void onFailure(Call<DirectionsResponse> call, Throwable throwable)
                   {
                       Log.e(TAG, "Error: " + throwable.getMessage());
                   }//end of onFailure
               });
   }//end of getRoute
   
   //addDestinationIconSymbolLayer
   private void addDestinationIconSymbolLayer(@NonNull Style loadedMapStyle)
   {
       loadedMapStyle.addImage("destination-icon-id",
               BitmapFactory.decodeResource(this.getResources(), R.drawable.mapbox_marker_icon_default));
       GeoJsonSource geoJsonSource = new GeoJsonSource("destination-source-id");
       loadedMapStyle.addSource(geoJsonSource);
       SymbolLayer destinationSymbolLayer = new SymbolLayer("destination-symbol-layer-id", "destination-source-id");
       destinationSymbolLayer.withProperties(
               iconImage("destination-icon-id"),
               iconAllowOverlap(true),
               iconIgnorePlacement(true)
       );
       loadedMapStyle.addLayer(destinationSymbolLayer);
   }//end of addDestinationIconSymbolLayer
   
   //enableLocationComponent
   @SuppressWarnings({"MissingPermission"})
   private void enableLocationComponent(@NonNull Style loadedMapStyle)
   {
       // Check if permissions are enabled and if not request
       if (PermissionsManager.areLocationPermissionsGranted(this))
       {
           // Activate the MapboxMap LocationComponent to show user location
           // Adding in LocationComponentOptions is also an optional parameter
           locationComponent = mapboxMap.getLocationComponent();
           locationComponent.activateLocationComponent(this, loadedMapStyle);
           locationComponent.setLocationComponentEnabled(true);
           // Set the component's camera mode
           locationComponent.setCameraMode(CameraMode.TRACKING);
       }
       else
       {
           permissionsManager = new PermissionsManager(this);
           permissionsManager.requestLocationPermissions(this);
       }
   }//end of enableLocationComponent
   
   //onRequestPermissionsResult
   @Override
   public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults)
   {
       permissionsManager.onRequestPermissionsResult(requestCode, permissions, grantResults);
   }//end of onRequestPermissionsResult
   
   //onExplanationNeeded
   @Override
   public void onExplanationNeeded(List<String> permissionsToExplain)
   {
       Toast.makeText(this, R.string.user_location_permission_explanation,
   

   Toast.LENGTH_LONG).show(); }//onExplanationNeeded 结束

   //onPermissionResult
   @Override
   public void onPermissionResult(boolean granted)
   {
       if (granted)
       {
           enableLocationComponent(mapboxMap.getStyle());
       }
       else
       {
           Toast.makeText(this, R.string.user_location_permission_not_granted,
   

   Toast.LENGTH_LONG).show(); 结束(); } }//onPermissionResult 结束

   // Add the mapView lifecycle to the activity's lifecycle methods
   @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();
       mapView.onDestroy();
   }
   
   @Override
   protected void onSaveInstanceState(Bundle outState) {
       super.onSaveInstanceState(outState);
       mapView.onSaveInstanceState(outState);
   } }
   

Answer 1

您能详细说明一下您希望实现什么目标吗？

出发地和目的地只是 map 上的两个位置。您可以通过多种方式检索这些内容。您可以通过单击 map 来选择它们，将地址输入到地理编码器中，地理编码器会将地址转换为地理位置。因此您可以利用Mapbox Places Plugin.

此示例允许您通过单击 map 来选择 map 的功能。您可以调整它并返回地理位置，您可以将其用作目的地:https://docs.mapbox.com/android/maps/examples/query-a-map-feature/

您可以使用 Mapbox locationComponent 并检索当前设备位置，您可以将其用作原点。请参阅此示例:https://docs.mapbox.com/android/maps/examples/show-a-users-location/

在下面的代码片段中，您可以使用位置 loc 作为源:

      private void enableLocationComponent(@NonNull Style loadedMapStyle) {

        if (PermissionsManager.areLocationPermissionsGranted(this)) {

           LocationComponent locationComponent = map.getLocationComponent();
           Location loc = locationComponent.getLastKnownLocation();