【发布时间】：2020-09-30 00:28:47
【问题描述】：
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公共类 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(newView.OnClickListener() { @覆盖 public void onClick（查看视图）{ 意图意图 = 新 PlaceAutocomplete.IntentBuilder() .accessToken(Mapbox.getAccessToken() != null ? Mapbox.getAccessToken() : getString(R.string.access_token)) .placeOptions(PlaceOptions.builder() .backgroundColor(Color.parseColor("#EEEEEE")) .limit(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); } navigationMapRoute.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); } }
【问题讨论】：