Mapbox（android）不显示方向

Question

作为用户，我想使用一个安卓应用程序来使用路线在地图中导航。一旦我确定了路线，我会开发其他方式来组织导航，但到目前为止，我还不能在我的地图中显示路线。

我正在使用 Mapbox 自己提供的本教程：https://www.mapbox.com/android-sdk/examples/directions/。没有消息错误，事实上，在我访问地图视图后，显示路线距离的 toast 消息是可见的。 ("Route is 0.0 meters long.") 我检查了日志，通用 HTML 代码是 200（没关系），调试消息显示 0.0 米长的路线。除此之外，日志中没有发现任何错误。

我已经仔细检查了一周的代码是否有任何错误，但我没有发现任何可能导致错误不显示路线的东西。我也调试了代码，它可以毫无问题地到达 drawRoute 函数，我也检查了令牌，它工作得很好。

我做了什么不显示路线？非常感谢！

Image example when you try to see a route.

Java 代码：

public class Mapa extends Activity {
private static final String TAG = "Mapa"; //Tag para usar no log de debug e error

private MapView mapView;
private MapboxMap map;
private DirectionsRoute currentRoute;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Mapbox usa esse token de acesso atraves de uma conta do mapbox, so precisa ser configurado uma vez!
    MapboxAccountManager.start(this,getString(R.string.access_token));

    // Contem o mapview exposto em XML e precisa ser chamado LOGO APOS o account manager
    setContentView(R.layout.activity_main);

    // Funcao que pede permissao para o usuario no seu celular -- TODO
    PedePermissao();

    // Origem: Rodoviaria
    final Position origin = Position.fromCoordinates(-15.794082, -47.882645);
    // Destino: Reitoria
    final Position destination = Position.fromCoordinates(-15.762604, -47.866611);


    //Configuracao do mapa
    mapView = (MapView) findViewById(R.id.mapView);
    mapView.onCreate(savedInstanceState);
    mapView.getMapAsync(new OnMapReadyCallback() {
        @Override
        public void onMapReady(MapboxMap mapboxMap) {
            map = mapboxMap;

            // Criacao e declaracao do icone
            IconFactory iconFactory = IconFactory.getInstance(Mapa.this);
            Drawable iconDrawable = ContextCompat.getDrawable(Mapa.this, R.drawable.infoicon);
            Icon icon = iconFactory.fromDrawable(iconDrawable);
            Drawable iconeDrawableRota = ContextCompat.getDrawable(Mapa.this, R.drawable.infoicon_rota);
            Icon iconeRota = iconFactory.fromDrawable(iconeDrawableRota);

            //Marcadores das instalacoes
            mapboxMap.addMarker(new MarkerViewOptions()
                    .position(new LatLng(-15.76363, -47.86949))
                    .title("ICC Centro")
                    .snippet(getString(R.string.desc_ICC_Centro))
                    .icon(icon));

            mapboxMap.addMarker(new MarkerViewOptions()
                    .position(new LatLng(-15.7629936, -47.86717415))
                    .title("Reitoria")
                    .snippet(getString(R.string.desc_Reitoria))
                    .icon(icon));

            mapboxMap.addMarker(new MarkerViewOptions()
                    .position(new LatLng(-15.76196106, -47.87008166))
                    .title("FAU")
                    .snippet(getString(R.string.desc_FAU))
                    .icon(icon));

            // Adicionando os marcadores de destino da rota
            mapboxMap.addMarker(new MarkerOptions()
                    .position(new LatLng(origin.getLatitude(), origin.getLongitude()))
                    .title("Origem")
                    .icon(iconeRota));
            mapboxMap.addMarker(new MarkerOptions()
                    .position(new LatLng(destination.getLatitude(), destination.getLongitude()))
                    .title("Destino")
                    .icon(iconeRota));

            try {
                getRoute(origin, destination);
            } catch (ServicesException servicesException) {
                servicesException.printStackTrace();
            }

            //Dados da janela (infowindow) quando clicar em um ponteiro (marker)
            mapboxMap.setInfoWindowAdapter(new MapboxMap.InfoWindowAdapter() {
                    //...
                }
            });
        }
    });
}

private void getRoute(Position origin, Position destination) throws ServicesException {

    MapboxDirections client = new MapboxDirections.Builder()
            .setOrigin(origin)
            .setDestination(destination)
            .setProfile(DirectionsCriteria.PROFILE_DRIVING)
            .setAccessToken(MapboxAccountManager.getInstance().getAccessToken())
            .build();


    client.enqueueCall(new Callback<DirectionsResponse>() {
        @Override
        public void onResponse(Call<DirectionsResponse> call, Response<DirectionsResponse> response) {

            // Voce pode pegar mensagens de erro genericas do http sobre o response

            Log.d(TAG, "Codigo de resposta: " + response.code());
            if (response.body() == null) {
                Log.e(TAG, "Sem rotas encontradas, porém sem o uso do token, verifique o token de acesso");
                return;
            } else if (response.body().getRoutes().size() < 1) {
                Log.e(TAG, "Sem rotas encontradas!");
                return;
            }

            // Printa algumas informacoes sobre a rota
            currentRoute = response.body().getRoutes().get(0);
            Log.d(TAG, "Distancia: " + currentRoute.getDistance());
            Toast.makeText(
                    Mapa.this,
                    "A rota tem " + currentRoute.getDistance() + " metros de distância.",
                    Toast.LENGTH_SHORT).show();

            // Desenhar a rota no mapa
            drawRoute(currentRoute);
        }

        @Override
        public void onFailure(Call<DirectionsResponse> call, Throwable throwable) {
            Log.e(TAG, "Erro: " + throwable.getMessage());
            Toast.makeText(Mapa.this, "Erro: " + throwable.getMessage(), Toast.LENGTH_SHORT).show();
        }
    });
}

private void drawRoute(DirectionsRoute route) {

    // Converter as coordenadas LineString em LatLng[]
    LineString lineString = LineString.fromPolyline(route.getGeometry(), Constants.OSRM_PRECISION_V5);
    List<Position> coordinates = lineString.getCoordinates();
    LatLng[] points = new LatLng[coordinates.size()];
    for (int i = 0; i < coordinates.size(); i++) {
        points[i] = new LatLng(
                coordinates.get(i).getLatitude(),
                coordinates.get(i).getLongitude());
    }

    // Escrever os pontos no MapView
    map.addPolyline(new PolylineOptions()
            .add(points)
            .color(Color.parseColor("#009688"))
            .width(5));
}

Answer 1

您的坐标顺序不正确。虽然LatLng 是按latitude, longitude 顺序创建的，但Position 是xy 顺序或longitude, latitude。所以你的出发地和目的地应该是：

// Origem: Rodoviaria
final Position origin = Position.fromCoordinates(-47.882645, -15.794082);
// Destino: Reitoria
final Position destination = Position.fromCoordinates(-47.866611, -15.762604);