在 Android 1.0 上，有一个用于行车路线的 com.google.googlenav 命名空间:
Route - Improved Google Driving Directions
但在较新的 SDK 中，由于某种原因它被删除了...
Android: DrivingDirections removed since API 1.0 - how to do it in 1.5/1.6? 在黑莓上，也缺少此类东西的 API:
how to find the route between two places in Blackberry?

csie-tw 提供了一种解决方法(查询 gmaps 以获取 kml 文件并对其进行解析):
Android - Driving Direction (Route Path)
还有Andrea发了DrivingDirections helper classes安卓版。
我在 j2me 中为此功能编写了一个小助手，因此我想在 Android 和 BlackBerry 上分享我的示例。

更新
正如评论中所述，官方不允许Google Maps APIs Terms of Service :

Google Maps/Google Earth APIs Terms of Service
Last updated: May 27, 2009
...
10. License Restrictions. Except as expressly permitted under the Terms, or unless you have received prior written authorization from Google (or, as applicable, from the provider of particular Content), Google's licenses above are subject to your adherence to all of the restrictions below. Except as explicitly permitted in Section 7 or the Maps APIs Documentation, you must not (nor may you permit anyone else to):
...
10.9 use the Service or Content with any products, systems, or applications for or in connection with:
(a) real time navigation or route guidance, including but not limited to turn-by-turn route guidance that is synchronized to the position of a user's sensor-enabled device;

并且可能会被某些应用程序禁用(不知何故，至少在 Android 上)...来自 Geocode scraping in .NET conversation :

This is not allowed by the API terms of use. You should not scrape Google Maps to generate geocodes. We will block services that do automated queries of our servers.

Bret Taylor
Product Manager, Google Maps

如果有任何替代方案和/或建议，我们将不胜感激!
谢谢!

最佳答案

J2ME map 路线提供者

maps.google.com 有一个导航服务，可以在 KML 中为您提供路线信息。格式。

要获取 kml 文件，我们需要形成带有起始和目标位置的 url:

public static String getUrl(double fromLat, double fromLon,
                            double toLat, double toLon) {// connect to map web service
    StringBuffer urlString = new StringBuffer();
    urlString.append("http://maps.google.com/maps?f=d&hl=en");
    urlString.append("&saddr=");// from
    urlString.append(Double.toString(fromLat));
    urlString.append(",");
    urlString.append(Double.toString(fromLon));
    urlString.append("&daddr=");// to
    urlString.append(Double.toString(toLat));
    urlString.append(",");
    urlString.append(Double.toString(toLon));
    urlString.append("&ie=UTF8&0&om=0&output=kml");
    return urlString.toString();
}

接下来您需要解析 xml(用 SAXParser 实现)并填充数据结构:

public class Point {
    String mName;
    String mDescription;
    String mIconUrl;
    double mLatitude;
    double mLongitude;
}

public class Road {
    public String mName;
    public String mDescription;
    public int mColor;
    public int mWidth;
    public double[][] mRoute = new double[][] {};
    public Point[] mPoints = new Point[] {};
}

Android 和 Blackberry 以不同的方式实现网络连接，因此您必须先形成 url:

 public static String getUrl(double fromLat, double fromLon,
     double toLat, double toLon)

然后用这个url创建连接并获取InputStream。
然后通过这个 InputStream 得到解析后的数据结构:

 public static Road getRoute(InputStream is) 

完整源代码RoadProvider.java

黑莓

class MapPathScreen extends MainScreen {
    MapControl map;
    Road mRoad = new Road();
    public MapPathScreen() {
        double fromLat = 49.85, fromLon = 24.016667;
        double toLat = 50.45, toLon = 30.523333;
        String url = RoadProvider.getUrl(fromLat, fromLon, toLat, toLon);
        InputStream is = getConnection(url);
        mRoad = RoadProvider.getRoute(is);
        map = new MapControl();
        add(new LabelField(mRoad.mName));
        add(new LabelField(mRoad.mDescription));
        add(map);
    }
    protected void onUiEngineAttached(boolean attached) {
        super.onUiEngineAttached(attached);
        if (attached) {
            map.drawPath(mRoad);
        }
    }
    private InputStream getConnection(String url) {
        HttpConnection urlConnection = null;
        InputStream is = null;
        try {
            urlConnection = (HttpConnection) Connector.open(url);
            urlConnection.setRequestMethod("GET");
            is = urlConnection.openInputStream();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return is;
    }
}

在 J2MEMapRouteBlackBerryEx 上查看完整代码在 Google 代码上

安卓

public class MapRouteActivity extends MapActivity {
    LinearLayout linearLayout;
    MapView mapView;
    private Road mRoad;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mapView = (MapView) findViewById(R.id.mapview);
        mapView.setBuiltInZoomControls(true);
        new Thread() {
            @Override
            public void run() {
                double fromLat = 49.85, fromLon = 24.016667;
                double toLat = 50.45, toLon = 30.523333;
                String url = RoadProvider
                        .getUrl(fromLat, fromLon, toLat, toLon);
                InputStream is = getConnection(url);
                mRoad = RoadProvider.getRoute(is);
                mHandler.sendEmptyMessage(0);
            }
        }.start();
    }

    Handler mHandler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            TextView textView = (TextView) findViewById(R.id.description);
            textView.setText(mRoad.mName + " " + mRoad.mDescription);
            MapOverlay mapOverlay = new MapOverlay(mRoad, mapView);
            List<Overlay> listOfOverlays = mapView.getOverlays();
            listOfOverlays.clear();
            listOfOverlays.add(mapOverlay);
            mapView.invalidate();
        };
    };

    private InputStream getConnection(String url) {
        InputStream is = null;
        try {
            URLConnection conn = new URL(url).openConnection();
            is = conn.getInputStream();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return is;
    }
    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }
}

在 J2MEMapRouteAndroidEx 上查看完整代码在 Google 代码上

关于android - J2ME/Android/BlackBerry - 行车路线，两个地点之间的路线，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2023669/