如何在谷歌地圖Android API創建路線

Question

我使用SupportMapFragment創建一個簡單的地圖應用程序，現在想在其上顯示一個路線。 GoogleSamples只有一個例子，它用Polygon繪制一條線，但它沒有創建正確的方法，只有兩點之間的簡單線:(如何在街道和道路上制作嚴格的路線？

Answer 1

遺憾的是，無法使用Google Maps API v2自動創建點到點之間的路線。 但是，您可以使用Google方向API： https ： //developers.google.com/maps/documentation/directions/

結果，您將能夠自己繪制路線。

Answer 2

如果有任何錯誤而不是抱歉......我不確定，但這種方法會幫助你......

    public class RouteOverlay extends Overlay {
    /** GeoPoints representing this routePoints. **/
    private final List<GeoPoint> routePoints;
    /** Colour to paint routePoints. **/
    private int colour;
    /** Alpha setting for route overlay. **/
    private static final int ALPHA = 120;
    /** Stroke width. **/
    private static final float STROKE = 4.5f;
    /** Route path. **/
    private final Path path;
    /** Point to draw with. **/
    private final Point p;
    /** Paint for path. **/
    private final Paint paint;


    /**
     * Public constructor.
     * 
     * @param route Route object representing the route.
     * @param defaultColour default colour to draw route in.
     */

    public RouteOverlay(final Route route, final int defaultColour) {
            super();
            routePoints = route.getPoints();
            colour = defaultColour;
            path = new Path();
            p = new Point();
            paint = new Paint();
    }

    @Override
    public final void draw(final Canvas c, final MapView mv,
                    final boolean shadow) {
            super.draw(c, mv, shadow);

            paint.setColor(colour);
            paint.setAlpha(ALPHA);
            paint.setAntiAlias(true);
            paint.setStrokeWidth(STROKE);
            paint.setStyle(Paint.Style.STROKE);

            redrawPath(mv);
            c.drawPath(path, paint);
    }

    /**
     * Set the colour to draw this route's overlay with.
     * 
     * @param c  Int representing colour.
     */
    public final void setColour(final int c) {
            colour = c;
    }

    /**
     * Clear the route overlay.
     */
    public final void clear() {
            routePoints.clear();
    }

    /**
     * Recalculate the path accounting for changes to
     * the projection and routePoints.
     * @param mv MapView the path is drawn to.
     */

    private void redrawPath(final MapView mv) {
            final Projection prj = mv.getProjection();
            path.rewind();
            final Iterator<GeoPoint> it = routePoints.iterator();
            prj.toPixels(it.next(), p);
            path.moveTo(p.x, p.y);
            while (it.hasNext()) {
                    prj.toPixels(it.next(), p);
                    path.lineTo(p.x, p.y);
            }
            path.setLastPoint(p.x, p.y);
    }

}