2

我想在谷歌地图上绘制一条路线，并使用 GPS 改变我的位置。随着我的位置发生变化（当创建新的地理点时），点在谷歌地图上移动，但我无法在地图上画线。

请帮助在谷歌地图上绘制路线。下面是我的代码

`

LocationManager locman;
LocationListener loclis;
Location location;
private MapView map;

List<GeoPoint> geoPointsArray = new ArrayList<GeoPoint>();
private MapController controller;
String provider = LocationManager.GPS_PROVIDER;
double lat;
double lon;


@Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      initMapView();
      initMyLocation();
      locman = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
      //locman.requestLocationUpdates(provider,60000, 100,loclis);
      //Location = locman.getLastKnownLocation(provider);

   }
/** Find and initialize the map view. */
   private void initMapView() {
      map = (MapView) findViewById(R.id.mapView);
      controller = map.getController();
      map.setSatellite(false);
      map.setBuiltInZoomControls(true);
   }

   /** Find Current Position on Map. */
   private void initMyLocation() {
      final MyLocationOverlay overlay = new MyLocationOverlay(this, map);
      overlay.enableMyLocation();
      overlay.enableCompass(); // does not work in emulator
      overlay.runOnFirstFix(new Runnable() {
         public void run() {
            // Zoom in to current location
            controller.setZoom(16);
            controller.animateTo(overlay.getMyLocation());
         }
      });
      map.getOverlays().add(overlay);
   }

public void onLocationChanged(Location location) {
    if (location != null){
        lat = location.getLatitude();
        lon = location.getLongitude();
        GeoPoint New_geopoint = new GeoPoint((int)(lat*1e6),(int)(lon*1e6));
        controller.animateTo(New_geopoint);

    }

}
class MyOverlay extends Overlay{
    public MyOverlay(){
    }   
    public void draw(Canvas canvas, MapView mapv, boolean shadow){
    super.draw(canvas, mapv, shadow);
    Paint paint;
    paint = new Paint();
    paint.setColor(Color.GREEN);

    paint.setAntiAlias(true);
    paint.setStyle(Style.STROKE);
    paint.setStrokeWidth(3);

        Projection projection = map.getProjection();
        Path p = new Path();
        for (int i = 0; i < geoPointsArray.size(); i++) {
            if (i == geoPointsArray.size() - 1) {
                break;
            }
        Point from = new Point();
        Point to = new Point();
        projection.toPixels(geoPointsArray.get(i), from);
        projection.toPixels(geoPointsArray.get(i + 1), to);
        p.moveTo(from.x, from.y);

        canvas.drawLine(from.x, from.y, to.x, to.y, paint);

        //p.lineTo(to.x, to.y);
        }
    }   
 }

`

4

2 回答 2

1

你为什么不画一条折线？您只需要 LatLng 实例。

var flightPlanCoordinates = [
    new google.maps.LatLng(43.290307,-2.884174),
    new google.maps.LatLng(41.3973,2.158964),
    new google.maps.LatLng(40.462046,-3.809694),
    new google.maps.LatLng(38.976895,-1.858366)
];

var flightPath = new google.maps.Polyline({
    path: flightPlanCoordinates,
    strokeColor: "#FF0000",
    strokeOpacity: 1.0,
    strokeWeight: 2
});
flightPath.setMap( map );
于 2012-05-28T14:55:56.980 回答
0

我很久以前写了这段代码，所以请原谅我，它可以清理很多，但我相信它应该满足你的需要。

public class RouteSegmentOverlay extends Overlay {
private Paint paint;
private ArrayList<GeoPoint> routePoints;
private boolean routeIsActive;  
private int numberRoutePoints;


private Path path;

// Constructor permitting the route array to be passed as an argument.
public RouteSegmentOverlay(ArrayList<GeoPoint> routePoints) {
    this.routePoints = routePoints;
    numberRoutePoints  = routePoints.size();
    routeIsActive = true;
}

// Method to turn route display on and off
public void setRouteView(boolean routeIsActive){
    this.routeIsActive = routeIsActive;
}

public void setColor(int c){
    color = c;
}

private int color = 0;

Paint.Style paintStyle = Paint.Style.STROKE;

public void setFillStyle(Paint.Style style){
    paintStyle = style;
}

@Override
public void draw(Canvas canvas, MapView mapview, boolean shadow) {
    super.draw(canvas, mapview, shadow);
    if(! routeIsActive) return;


    if(paint==null){
        paint = new Paint();

        paint.setAntiAlias(true);
        paint.setStrokeWidth(7);
        paint.setStyle(paintStyle);
        paint.setAntiAlias(true);
        paint.setARGB(255, 0, 0, 255);
        paint.setColor(color);
    }

    if(bitmap==null){

        wMin = Integer.MAX_VALUE;
        wMax = Integer.MIN_VALUE;
        hMin = Integer.MAX_VALUE;
        hMax = Integer.MIN_VALUE;

        lonMin = Integer.MAX_VALUE;
        lonMax = Integer.MIN_VALUE;
        latMin = Integer.MAX_VALUE;
        latMax = Integer.MIN_VALUE;

        Boolean newSegment = true;
        Point pt = new Point();

        GeoPoint point = null;

        ArrayList<Point> points = new ArrayList<Point>();

        for(int i=0; i<numberRoutePoints; i++){

            point = routePoints.get(i);

            int tempLat = point.getLatitudeE6();
            int tempLon = point.getLongitudeE6();

            if(tempLon<lonMin)lonMin = tempLon;
            if(tempLon>lonMax)lonMax = tempLon;
            if(tempLat<latMin)latMin = tempLat;
            if(tempLat>latMax)latMax = tempLat;

            mapview.getProjection().toPixels(routePoints.get(i), pt);

            points.add(new Point(pt.x,pt.y));

            if(pt.x<wMin)wMin = pt.x;
            if(pt.x>wMax)wMax = pt.x;
            if(pt.y<hMin)hMin = pt.y;
            if(pt.y>hMax)hMax = pt.y;

        }

        topLeftIn = new GeoPoint(latMax, lonMin);
        bottomRightIn = new GeoPoint(latMin, lonMax);
        int width = (wMax-wMin);
        int height = (hMax-hMin);           

        bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_4444);
        Canvas c = new Canvas(bitmap);

        Path bitmapPath = new Path();
        bitmapPath.incReserve(numberRoutePoints);

        newSegment = true;
        for(Point p : points){

            if (newSegment) {
                bitmapPath.moveTo(p.x - wMin, p.y - hMin);
                newSegment = false;
              } else {
                bitmapPath.lineTo(p.x - wMin, p.y - hMin);
              }

        }
        c.drawPath(bitmapPath, paint);

    }
    mapview.getProjection().toPixels(topLeftIn, topLeftOut);
    mapview.getProjection().toPixels(bottomRightIn, bottomRightOut);

    int l = topLeftOut.x;
    int t = topLeftOut.y;
    int r = bottomRightOut.x;
    int b = bottomRightOut.y; 

    Rect rect = new Rect(l,t,r,b);

    canvas.drawBitmap(bitmap, new Rect(0,0,bitmap.getWidth(),bitmap.getHeight()),rect,null);

}
GeoPoint topLeftIn = null;
GeoPoint bottomRightIn = null;
Point topLeftOut = new Point();
Point bottomRightOut = new Point();

Bitmap bitmap = null;
int wMin = Integer.MAX_VALUE;
int wMax = 0;
int hMin = Integer.MAX_VALUE;
int hMax = 0;

int lonMin = Integer.MAX_VALUE;
int lonMax = 0;
int latMin = Integer.MAX_VALUE;
int latMax = 0;

}
于 2012-05-28T16:16:15.510 回答