dessiner un cercle autour de ma position

Question

J'essaye de dessiner un cercle autour de ma position. Je ne sais pas ce que je fais mal, mais le cercle s ne montrant pas:

@Override 
public void draw(Canvas canvas, MapView mapView, boolean shadow) { 
    Projection projection = mapView.getProjection(); 

    if (shadow == false && location != null) { 
     // Get the current location 
     Double latitude = location.getLatitude() * 1E6; 
     Double longitude = location.getLongitude() * 1E6; 
     GeoPoint geoPoint = new GeoPoint(latitude.intValue(), 
       longitude.intValue()); 

     int radius = metersToRadius(100, mapView, latitude); 

     // Convert the location to screen pixels 
     Point point = new Point(); 
     projection.toPixels(geoPoint, point); 

     // Setup the paint 
     Paint paint = new Paint(); 
     paint.setAntiAlias(true); 
     paint.setStrokeWidth(2.0f); 

     paint.setColor(0xff6666ff); 
     paint.setStyle(Style.STROKE); 
     canvas.drawCircle(point.x, point.y, radius, paint); 

     paint.setColor(0x186666ff); 
     paint.setStyle(Style.FILL); 
     canvas.drawCircle(point.x, point.y, radius, paint); 
    } 
    super.draw(canvas, mapView, shadow); 
} 

Edit: Juste pour préciser que je vais poster mes cours: CustomItemizedOverlay

public class CustomItemizedOverlay extends ItemizedOverlay<OverlayItem> { 

protected final List<OverlayItem> mOverlays = new ArrayList<OverlayItem>(); 

protected final Context mContext; 

public CustomItemizedOverlay(Drawable defaultMarker, Context context) { 
    super(boundCenterBottom(defaultMarker)); 
    this.mContext = context; 
} 

public void addOverlay(OverlayItem overlay) { 
    mOverlays.add(overlay); 
    populate(); 
} 

@Override 
protected OverlayItem createItem(int i) { 
    // TODO Auto-generated method stub 
    return mOverlays.get(i); 
} 

public void removeOverlay(OverlayItem overlay) { 
    mOverlays.remove(overlay); 
    populate(); 
} 

public void clear() { 
    mOverlays.clear(); 
    populate(); 
} 

@Override 
public int size() { 
    // TODO Auto-generated method stub 
    return mOverlays.size(); 
} 

@Override 
protected boolean onTap(int i) { 
    OverlayItem itemClicked = this.mOverlays.get(i); 

    AlertDialog.Builder builder = new AlertDialog.Builder(this.mContext); 

    builder.setTitle(itemClicked.getTitle()); 
    builder.setMessage(itemClicked.getSnippet()); 
    builder.setCancelable(true); 

    AlertDialog alert = builder.create(); 
    alert.show(); 

    return true; 
} 

Et PcCustomizedOverlay

public class PcCustomItemizedOverlay extends CustomItemizedOverlay { 

public static int metersToRadius(float meters, MapView map, double latitude) { 
    return (int) (map.getProjection().metersToEquatorPixels(meters) * (1/Math 
      .cos(Math.toRadians(latitude)))); 
} 

private Location location; 

public PcCustomItemizedOverlay(Drawable defaultMarker, Context context) { 
    super(defaultMarker, context); 
} 

@Override 
public void draw(Canvas canvas, MapView mapView, boolean shadow) { 
    Projection projection = mapView.getProjection(); 

    if (shadow == false && location != null) { 
     // Get the current location 
     Double latitude = location.getLatitude() * 1E6; 
     Double longitude = location.getLongitude() * 1E6; 
     GeoPoint geoPoint = new GeoPoint(latitude.intValue(), 
       longitude.intValue()); 

     int radius = metersToRadius(40, mapView, latitude); 

     // Convert the location to screen pixels 
     Point point = new Point(); 
     projection.toPixels(geoPoint, point); 

     // Setup the paint 
     Paint paint = new Paint(); 
     paint.setAntiAlias(true); 
     paint.setStrokeWidth(2.0f); 

     paint.setColor(0xff6666ff); 
     paint.setStyle(Style.STROKE); 
     canvas.drawCircle(point.x, point.y, radius, paint); 

     paint.setColor(0x186666ff); 
     paint.setStyle(Style.FILL); 
     canvas.drawCircle(point.x, point.y, radius, paint); 
    } 
    super.draw(canvas, mapView, shadow); 
} 

public Location getLocation() { 
    return location; 
} 

public void setLocation(Location location) { 
    this.location = location; 
} 

}

est-ce que quelqu'un sait où est le problème?

Merci beaucoup

Answer 1

Je pense que votre problème dans void draw.

@Override 
public void draw(Canvas canvas, MapView mapView, boolean shadow) { 
    super.draw(canvas, mapView, shadow); 
    Projection projection = mapView.getProjection(); 

    if (shadow == false && location != null) { 
     // Get the current location 
     Double latitude = location.getLatitude() * 1E6; 
     Double longitude = location.getLongitude() * 1E6; 
     GeoPoint geoPoint = new GeoPoint(latitude.intValue(), 
       longitude.intValue()); 

     int radius = metersToRadius(100, mapView, latitude); 

     // Convert the location to screen pixels 
     Point point = new Point(); 
     projection.toPixels(geoPoint, point); 

     // Setup the paint 
     Paint paint = new Paint(); 
     paint.setAntiAlias(true); 
     paint.setStrokeWidth(2.0f); 

     paint.setColor(0xff6666ff); 
     paint.setStyle(Style.STROKE); 
     canvas.drawCircle(point.x, point.y, radius, paint); 

     paint.setColor(0x186666ff); 
     paint.setStyle(Style.FILL); 
     canvas.drawCircle(point.x, point.y, radius, paint); 
    } 

} 

Regardez ici aussi pour mettre l'image sur votre carte. drawing image as mapoverlay

Answer 2

essayer ce code

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    mapView = (MapView) findViewById(R.id.mapview); 
    MapController mc = mapView.getController(); 
    MyLocationOverlay myLocationOverlay = new MyLocationOverlay(MainMap.this, mapView); 
    mapView.getOverlays().add(myLocationOverlay); 
    mc.animateTo(new GeoPoint(lat, lng)); 
    mc.setZoom(15); 
    mapView.invalidate(); 
} 

Ne pas oublier d'ajouter overlay.enableMyLocation(); dans onresume() et overlay.disableMyLocation(); dans le pause

au lieu du code ci-dessus si vous voulez dessiner cercle autour de vous point vous pouvez utiliser exemple de code:

Point screenPnts =new Point(); 
GeoPoint curr_geopoint = new GeoPoint((int)(location.getLatitude()*1E6),(int)(location.getLongitude()*1E6)); 
mapview.getProjection().toPixels(curr_geopoint, screenPnts); 
canvas.drawCircle(screenPnts.x, screenPnts.y, 15, paint); 

faire quelques essais & erreur pour obtenir ce cercle autour du point en manipulant screenPnts Valeurs .x et screenPnts.y. ici la peinture est l'objet de la classe Paint pour donner la couleur au cercle

Answer 3

J'ai eu un problème similaire.

Résolu avec un dessin booléen prioritaire au lieu d'un dessin vide dans la classe interne qui étendait la superposition.

Il ressemblerait à ceci:

//inner class MapOverlay 
class MapOverlay extends com.google.android.maps.Overlay 
{ 
    @Override 
    public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when) 
    { 
     super.draw(canvas, mapView, shadow);     

     Projection projection = mapView.getProjection(); 

     //the rest of your code here................ 

     super.draw(canvas,mapView,shadow); 

     return true; 
    } 
} 

construire votre cercle avec

MapOverlay mapOverlayCircle = new MapOverlay(); 

et l'ajouter à votre Superpositions dans votre Mapview. c'est tout.