動畫可繪製MyLocationOverlay（）

Question

是否可以重寫MyLocationOverlay（）的onDraw方法，並用其他方法替換標準閃爍的藍色圖標。我可以實現這個的方式有哪些？

Answer 1

真正好的答案，在這裏你的問題： myLocationOverlay change the marker

的drawMyLocation(..)函數中繪製動畫GIF圖像。 Display Animated GIF

public class CurrentLocationOverlay extends MyLocationOverlay { 

    // TODO: use dynamic calculation? 
    private final static int PADDING_ACTIVE_ZOOM  = 50; 

    private MapController mc; 
    private Bitmap   marker; 
    private Point   currentPoint   = new Point(); 

    private boolean   centerOnCurrentLocation = true; 

    private int    height; 
    private int    width; 

    /** 
    * By default this CurrentLocationOverlay will center on the current location, if the currentLocation is near the 
    * edge, or off the screen. To dynamically enable/disable this, use {@link #setCenterOnCurrentLocation(boolean)}. 
    * 
    * @param context 
    * @param mapView 
    */ 
    public CurrentLocationOverlay(Context context, MapView mapView) { 
    super(context, mapView); 
    this.mc = mapView.getController(); 
    this.marker = BitmapFactory.decodeResource(context.getResources(), R.drawable.position); 
    } 

    @Override 
    protected void drawMyLocation(Canvas canvas, MapView mapView, Location lastFix, GeoPoint myLocation, long when) { 
    // TODO: find a better way to get height/width once the mapView is layed out correctly 
    if (this.height == 0) { 
     this.height = mapView.getHeight(); 
     this.width = mapView.getWidth(); 
    } 
    mapView.getProjection().toPixels(myLocation, currentPoint); 
    canvas.drawBitmap(marker, currentPoint.x, currentPoint.y - 40, null); 
    } 

    @Override 
    public synchronized void onLocationChanged(Location location) { 
    super.onLocationChanged(location); 
    // only move to new position if enabled and we are in an border-area 
    if (mc != null && centerOnCurrentLocation && inZoomActiveArea(currentPoint)) { 
     mc.animateTo(getMyLocation()); 
    } 
    } 

    private boolean inZoomActiveArea(Point currentPoint) { 
    if ((currentPoint.x > PADDING_ACTIVE_ZOOM && currentPoint.x < width - PADDING_ACTIVE_ZOOM) 
     && (currentPoint.y > PADDING_ACTIVE_ZOOM && currentPoint.y < height - PADDING_ACTIVE_ZOOM)) { 
     return false; 
    } 
    return true; 
    } 

    public void setCenterOnCurrentLocation(boolean centerOnCurrentLocation) { 
    this.centerOnCurrentLocation = centerOnCurrentLocation; 
    } 
}