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How to access MyLocationOverlay's canvas?
public boolean draw(android.graphics.Canvas canvas, MapView mapView, boolean shadow, long when)
{
    Log.v("Message", "Executing draw method...");
    boolean result;
    result = super.draw(canvas, mapView, shadow, when);

    if(geoLastFix != null) //geoLastFix contains the GeoPoint of my Location.
    {
        Point screenPts = mapView.getProjection().toPixels(geoLastFix, null);

        //rotate bitmap
        Bitmap arrowBitmap = marker;
        Matrix matrix = new Matrix();
        matrix.postRotate(orientation);
        Bitmap rotatedBmp = Bitmap.createBitmap(
            arrowBitmap,
            0, 0,
            arrowBitmap.getWidth(),
            arrowBitmap.getHeight(),
            matrix,
            true
        );
       //print bitmap to canvas
        canvas.drawBitmap(
            rotatedBmp,
            screenPts.x - (rotatedBmp.getWidth()  / 2),
            screenPts.y - (rotatedBmp.getHeight() / 2),
            null
        );
    }
    return result;
}