Android-如何在自定义MyLocationOverlay中添加阴影

我想为MyLocationOverlay的自定义标记添加阴影。我已尝试使用以下方法：

我错过了什么？

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提前感谢。

最后，我可以为MyLocationOverlay的自定义标记画一个阴影，如下所示：

@Override
protected void drawMyLocation(Canvas canvas, MapView mapView, Location lastFix, GeoPoint myLocation, long when) {
    mapView.getProjection().toPixels(myLocation, currentPoint);

    canvas.drawBitmap(shadowBitmap, currentPoint.x - this.markerBitmap.getWidth()/2, currentPoint.y - this.markerBitmap.getHeight(), null);
    canvas.drawBitmap(markerBitmap, currentPoint.x - this.markerBitmap.getWidth()/2, currentPoint.y - this.markerBitmap.getHeight(), null);
}

我希望这对某人有帮助

@Override
protected void drawMyLocation(Canvas canvas, MapView mapView, Location lastFix, GeoPoint myLocation, long when) {
    mapView.getProjection().toPixels(myLocation, currentPoint);

    canvas.drawBitmap(shadowBitmap, currentPoint.x - this.markerBitmap.getWidth()/2, currentPoint.y - this.markerBitmap.getHeight(), null);
    canvas.drawBitmap(markerBitmap, currentPoint.x - this.markerBitmap.getWidth()/2, currentPoint.y - this.markerBitmap.getHeight(), null);
}