ArcGIS Runtime SDK for Android如何对图片符号设置偏移量？

// 构建几何

Point point = new Point(0, 0);

// 构建图片符号

PictureMarkerSymbol picSymbol = new PictureMarkerSymbol(getResources().getDrawable(R.drawable.pic));

//根据图片的长度和宽度对图片符号设置偏移量

picSymbol.setOffsetX(picSymbol.getWidth()/2);

picSymbol.setOffsetY(picSymbol.getHeight()/2);

//对Graphic设置图片符号

Graphic graphic1 = new Graphic(point, new PictureMarkerSymbol(picSymbol));

//添加graphic至GraphicsLayer

GraphicsLayer graphicsLayer = new GraphicsLayer();graphicsLayer.addGraphic(graphic);

//添加GraphicsLayer

graphicsLayer.addGraphic(graphic1);