Android 在地图上画矩形

1. point1=map.toMapPoint(400,426);
2. point2=map.toMapPoint(600,640);
3. initextext = new Envelope(point1.getX(),point1.getY(),point2.getX(),point2.getY());
4. SimpleFillSymbol sfs=new SimpleFillSymbol(Color.GRAY);
5. sfs.setAlpha(60);
6. agraphicLayer.addGraphic(new Graphic(initextext,sfs));
7. map.addLayer(agraphicLayer);

先根据俩对角线的点获取Extent