一个关于在ArcGIS4Android的实例，实现在手机上绘制个中图形，包括点线面，矩形，圆形，手绘多边形等等，还可以实现二维面积的量算-In ArcGIS4Android instance, draw on the phone in graphics, including point, line and plane, rectangular, round, hand-painted, polygons, etc., you can also implement the two-dimensio