学习手机j2me的必备程序，俄罗斯方块程序，没有图片资源，画矩形实现的，算法还行-phone j2me learning of the requisite procedures, the Russian box procedures, no pictures resources, the realization of rectangular painting, Algorithm also OK

一个简单的调用相机的程序，屏幕中间矩形框选景（周围遮罩），通过Thread画一条扫描绿线（动画）(A simple call camera program, the middle of the screen rectangle election scene (around the mask), by Thread draws a green line scan (animation))