android程序在我手机上总是崩溃，程序运行日志显示错误在以下紫色部分处，存在java.lang.nullPointerException异常，导致每次准备打开电灯时程序都会崩溃。 问了很多人都不知道该怎么解决，我刚刚接触android和arduino实在是没有办法了。希望各位大神能够帮帮我，谢谢 ...

We’ve never seen someone build a plotter out of buzzwords, but [roxen] did a really good job of it. The idea is simple, place the plotter over a sheet of paper, open a website, draw, and watch the ...