android 的入门资料,以及部分源码翻译-android introductory information, as well as some source code translation

安卓系统的文件复制源代码，可以实现图片和TXT等文件的复制功能，未经过真机测试！还有一首没写完的诗-Andrew file system source code, can achieve such pictures and TXT file replication, not through the real test! There is a poem that I' m