android file download test

file download

http://stackoverflow.com/questions/3382996/how-to-unzip-files-programmatically-in-android

file unzip

http://stackoverflow.com/questions/9324103/download-and-extract-zip-file-in-android

ZipUtils class

http://sehyo88.tistory.com/entry/%EC%95%88%EB%93%9C%EB%A1%9C%EC%9D%B4%EB%93%9C-zip-%EC%95%95%EC%B6%95-%EB%B0%8F-%ED%95%B4%EC%A0%9C

ContentProvider

ContentResolver