Android上SD卡获取路径的问题－－Android 3.0上SD卡插拔和获取路径的问题

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http://www.linuxidc.com/Linux/2011-02/32603.htm

http://mycoding.iteye.com/blog/1033750

http://web1102511.sx173.hsftp.net/simple/?t5909.html

http://developer.android.com/reference/android/os/Environment.html

http://developer.android.com/reference/android/content/ContextWrapper.html

http://book.51cto.com/art/201007/212187.htm

http://www.iteye.com/problems/75294