java.io.File

  对于Android 2.3来说原始Sun公司的java.io.File包中的内容也有了改进，File类在API Level为9时多出了很多新特性，比较实用的有:   public long getFreeSpace ()  返回这个分区包含这个路径的剩余空间，如果返回0则表示不存在，下面为SDK原文    Returns the number of free bytes on the partition containing this path. Returns 0 if this path does not exist. Note that this is likely to be an optimistic over-estimate and should not be taken as a guarantee your application can actually write this […]