How can I browse my Mac's hard drives with my Android phone? Is there any Android software that can understand afp or browse OS X filesystems some other way
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Astro File Manager has an SMB module that appears to work for browsing the filesystem via Samba.  I haven't found any AFP or Bluetooth modules (yet); for the latter, Android likes Bluetooth OBEX-FTP but the only server implementation I could find for OSX is ancient and bitrotted.  Android doesn't appear to have any way to do the kind of OBEX stuff OSX wants — although I'd love to be proven wrong about that.