FireflyApi storage

3.6 External storage related

1. Get external storage path for USB-flash

   Function：public String getUSBPath(int num)
   Description：Get external storage path for USB-flash
   Parameters：index of num u disk
   Return：Returns null if failed
   Example：

2. Get the external SD card path

   Function：public String getSDcardPath()
   Description：Get the external SD card path
   Return：Returns null if failed 
   Example：

3. Uninstall external storage

   Function：public　void doUnmountVolume(String path,boolean force,boolean removeEncryption)
   Description：Uninstall external storage
   Parameters：path is volume mountPoint, it will throw an exception
   　　　Force uninstall, when it is false, the occupied device will not be uninstalled
      　 When removeEncryption is true, it contains force that is true, which will force uninstall and remove the crypto map.
   
   Remark：When calling this interface to uninstall external storage, use StorageList.getVolumeState to detect the mount state of path, and then uninstall it when it is Environment.MEDIA_MOUNTED
   Example：