This is a new problem with Lollipop only.  My app writes to external memory 
by building a file path name from:

  Environment.getExternalStorageDirectory().getAbsolutePath()

But when I plug the USB into a desktop computer, the new file does not show 
up in Explorer.  If I reboot the Lollipop Android tablet and try it again, 
the file now shows up in Explorer on the desktop computer.  Furthermore, if 
the file already existed, then the version of the file that Explorer sees 
is the new updated version, just as it should be.  Brand new files do not 
show up until a reboot of Android.

Also, this was not a problem with KitKat.  New files written by my app 
showed up immediately on the USB-connected computer.

Is there some way, in my app, to force new files to appear immediately to 
the outside world?  I am writing to the root of the external memory.  This 
is a side-loaded app, not a Market app, if that makes any difference.  It 
has been working perfectly for 3 years, until this problem with Lollipop.

-Robert Scott
 Hopkins, MN

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