As discussed in another thread (http://groups.google.com/group/android-
developers/browse_thread/thread/d79bfa05528cbbee/2b08822eeb767b7b), my
program allows users to export data by email. I do this by writing
the data to a temporary file, then attaching it to an Intent:
startActivity(new Intent(Intent.ACTION_SEND).setType("application/
vnd.mytype").putExtra(Intent.EXTRA_STREAM,
android.net.Uri.fromFile(tempFile)));
I've run into a difficulty with this approach, though: making sure the
temporary file gets deleted when it isn't needed anymore.
On most platforms, File.createTempFile() creates the file in a special
location such as /tmp which ensures it will get deleted the next time
the computer boots. Not so on Android: it just creates the file at
the root level of the SD card, causing "temp" files to just build up
and never get deleted. I tried to force it to get deleted by calling
deleteOnExit(). No good: it still doesn't get deleted, presumably
because Android apps never really "exit", they just get suspended and
then killed.
So it looks like I need to manually delete the file when it's no
longer needed. The question is, how can I tell when it's no longer
needed? In this case, it's not a matter of when *my* program is done
with it, but rather when the email client is done with it. Does
anyone have suggestions for how to deal with this?
Peter
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