Getting avalaible storage space
<p>Is there a way to know what is the available Storage space? I can't find anything in Storage class.
I'd like to advise the user that a download couldn't be done if there is not enough space.</p>

<p>Maybe I can catch an exception (is it the, too much generic, IOException?) if there is no space left when downloading the file? Is there a way to be sure that this a storage space problem?</p>