Protect files from being accessed outside the app itself
<p>I am developing an android application, where I download pdf files.
So I create a file called <code>NameProject</code> where I put all downloaded pdfs. I can access this file via my application and also via other application like File Manager.
The android file system is open so I need to protect downloaded files from being accessed outside the app itself.</p>

<p>Can I do that? If yes, any ideas will be appreciated.</p>

<p>Thanks</p>
