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    <blockquote> <p>I'm struggling to associate my app with a particular file type (.stl).</p> </blockquote> <p>Generally, Android does not use file extensions to indicate type. Android uses MIME types to indicate type.</p> <blockquote> <p>When trying to launch a file from a file manager, my app isn't one of the options suggested.</p> </blockquote> <p>Well, the only guaranteed-solid answer is:</p> <p>Step #1: Determine the MIME type that <code>.stl</code> files are associated with</p> <p>Step #2: Use that MIME type in your <code>&lt;activity&gt;</code> element for the <code>android:mimeType</code> attribute</p> <p>Step #3: Force each and every file manager author to implement support for your MIME type for when they encounter <code>.stl</code> files</p> <p>Step #3, of course, is the problem.</p> <p>Android, like iOS and other operating systems, are trying desperately to hide the concept of "files" from the user. That is why there is no file manager built into Android, why few devices bundle one, and why there is little support for the concept in the OS.</p> <p>You are welcome to try to use <code>&lt;data android:scheme="file" android:pathPattern=".*\\.stl" /&gt;</code> in your <code>&lt;data&gt;</code> element to support things based on file extension, though I'm not sure if that works well. You might also need <code>android:host="*"</code> in that element -- Android itself does not use <code>pathPattern</code> for the <code>file</code> scheme, and the third-party code I am examining shows the element both ways. Again, I have no idea if it works.</p>
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    1. POassociate file type with android app fails
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    1. COThanks @CommonsWare, useful info there about Android's attitude to 'files'... Another answer elsewhere has a version which allows me to correctly grab files from http sources, but still not Astro (the file manager). However, a couple of other stl readers **have** managed to do it - they are offered when an stl file is selected - so it must be possible. I'm still searching for the answer...
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    2. CO@Baz: please re-read the last paragraph of my answer.
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    3. COYes, sorry, didn't mean to ignore that, I had tried those lines previously without success, but I have found the answer! (below).
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