add option to messaging attach menu
<p>Is there a way to add to the list of items that can be attached in the SMS / Messaging app? i.e. right now there's Pictures, Capture Picture, Videos, ..., Record audio, Slideshow.</p>

<p>I'd like to listen to some intent in my own application to provide its own attachable object - is this possible?</p>

<p>ACTION_GET_CONTENT (http://developer.android.com/reference/android/content/Intent.html#ACTION_GET_CONTENT) seems close, but it looks to be in the other direction, i.e. picking content from my app.</p>
