title: How to provide content for Intent.ACTION_GET_CONTENT
body: <p>The web and stackoverflow contain several examples how to get a file from another Android app (e.g., to use it as email attachment) using an ACTION_GET_CONTENT intent. But what kind of class do I have to implement to create an application providing content for the ACTION_GET_CONTENT event such as I can choose this app (e.g., for selecting an email attachment).</p>
  
  <p>Is a ContentProvider the right solution? And what do I have to add to my AndroidManifest.xml?</p>