title: FileProvider and secondary external storage
body: <p>How can I serve files from the SECONDARY external storage using the <code>FileProvider</code>?</p>
  
  <p>The current implementation of the <code>FileProvider</code> handles only the first directory returned by <code>ContextCompat.getExternalFilesDirs</code></p>
  
  <pre><code>...    
  } else if (TAG_EXTERNAL_FILES.equals(tag)) {
     File[] externalFilesDirs = ContextCompat.getExternalFilesDirs(context, null);
     if (externalFilesDirs.length &gt; 0) {
         target = externalFilesDirs[0];
     }
  }
  ...
  </code></pre>
  
  <p>It seems, that there is no way to define a <code>&lt;path&gt;</code> entry for the <code>FileProvider</code>, that matches the secondary external storage path...</p>