title: How to get the (absolute) path to the Download folder?
body: <p>In a Flutter project, how to get the (absolute) path to the Download folder in my Android device?
  My Download folder is next those one: Alarms, Android, data, DCIM, Documents, Movies, Music, Notifications, Pictures, ...</p>
  <p>Device: GALAXY S8+ SM-G955F. Android 8.0. Not Rooted. Flutter beta v0.5.1. Dart 2.0.0-dev.58.0. Windows 10</p>
  <p><a href="https://i.stack.imgur.com/qtMaw.jpg" rel="noreferrer">File manager showing my Download folder</a></p>
  <hr />
  <p>Using this package <code>path_provider</code> I got those 3 paths:</p>
  <pre><code>/data/user/0/com.exemple.fonzo/cache
  /data/user/0/com.exemple.fonzo/app_flutter
  /storage/emulated/0
  </code></pre>
  <p>I cannot find or access those 3 folders from Solid-Explorer file manager on my un-rooted device GALAXY S8+ SM-G955F. Android 8.0. I just want to find the absolute path to a folder (like Download) that:</p>
  <ul>
  <li>I can access with my Android file manager app.</li>
  <li>I can write files in this folder from my flutter project.</li>
  </ul>