title: Android DocumentFile invalid URI
body: <p>i am trying to list files in external storage devices on my android 5.1 phone using DocumentFile</p>
  
  <pre><code>String rootPathURI = "file:/media/storage/sdcard1/data/example.externalstorage/files/";
  
  
  File f = new File(URI(rootPathURI));
  DocumentFile documentFile = DocumentFile.fromFile(f);
  </code></pre>
  
  <p>This code works fine but i want to do it like this;</p>
  
  <pre><code>String rootPathURI = "file:/media/storage/sdcard1/data/example.externalstorage/files/";
  
  DocumentFile documentFile = DocumentFile.fromTreeUri(getApplicationContext(), Uri.parse(rootPathURI));
  </code></pre>
  
  <p>but i get an exception like this:</p>
  
  <pre><code>W/System.err( 5157): java.lang.IllegalArgumentException: Invalid     URI:"file:/media/storage/sdcard1/data/example.externalstorage/files/"
  </code></pre>