title: View folder contents in Android using default explorer
body: <p>I want to programatically launch a default file explorer to show me the contents of a folder.</p>
  
  <p>I'm using this code, but it crashes:</p>
  
  <pre><code>    Uri startDir = Uri.fromFile(new File("/sdcard/DCIM/Camera")); 
      Intent intent = new Intent(); 
      intent.setAction(Intent.ACTION_VIEW); 
      intent.setData(startDir);
      startActivity(intent);
  </code></pre>
  
  <p>LogCat shows "No Activity found to handle the Intent"...</p>
  
  <p>What's my best option to do this? I want the user to see the contents of the folder and be able to click the files (e.g. click a video and launch it with default player, click a PDF and open it etc).</p>