title: Android file delete leaves empty placeholder in Gallery
body: <p>I insert an image via:</p>
  
  <pre><code>    ContentValues values = new ContentValues();   
      values.put(Images.Media.TITLE, filename);
      values.put(Images.Media.DATE_ADDED, System.currentTimeMillis()); 
      values.put(Images.Media.MIME_TYPE, "image/jpeg");
  
      Uri uri = this.getContentResolver().insert(Images.Media.EXTERNAL_CONTENT_URI, values);
  </code></pre>
  
  <p>But when I try to delete</p>
  
  <pre><code>    File f = new File(imageURI);
      f.delete();
  </code></pre>
  
  <p>The picture is no longer there but an empty placeholder is. Any ideas?</p>