title: Delete photo thumbnail in Gallery after manually delete the photo file
body: <pre><code>case R.id.menu_delete:
      File photoToDelete = new File(photoPath, photoList[gPosition]);
      photoToDelete.delete();
      checkPhotoFolder();
      galleryAdapter.notifyDataSetChanged();
      Log.d("position", "" + gPosition);
      return true;
  </code></pre>
  
  <p>I'm manually delete a photo file using above code. But in the system gallery the photo still show the blank thumbnail.
  The question is how can I delete the photo file and also the thumbnail of it in the gallery?</p>