title: Show all image in sdcard with MediaStore.Images.Thumbnails._ID
body: <p>I use below method to view image in gridview.
   <a href="http://wang-peng1.iteye.com/blog/676010" rel="nofollow">Reference</a></p>
  
  <pre><code>String[] projection = {MediaStore.Images.Thumbnails._ID};  
  Cursor cursor = managedQuery( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, projection, null, null, null);
  </code></pre>
  
  <p>It show the image which had thumbnail in sdcard.
  But I want to show all the images in sdcard, not only the thumbnail exist one.
  Is there any method to make the Android System to create the thumbnail for MediaStore.Images.Thumbnails._ID use?</p>