issue on sdcard in sdcard
<p>i need to retrieve the images from sdcard,i used the following code.</p>

<pre><code>String[] projection = {MediaStore.Images.Thumbnails._ID};
    cursor = managedQuery( MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI,
            projection, 
            null,       
            null,
            MediaStore.Images.Thumbnails.IMAGE_ID);
    columnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Thumbnails._ID);
    int size = cursor.getCount();
</code></pre>

<p>but the cursor always returns Zero.so i cann't get image from sdcard .whats the solution.</p>
