Android :: Adding Section Headers For My ListView

I'm adding section headers for my listView, there are few methods on the web. Since I'm using simpleCursorAdapter to manage my listView, I adopted phil bogle's method. http://thebogles.com/blog/2010/02/section-headers-for-android-listviews/

The error occurred at this part of the code:

CODE:.................

This is the LogCat shows how they compare while I scroll up the list:

CODE:..............

The correct output should be:
Sun, 05 Sep 2010
112
120

But when I scroll up, the setViewValue calls 120 first and compare with preDate(show above), it becomes:
Sun, 05 Sep 2010
112
Sun, 05 Sep 2010
120

So how can I make the section headers fixed after creating the headers? Why setViewBinder been called while scrolling?