title: How to fill a single textview with the total sum of a db column using contentprovider
body: <p>What a question! 
  To describe it more clearly:
  I'm using fragments and my target is to have a TextView that shows the total sum of a database table column. This total sum should be updated everytime the table is updated in different ways (delete, insert, update).
  Without the contentprovider I would write a method in my DBHelper class that would return the value. But the the problem begins.It's really difficult (till impossible) in fragments to update the textview programmatically. Therefore I like to use the contentprovider because it always informs my listviews about changes without any additional work from my side. In this case (contentprovider) I have (imho) to use the loader methods onCreateLoader() and onLoadFinished() with a cursorloader and a uri. But they all are returning a cursor object and that's nothing I can attach on this single textview.
  After all the days working on listviews and contentproviders my thinking is maybe too "bigpictured" so that I'm not able to see a simple solution for a simple textview. If there is any... </p>