Display progressdialog on list item

I have a TabActivity with 4 tabs and I display a list activity on each tab's view. the contents of the List Item are an image, a text followed by another image, these come from the database and at times some list items load their contents before the others do. In such cases, I want to show a progress dialog with the spinning wheel in it on those list items that haven't loaded yet (ie embed the progress dialog on top of the list item), just to indicate that that specific item is still getting its contents from开发者_开发技巧 the database, and them remove the dialog when the list item is ready to be diaplyed. Has anyone implemented this before? any suggestion on how to implement this is much appreciated. thanks..