How to refresh a GridView?

Question

I have a GridView which is pretty similar to the Google tutorial, except that I want to add the ImageViews on runtime (via a subactivity). The results are okay, but the layo

Answer 1

adapter.notifyDataChanged();

may not works just because data for the adapter is stale (if Activity or fragment was not destroyed and have been sitting in the back stack for instance).

So, if firstly refresh data, then after it will be working.