Android: using notifyDataSetChanged and getLastVisiblePosition - when the listView is actually updated?

问题

I want to use getLastVisiblePosition() and apparently it is not giving me the right number after this method (notifyDataSetChanged) has been called. I think this method only notifies the view that there is a change, but the change is triggered later.

When the view is updated, is there an event that I can use and trigger my method, using getLastVisiblePosition?

Please help or tell me what I am doing wrong ;)

Thanks Danail

回答1:

Yes, if you run notifyDatasetChanged(), you need to queue the operation in the post because the view is rendered asynchronously:

     listView.post(new Runnable() { 
       public void run(){ 
         lastPos = listView.getLastVisiblePosition();
       } 
     });

来源：https://stackoverflow.com/questions/6044796/android-using-notifydatasetchanged-and-getlastvisibleposition-when-the-listvi