how to know from adapter if the item of ListView is visible or not?

问题

I have an adapter that connected to ListView, e.g.

mJournalAdapter = new JournalAdapter();
journalEntryList.setAdapter(mJournalAdapter);

and I want to know inside of my JournalAdapter if some view (item of ListView) is visible or not, is it possible?

回答1:

If you know the postion of that item then you can use

int last = listView1.getLastVisiblePosition();  

int first = listView1.getFirstVisiblePosition();

回答2:

You can get callback , overriding OnDetachedFromWindow(); method in View

回答3:

You can use getFirstVisiblePosition() will give you the first visible Item in the ListView, so you can use that in your case.

来源：https://stackoverflow.com/questions/11152432/how-to-know-from-adapter-if-the-item-of-listview-is-visible-or-not