How to get items currently displayed in AdapterView?

问题

As in title: I would like to know how to get list (array) of all currently displayed items in my AdapterView.
Why? Objects that are displayed in my AdapterView require releasing a listener after user closes AdapterView. I need to do it in order to optimize my app.
Or is there any method (that I could override) which is executed on views' destruction?

回答1:

implements OnScrollListener

public class NewsCategoryDC extends Activity implements OnScrollListener {

and set OnScrollListener in listView

listView.setOnScrollListener(NewsCategoryDC.this);

and you can get first and last visible rows

@Override
public void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {
    firstVisibleRow = listView.getFirstVisiblePosition();
            lastVisibleRow = listView.getLastVisiblePosition();
/*Now you get the first and last visible rows, and you easily get the rows from first to last visible row and allocate resources to visible rows or deallocate resources to rows except visible rows..,.*/
}

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {}

TRY THIS..,.

and if some other best way you got please post, this is very useful and good question..,.

Thanks..,.

EDIT............................

add code in onScroll() method

@Override
public void onScroll(AbsListView view, int firstVisibleItem,int visibleItemCount, int totalItemCount) {
    int firstVisibleRow = listView.getFirstVisiblePosition();
    int lastVisibleRow = listView.getLastVisiblePosition();

    for(int i=firstVisibleRow;i<=lastVisibleRow;i++)
    {
        //Write your code here(allocation/deallocation/store in array etc.)
        System.out.println(i + "=" + listView.getItemAtPosition(i));
    }
}

回答2:

As small hint:

If you want to get all elements which are fully visible ( --> expect those, who are on the bottom or top and are nearly out of screen) you should look at this post :

See only fully visible ListView-Items

来源：https://stackoverflow.com/questions/13130389/how-to-get-items-currently-displayed-in-adapterview

标签

android

view

adapter