ListPopupWindow getListView returns nullpointerexception after creation

Question

I'm using the ListPopupWindow:

@NonNull
private ListPopupWindow createListPopupWindow() {
    ListPopupWindow listPopupWindow = new ListPopupWindow(mContext);
    listPopupWindow.setBackgroundDrawable(mContext.getDrawable(R.drawable.custom_dropdown));
    listPopupWindow.setDropDownGravity(Gravity.CENTER);
    listPopupWindow.setWidth(ListPopupWindow.WRAP_CONTENT);
    listPopupWindow.setHeight(ListPopupWindow.WRAP_CONTENT);
    listPopupWindow.setModal(true);
    return listPopupWindow;
}

And when I try to call:

listPopupWindow.setAdapter(new DropDownlistAdapter(mContext,
                armAwayItems));
View container = (View) listPopupWindow.getListView().getParent();

It always returns NPE, but this method already exists in the ListPopupWindow:

 Attempt to invoke virtual method 'android.view.ViewParent android.widget.ListView.getParent()' on a null object reference

The same when I try to call

listPopupWindow.getListView().setDividerHeight(1);

and

listPopupWindow.getListView().setDivider(...);

So listPopupWindow.getListView() always returns NULL.

score 0 · Answer 1 · edited May 23 '17 at 12:16

0

try this

if(listPopupWindow != null){
listPopupWindow.setAdapter(new DropDownlistAdapter(mContext,
            armAwayItems));
View container = (View) listPopupWindow.getListView().getParent();

What is a Null Pointer Exception, and how do I fix it?

edited May 23 '17 at 12:16

Community

1
1

answered Apr 30 '16 at 10:59

Jaskaran Singh

127
5
12

score 0 · Answer 2 · answered Jun 21 '16 at 06:21

0

For those who look for answer in answer section (however M D's comment was much much earlier):

getListView() will return null until you call show() method of the listPopupWindow

answered Jun 21 '16 at 06:21

skv

85
9

ListPopupWindow getListView returns nullpointerexception after creation

2 Answers2