ListView项未使用notifyDataSetChanged（）更新

Question

Apparently the notifyDataSetChanged() only updates the visible items in the listview , I have a system that changes the background color of an item when its clicked (to dkgray), and I set everything else to transparent(the default), however other items that aren't visible remain selected(dkgray) (I only want the currently selected item to be dkgray). Is there a way to force notifyDataSetChanged() to update all items.

Here's example:

//makes all item backgrounds transparent
public void resetListViewBackground(){
    for (int i = 0; i < listView.getChildCount(); i++){ //parent.getChildCount()
        listView.getChildAt(i).setBackgroundColor(Color.TRANSPARENT);
    }
}

//reloads the listview
private void reloadListView() {
    listItems.clear();
    adapter.notifyDataSetChanged();
    listView.invalidateViews();

    ArrayList<HashMap<String, String>> notesArrayList = dbTools.getAllNotes();
    for (int i = 0; i < notesArrayList.size(); i++){
        String temp = "";
        if (notesArrayList.get(i).get("note").length() > 51){
            temp = notesArrayList.get(i).get("note").substring(0,50).toString() + "...";
        } else {
            temp = notesArrayList.get(i).get("note").toString();
        }
        listItems.add(temp);
        adapter.notifyDataSetChanged();
    }
}

Everywhere I call resetListViewBackground() , I call reloadListView() after. And this is what I use to highlight the selected item.

view.setBackgroundColor(Color.DKGRAY);

Also, the most common occurrence of this problem is that every 6th item is highlighted. The listview only shows about 4 items at a time.

Answer 1

The getChildCount() method won't work for all list items as view recycling is done. Astral is right as he writes in the comments.

1) Create a custom adapter.(See http://windrealm.org/tutorials/android/listview-with-checkboxes-without-listactivity.php )

2)Inside the onListItemClick listener's onItemClick() method, call your adapter's notifyDataSetChanged() method(whenever the user clicks a list item).

I modified the project that I mentioned and posted it on my Dropbox.(Just import it in Eclipse and run). Check it out at https://www.dropbox.com/s/gchccjzpkxk8n2z/Planets_modified.zip