Android: Wrong item checked when filtering listview

问题

I'm suffering from the same issue as this question: Wrong item checked when filtering ListView in android

As suggested in the above question, I have an Hashset holding all the selectedIds, but I can't figure out how to use it when the cursor is repopulating the checked items.

My issue is only cosmetic - for example:

"Facebook" is located at the 5th position in the unfiltered list.
User searched for "face", only "Facebook" appears in the 1st position in the filtered list.
User checks "Facebook" as selected and goes back to the unfiltered list.
The checked item is the 1st item in the list and not "Facebook" (positioned 5th).

Note: Except this issue, everything else works great. For example, "delete" will delete the right items because I use the selectedIds to do it (even if the checked items are wrong).

Single click on a list item:

OnItemClickListener mOnItemClickListener = new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

                //gets the Bookmark ID of selected position
                    Cursor cursor = (Cursor)parent.getItemAtPosition(position);
                    String bookmarkID = cursor.getString(0);

                    boolean currentlyChecked = checkedStates.get(position);
                    checkedStates.set(position, !currentlyChecked);

                    if (!selectedIds.contains(bookmarkID)) {

                        selectedIds.add(bookmarkID);
                        selectedLines.add(position);

                    } else {

                        selectedIds.remove(bookmarkID);
                        selectedLines.remove(position);


                        }

            }
        };

Inside the Cursor: - this is where the problem lies.

This repopulates the checked items - the problem is it does it by position (pos) and what was the right position of the item in the filtered list, is not its position in the unfiltered list - resulting in a wrongly marked item.

CheckedTextView markedItem = (CheckedTextView) row.findViewById(R.id.btitle);
markedItem.setChecked(checkedStates.get(pos));

Would appreciate any help!

回答1:

Could it be simply that you ListView does not know the data set changed? Call notifyDatSetChanged() on your adapter to let it know.

my_adapter.notifyDataSetChanged();

This will force a redraw of the list, with the updated data.

回答2:

Solved the issue. As suggested in the question I added to mine, when you populate the checkboxes, the other List/Hashset should determine whether to mark item as checked or not.

Using my code:

//first you will need to get the current item ID
String bookmarkID = cursor.getString(0);

//Then, check if the current ID is in the selectedIds hash/list
//If true - mark current item view as checked, else - uncheck.
        CheckedTextView markedItem = (CheckedTextView) row.findViewById(R.id.btitle);
        if (selectedIds.contains(new String(bookmarkID))) {
            markedItem.setChecked(true);

        } else {
            markedItem.setChecked(false);
}

Really hope this will help anyone! :)

回答3:

This is my solution:

To selecte an item in list view after filtering, at the beginning, I got wrong item because I used this:
```
ItemData item = listItems.get(position);
```

The correct way should be like this:

    ItemData item = (ItemData) parent.getItemAtPosition(position);

To delete an item after filtered, I have tried this:

for(int i=0;i<listItems.size();i++){
    if(listItems.get(i).getItemID() == item.getItemID()){
        listItems.remove(i);
        myAdapter.notifyDataSetChanged();
   }
}

But that didn't worked because my custom adapter. In my custom adapter, to use filter, I have two listItems:

    ArrayList<ItemData> listItemsToShow = new ArrayList< ItemData >();
    ArrayList< ItemData > listItemsBackup = new ArrayList< ItemData >();

So to delete an item, I added new method in my custom adapter:

    public void deleteItem(String itemID) {
    for (int i = 0; i < listItemsToShow.size(); i++) {
        if (listItemsToShow.get(i).getId().equals(itemID)) {
            listItemsToShow.remove(i);
            break;
        }
    }

    for (int i = 0; i < listItemsBackup.size(); i++) {
        if (listItemsBackup.get(i).getId().equals(itemID)) {
            listItemsBackup.remove(i);
            break;
        }
    }

Finally to delete an item in list view:

    subjectBaseAdapter.deleteItem(subject.getId());
    subjectBaseAdapter.notifyDataSetChanged();

Hope this help

来源：https://stackoverflow.com/questions/7874668/android-wrong-item-checked-when-filtering-listview

标签

android

android-listview