Answer 1

I was struggling with this same issue and this is what worked for me.

First I've set a cursor adapter that keeps the items checked state based on their ids, since positions aren't useful when the list can be changed dynamically.

private class TagListAdapter extends SimpleCursorAdapter {
    /**
     * Stores boolean values for the list items, based on their ids.
     */
    SparseBooleanArray mCheckStates;

    public TagListAdapter(Context context, int layout, Cursor c, String[] from, int[] to) {
        super(context, layout, c, from, to);
        mCheckStates = new SparseBooleanArray();
    }

    /**
     * Sets an id as checked/unchecked.
     * @param id
     * @param checked
     */
    public void setChecked(int id, boolean checked) {
        mCheckStates.put(id, checked);
    }

    /**
     * @see android.widget.ListAdapter#getView(int, View, ViewGroup)
     */
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);

        if(!mCursor.moveToPosition(position)) {
            throw new IllegalStateException("couldn't move cursor to position " + position);
        }

        int id = mCursor.getInt(INDEX_OF_COLUMN_ID);
        if(mCheckStates.indexOfKey(id) < 0) {
            // Populate checked value for the first time.
            mCheckStates.put(id, function_that_returns_if_the_item_is_checked(id));
        }

        // Set the item as checked or unchecked based on the value stored in mCheckStates.
        mListView.setItemChecked(position, mCheckStates.get(id, false));
        return view;
    }
}

Then in my activity I've set a onListItemClick() that executes the related check/uncheck action and sets the checked state in the adapter:

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    boolean checked = ((CheckedTextView) v).isChecked();

    if(checked == true) {
        // execute uncheck related action
        function_called_when_item_is_unchecked(id);
    } else {
        // execute check related action
        function_called_when_item_is_checked(id);
    }

    // Check/uncheck the item in the adapter.
    ((TagListAdapter) getListAdapter()).setChecked((int) id, !checked);
}

Answered by: Tess933 | Posted: 25-02-2022

Answer 2

Speaking out my personal opinion, I am assuming the positions would still remain checked because the getCheckedItemPositions() reflects the positions opposed to values, so if positions 0 and 3 are still exist inside the ListView after deletion, they will remain checked.

I could be wrong, just voicing my own opinion. Good luck

Answered by: Kevin302 | Posted: 25-02-2022

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