Android onClickListener strange behavior

i'm trying to set a child click listener on my ExpandedListView, and i'm getting some strange results:

theList.setOnChildClickListener(new OnChildClickListener() {
    @Override
    public boolean onChildClick(ExpandableListView parent, View view, int groupPosition, int childPosition, long id) {
        Log.i(LOG_TAG, "clicked");

        ExpandableListAdapter adapter = parent.getExpandableListAdapter();
        View v = (View)adapter.getChild(groupPosition, childPosition);

        Toast toast = Toast.makeText(getApplicationContext(), 
                "item: " + new Integer(groupPosition).toString() + ":" + new Integer(childPosition).toString(), 
                Toast.LENGTH_SHORT);
        toast.show();

        if (!((CheckedTextView)view.findViewById(R.id.check)).isChecked()){
            ((CheckedTextView)view.findViewById(R.id.check)).setChecked(true);
        } else {
            ((CheckedTextView)view.findViewById(R.id.check)).setChecked(false);
        }

        return true;
    }
});

it sort of works. when i check one of the items, howev开发者_StackOverflow中文版er, another, additional item will also be selected, seemingly at random. am i not doin this correctly?

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Solved the issue myself. i ended up extending the adapter class and overriding getChildView and getGroupView and added a list of booleans to the adapter to keep up with the checkmarks. probably not the most sophisticated solution, but works perfectly.