Android onClickListener的奇怪行为

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;
    }
});