FirebaseUI-不兼容的类型：字符串不能转换为DatabaseReference

Question

我Incompatible types: String cannot be converted to DatabaseReference在onItemClick获取Firebase数据库密钥时出错。我用来从Firebase数据库填充ListView的代码mListView = (ListView) rootView.findViewById(R.id.listview1);DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReferenceFromUrl("https://my-project.firebaseio.com/name/data");FirebaseListAdapter<Personnel> adapter = new FirebaseListAdapter<Personnel>(getActivity(),Personnel.class,R.layout.layout_items,databaseReference) {    @Override    protected void populateView(View v, Personnel model, int position) {        TextView textView = (TextView) v.findViewById(R.id.tv_title);        textView.setText(model.name);    }};mListView.setAdapter(adapter);ListView的onItemClick（从修改）mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {    @Override    public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {        DatabaseReference itemRef = adapter.getItem(position);        Toast toast = Toast.makeText(getActivity().getApplicationContext(), itemRef.getKey(), Toast.LENGTH_SHORT);        toast.show();    }});首先我在下面有Variable 'adapter' is accessed from within inner class, needs to be declared final错误adapteradapter.getItem(position);onItemClick所以我添加final了final FirebaseListAdapter<Personnel> adapter...这个错误我尝试声明adapter为全局，但仍然遇到相同的错误。请让我知道如何解决此问题。谢谢！