安卓微调GetSelection

Question

我在Android Project工作。这是我的小代码

      //SpinAdapter is custom class
        SpinAdapter fromAdapter = new SpinAdapter(getActivity(), 0, new ArrayList<Cities>()); 

          // private Spinner mFrom;
         mFrom.setAdapter(fromAdapter);

         AsyncHttpClient.get(url, null, new HttpResponseHandler() {
            @Override
            public void onOperationSuccess(String response) {
                Type listOfTestObject = new TypeToken<ArrayList<Cities>>() {
                }.getType();
                ArrayList<Cities> list = new Gson().fromJson(response, listOfTestObject);
                fromAdapter.addAll(list);
               Cities selectionId=mFrom.getSelection()
            }

            @Override
            public void onFailure(String message) {

            }
        });

var selectionId是否为空？为什么？

有人能帮我吗？

Answer 1

对于微调器，您需要使用getSelectedItem()，而不是getSelection()

可以使用getSelectedItem().toString()获取字符串