Class 对微调项选择抛出异常

Question

我有一个装有自定义适配器的微调器。

我用来将数据绑定到微调器的代码是

private void setOperatorSpinnerAdapter(Spinner spinner, String data) {

    listOperator = new ArrayList<>();
    try {

        jsonObject = new JSONObject(data);
        jsonArray = jsonObject.getJSONArray("data");
        for (int i = 0; i < jsonArray.length(); i++) {
            JSONObject jsonObject = jsonArray.getJSONObject(i);
            model2 = new LiabModel();
            model2.setName(jsonObject.optString("name"));
            listOperator.add(model2);
        }

    } catch (JSONException e) {
        e.printStackTrace();
    }
    adapter_liab = new CustomListAdapter_liab(LiabilitiesActivity.this, listOperator);
    spinner.setAdapter(adapter_liab);
}

我的问题是项目选择。我收到错误消息

java.lang.ClassCastException: java.lang.Integer 无法转换为 Model.LiabModel

我的微调器项目点击代码是

spnr.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            try {
                LiabModel model2 = (LiabModel) parent.getItemAtPosition(position);

                liab_type = model2.getName();
            }
            catch (Exception e){
                Log.e("exc",""+e);
            }
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });

我得到 Class 转换异常 "LiabModel model2 = (LiabModel) parent.getItemAtPosition(position);" 这一行。为什么会这样？

Answer 1

您可以通过此

获取选定的值

 LiabModel model2 = (LiabModel) spnr.getItemAtPosition(position);

或如果 listOperator 可访问

LiabModel model2 = listOperator.get(位置);

Class 对微调项选择抛出异常

Class cast exception on spinner item selection

android

spinner

adapter

classcastexception