为什么未显示AutoCompleteTextView列表？

Question

我正在尝试使用autocompletetextview向用户显示员工列表。我还想从列表中单击的列表项中获取员工ID。但是，尽管我的onResponse（）方法使用截击返回了期望的结果，但我并未与列表一起显示。

我尝试初始化ArrayAdapter并使用模型Employee类。有人可以帮我吗？

public void onResponse( String response ) {
try {
    Employee employee = null;
    List<Employee> employeeResponseList = new ArrayList<Employee>();

    JSONObject rootObject = new JSONObject(response);
    JSONArray employeeRow = rootObject.getJSONArray("payload");
    Log.d(TAG, "onResponse: Response = " + response);

    for ( int i = 0; i < employeeRow.length(); i++ ) {
    String employeeName = employeeRow.getJSONObject(i).getString("name");
    String employeeId = employeeRow.getJSONObject(i).getString("id");
    //responseList.add(employeeName);
    employee = new Employee(employeeName, employeeId);
    employee.setEmployeeName(employeeName);
    employee.setEmployeeId(employeeId);
    employeeResponseList.add(employee);

    Log.d(TAG, "onResponse: name = " + employeeName );
    Log.d(TAG, "onResponse: id " + employeeId );
    }
    final ArrayAdapter<Employee> adapter =
        new ArrayAdapter<Employee> (getApplicationContext(),android.R.layout.simple_dropdown_item_1line, employeeResponseList);
    mAutoCompleteTextViewVisitee.setAdapter(adapter);
    mAutoCompleteTextViewVisitee.setThreshold(1);
    final Employee finalEmployee = employee;
    mAutoCompleteTextViewVisitee.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
        Log.d(TAG, "onItemClick: employee name = " + finalEmployee.getEmployeeName() );
        Log.d(TAG, "onItemClick: employee id = " + finalEmployee.getEmployeeId() );
    }
    });
}