Question

我想在片段中使用微调器，我有这个代码但没有用，我有NullPointerException，我做错了什么？谢谢。

public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {




    Spinner spinner_idiomas = (Spinner) getActivity().findViewById(R.id.spinner_idioma);
    spinner_idiomas.setOnItemSelectedListener(new OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {


            Toast.makeText(getActivity(), parentView.getItemAtPosition(position).toString(), Toast.LENGTH_LONG).show();
        }

        @Override
        public void onNothingSelected(AdapterView<?> parentView) {
            // your code here
        }

    });



    return inflater.inflate(R.layout.preferencias, container, false);

Answer 1

Spinner spinner_idiomas =（Spinner）。getActivity（）findViewById（R.id.spinner_idioma）;

如果您要在活动中查找视图，请使用上述内容。这不是你想要的

更改为

public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {

  View view = inflater.inflate(R.layout.preferencias, container, false);
  Spinner spinner_idiomas = (Spinner) view.findViewById(R.id.spinner_idioma);
  spinner_idiomas.setOnItemSelectedListener(new OnItemSelectedListener() {
   @Override
   public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {

        Toast.makeText(getActivity(), parentView.getItemAtPosition(position).toString(), Toast.LENGTH_LONG).show();
    }

    @Override
    public void onNothingSelected(AdapterView<?> parentView) {
        // your code here
    }
    });
 return view;
 }

片段空指针中的微调器

1 个答案: