问题描述

android中应用编译报错

一个带下拉列表的应用，在编译的时候报错：

The constructor ArrayAdapter(LayoutNext, int, String[]) is undefined

不知道应该怎么解决？

我的实现代码：

   public class LayoutNext extends Fragment
                            implements OnClickListener,OnItemSelectedListener{

    TimePicker timepicker;
    private Spinner spinner_next;
    public ArrayAdapter<String> adapter;

    public static Fragment newInstance(Context context) {
        LayoutNext f = new LayoutNext();    

        return f;
    }

    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        ViewGroup root = (ViewGroup) inflater.inflate(R.layout.layout_next, null);  

        timepicker = (TimePicker) root.findViewById(R.id.timePicker1);
        timepicker.setIs24HourView(true);
        timepicker.setCurrentHour(0);
        timepicker.setCurrentMinute(0);

        String[] items_next = { "Next", "From to"};
        spinner_next = (Spinner) root.findViewById(R.id.sp_next);
        spinner_next.setOnItemSelectedListener(this);

 // Here I get the error
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                this,
                android.R.layout.simple_spinner_item,
                items_next);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner_next.setAdapter(adapter);

        return root;
    }

解决方案

Fragment不是context的子类，所以不能使用this。只要换成getActivity()就行。

ArrayAdapter<String> adapter = new ArrayAdapter<String>(
        getActivity(),
        android.R.layout.simple_spinner_item,
        items_next);