構造函數ArrayAdapter <String>（LayoutNext，int，String []）未定義

Question

我嘗試從android.support.v4.app.Fragment類實現項目到微調。我總是得到編譯器錯誤

構造ArrayAdapter（LayoutNext，INT的String []）是不確定的

我該如何解決這個問題？ 下面是代碼：

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; 
    } 

Answer 1

與活動，片段不是上下文的子類，所以你不能使用this在需要的上下文。改爲使用getActivity()。

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