微調顯示在XML，但不是在加載應用程序

Question

我在片段下面，我試圖創建一個顯示數字1-5作爲選擇選項的微調：

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    final View rootview = inflater.inflate(R.layout.fragment_create, container, false); 
    mAddImageButton = (Button) rootview.findViewById(R.id.add_image_button); 
    mSelectNumberofPollAnswers = (Spinner) rootview.findViewById(R.id.number_of_answers_spinner); 
    // Inflate the layout for this fragment 

    // Create an ArrayAdapter using the string array and a default spinner layout 
    ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getActivity().getApplicationContext(), 
      R.array.number_of_poll_answers, android.R.layout.simple_spinner_item); 
    // Specify the layout to use when the list of choices appears 
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
    // Apply the adapter to the spinner 
    mSelectNumberofPollAnswers.setAdapter(adapter); 


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

的strings.xml：

<string-array name="number_of_poll_answers"> 
     <item>1</item> 
     <item>2</item> 
     <item>3</item> 
     <item>4</item> 
     <item>5</item> 
    </string-array> 

XML：

<Spinner 
    android:id="@+id/number_of_answers_spinner" 
    android:layout_width="fill_parent" 
    android:layout_height="0dp" 
    android:layout_weight=".3"/> 

Answer 1

在你onCreateView()方法，你就返回一個新的，未初始化View在return聲明中。相反，您希望返回在此之前膨脹並初始化的View。也就是說，return聲明更改爲：

return rootview; 

Answer 2

嘗試：

return rootview; 

而不是

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

Answer 3

您必須返回rootView這樣

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
        Bundle savedInstanceState) { 
final View rootview = inflater.inflate(R.layout.fragment_create, container, false); 
mAddImageButton = (Button) rootview.findViewById(R.id.add_image_button); 
mSelectNumberofPollAnswers = (Spinner) rootview.findViewById(R.id.number_of_answers_spinner); 
// Inflate the layout for this fragment 

// Create an ArrayAdapter using the string array and a default spinner layout 
ArrayAdapter<CharSequence> adapter =  ArrayAdapter.createFromResource(getActivity().getApplicationContext(), 
     R.array.number_of_poll_answers, android.R.layout.simple_spinner_item); 
// Specify the layout to use when the list of choices appears 
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
// Apply the adapter to the spinner 
mSelectNumberofPollAnswers.setAdapter(adapter); 


return rootview; 
}