java - 微调器以 XML 格式显示但在加载应用程序时不显示

Question

我的 fragment 中有以下内容，我正在尝试创建一个显示数字 1-5 作为选择选项的微调器:

@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);
}

字符串.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

在您的 onCreateView() 方法中，您将在 return 语句中返回一个新的、未初始化的 View。相反，您想要返回之前已膨胀和初始化的 View。即，将 return 语句更改为:

return rootview;