如何在片段onCreateView中自定义android标题栏

Question

我正在尝试通过典型方法更改标题栏的视图：

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup group, Bundle args) {
    ...
    Window window = getActivity().getWindow();
    window.requestFeature(Window.FEATURE_CUSTOM_TITLE);
    window.setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.brand_update_layout);
    ProgressBar progressBar = (ProgressBar) inflater.inflate(R.layout.brand_update_layout, group, false)
            .findViewById(R.id.title_progress);
    TextView title_Text = (TextView) inflater.inflate(R.layout.brand_update_layout, group, false)
            .findViewById(R.id.title_text);
    title_Text.setText(Html.fromHtml("..."));
    progressBar.setVisibility(View.VISIBLE);
    ...
}

但是由于某种原因，此代码不起作用。怎么了？

UPD。 好的，我声明了

    Window window = getWindow();
    window.requestFeature(Window.FEATURE_CUSTOM_TITLE);
    window.setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.brand_update_layout); 

在活动和

    ProgressBar progressBar = (ProgressBar)getActivity().getWindow().findViewById(R.id.title_progress);
    TextView title_Text = (TextView)getActivity().getWindow().findViewById(R.id.title_text);
    title_Text.setText(...);
    progressBar.setVisibility(View.VISIBLE);

在片段中，但是我有一个错误：

    ERROR/AndroidRuntime(12213): java.lang.NullPointerException
    at com.quto.ru.CarListFragment.onCreateView(CarListFragment.java:188)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:837)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1041)
    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:616)
    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1359)

在字符串title_Text.setText(...);

Answer 1

您正在膨胀一个全新的视图并尝试使用以下代码在该新膨胀的视图中找到进度条/文本视图：

ProgressBar progressBar = (ProgressBar) inflater.inflate(R.layout.brand_update_layout, group, false).findViewById(R.id.title_progress);
TextView title_Text = (TextView) inflater.inflate(R.layout.brand_update_layout, group, false).findViewById(R.id.title_text);

试着改成这个

ProgressBar progressBar = (ProgressBar)window.findViewById(R.id.title_progress);
TextView title_Text = (TextView)window.findViewById(R.id.title_text);