如何创建没有标题的DialogFragment？

本文翻译自：How to create a DialogFragment without title?

I'm creating a DialogFragment to show some help messages regarding my app. 我正在创建一个DialogFragment来显示有关我的应用程序的一些帮助消息。 Everything works fine besides one thing: There is a black stripe at the top of the window that shows the DialogFragment, that I presume is reserved for the title, something I don't want to use. 除了一件事之外，一切都运行正常：窗口顶部有一条黑色条纹，显示DialogFragment，我认为这是为标题保留的，我不想使用。

This is specially painful since my custom DialogFragment uses a white background, so the change is way too notorious to be left aside. 这是特别痛苦的，因为我的自定义DialogFragment使用白色背景，所以这种变化太臭名昭着，不能放在一边。

Let me show you this in a more graphical manner: 让我以更加图形化的方式向您展示：

Now the XML code for my DialogFragment is as follows: 现在我的DialogFragment的XML代码如下：

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <LinearLayout
        android:id="@+id/holding" 
        android:orientation="vertical" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent"
        android:background="@drawable/dialog_fragment_bg"
        >
        <!-- Usamos un LinearLayout para que la imagen y el texto esten bien alineados -->
        <LinearLayout
            android:id="@+id/confirmationToast" 
            android:orientation="horizontal" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content"
            >

            <TextView android:id="@+id/confirmationToastText" 
            android:layout_width="wrap_content"
            android:layout_height="fill_parent" 
            android:text="@string/help_dialog_fragment"
            android:textColor="#AE0000"
            android:gravity="center_vertical"
            />

        </LinearLayout>
        <LinearLayout
            android:id="@+id/confirmationButtonLL" 
            android:orientation="horizontal" 
            android:layout_width="fill_parent" 
            android:layout_height="fill_parent"
            android:gravity="center_horizontal"
            >    
            <Button android:id="@+id/confirmationDialogButton"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center"
                android:layout_marginBottom="60dp"
                android:background="@drawable/ok_button">
            </Button>
        </LinearLayout>
    </LinearLayout>
</ScrollView>

And the code of the class that implements the DialogFragment: 以及实现DialogFragment的类的代码：

public class HelpDialog extends DialogFragment {

    public HelpDialog() {
        // Empty constructor required for DialogFragment
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        //Inflate the XML view for the help dialog fragment
        View view = inflater.inflate(R.layout.help_dialog_fragment, container);
        TextView text = (TextView)view.findViewById(R.id.confirmationToastText);
        text.setText(Html.fromHtml(getString(R.string.help_dialog_fragment)));
        //get the OK button and add a Listener
        ((Button) view.findViewById(R.id.confirmationDialogButton)).setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                 // When button is clicked, call up to owning activity.
                HelpDialog.this.dismiss();
             }
         });
        return view;
    }

}

And the creation process in the main Activity: 而主要活动中的创建过程：

/**
 * Shows the HelpDialog Fragment
 */
private void showHelpDialog() {
    android.support.v4.app.FragmentManager fm = getSupportFragmentManager();
    HelpDialog helpDialog = new HelpDialog();
    helpDialog.show(fm, "fragment_help");
}

I really don't know if this answer, related with a Dialog, fits here also Android: How to create a Dialog without a title? 我真的不知道这个与Dialog相关的答案是否适合Android：如何创建没有标题的Dialog？

How can I get rid of this title area? 我怎样才能摆脱这个标题区域？

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#1楼

参考：https://stackoom.com/question/126Me/如何创建没有标题的DialogFragment

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#2楼

Just add this line of code in your HelpDialog.onCreateView(...) 只需在HelpDialog.onCreateView(...)添加这行代码

getDialog().getWindow().requestFeature(Window.FEATURE_NO_TITLE);

This way you're explicitly asking to get a window without title :) 这样你明确要求得到一个没有标题的窗口:)

EDIT 编辑

As @DataGraham and @Blundell pointed out on the comments below, it's safer to add the request for a title-less window in the onCreateDialog() method instead of onCreateView() . 正如@DataGraham和@Blundell在下面的评论中指出的那样，在onCreateDialog()方法而不是onCreateView()添加无标题窗口的请求更安全。 This way you can prevent ennoying NPE when you're not using your fragment as a Dialog : 这样，当您不将片段用作Dialog时，可以防止令人烦恼的NPE：

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
  Dialog dialog = super.onCreateDialog(savedInstanceState);

  // request a window without the title
  dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
  return dialog;
}

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#3楼

Dialog fragment has setStyle method, which should be called before view creation Java Doc . Dialog片段有setStyle方法，应该在视图创建Java Doc之前调用。 Also style of the dialog can be set with the same method 也可以使用相同的方法设置对话框的样式

public static MyDialogFragment newInstance() {
        MyDialogFragment mDialogFragment = new MyDialogFragment();
        //Set Arguments here if needed for dialog auto recreation on screen rotation
        mDialogFragment.setStyle(DialogFragment.STYLE_NO_TITLE, 0);
        return mDialogFragment;
}

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#4楼

Set the style to Theme_Holo_Dialog_NoActionBar: 将样式设置为Theme_Holo_Dialog_NoActionBar：

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setStyle(STYLE_NORMAL, android.R.style.Theme_Holo_Dialog_NoActionBar);
}

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#5楼

FragmentManager manager = getSupportFragmentManager();
SettingsDialog sd = new SettingsDialog();
sd.setStyle(DialogFragment.STYLE_NO_TITLE, 0);
sd.show(manager, "settings_dialog");

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#6楼

public class LoginDialog extends DialogFragment {   
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.login_dialog, null);
        getDialog().getWindow().requestFeature(Window.FEATURE_NO_TITLE);
        return view;
    }   
}