如何为DialogFragment设置主题

有人可以解释一下为什么这个声明效果很好：

setStyle(DialogFragment.STYLE_NO_TITLE, android.R.style.Theme_Holo);

并且下一个声明没有传递

setStyle(DialogFragment.STYLE_NO_TITLE, R.style.dialog);

这是我在风格部门的内容：

<style
    name="dialog">
    <!-- title encapsulating main part (backgroud) of custom alertdialog -->
    <item
        name="android:windowFrame">@null</item>
        <!-- turn off any drawable used to draw a frame on the window -->
    <item
        name="android:windowBackground">@null</item>
        <!-- turn off any drawable used to draw a frame on the window -->
    <item
        name="android:windowIsFloating">true</item>
        <!-- float the window so it does not fill the screen -->
    <item
        name="android:windowNoTitle">true</item>
        <!-- remove the title bar we make our own-->
    <item
        name="android:windowContentOverlay">@null</item>
        <!-- remove the shadow from under the title bar -->
</style>

尝试使用片段的 onCreate 中的代码作为

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
        
    setStyle(DialogFragment.STYLE_NO_TITLE, R.style.dialog);
}