DialogFragment 在全屏时不隐藏导航控件

Question

我正在尝试全屏

DialogFragment

，并且能够在点击屏幕时显示/隐藏状态和导航栏。这里是

DialogFragment

class FullScreenFragment : DialogFragment() {

   override fun onCreate(savedStateInstance: Bundle?) {
       super.onCreate(savedStateInstance)

      setStyle(STYLE_NORMAL, R.style.Theme_FullScreenDialog) 
   }

   override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
      binding = FragmentTemplateBinding.inflate(inflater, container, false)
      return binding.root
   }

  override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)

    activity?.window?.decorView?.systemUiVisibility = (View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                    or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                    or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                    or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                    or View.SYSTEM_UI_FLAG_FULLSCREEN
                    or View.SYSTEM_UI_FLAG_IMMERSIVE)  
  }
}

相关主题是，

<style name="Theme.FullScreenDialog" parent="Theme.MaterialComponents.Dialog">
    <item name="windowNoTitle">true</item>
    <item name="android:windowIsFloating">false</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:fitsSystemWindows">false</item>

    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:textColor">@android:color/white</item>
</style>

完成这些步骤后，我仍然可以看到导航栏。状态栏似乎被隐藏了。知道可能是什么问题吗？

Answer 1

通过这种方式设置我的主题，我能够在（全屏）DialogFragment 中进入沉浸式模式，而无需更改

FLAG_NOT_FOCUSABLE

：

<style name="AppTheme" parent="Theme.MaterialComponents.NoActionBar">
    <item name="android:dialogTheme">@style/Dialog</item>
    ...
</style>
<style name="Dialog" parent="ThemeOverlay.MaterialComponents.Dialog">
    <!-- windowBackground removes padding in inherited background -->
    <item name="android:windowBackground">?attr/colorSurface</item>
    <item name="android:windowIsFloating">false</item>
    <item name="android:windowNoTitle">true</item>
</style>

然后我进入沉浸式模式（注意

dialog?.window?.decorView

而不是

activity?.window?.decorView

）：

dialog?.window?.decorView?.let(ViewCompat::getWindowInsetsController)?.apply {
    systemBarsBehavior =
        WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
    hide(WindowInsetsCompat.Type.systemBars())
}