如何在Android Studio 3.4中删除操作栏？

Question

我的项目使用导航框架，layout_home.xm l将同时加载UIFragmentCamera.xml和layout_fragment_camera_ui.xml]

我删除了所有操作栏，并使用代码UIHome.kt将窗口设置为全屏，所以我可以像Image 1一样获得全屏。

当我单击按钮btnMenu时将显示弹出菜单，但该窗口还会显示操作栏，您可以看到图像2。

单击btnMenu弹出菜单时如何将窗口设置为全屏？

UIHome.kt

private const val IMMERSIVE_FLAG_TIMEOUT = 500L

const val FLAGS_FULLSCREEN = View.SYSTEM_UI_FLAG_LOW_PROFILE or
        View.SYSTEM_UI_FLAG_FULLSCREEN or
        View.SYSTEM_UI_FLAG_LAYOUT_STABLE or
        View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY or
        View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION or
        View.SYSTEM_UI_FLAG_HIDE_NAVIGATION

class UIHome : AppCompatActivity() {

    private lateinit var mContext: Context
    private lateinit var container: FrameLayout

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.layout_home)     
        container = findViewById(R.id.fragment_container)
    }

    override fun onResume() {
        super.onResume()       
        container.postDelayed({
            container.systemUiVisibility = FLAGS_FULLSCREEN
        }, IMMERSIVE_FLAG_TIMEOUT)
    }

}

UIFragmentCamera.kt

class UIFragmentCamera : Fragment() {

    private lateinit var container: ConstraintLayout
    private lateinit var viewFinder: TextureView

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?): View? =
        inflater.inflate(R.layout.layout_fragment_camera, container, false)


    @SuppressLint("MissingPermission")
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        container = view as ConstraintLayout
        viewFinder = container.findViewById(R.id.view_finder)

        viewFinder.post {
            View.inflate(requireContext(), R.layout.layout_fragment_camera_ui, container)
            btnMenu.setOnClickListener{
                    v -> showPopup(v, requireContext())
            }
        }
    }


    private fun showPopup(v: View, mContext: Context) {
        val popup = PopupMenu(mContext, v)
        popup.inflate(R.menu.menu_popup_more)

        popup.setOnMenuItemClickListener {
                item -> handlePopupMenu(item, mContext)
        }
        popup.show()
    }

    private fun handlePopupMenu(item: MenuItem, mContext: Context): Boolean {
        when (item.itemId) {
            R.id.MenuMoreAbout->{
               requireActivity().openActivity<UIAbout>()
            }

        }
        return false
    }
}

layout_home.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
    >

    <fragment
            android:id="@+id/fragment_container"
            android:name="androidx.navigation.fragment.NavHostFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:defaultNavHost="true"
            app:navGraph="@navigation/nav_graph" />

</FrameLayout>

UIFragmentCamera.xml

<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/camera_container"
        android:background="@android:color/black"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    <TextureView
            android:id="@+id/view_finder"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

layout_fragment_camera_ui.xml

<androidx.constraintlayout.widget.ConstraintLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:id="@+id/camera_ui_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent">


    <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/cutout_safe_area"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        <ImageButton
                android:id="@+id/btnMenu"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                android:layout_marginRight="@dimen/margin_xsmall"
                android:layout_marginTop="@dimen/margin_small"
                android:layout_width="@dimen/round_button_small"
                android:layout_height="@dimen/round_button_small"
                android:scaleType="fitCenter"
                android:background="@android:color/transparent"
                app:srcCompat="@drawable/ic_back" />


    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

图像1

图像2

Answer 1

您应该在AndroidManifest中设置主题，而不是在活动onResume（）生命周期方法中设置主题

<activity
android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
....
>