如何隐藏状态＆amp;弹出菜单期间的导航栏？ [Kotlin]

Question

到目前为止，这是我的进步。问题在于，菜单启动时，状态栏会短暂闪烁，并且在菜单和选择期间，导航栏保留。

是否有人知道如何在不显示系统栏的完整应用程序中显示弹出菜单？

class MainActivity : AppCompatActivity() {
    lateinit var popup2:View
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        popup2 = findViewById<Button>(R.id.popup_press)
        supportActionBar?.hide()  //Doesn't work

        popup2.setOnClickListener {
            val popup = PopupMenu(applicationContext, popup2)
            popup.menuInflater.inflate(R.menu.popupmenu, popup.menu)
            popup.setOnMenuItemClickListener { i ->
                when (i.itemId) {
                    R.id.menuA -> {
                        Toast.makeText(applicationContext, "Menu A", Toast.LENGTH_LONG).show()
                    }
                    R.id.menuB -> {
                        Toast.makeText(applicationContext, "Menu B", Toast.LENGTH_LONG).show()
                    }
                    R.id.menuC -> {
                        Toast.makeText(applicationContext, "Menu C", Toast.LENGTH_LONG).show()
                    }
                    else -> false
                }
                true
            }
            popup.show()
        }
    }

    //Hides status bar AFTER menu has shown. Can't stop it showing!!!!!
    override fun onWindowFocusChanged(hasFocus: Boolean) {
        super.onWindowFocusChanged(hasFocus)
        if (hasFocus) {
            hideSystemUIView(popup2) //runs before menu and after
        } else {
            hideSystemUIView(getWindow().getDecorView()) // Hides menu - blinks
        }
    }

    fun hideSystemUIView(view: View) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            window.attributes.layoutInDisplayCutoutMode =
                WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
        }

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
            window.setDecorFitsSystemWindows(false)
            window.insetsController?.apply {
                hide(WindowInsets.Type.statusBars() or WindowInsets.Type.navigationBars())
                systemBarsBehavior = WindowInsetsController.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
            }
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            @Suppress("DEPRECATION")
            window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_FULLSCREEN
                    or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                    or View.SYSTEM_UI_FLAG_IMMERSIVE
                    or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                    or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                    or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION)
        }
    }
}

XML文件

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <Button
        android:id="@+id/popup_press"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="150dp"
        android:text="POP UP MENU"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

菜单

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/menuA"
        android:title="menu A">
    </item>
    <item
        android:id="@+id/menuB"
        android:title="menu B">
    </item>
    <item
        android:id="@+id/menuC"
        android:title="menu C">
    </item>
</menu>

Answer 1

您如何从大象中摔下来？
你没有；你从鸭子那里下来。

使用这种相同的理念，我认为不可能纠正/改变内置菜单功能的行为。我的解决方案是废除这些问题，只是构建自己的菜单功能，这实际上只需要线性布局中的一些标准化文本字段即可。现在，我可以完全控制发生的事情。

这是一个示例字段：

        <TextView
            android:id="@+id/choice03"
            android:layout_width="@dimen/choicemenuletterwidth"
            android:layout_height="wrap_content"
            android:paddingTop="@dimen/choicemenuletterpadding"
            android:paddingStart="@dimen/choicemenuletterpadding"
            android:paddingBottom="@dimen/choicemenuletterpadding"
            android:layout_marginTop="@dimen/choicemenumargintop"
            android:layout_marginStart="@dimen/choicemenumarginstart"
            android:layout_marginEnd="@dimen/choicemenumarginstart"
            android:text="@string/menus_redo"
            android:textColor="@color/title_text"
            android:textSize="@dimen/choicemenuletterheight"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">
        </TextView>