BottomNavigationView隐藏ActionBar时跳转

Question

我试图仅在某些片段中显示ActionBar：

    override fun onResume() {
    super.onResume()
    (requireActivity() as AppCompatActivity).supportActionBar?.show()
}


override fun onPause() {
    super.onPause()
    (requireActivity() as AppCompatActivity).supportActionBar?.hide()
}

但是由于某种原因，每次我将其隐藏在底部导航栏“跳转”中

MainActivity.xml的代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <fragment
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        app:defaultNavHost="true"
        app:navGraph="@navigation/mobile_navigation" />

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="?android:attr/windowBackground"
        app:itemBackground="@color/colorPrimary"
        app:itemIconTint="@drawable/selector"
        app:itemTextColor="@drawable/selector"
        app:menu="@menu/bottom_nav_menu" />
</LinearLayout>

Answer 1

使用

NoActionBar

主题，例如您的活动为Theme.MaterialComponents.Light.NoActionBar。