在我的Android应用程序中，我的主要活动中有4个片段，我可以向左和向右滑动来访问它们。
现在，每个片段都有与activity_main.xml中布局相同的应用栏：

<?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"
    android:background="?android:attr/windowBackground"
    tools:context=".ui.MainActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appBarLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="56dp"
            android:background="@color/colorPrimary"
            android:contentDescription="@string/content_basic_toolbar"
            android:theme="@style/ThemeOverlay.AppCompat.Dark"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:titleTextColor="@color/white"/>

    </com.google.android.material.appbar.AppBarLayout>

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottom_navigation"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:background="@color/bottomNavColor"
        app:itemIconTint="@drawable/bottom_nav_color_selector"
        app:itemTextColor="@drawable/bottom_nav_color_selector"
        app:labelVisibilityMode="labeled"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/navigation" />

    <ImageButton
        android:id="@+id/user_button"
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:layout_marginEnd="8dp"
        android:background="#00FFFFFF"
        android:elevation="4dp"
        android:contentDescription="@string/user"
        app:layout_constraintBottom_toBottomOf="@+id/appBarLayout"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="@+id/appBarLayout"
        app:srcCompat="@drawable/ic_user" />

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/mainNavigationFragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@+id/bottom_navigation"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/appBarLayout"
        app:navGraph="@navigation/main_nav_graph" />

</androidx.constraintlayout.widget.ConstraintLayout>

不过，我想改变其中一个片段（家庭片段）的应用程序栏，使其有一个居中的标志和更高的高度。
这是我的MainActivity.kt，其中配置了应用栏/导航控制器/片段：

@AndroidEntryPoint
class MainActivity : AppCompatActivity() {

    lateinit var user: ImageButton
    lateinit var toolbar: Toolbar
    lateinit var bottomNavigationView: BottomNavigationView

    lateinit var loginViewModel: LoginViewModel
    lateinit var navController: NavController

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding: ActivityMainBinding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)

        loginViewModel = ViewModelProvider(this).get(LoginViewModel::class.java)

        toolbar = binding.toolbar
        bottomNavigationView = binding.bottomNavigation
        user = binding.userButton

        setSupportActionBar(toolbar)
        supportActionBar?.setDisplayHomeAsUpEnabled(true)

        Fresco.initialize(this)

        val navHostFragment = supportFragmentManager.findFragmentById(R.id.mainNavigationFragment) as NavHostFragment
        navController = navHostFragment.navController
        bottomNavigationView.setupWithNavController(navController)

        // Set up tool bar with navController and appBarConfiguration
        val appBarConfiguration = AppBarConfiguration(
            setOf(
                R.id.homeFragment,
                R.id.mapFragment,
                R.id.resourcesFragment,
                R.id.moreFragment
            )
        )
        toolbar.setupWithNavController(navController, appBarConfiguration)

        // Show navigation bar and user bottom on top level fragments
        navController.addOnDestinationChangedListener { _, destination, _ ->
            when (destination.id) {
                R.id.homeFragment,
                R.id.mapFragment,
                R.id.resourcesFragment,
                R.id.moreFragment -> {
                    bottomNavigationView.visibility = View.VISIBLE
                    user.visibility = View.VISIBLE
                }
                else -> {
                    bottomNavigationView.visibility = View.GONE
                    user.visibility = View.GONE
                }
            }
        }

        user.setOnClickListener {
            loginViewModel.loadAccount(this@MainActivity, binding.root) {
                navController.navigate(R.id.userFragment)
            }

        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (requestCode == 1) {
            user.callOnClick()
        }
    }

}

到目前为止，我已经尝试过：
在我的HomeFragment.kt onCreateView中，我想在其中更改应用程序栏/工具栏，我添加了以下代码行：

(activity as MainActivity?)!!.supportActionBar!!.setLogo(R.drawable.logo_mt)

这成功地把我的标志在中心，但它改变了每一个碎片应用程序栏，而不仅仅是主页碎片。我还希望能够编辑标志的大小和工具栏的大小。