如何在特定片段上应用抽屉布局？

Question

我有以下问题：

我想使用导航组件，因此我只有一个活动（MainActivity）和几个片段。

我有两种类型的片段：验证内容和实际应用程序。 实际应用包含抽屉布局，并且身份验证内容只能位于约束布局中。

但问题是身份验证片段还显示抽屉布局的状态栏。

我尝试隐藏这些片段上的操作栏，调用 ((AppCompatActivity)getActivity()).getSupportActionBar().hide(); 但这不起作用，我在屏幕顶部看到了一个黑色空间。

有没有什么方法可以将抽屉布局应用到特定的片段或通用更好的方法来获得这种行为？

MainActivity.java

public class MainActivity extends AppCompatActivity
{
    private NavController navController;
    private DrawerLayout drawerLayout;
    private AppBarConfiguration appBarConfiguration;

    private NavController.OnDestinationChangedListener listener;


    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        navController = Navigation.findNavController(this, R.id.fragment);
        drawerLayout = findViewById(R.id.drawer_layout);
        NavigationView navigationView = findViewById(R.id.navigationView);
        NavigationUI.setupWithNavController(navigationView, navController);

        appBarConfiguration = new AppBarConfiguration.Builder(R.id.firstFragment, R.id.secondFragment)
                .setOpenableLayout(drawerLayout)
                .build();
        NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);

        navController.addOnDestinationChangedListener((_c, destination, _b) ->
        {
            if (destination.getId() == R.id.mainFragment ||
                    destination.getId() == R.id.loginFragment ||
                    destination.getId() == R.id.registerUserFragment)
                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
            else
                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
        });

    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout 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/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context=".MainActivity">


    <fragment
        android:id="@+id/fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginStart="1dp"
        android:layout_marginTop="1dp"
        android:layout_marginEnd="1dp"
        android:layout_marginBottom="1dp"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/my_nav" />

    <com.google.android.material.navigation.NavigationView
        android:id="@+id/navigationView"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        app:menu="@menu/drawer_menu" />
</androidx.drawerlayout.widget.DrawerLayout>

my_nav.xml

<?xml version="1.0" encoding="utf-8"?>
<navigation 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/my_nav"
    app:startDestination="@id/mainFragment">

    <fragment
        android:id="@+id/firstFragment"
        android:name="com.mioai.gamehub.FirstFragment"
        android:label="fragment_first"
        tools:layout="@layout/fragment_first">
        <action
            android:id="@+id/navigateToSecondFragment"
            app:destination="@id/secondFragment"
            app:enterAnim="@android:anim/fade_in"
            app:exitAnim="@android:anim/fade_out" />
    </fragment>
    <fragment
        android:id="@+id/secondFragment"
        android:name="com.mioai.gamehub.SecondFragment"
        android:label="fragment_second"
        tools:layout="@layout/fragment_second" />
    <fragment
        android:id="@+id/mainFragment"
        android:name="com.mioai.gamehub.MainFragment"
        tools:layout="@layout/fragment_main">
        <action
            android:id="@+id/action_mainFragment_to_firstFragment"
            app:destination="@id/firstFragment" />
        <action
            android:id="@+id/action_mainFragment_to_loginFragment"
            app:destination="@id/loginFragment" />
    </fragment>
    <fragment
        android:id="@+id/loginFragment"
        android:name="com.mioai.gamehub.LoginFragment"
        android:label="fragment_login"
        tools:layout="@layout/fragment_login" >
        <action
            android:id="@+id/action_loginFragment_to_registerUserFragment2"
            app:destination="@id/registerUserFragment" />
    </fragment>
    <fragment
        android:id="@+id/registerUserFragment"
        android:name="com.mioai.gamehub.RegisterUserFragment"
        android:label="fragment_register_user"
        tools:layout="@layout/fragment_register_user" />

</navigation>