BottomNavigation-为什么一个项目的空间与其余项目不同？

如何解决BottomNavigation-为什么一个项目的空间与其余项目不同？

我创建了一个BottomNav，其中包含3个常规元素和一个“自定义”点，用于“更多菜单”：

但是我不明白为什么它与其他地方会如此不同？唯一的区别是more菜单不是bottom_nav_graph.xml的一部分，因为它是自定义添加的项目。除此之外，它与其他项目一样。

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编辑：评论中的建议似乎确实有效。但是，仍然没有办法让我均匀分配项目或将它们全部等宽以容纳长名称吗？

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bottom_nav_menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/navigation_home_screen"
        android:icon="@drawable/ic_add_white_24dp"
        android:title="@string/title_activity_journey" />

    <item
        android:id="@+id/navigation_sas"
        android:icon="@drawable/ic_check_white_24dp"
        android:title="@string/title_activity_sa" />

    <item
        android:id="@+id/navigation_profile"
        android:icon="@drawable/ic_close_white_24dp"
        android:title="@string/title_profile" />

    <item
        android:id="@+id/navigation_more_menu"
        android:icon="@drawable/ic_more_horiz_24"
        android:title="@string/title_more_menu" />
</menu>

bottom_nav_graph.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/mobile_navigation"
    app:startDestination="@id/navigation_home_screen">

    <fragment
        android:id="@+id/navigation_home_screen"
        android:name="com.dev.solidmind.ui.HomeScreenFragment"
        android:label="@string/title_home"
        tools:layout="@layout/fragment_home_screen" />

    <fragment
        android:id="@+id/navigation_sas"
        android:name="com.dev.solidmind.ui.SA_Fragment"
        android:label="@string/title_activity_sa"
        tools:layout="@layout/fragment_sa" />

    <fragment
        android:id="@+id/navigation_profile"
        android:name="com.dev.solidmind.ui.ProfileFragment"
        android:label="@string/title_profile"
        tools:layout="@layout/fragment_profile" />
</navigation>

activity_main.xml

<?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"
    android:id="@+id/main_root_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@id/nav_view"
        app:layout_constraintHeight_default="percent"
        app:layout_constraintHeight_percent="0.9"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/bottom_nav_graph" />

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/nav_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:background="?android:attr/windowBackground"
        app:itemIconTint="@color/bottom_nav_color_selector"
        app:itemTextColor="@color/bottom_nav_color_selector"
        app:labelVisibilityMode="labeled"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHeight_default="percent"
        app:layout_constraintHeight_percent="0.1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:menu="@menu/bottom_nav_menu" />

</androidx.constraintlayout.widget.ConstraintLayout>

设置BottomNav的代码

private void setUpBottomNavigation() {
        BottomNavigationView bottomNavView = findViewById(R.id.nav_view);
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(
                R.id.navigation_home_screen,R.id.navigation_sas,R.id.navigation_profile,R.id.navigation_more_menu)
                .build();

        NavHostFragment navHostFragment = (NavHostFragment) getSupportFragmentManager().findFragmentById(R.id.nav_host_fragment);
        NavController navController = Objects.requireNonNull(navHostFragment).getNavController();

        NavigationUI.setupActionBarWithNavController(this,navController,appBarConfiguration);
        NavigationUI.setupWithNavController(bottomNavView,navController);

        navController.addOnDestinationChangedListener((controller,destination,arguments) -> {
            if (destination.getId() == R.id.navigation_home_screen) {
                Objects.requireNonNull(getSupportActionBar()).hide();
            } else {
                Objects.requireNonNull(getSupportActionBar()).show();
            }
        });

        bottomNavView.setonNavigationItemSelectedListener(menuItem -> {
            if (menuItem.getItemId() == R.id.navigation_more_menu) {
                openBottomSheet();
                return true;
            } else if (menuItem.getItemId() == R.id.navigation_home_screen) {
                navController.navigate(R.id.navigation_home_screen);
                return true;
            } else if (menuItem.getItemId() == R.id.navigation_sas) {
                navController.navigate(R.id.navigation_sas);
                return true;
            } else if (menuItem.getItemId() == R.id.navigation_profile) {
                navController.navigate(R.id.navigation_profile);
                return true;
            } else return false;
        });
    }