如何将底部导航栏的起始默认片段设置为中心/中间片段？

<com.google.android.material.bottomnavigation.BottomNavigationView
    android:id="@+id/bottomNavigationView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:menu="@menu/bottom_navigation_menu" />

BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigationView);
bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        // 处理导航项的选择事件
        switch (item.getItemId()) {
            case R.id.menu_item1:
                // 切换到片段1
                getSupportFragmentManager().beginTransaction()
                        .replace(R.id.fragmentContainer, Fragment1.class, null)
                        .commit();
                return true;
            case R.id.menu_item2:
                // 切换到片段2
                getSupportFragmentManager().beginTransaction()
                        .replace(R.id.fragmentContainer, Fragment2.class, null)
                        .commit();
                return true;
            case R.id.menu_item3:
                // 切换到片段3
                getSupportFragmentManager().beginTransaction()
                        .replace(R.id.fragmentContainer, Fragment3.class, null)
                        .commit();
                return true;
        }
        return false;
    }
});

<FrameLayout
    android:id="@+id/fragmentContainer"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

// 设置默认显示的片段为中心/中间片段
getSupportFragmentManager().beginTransaction()
        .replace(R.id.fragmentContainer, CenterFragment.class, null)
        .commit();