在使用导航组件实现的BottomNavigationView中，每次在片断之间切换时片断都会重新启动

// 创建BottomNavigationView
BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_navigation_view);

// 设置菜单项点击监听器
bottomNavigationView.setOnNavigationItemSelectedListener(item -> {
    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    switch (item.getItemId()) {
        case R.id.menu_item1:
            // 使用hide和show方法切换片断的可见性
            transaction.hide(fragment2);
            transaction.show(fragment1);
            break;
        case R.id.menu_item2:
            transaction.hide(fragment1);
            transaction.show(fragment2);
            break;
    }
    transaction.commit();
    return true;
});

// 创建片断实例
Fragment1 fragment1 = new Fragment1();
Fragment2 fragment2 = new Fragment2();

// 将片断添加到片断容器中
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.add(R.id.fragment_container, fragment1);
transaction.add(R.id.fragment_container, fragment2);
transaction.commit();