android如何管理导航栏中的碎片而不丢失数据

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

FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

// 创建一个新的碎片实例
MyFragment fragment = new MyFragment();

// 将碎片添加到容器中
fragmentTransaction.add(R.id.fragment_container, fragment);

// 提交事务
fragmentTransaction.commit();

FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

// 创建一个新的碎片实例
AnotherFragment fragment = new AnotherFragment();

// 替换当前的碎片
fragmentTransaction.replace(R.id.fragment_container, fragment);

// 添加到返回栈，以便用户按返回键时能够返回到之前的碎片
fragmentTransaction.addToBackStack(null);

// 提交事务
fragmentTransaction.commit();

Bundle bundle = new Bundle();
bundle.putString("key", "value");

AnotherFragment fragment = new AnotherFragment();
fragment.setArguments(bundle);

Bundle bundle = getArguments();
String value = bundle.getString("key");