如何在列表视图中保留列表项时在appbar中显示删除和编辑？

<!-- res/layout/activity_main.xml -->
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <com.google.android.material.appbar.MaterialToolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:title="List View"
            app:navigationIcon="@drawable/ic_menu"
            app:menu="@menu/app_bar_menu" />

    </com.google.android.material.appbar.AppBarLayout>

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>

<!-- res/menu/app_bar_menu.xml -->
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/action_edit"
        android:icon="@drawable/ic_edit"
        android:title="Edit"
        app:showAsAction="ifRoom" />
    <item
        android:id="@+id/action_delete"
        android:icon="@drawable/ic_delete"
        android:title="Delete"
        app:showAsAction="ifRoom" />
</menu>

// MainActivity.java
public class MainActivity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private List<Item> itemList;
    private ItemAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        itemList = new ArrayList<>();
        // 初始化itemList数据

        adapter = new ItemAdapter(itemList);
        recyclerView.setAdapter(adapter);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.app_bar_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_edit:
                // 处理编辑操作
                editItem();
                return true;
            case R.id.action_delete:
                // 处理删除操作
                deleteItem();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    private void editItem() {
        // 实现编辑逻辑
    }

    private void deleteItem() {
        // 实现删除逻辑
    }
}

// ItemAdapter.java
public class ItemAdapter extends RecyclerView.Adapter<ItemAdapter.ItemViewHolder> {

    private List<Item> itemList;

    public ItemAdapter(List<Item> itemList) {
        this.itemList = itemList;
    }

    @NonNull
    @Override
    public ItemViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false);
        return new ItemViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ItemViewHolder holder, int position) {
        Item item = itemList.get(position);
        holder.textView.setText(item.getText());
    }

    @Override
    public int getItemCount() {
        return itemList.size();
    }

    static class ItemViewHolder extends RecyclerView.ViewHolder {
        TextView textView;

        ItemViewHolder(View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.textView);
        }
    }
}