如何在Java(Android)数组中更新listview (简单购物清单应用)的值

// 创建适配器类
public class ShoppingListAdapter extends BaseAdapter {
    private List<String> itemList;
    private Context context;

    public ShoppingListAdapter(Context context, List<String> itemList) {
        this.context = context;
        this.itemList = itemList;
    }

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

    @Override
    public Object getItem(int position) {
        return itemList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(context);
            convertView = inflater.inflate(android.R.layout.simple_list_item_1, parent, false);
        }

        TextView textView = convertView.findViewById(android.R.id.text1);
        textView.setText(itemList.get(position));

        return convertView;
    }
}

// 在Activity或Fragment中使用适配器
public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private List<String> itemList;
    private ShoppingListAdapter adapter;

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

        listView = findViewById(R.id.listView);
        itemList = new ArrayList<>();
        itemList.add("Item 1");
        itemList.add("Item 2");
        itemList.add("Item 3");

        adapter = new ShoppingListAdapter(this, itemList);
        listView.setAdapter(adapter);
    }

    // 更新数据源中的值
    private void updateItem(int position, String newItem) {
        itemList.set(position, newItem);
        adapter.notifyDataSetChanged();
    }
}