如何使用getter & setter方法获取ExpandableListView上的分组和子项

// 适配器类
public class MyExpandableListAdapter extends BaseExpandableListAdapter {
    private List<String> groups; // 分组数据
    private List<List<String>> children; // 子项数据

    public MyExpandableListAdapter(List<String> groups, List<List<String>> children) {
        this.groups = groups;
        this.children = children;
    }

    // 实现其他方法...

    @Override
    public Object getGroup(int groupPosition) {
        return groups.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return children.get(groupPosition).get(childPosition);
    }
}

// 在Activity或Fragment中使用适配器
public class MainActivity extends AppCompatActivity {
    private ExpandableListView expandableListView;

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

        expandableListView = findViewById(R.id.expandableListView);

        // 创建分组和子项的数据
        List<String> groups = new ArrayList<>();
        groups.add("Group 1");
        groups.add("Group 2");

        List<List<String>> children = new ArrayList<>();
        List<String> children1 = new ArrayList<>();
        children1.add("Child 1-1");
        children1.add("Child 1-2");
        List<String> children2 = new ArrayList<>();
        children2.add("Child 2-1");
        children2.add("Child 2-2");
        children.add(children1);
        children.add(children2);

        // 创建适配器
        MyExpandableListAdapter adapter = new MyExpandableListAdapter(groups, children);

        // 设置适配器
        expandableListView.setAdapter(adapter);

        // 获取分组和子项的数据
        String groupData = (String) adapter.getGroup(0); // 获取第一个分组的数据
        String childData = (String) adapter.getChild(0, 0); // 获取第一个分组的第一个子项的数据
    }
}