在安卓系统中创建多级滚动菜单(如Camera360应用程序)

在安卓系统中创建多级滚动菜单，可以通过使用RecyclerView和ExpandableListView来实现。

RecyclerView是一个强大的列表控件，可以用于显示大量数据，并支持滚动和复用视图。它可以用来创建多级滚动菜单的父级菜单列表。
ExpandableListView是一个可扩展的列表控件，可以显示分组和子项。它可以用来创建多级滚动菜单的子菜单列表。

下面是一个示例代码，演示如何在安卓系统中创建多级滚动菜单：

首先，在布局文件中添加一个RecyclerView和一个ExpandableListView：

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/parentRecyclerView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<ExpandableListView
    android:id="@+id/childExpandableListView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

在Java代码中，首先准备数据源，包括父级菜单和子菜单的数据：

List<String> parentMenuList = Arrays.asList("菜单1", "菜单2", "菜单3");
Map<String, List<String>> childMenuMap = new HashMap<>();
childMenuMap.put("菜单1", Arrays.asList("子菜单1-1", "子菜单1-2", "子菜单1-3"));
childMenuMap.put("菜单2", Arrays.asList("子菜单2-1", "子菜单2-2"));
childMenuMap.put("菜单3", Arrays.asList("子菜单3-1", "子菜单3-2", "子菜单3-3", "子菜单3-4"));

创建适配器类来绑定数据源和视图：

public class MenuAdapter extends RecyclerView.Adapter<MenuAdapter.ParentViewHolder> {
    private List<String> parentMenuList;
    private Map<String, List<String>> childMenuMap;

    public MenuAdapter(List<String> parentMenuList, Map<String, List<String>> childMenuMap) {
        this.parentMenuList = parentMenuList;
        this.childMenuMap = childMenuMap;
    }

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

    @Override
    public void onBindViewHolder(@NonNull ParentViewHolder holder, int position) {
        String parentMenu = parentMenuList.get(position);
        holder.parentMenuTextView.setText(parentMenu);

        List<String> childMenuList = childMenuMap.get(parentMenu);
        ChildMenuAdapter childMenuAdapter = new ChildMenuAdapter(childMenuList);
        holder.childMenuExpandableListView.setAdapter(childMenuAdapter);
    }

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

    public static class ParentViewHolder extends RecyclerView.ViewHolder {
        TextView parentMenuTextView;
        ExpandableListView childMenuExpandableListView;

        public ParentViewHolder(@NonNull View itemView) {
            super(itemView);
            parentMenuTextView = itemView.findViewById(R.id.parentMenuTextView);
            childMenuExpandableListView = itemView.findViewById(R.id.childMenuExpandableListView);
        }
    }
}

public class ChildMenuAdapter extends BaseExpandableListAdapter {
    private List<String> childMenuList;

    public ChildMenuAdapter(List<String> childMenuList) {
        this.childMenuList = childMenuList;
    }

    @Override
    public int getGroupCount() {
        return 1;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return childMenuList.size();
    }

    @Override
    public Object getGroup(int groupPosition) {
        return null;
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return null;
    }

    @Override
    public long getGroupId(int groupPosition) {
        return 0;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return 0;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_child_menu_group, parent, false);
        }
        TextView groupTextView = convertView.findViewById(R.id.groupTextView);
        groupTextView.setText("子菜单");
        return convertView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_child_menu, parent, false);
        }
        TextView childTextView = convertView.findViewById(R.id.childTextView);
        String childMenu = childMenuList.get(childPosition);
        childTextView.setText(childMenu);
        return convertView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }
}

最后，在Activity或Fragment中设置RecyclerView的布局管理器和适配器：

RecyclerView parentRecyclerView = findViewById(R.id.parentRecyclerView);
ExpandableListView childExpandableListView = findViewById(R.id.childExpandableListView);

parentRecyclerView.setLayoutManager(new LinearLayoutManager(this));
MenuAdapter menuAdapter = new MenuAdapter(parentMenuList, childMenuMap);
parentRecyclerView.setAdapter(menuAdapter);

childExpandableListView.setAdapter(menuAdapter.getChildMenuAdapter());

这样，就可以在安卓系统中创建一个类似Camera360应用程序的多级滚动菜单。请注意，上述代码仅为示例，实际应用中可能需要根据具体需求进行适当修改和优化。

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