Question

我有一个数据结构，其中每个节点可以包含n个相同类型的子节点。我希望将这些显示为每个孩子按照其深度＆＃34;列出的列表。我已经有一个工作的回收站视图，显示顶级节点。我将如何继续展示子节点？

节点类看起来像这样：

public class Node
{
    private ArrayList<Node> children = new ArrayList<Node>();
    private String name;

    public Node(String name)
    {
        this.name = name;
    }

    public void addChild(Node node)
    {
        this.children.add(node);
    }

    public ArrayList<Node> getChildren()
    {
        return this.children;
    }

    public String getName()
    {
        return this.name;
    }
}

基本上，我想要的结果是这样的：

Node A
    Node A's Child A
    Node A's Child B
Node B
    Node B's Child A
        Node B's Child A's Child A
        Node B's Child A's Child B
    Node B's Child B
        Node B's Child B's Child A
Node C

Answer 1

您好这可能为时已晚，但我仍然发现解决方案可能对您和其他人有帮助

并感谢 TellH 提供精美的图书馆

https://github.com/TellH/RecyclerTreeView

创建一个Java bean类并实现LayoutItemType，以将项目布局ID附加到它上面。

public class Dir implements LayoutItemType {
    public String dirName;

    public Dir(String dirName) {
        this.dirName = dirName;
    }

    @Override
    public int getLayoutId() {
      return R.layout.item_dir;
  }

}

创建一个ViewBinder以将视图与数据bean绑定。如您所见，provideViewHolder（View itemView）对应于RecyclerView中的onCreateViewHolder，而bindView对应于RecyclerView中的onBindViewHolder。

public class FileNodeBinder extends    TreeViewBinder<FileNodeBinder.ViewHolder> {
  @Override
  public ViewHolder provideViewHolder(View itemView) {
    return new ViewHolder(itemView);
  }

  @Override
  public void bindView(ViewHolder holder, int position, TreeNode node) {
     File fileNode = (File) node.getContent();
     holder.tvName.setText(fileNode.fileName);
  }

  @Override
  public int getLayoutId() {
      return R.layout.item_file;
  }

  public class ViewHolder extends TreeViewBinder.ViewHolder {
    public TextView tvName;

    public ViewHolder(View rootView) {
       super(rootView);
       this.tvName = (TextView) rootView.findViewById(R.id.tv_name);
   }
  }
}

将TreeNode添加到TreeViewAdapter。

  List<TreeNode> nodes = new ArrayList<>();
    TreeNode<Dir> app = new TreeNode<>(new Dir("app"));
    nodes.add(app);
    app.addChild(
            new TreeNode<>(new Dir("manifests"))
                    .addChild(new TreeNode<>(new     File("AndroidManifest.xml")))
    );

     app.addChild(
        new TreeNode<>(new Dir("java")).addChild(
                new TreeNode<>(new Dir("tellh")).addChild(
                        new TreeNode<>(new Dir("com")).addChild(
                                new TreeNode<>(new Dir("recyclertreeview"))
                                        .addChild(new TreeNode<>(new File("Dir")))
                                        .addChild(new TreeNode<>(new File("DirectoryNodeBinder")))
                                        .addChild(new TreeNode<>(new File("File")))
                                        .addChild(new TreeNode<>(new File("FileNodeBinder")))
                                        .addChild(new TreeNode<>(new File("TreeViewBinder")))
                        )
                )
        )
);
 TreeNode<Dir> res = new TreeNode<>(new Dir("res"));
    nodes.add(res);
    res.addChild(
            new TreeNode<>(new Dir("layout"))
                      .addChild(new TreeNode<>(new File("activity_main.xml")))
                    .addChild(new TreeNode<>(new File("item_dir.xml")))
                    .addChild(new TreeNode<>(new File("item_file.xml")))
    );
     res.addChild(
            new TreeNode<>(new Dir("mipmap"))
                .addChild(new TreeNode<>(new File("ic_launcher.png")))
    );
    TreeViewAdapter adapter = new TreeViewAdapter(nodes,     Arrays.asList(new FileNodeBinder(), new DirectoryNodeBinder()));
    rv.setAdapter(adapter);

将TreeNodeListener设置为TreeViewAdapter

adapter.setOnTreeNodeListener(new TreeViewAdapter.OnTreeNodeListener() {
        @Override
        public boolean onClick(TreeNode node, RecyclerView.ViewHolder holder) {
            if (!node.isLeaf()) {
                //Update and toggle the node.
                onToggle(!node.isExpand(), holder);
            }
            return false;
        }

        @Override
        public void onToggle(boolean isExpand, RecyclerView.ViewHolder holder) {
            DirectoryNodeBinder.ViewHolder dirViewHolder = (DirectoryNodeBinder.ViewHolder) holder;
            final ImageView ivArrow = dirViewHolder.getIvArrow();
            int rotateDegree = isExpand ? 90 : -90;
           ivArrow.animate().rotationBy(rotateDegree)
                     .start();
        }
    });

如何在回收站视图中显示嵌套（或＆＃39;树＆＃39;）数据？

1 个答案: