最快的Android TreeView出现了！

源码地址：https://github.com/niugao/RecyclerListTreeView

• 基于RecyclerView实现。
• 存储数据的结构并不是Tree，而是一个ArrayList。与所有已知的网上的实现都不一样，大家似乎都跳不出固定思维。 可以比较一下代码量，此实现比其它的少一半都不止。
• 核心是一个表示Tree的类，但它的本质是一个List。对RecyclerView没有任何改动，对Adapter只有少量封装， 使用者不会产生任何陌生感。也就是说你对RecyclerView能做的，现在依然能做。
• 以List的形式表式树，带来很多好处：
  – 没有了递归。该用递归的地方全部变成了循环（Tree不论有多少层都没有栈溢出）。
  – 其次是有序，插入节点时，可以指定它是它爸爸的第几个儿子。
  – 极其适合在RecyclerView中使用。
  – 跟List无异，无论根节点还是子节点都对应RecyclerView中的一行。
  – 不需对RecyclerView做任何改动。

有诗为证

远看像棵树
近看不是树
似树而非树
是为牛逼树

示例

在Gradle中添加依赖：

compile ‘com.niuedu:recyclerlisttreeview:0.1.0’

Adapter:

public class ExampleListTreeAdapter extendsListTreeAdapter<ExampleListTreeAdapter.BaseViewHolder> {//行上弹出菜单的侦听器private PopupMenu.OnMenuItemClickListener itemMenuClickListener;//记录弹出菜单是在哪个行上出现的private ListTree.TreeNode currentNode;//保存子行信息的类public static class ContactInfo{//头像,用于设置给ImageView。private Bitmap bitmap;//标题private String title;//描述private String detail;public ContactInfo(Bitmap bitmap, String title, String detail) {this.bitmap = bitmap;this.title = title;this.detail = detail;}public Bitmap getBitmap() {return bitmap;}public String getTitle() {return title;}public String getDetail() {return detail;}}//构造方法public ExampleListTreeAdapter(ListTree tree,PopupMenu.OnMenuItemClickListener listener){super(tree);this.itemMenuClickListener=listener;}public ListTree.TreeNode getCurrentNode() {return currentNode;}@Overrideprotected BaseViewHolder onCreateNodeView(ViewGroup parent, int viewType){View view = null;LayoutInflater inflater = LayoutInflater.from(parent.getContext());BaseViewHolder vh;//创建不同的行Viewif(viewType==R.layout.contacts_group_item){//最后一个参数必须传trueview = inflater.inflate(viewType,parent,true);vh=new GroupViewHolder(view);}else if(viewType == R.layout.contacts_contact_item){view = inflater.inflate(viewType,parent,true);vh=new ContactViewHolder(view);}else{return null;}return vh;}@Overrideprotected void onBindNodeViewHolder(BaseViewHolder holder, int position) {View view = holder.itemView;//get node at the positionListTree.TreeNode node = tree.getNodeByPlaneIndex(position);if(node.getLayoutResId() == R.layout.contacts_group_item){//group nodeString title = (String)node.getData();GroupViewHolder gvh= (GroupViewHolder) holder;gvh.textViewTitle.setText(title);gvh.textViewCount.setText("0/"+node.getChildrenCount());gvh.aSwitch.setChecked(node.isChecked());gvh.aSwitch.setTag(node);gvh.textViewMenu.setTag(node);}else if(node.getLayoutResId() == R.layout.contacts_contact_item){//child nodeContactInfo info = (ContactInfo) node.getData();ContactViewHolder cvh= (ContactViewHolder) holder;cvh.imageViewHead.setImageBitmap(info.getBitmap());cvh.textViewTitle.setText(info.getTitle());cvh.textViewDetail.setText(info.getDetail());cvh.aSwitch.setChecked(node.isChecked());cvh.aSwitch.setTag(node);}}//组行和联系人行的Holder基类class BaseViewHolder extends ListTreeViewHolder{public BaseViewHolder(View itemView) {super(itemView);}}//将ViewHolder声明为Adapter的内部类，反正外面也用不到class GroupViewHolder extends BaseViewHolder {TextView textViewTitle;TextView textViewCount;Switch aSwitch;TextView textViewMenu;public GroupViewHolder(View itemView) {super(itemView);textViewTitle = itemView.findViewById(R.id.textViewTitle);textViewCount = itemView.findViewById(R.id.textViewCount);aSwitch = itemView.findViewById(R.id.switchChecked);textViewMenu = itemView.findViewById(R.id.textViewMenu);//应响应点击事件而不是CheckedChange事件，因为那样会引起事件的递归触发aSwitch.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {ListTree.TreeNode node = (ListTree.TreeNode) view.getTag();node.setChecked(!node.isChecked());int planeIndex = tree.getNodePlaneIndex(node);//改变所有的子孙们的状态int count =tree.setDescendantChecked(planeIndex,node.isChecked());notifyItemRangeChanged(planeIndex,count+1);}});//点了PopMenu控件，弹出PopMenutextViewMenu.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {ListTree.TreeNode node = (ListTree.TreeNode) v.getTag();currentNode=node;PopupMenu popup = new PopupMenu(v.getContext(), v);popup.setOnMenuItemClickListener(itemMenuClickListener);MenuInflater inflater = popup.getMenuInflater();inflater.inflate(R.menu.menu_item, popup.getMenu());popup.show();}});}}class ContactViewHolder extends BaseViewHolder{ImageView imageViewHead;TextView textViewTitle;TextView textViewDetail;Switch aSwitch;public ContactViewHolder(View itemView) {super(itemView);imageViewHead = itemView.findViewById(R.id.imageViewHead);textViewTitle = itemView.findViewById(R.id.textViewTitle);textViewDetail = itemView.findViewById(R.id.textViewDetail);aSwitch = itemView.findViewById(R.id.switchChecked);//应响应点击事件而不是CheckedChange事件，因为那样会引起事件的递归触发aSwitch.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {ListTree.TreeNode node = (ListTree.TreeNode) view.getTag();node.setChecked(!node.isChecked());int planeIndex = tree.getNodePlaneIndex(node);//改变所有的子孙们的状态int count =tree.setDescendantChecked(planeIndex,node.isChecked());notifyItemRangeChanged(planeIndex,count+1);}});}}
}

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使用Adapter

public class MainActivity extends AppCompatActivityimplements PopupMenu.OnMenuItemClickListener {//保存数据的集合private ListTree tree=new ListTree();//从ListTreeAdapter派生的AdapterExampleListTreeAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);setSupportActionBar(toolbar);//使用Android原生的RecyclerView即可RecyclerView listView = findViewById(R.id.listview);//创建后台数据：一棵树//创建组们，是root node，所有parent为nullListTree.TreeNode groupNode1=tree.addNode(null,"特别关心", R.layout.contacts_group_item);ListTree.TreeNode groupNode2=tree.addNode(null,"我的好友", R.layout.contacts_group_item);ListTree.TreeNode groupNode3=tree.addNode(null,"朋友", R.layout.contacts_group_item);ListTree.TreeNode groupNode4=tree.addNode(null,"家人", R.layout.contacts_group_item);ListTree.TreeNode groupNode5=tree.addNode(null,"同学", R.layout.contacts_group_item);//第二层ExampleListTreeAdapter.ContactInfo contact;Bitmap bitmap= BitmapFactory.decodeResource(getResources(), R.drawable.contacts_normal);contact = new ExampleListTreeAdapter.ContactInfo(bitmap,"王二","[在线]我是王二");ListTree.TreeNode contactNode1=tree.addNode(groupNode2,contact,R.layout.contacts_contact_item);ListTree.TreeNode contactNode2=tree.addNode(groupNode5,contact,R.layout.contacts_contact_item);//再添加一个bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.contacts_normal);contact=new ExampleListTreeAdapter.ContactInfo(bitmap,"王三","[离线]我没有状态");tree.addNode(groupNode2,contact,R.layout.contacts_contact_item);tree.addNode(groupNode5,contact,R.layout.contacts_contact_item);//第三层bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.contacts_normal);contact=new ExampleListTreeAdapter.ContactInfo(bitmap,"东邪","[离线]出来还价");ListTree.TreeNode n=tree.addNode(contactNode1,contact,R.layout.contacts_contact_item);n.setShowExpandIcon(false);//再添加一个bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.contacts_normal);contact=new ExampleListTreeAdapter.ContactInfo(bitmap,"李圆圆","[离线]昨天出门没出去");n=tree.addNode(contactNode1,contact,R.layout.contacts_contact_item);n.setShowExpandIcon(false);adapter=new ExampleListTreeAdapter(tree,this);listView.setLayoutManager(new LinearLayoutManager(this));listView.setAdapter(adapter);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.menu_main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {int id = item.getItemId();//noinspection SimplifiableIfStatementif (id == R.id.action_settings) {return true;}else if(id == R.id.action_del_selected){//删除选中的Nodes，删一个Node时会将其子孙一起删掉tree.removeCheckedNodes();adapter.notifyDataSetChanged();return true;}return super.onOptionsItemSelected(item);}@Overridepublic boolean onMenuItemClick(MenuItem item){switch (item.getItemId()) {case R.id.action_add_item://向当前行增加一个儿子ListTree.TreeNode node = adapter.getCurrentNode();Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.contacts_normal);ExampleListTreeAdapter.ContactInfo contact=new ExampleListTreeAdapter.ContactInfo(bitmap,"New contact","[离线]我没有状态");ListTree.TreeNode childNode = tree.addNode(node,contact,R.layout.contacts_contact_item);adapter.notifyTreeItemInserted(node,childNode);return true;default:return false;}}
}

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