PreOrderTreeAdapter

An adapter which can be used for ListView or RecyclerView. It traverses data in pre-order,than builds index internal. It can be used to implement second-level list like ExpandableListView, but not limited to hierarchy depth.

高效先序遍历嵌套的数据的Adapter(内部构建索引)，配合ListView和RecyclerView可方便展示嵌套的数据（不用特地编写相应的数据结构去配合ListView和RecyclerView）. 可以用其实现伪二级列表以及展开／收缩效果（类似ExpandableListView，但层级数不限）。

Demo

Usage

dependency

Gradle： compile 'cn.okayj:preorder-tree-adapter:2.1.0'

code

class MyAdapter extends PreOrderTreeAdapter<Object,ViewHolder> {

    @Override
    protected Object root() {
        return someObject;// return the root of data
    }

    @Override
    protected int getChildSize(Object someNode) {
        // return the size of children of someNode

        // You can return the exact size or 0 to achieve collapsible feature.
        // Don't forget notify this adapter.

        //返回孩子数量

        //可以根据需求返回实际的数量或者0，以达到展开／收缩的效果。
        //改变数量不要忘记notify
    }

    @Override
    protected Object getChild(Object parent, int childPosition) {
        // return the child node of parent
    }



    @Override
    protected int getViewTypeCount() {
        //..
    }

    @Override
    protected int getViewType(Content content, int depth) {
        //..
    }

    @Override
    protected ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
        //..
    }

    @Override
    protected void onBindViewHolder(ViewHolder viewHolder, Content data) {
        //..
    }

}

listAdapter = new MyAdapter().asListAdapter();
// or
// listAdapter = new ListViewAdapter(new MyAdapter().buildModel()); // you can extend ListViewAdapter to add your feature for ListView

listView.setAdapter(listAdapter);

change

License

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.