先上效果圖:git
public abstract class BaseTreeRVAdapter<T extends RecyclerView.ViewHolder, M extends Tree> extends BaseRVAdapterV2<T, M> { @Override public void onBindViewHolder(T holder, final int position) { try { getLevel(position, mDatas, new PosBean()); } catch (StopMsgException ex) { int type = Integer.parseInt(ex.getMessage()); M tree = ex.getTree(); onBindViewHolder(type, tree, holder); } } @Override public int getItemViewType(int position) { try { getLevel(position, mDatas, new PosBean()); } catch (StopMsgException ex) { return Integer.parseInt(ex.getMessage()); } return 0; } @Override public int getItemCount() { return getTotal(mDatas); } protected abstract void onBindViewHolder(int type, M tree, T holder); public List<M> getDatas() { return mDatas; } public void setDatas(List<M> info) { if (info != null) { mDatas = info; } else { mDatas.clear(); } notifyDataSetChanged(); } }
註釋1:主要是計算當前給的數據他的item個數,會根據是否展開的狀態來統總個數github
註釋2:計算當前的postion對應的item層級,來顯示對應的item佈局數據結構
public class TreeListAdapter extends BaseTreeRVAdapter<RecyclerView.ViewHolder, T extends Tree> { @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view; RecyclerView.ViewHolder vh; switch (viewType) { case 0: ...... break; case 1: ...... break; case 2: ...... break; case 3: case 4: ...... } return vh; } @Override protected void onBindViewHolder(int type, final DiscountItem itemCategoryListBean, RecyclerView.ViewHolder holder) { switch (type) { case 0: ...... break; case 1: ...... break; case 2: ...... break; case 3: case 4: ...... } } }
必須實現的幾個方法:maven
int getLevel();//每一個item的層級,好比一級就是0,二級就返回1,這裏的0和1能夠本身定義,後面就是根據這個來選擇哪一種樣式的item List<T> getChilds();//返回的子列表,好比當前類是一級的話,那麼這個方法返回的是二級的列表數據 boolean isExpand();//是否展開,true展開,false不展開,通常就是點擊下去修改這個值刷新adapter,就能達到展開仍是摺疊的目的了
step 1. Add it in your root build.gradle at the end of repositories: allprojects { repositories { ... maven { url 'https://jitpack.io' } } } Step 2. Add the dependency dependencies { implementation 'com.github.WelliJohn:MultiLevelRecyclerView:0.0.1' }
多級列表示例,若是以爲有用,還請點個贊。ide