购物车

第一步:.xml布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    //RecyclerView
    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv_business"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:background="#FFB6C1"
        android:layout_weight="1">

    </android.support.v7.widget.RecyclerView>


    //底部结算--全选--小计
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        //全选
        <CheckBox
            android:id="@+id/ck_all"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:text="全选"/>
        //总计
        <TextView
            android:id="@+id/tv_count"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="总计:0元"/>
        //结算按钮
        <Button
            android:id="@+id/btn_price"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="#f00"
            android:text="结算"/>
    </LinearLayout>

</LinearLayout>

如下图所示
图中的RecyclerView(rv_business)用来存放我们的第一级数据–商家条目

第二步:MainActivity.java中

public class ShouyeFragment extends Fragment implements Contract_Shopping.View_Interface_Shopping {

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate( R.layout.fragment_shouye, container, false );
        rv_business = view.findViewById( R.id.rv_business );
        ck_all = view.findViewById( R.id.ck_all );
        //新建P层
        presenter_shopping = (Contract_Shopping.Presenter_Interface_Shopping) new Presenter_Shopping();
        //绑定
        presenter_shopping.attahViewShopping( this );
        //交互
        presenter_shopping.requestDataShopping();
        
        return view;
    }

    @Override
    //刷新展示数据
    public void showDataShopping(final String message) {
        getActivity().runOnUiThread( new Runnable() {
            @Override
                public void run() {

                //解析数据--message
                Gson gson = new Gson();
                Shopping_Bean shoppingBean = gson.fromJson( message, Shopping_Bean.class );
                final List<Shopping_Bean.DataBean> data = shoppingBean.getData();
                //设置布局管理器
                LinearLayoutManager manager = new LinearLayoutManager( getContext(), LinearLayoutManager.VERTICAL, false );
                rv_business.setLayoutManager( manager );
                //设置适配器
               businessAdapter = new BusinessAdapter(R.layout.recycle_business,data);
                rv_business.setAdapter( businessAdapter );

				//全选反选
                ck_all.setOnClickListener( new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        for (int i = 0; i < data.size(); i++) {
                            data.get( i ).setBusinessChecked( ck_all.isChecked() );
                            for (int j = 0; j < data.get( i ).getList().size(); j++) {
                                data.get( i ).getList().get( j ).setGoodsChecked( ck_all.isChecked() );
                            }
                        }
                        businessAdapter.notifyDataSetChanged();
                    }

                } );
            }
        } );
    }
}

}
recycle_business布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <CheckBox
            android:id="@+id/ck_business"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <TextView
            android:id="@+id/tv_business_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="店名"/>
    </LinearLayout>
    
    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv_goods"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    </android.support.v7.widget.RecyclerView>



</LinearLayout>

如下图所示

图中的rv_goods用来存放商家下商品的信息

BusinessAdapter适配器
在适配器中完成子商品的展示
public class BusinessAdapter extends BaseQuickAdapter<Shopping_Bean.DataBean,BaseViewHolder> {

 public BusinessAdapter(int layoutResId, @Nullable List<Shopping_Bean.DataBean> data) {
        super( layoutResId, data );
    }

    @Override
    protected void convert(BaseViewHolder helper, Shopping_Bean.DataBean item) {
        //设置商家的名称
        helper.setText( R.id.tv_business_name,item.getSellerName() );
        //设置商家下子商品的条目
        RecyclerView rv_goods = helper.getView( R.id.rv_goods );
        //子商品的数据源--item下的list
        List<Shopping_Bean.DataBean.ListBean> goodslist = item.getList();
        //布局管理器
        LinearLayoutManager manager = new LinearLayoutManager( mContext, LinearLayoutManager.VERTICAL, false );
       //适配器
        GoodsAdapter goodsAdapter = new GoodsAdapter(R.layout.recycle_goods,goodslist);
        rv_goods.setLayoutManager( manager );
        rv_goods.setAdapter( goodsAdapter );

    }

}