Android实现二级购物车的全选加反选、总价功能

import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.util.Log;import android.view.View;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.TextView;import java.util.ArrayList;import wangyaowei.bw.com.shopcart.adapter.ShopAdapter;import wangyaowei.bw.com.shopcart.bean.DataBean;import wangyaowei.bw.com.shopcart.bean.ListBean;import wangyaowei.bw.com.shopcart.bean.ShopBean;import wangyaowei.bw.com.shopcart.presenter.GoodsPresenter;import wangyaowei.bw.com.shopcart.view.GoodsView;public class MainActivity extends AppCompatActivity implements GoodsView { private RecyclerView rlv_shop; private GoodsPresenter goodsPresenter; private CheckBox box_all; private ShopAdapter shopAdapter; private ArrayList<DataBean> data; public TextView sum; public int nums; public Double prices; public double total; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sum = findViewById(R.id.sum); rlv_shop = findViewById(R.id.rlv_shop); LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this); rlv_shop.setLayoutManager(linearLayoutManager); goodsPresenter = new GoodsPresenter(this); goodsPresenter.relaed(); box_all = findViewById(R.id.box_all); } @Override public void onResult(ArrayList<DataBean> data) { this.data=data; shopAdapter = new ShopAdapter(MainActivity.this, data); rlv_shop.setAdapter(shopAdapter); setaaa(); } private void setaaa() { box_all.setOnClickListener(new View.OnClickListener() {  @Override  public void onClick(View v) {  if(box_all.isChecked()){   for(int i=0;i<data.size();i++){   DataBean dataBean = data.get(i);   dataBean.setFlag(true);   ArrayList<ListBean> list = dataBean.getList();   for (int j = 0; j < list.size(); j++) {    ListBean listBean = list.get(j);    listBean.setFlags(true);   }   }  }  else {   for(int i=0;i<data.size();i++){   DataBean dataBean = data.get(i);   dataBean.setFlag(false);   ArrayList<ListBean> list = dataBean.getList();   for (int j = 0; j < list.size(); j++) {    ListBean listBean = list.get(j);    listBean.setFlags(false);   }   }  }  shopAdapter.notifyDataSetChanged();  getPrice();  } }); } private void getPrice() { total = 0; int sums=0; for (int i = 0; i < data.size(); i++) {  DataBean dataBean = data.get(i);  ArrayList<ListBean> list = dataBean.getList();  for (int j = 0; j < list.size(); j++) {  ListBean listBean = list.get(j);  if (listBean.isFlags()){   String num = listBean.getNum();   nums = Integer.valueOf(num);   String price =listBean.getPrice();   prices = Double.valueOf(price);   total += nums * prices;   sums++;  }  } } sum.setText(total +""); }}

public class ShopAdapter extends RecyclerView.Adapter<ShopAdapter.MyViewHolder> { Context context; ArrayList<DataBean> beans; public ShopAdapter(Context context, ArrayList<DataBean> beans) { this.context = context; this.beans = beans; } @NonNull @Override public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) { View view=LayoutInflater.from(context).inflate(R.layout.shop_layout,null,false); MyViewHolder myViewHolder = new MyViewHolder(view); return myViewHolder; } @Override public void onBindViewHolder(@NonNull MyViewHolder myViewHolder, int i) { myViewHolder.name_shop.setText(beans.get(i).getSellerName()); LinearLayoutManager linearLayoutManager = new LinearLayoutManager(context); myViewHolder.rlv_goods.setLayoutManager(linearLayoutManager); ArrayList<ListBean> list = beans.get(i).getList(); GoodsAdapter goodsAdapter = new GoodsAdapter(context, list); myViewHolder.rlv_goods.setAdapter(goodsAdapter); myViewHolder.box_shop.setChecked(beans.get(i).isFlag()); } @Override public int getItemCount() { return beans.size(); } public class MyViewHolder extends RecyclerView.ViewHolder { private final TextView name_shop; private final CheckBox box_shop; private final RecyclerView rlv_goods; public MyViewHolder(@NonNull View itemView) {  super(itemView);  name_shop = itemView.findViewById(R.id.name_shop);  rlv_goods = itemView.findViewById(R.id.rlv_goods);  box_shop = itemView.findViewById(R.id.box_shop); } }}

public class GoodsAdapter extends RecyclerView.Adapter<GoodsAdapter.MyViewHolder> { Context context; ArrayList<ListBean> beans; private int shu; public GoodsAdapter(Context context, ArrayList<ListBean> beans) { this.context = context; this.beans = beans; } @NonNull @Override public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) { View view=LayoutInflater.from(context).inflate(R.layout.goods_layout,null,false); MyViewHolder myViewHolder = new MyViewHolder(view); return myViewHolder; } @Override public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, int i) { myViewHolder.name_goods.setText(beans.get(i).getTitle()); myViewHolder.price_goods.setText(beans.get(i).getPrice()+""); String num = beans.get(i).getNum(); shu = Integer.parseInt(num); myViewHolder.addview.nums.setText(shu +""); Glide.with(context).load(beans.get(i).getImages()).into(myViewHolder.img_goods); myViewHolder.box_goods.setChecked(beans.get(i).isFlags()); myViewHolder.addview.jia.setOnClickListener(new View.OnClickListener() {  @Override  public void onClick(View v) {  shu++;  myViewHolder.addview.nums.setText(shu +"");  } }); myViewHolder.addview.jian.setOnClickListener(new View.OnClickListener() {  @Override  public void onClick(View v) {  if (shu>=1){   shu--;   myViewHolder.addview.nums.setText(shu +"");  }else {   Toast.makeText(context, "已经最少不能减了", Toast.LENGTH_SHORT).show();  }  } }); } @Override public int getItemCount() { return beans.size(); } public class MyViewHolder extends RecyclerView.ViewHolder { private final TextView name_goods,price_goods; private final ImageView img_goods; private final AddView addview; private final CheckBox box_goods; public MyViewHolder(@NonNull View itemView) {  super(itemView);  name_goods = itemView.findViewById(R.id.name_goods);  price_goods = itemView.findViewById(R.id.price_goods);  img_goods = itemView.findViewById(R.id.img_goods);  addview = itemView.findViewById(R.id.addview);  box_goods = itemView.findViewById(R.id.box_goods); } }}