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);  }  } }