購物車簡介

public class MainActivity extends AppCompatActivity implements IView {

private RecyclerView recy_view;
private Presenter presenter;
private CheckBox check;
private ShopAdapter shopAdapter;
private Button jiesuan;
double zongjia;
private TextView price;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    recy_view = findViewById(R.id.recy_view);
    price = findViewById(R.id.price);
    check = findViewById(R.id.check);
    jiesuan = findViewById(R.id.jiesuan);
    presenter = new Presenter(this);
    presenter.onPresenter();
}

@Override
public void onSuccess(final OneBean data) {
    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
    linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    recy_view.setLayoutManager(linearLayoutManager);
    final List<TwoBean> list = data.getData();
    //全選反選
    check.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            for (int i = 0; i <list.size(); i++) {
                list.get(i).setChecked(isChecked);
                for (int j = 0; j <list.get(i).getList().size(); j++) {
                    list.get(i).getList().get(j).setChecked(isChecked);
                }
            }
            shopAdapter.notifyDataSetChanged();
        }
    });
    //總價
    jiesuan.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            zongjia = 0;
            for (int u = 0; u <list.size(); u++) {
                for (int z = 0; z <list.get(u).getList().size(); z++) {
                    if (list.get(u).getList().get(z).isChecked()){
                        String bargainPrice = list.get(u).getList().get(z).getBargainPrice();
                        double vv = Double.parseDouble(bargainPrice);
                        zongjia+=vv;
                    }
                }
            }
            price.setText(zongjia+"");
        }
    });
    shopAdapter = new ShopAdapter(this,list);
    recy_view.setAdapter(shopAdapter);
}

@Override
public void onFilar(String msg) {

}

}

、、、、、加減器
public class Jiajian extends LinearLayout {

private TextView jian;
private TextView jia;
private TextView num;

public Jiajian(Context context) {
    this(context,null);
}

public Jiajian(Context context, AttributeSet attrs) {
    this(context, attrs,-1);
}

public Jiajian(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init(context);
    initJiajian();
}
private void init(Context context) {
    View view = inflate(context, R.layout.jiajianqi, this);
    jian = findViewById(R.id.jian);
    jia = findViewById(R.id.jia);
    num = findViewById(R.id.num);
}
private void initJiajian() {
    jia.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            sum();
        }
    });
    jian.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            jianfa();
        }
    });
}

private void sum() {
    String s = num.getText().toString();
    int i;
    if(!TextUtils.isEmpty(s)&&!s.contains(".")){
        i = Integer.parseInt(s);
        i++;
        num.setText(i+"");
    }
}

private void jianfa() {
    String s = num.getText().toString();
    int i;
    if (!TextUtils.isEmpty(s)&&!s.contains(".")){
        i = Integer.parseInt(s);
        i--;
        if (i<0){
            i=0;
            Toast.makeText(getContext(), "不能小於0", Toast.LENGTH_SHORT).show();
        }
        num.setText(i+"");
    }
}
public void  setNums(int nums){
    if (nums>0){
        num.setText(nums+"");
    }else {
        Toast.makeText(getContext(), "不能小於0", Toast.LENGTH_SHORT).show();
    }
}

}

、、、、、單選adapter

public class ShopAdapter extends RecyclerView.Adapter<ShopAdapter.ViewHolder> {
Context context;
List list;

public ShopAdapter(Context context, List<TwoBean> list) {
    this.context = context;
    this.list = list;
}

@NonNull
@Override
public ShopAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    View view = LayoutInflater.from(context).inflate(R.layout.shop_item, viewGroup, false);
    ViewHolder viewHolder = new ViewHolder(view);
    return viewHolder;
}

@Override
public void onBindViewHolder(@NonNull ShopAdapter.ViewHolder viewHolder, int i) {
    TwoBean twoBean = list.get(i);
    viewHolder.bind(twoBean);
}

@Override
public int getItemCount() {
    return list.size();
}

public class ViewHolder extends RecyclerView.ViewHolder {

    private final TextView shop_name;
    private final RecyclerView shop_view;
    private final CheckBox check_shop;
    private GoodsAdapter goodsAdapter;

    public ViewHolder(@NonNull View itemView) {
        super(itemView);
        check_shop = itemView.findViewById(R.id.check_shop);
        shop_name = itemView.findViewById(R.id.shop_name);
        shop_view = itemView.findViewById(R.id.shop_view);
    }

    public void bind(TwoBean twoBean) {
        String sellerName = twoBean.getSellerName();
        shop_name.setText(sellerName);
        check_shop.setChecked(twoBean.isChecked());
        final List<ThreeBean> list = twoBean.getList();
       check_shop.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
           @Override
           public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
               for (int i = 0; i <list.size(); i++) {
                   list.get(i).setChecked(isChecked);
               }
            goodsAdapter.notifyDataSetChanged();
           }
       });
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(context);
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        shop_view.setLayoutManager(linearLayoutManager);
        goodsAdapter = new GoodsAdapter(context,list);
        shop_view.setAdapter(goodsAdapter);
    }
}

}
、、、、、、、、子adapter

public class GoodsAdapter extends RecyclerView.Adapter<GoodsAdapter.ViewHolder> {
Context context;
List list;

public GoodsAdapter(Context context, List<ThreeBean> list) {
    this.context = context;
    this.list = list;
}

@NonNull
@Override
public GoodsAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
    View view = LayoutInflater.from(context).inflate(R.layout.goods_item, viewGroup, false);
    ViewHolder viewHolder = new ViewHolder(view);
    return viewHolder;
}

@Override
public void onBindViewHolder(@NonNull GoodsAdapter.ViewHolder viewHolder, int i) {
    ThreeBean threeBean = list.get(i);
    viewHolder.bind(threeBean);
}

@Override
public int getItemCount() {
    return list.size();
}

public class ViewHolder extends RecyclerView.ViewHolder {

    private final SimpleDraweeView goods_img;
    private final TextView goods_name;
    private final TextView goods_prcie;
    private final CheckBox check_goods;

    public ViewHolder(@NonNull View itemView) {
        super(itemView);
        goods_img = itemView.findViewById(R.id.goods_img);
        goods_name = itemView.findViewById(R.id.goods_name);
        goods_prcie = itemView.findViewById(R.id.goods_prcie);
        check_goods = itemView.findViewById(R.id.check_goods);

    }

    public void bind(ThreeBean threeBean) {
        check_goods.setChecked(threeBean.isChecked());
        goods_name.setText(threeBean.getSubhead());
        goods_prcie.setText(threeBean.getBargainPrice());
        goods_img.setImageURI(threeBean.getDetailUrl());

    }
}

}