购物车（仿订餐）
效果图
Activity页面
public class MainActivity extends AppCompatActivity implements MyInterFace {
private TextView mSumPrice;
private TextView mCount;
private RecyclerView mLeftRecycler, mRightRecycler;
private Presenter presenter;
private com.example.lee.shopping_lx4.mLeftAdapter mLeftAdapter;
private com.example.lee.shopping_lx4.mRightAdapter mRightAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSumPrice = findViewById(R.id.goods_sum_price);
mCount = findViewById(R.id.goods_number);
mLeftRecycler = findViewById(R.id.left_recycler);
mRightRecycler = findViewById(R.id.right_recycler);
//p层
presenter = new Presenter(this);
mLeftRecycler.setLayoutManager(new LinearLayoutManager(this));
mRightRecycler.setLayoutManager(new LinearLayoutManager(this));
mLeftAdapter = new mLeftAdapter(this);
//点击时,调用点击接口
mLeftAdapter.setOnItemClickListenter(new mLeftAdapter.OnItemClickListenter() {
@Override
public void onItemClick(Shop shop) {
mRightAdapter.clearList();//清空数据
mRightAdapter.addItem(shop.getList());
mRightAdapter.notifyDataSetChanged();
}
});
mRightAdapter = new mRightAdapter(this);
//点击加减，计算总价和总数
mRightAdapter.setOnNum(new mRightAdapter.OnNum() {
@Override
public void onNum() {
//将商品列表传入
calculatePrice(mLeftAdapter.getList());
}
});
//设置适配器
mLeftRecycler.setAdapter(mLeftAdapter);
mRightRecycler.setAdapter(mRightAdapter);
//调用p层
presenter.show();
}
//计算价格和计算总数
private void calculatePrice(List list) {
double totalPrice = 0;
int totalNum = 0;
for (int i = 0; i < list.size(); i++) {
Shop shop = list.get(i);
for (int j = 0; j < shop.getList().size(); j++) {
Bean bean = shop.getList().get(j);
//计算价格
totalPrice = totalPrice + bean.getNum() * bean.getPrice();
totalNum = totalNum + bean.getNum();
}
}
mSumPrice.setText("总价："+totalPrice);
mCount.setText(""+totalNum);
}
//请求网络成功
@Override
public void success(Recult data) {
List data1 = (List) data.getData();
//计算数量和总价
calculatePrice(data1);
mLeftAdapter.addItem(data1);
//得到默认选中的shop，设置上颜色和背景
Shop shop = data1.get(1);
shop.setTextColor(0xff000000);
shop.setBackground(R.color.white);
mRightAdapter.addItem(shop.getList());
//刷新适配器
mRightAdapter.notifyDataSetChanged();
mLeftAdapter.notifyDataSetChanged();
}
//请求网络失败
@Override
public void fail(Recult recult) {
Toast.makeText(this, "" + recult.getMsg(), Toast.LENGTH_SHORT).show();
}
} 左边adapter页面
class mLeftAdapter extends RecyclerView.Adapter {
private Context context;
private List list;
//点击接口
private OnItemClickListenter onItemClickListenter;
public void setOnItemClickListenter(OnItemClickListenter onItemClickListenter) {
this.onItemClickListenter = onItemClickListenter;
}
public interface OnItemClickListenter {
void onItemClick(Shop shop);
}
public mLeftAdapter(Context context) {
this.context = context;
this.list = new ArrayList<>();
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(context).inflate(R.layout.recycler_left_item, viewGroup, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder viewHolder, int i) {
final Shop shop = list.get(i);
viewHolder.textView.setText(shop.getSellerName());
viewHolder.textView.setBackgroundResource(shop.getBackground());
viewHolder.textView.setTextColor(shop.getTextColor());
//点击切换视图
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//设置点击颜色
for (int j = 0; j getList() {
return list;
}
public void addItem(List data) {
if (data != null) {
list.addAll(data);
}
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView textView;
public ViewHolder(@NonNull View itemView) {
super(itemView);
textView = itemView.findViewById(R.id.left_text);
}
}
} 右边adapter
class mRightAdapter extends RecyclerView.Adapter {
private Context context;
private List list;
public mRightAdapter(Context context) {
this.context = context;
this.list = new ArrayList<>();
}
private OnNum onNum;
public void setOnNum(OnNum onNum) {
this.onNum = onNum;
}
//计算价格数量接口
public interface OnNum{
void onNum();
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(context).inflate(R.layout.recycler_right_item, viewGroup, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder viewHolder, int i) {
//设置值
final Bean bean = list.get(i);
viewHolder.text.setText(bean.getTitle());
viewHolder.price.setText(String.valueOf(bean.getPrice()));
viewHolder.sum.setText(String.valueOf(bean.getNum()));
String images = bean.getImages();
String[] split = images.split("!");
Glide.with(context).load(split[0]).into(viewHolder.image);
//加减数量
viewHolder.jia.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String string = viewHolder.sum.getText().toString();
int i1 = Integer.parseInt(string);
i1++;
bean.setNum(i1);
notifyDataSetChanged();
onNum.onNum();//计算价格
}
});
viewHolder.jian.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String string = viewHolder.sum.getText().toString();
int i1 = Integer.parseInt(string);
i1--;
if (i1 < 1) {
Toast.makeText(context, "数量不能为0", Toast.LENGTH_SHORT).show();
return;
}
bean.setNum(i1);
notifyDataSetChanged();
onNum.onNum();//计算价格
}
});
}
@Override
public int getItemCount() {
return list.size();
}
public void addItem(List list1) {
if (list != null) {
list.addAll(list1);
}
}
public void clearList() {
list.clear();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView text;
TextView price;
ImageView image;
Button jia;
Button jian;
TextView sum;
public ViewHolder(@NonNull View itemView) {
super(itemView);
text = itemView.findViewById(R.id.text);
price = itemView.findViewById(R.id.text_price);
image = itemView.findViewById(R.id.image);
jia = itemView.findViewById(R.id.jia);
jian = itemView.findViewById(R.id.jian);
sum = itemView.findViewById(R.id.sum);
}
}
} p层 m层 还有bean类与二级列表实现购物车中的一样