京东购物车
最下面是0级列表
商家 -- 1级
商品 -- 2级
- 需要注意的三个点：
- 0 -- 选中/未选中
- 1 -- 选中/未选中
- 2 -- 选中/未选中
CheckBox会发生 复用问题
给它设置点击事件，每次都要对每个位置的box状态进行记录
圆角矩形、扁平化设计风格
F9:0A:2A:29:99:84:EB:F3:E9:7D:CC:9D:E1:AE:06:68:58:CC:52:06
- 购物车ShopperAdapter()
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/** * ShopperAdapter * 商家适配器 */ public class ShopperAdapter extends RecyclerView.Adapter{ private Context context; private List productList = shopper.getList(); for (Product product : productList) { product.setChecked(isChecked); } // 子类商品的适配器刷新 adapter.notifyDataSetChanged(); // } // 当点击一级条目的时候，外部的全选按钮状态发生变化 if (shopperClickListener != null) { shopperClickListener.onShopperClick(position, isChecked); } } }); } @Override public int getItemCount() { return list.size(); } class ViewHolder extends RecyclerView.ViewHolder { private CheckBox cbSHopper; private TextView txtShopperName; private RecyclerView rvProduct; public ViewHolder(View itemView) { super(itemView); cbSHopper = itemView.findViewById(R.id.cb_shopper); txtShopperName = itemView.findViewById(R.id.txt_shopper_name); rvProduct = itemView.findViewById(R.id.rv_product); } } }
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- 商品ShopperAdapter
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/** * ProductAdapter 商品适配器 */ public class ProductAdapter extends RecyclerView.Adapter{ private Context context; private List list; // 二级条目（商品）点击监听 public interface OnProductClickListener { void onProductClick(int position, boolean isChecked); } private OnProductClickListener productClickListener; public void setOnProductClickListener(OnProductClickListener listener) { this.productClickListener = listener; } // 加减器发生变化的监听 public interface OnAddDecreaseProductListener { void onChange(int position, int num); } private OnAddDecreaseProductListener productListener; public void setOnAddDecreaseProductListener(OnAddDecreaseProductListener listener) { this.productListener = listener; } public ProductAdapter(Context context, List list) { this.context = context; this.list = list; } @NonNull @Override public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View v = View.inflate(context, R.layout.item_product, null); ViewHolder holder = new ViewHolder(v); return holder; } @Override public void onBindViewHolder(@NonNull ViewHolder holder, final int position) { final Product product = list.get(position); String images = product.getImages(); // 商品图片 if (!TextUtils.isEmpty(images)) { String[] strings = images.split("\\|"); if (strings.length > 0) { Glide.with(context) .load(StringUtils.https2Http(strings[0])) .into(holder.imgProduct); } } holder.txtProductName.setText(product.getTitle()); holder.txtSinglePriice.setText(String.valueOf(product.getPrice())); holder.advProduct.setNum(product.getNum()); // 加减器添加点击事件 holder.advProduct.setOnAddDecreaseClickListener(new AddDecreaseView.OnAddDecreaseClickListener() { @Override public void add(int num) { product.setNum(num); if (productListener != null) { productListener.onChange(position, num); } } @Override public void decrease(int num) { product.setNum(num); if (productListener != null) { productListener.onChange(position, num); } } }); // 商品的复选框 holder.cbProduct.setOnCheckedChangeListener(null); holder.cbProduct.setChecked(product.isChecked()); holder.cbProduct.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { product.setChecked(isChecked); if (productClickListener != null) { productClickListener.onProductClick(position, isChecked); } } }); } @Override public int getItemCount() { return list.size(); } class ViewHolder extends RecyclerView.ViewHolder { private CheckBox cbProduct; private ImageView imgProduct; private TextView txtProductName; private TextView txtSinglePriice; private AddDecreaseView advProduct; public ViewHolder(View itemView) { super(itemView); cbProduct = itemView.findViewById(R.id.cb_product); imgProduct = itemView.findViewById(R.id.img_product); txtSinglePriice = itemView.findViewById(R.id.txt_single_price); advProduct = itemView.findViewById(R.id.adv_product); txtProductName = itemView.findViewById(R.id.txt_product_name); } } }
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- 自定义加减器
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/** * AddDecreaseView，自定义加减器 */ public class AddDecreaseView extends RelativeLayout implements View.OnClickListener { private TextView txtAdd; private TextView txtDecrease; private TextView txtNum; private int num; public interface OnAddDecreaseClickListener { void add(int num); void decrease(int num); } private OnAddDecreaseClickListener listener; public void setOnAddDecreaseClickListener(OnAddDecreaseClickListener listener) { this.listener = listener; } public AddDecreaseView(Context context) { this(context, null); } public AddDecreaseView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public AddDecreaseView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context); } private void init(Context context) { View.inflate(context, R.layout.item_add_decrease, this); txtAdd = findViewById(R.id.txt_add); txtDecrease = findViewById(R.id.txt_decrease); txtNum = findViewById(R.id.txt_num); txtNum.setText("1"); txtAdd.setOnClickListener(this); txtDecrease.setOnClickListener(this); } public void setNum(int num) { this.num = num; txtNum.setText(num + ""); } public int getNum() { return num; } @Override public void onClick(View v) { switch (v.getId()) { case R.id.txt_add: num++; txtNum.setText(num + ""); if (listener != null) { listener.add(num); } break; case R.id.txt_decrease: if (num > 1) { num--; } txtNum.setText(num + ""); if (listener != null) { listener.decrease(num); } break; } } }
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MainActvity页面：
public class MainActivity extends AppCompatActivity implements IView {
private static final String TAG = "MainActivity";
// MessageBean>>>
private TextView txtEditFinish;
private CheckBox cbTotal;
private TextView txtPrice;
private Button btnCalu;
private RecyclerView rvShoper;
private CartPresenter presenter;
private ShopperAdapter adapter;
private List>> list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
setListener();
}
private void setListener() {
cbTotal.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
boolean isChecked = cbTotal.isChecked();
// 遍历一级列表，和下方的全选状态一致
for (Shopper> listShopper : list) {
listShopper.setChecked(isChecked);
// 遍历二级列表，和下方的全选状态一致
List products = listShopper.getList();
for (Product product : products) {
product.setChecked(isChecked);
}
}
calculatePrice();
adapter.notifyDataSetChanged();
}
});
}
private void initData() {
list = new ArrayList<>();
// 商家的列表
adapter = new ShopperAdapter(this, list);
// 添加一级条目（商家）状态发生变化时
adapter.setOnShopperClickListener(new ShopperAdapter.OnShopperClickListener() {
@Override
public void onShopperClick(int position, boolean isCheck) {
// 为了效率考虑，当点击状态变成未选中时，全选按钮肯定就不是全选了，就不用再循环一次
if (!isCheck) {
cbTotal.setChecked(false);
} else {
// 如果是商家变成选中状态时，需要循环遍历所有的商家是否被选中
// 循环遍历之前先设置一个true标志位，只要有一个是未选中就改变这个标志位为false
boolean isAllShopperChecked = true;
for (Shopper> listShopper : list) {
// 只要有一个商家没有被选中，全选复选框就变成未选中状态，并且结束循环
if (!listShopper.isChecked()) {
isAllShopperChecked = false;
break;
}
}
cbTotal.setChecked(isAllShopperChecked);
}
// 一级条目发生变化时，计算一下总价
calculatePrice();
}
});
adapter.setOnAddDecreaseProductListener(new ProductAdapter.OnAddDecreaseProductListener() {
@Override
public void onChange(int position, int num) {
calculatePrice();
}
});
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
rvShoper.setLayoutManager(layoutManager);
rvShoper.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
rvShoper.setAdapter(adapter);
presenter = new CartPresenter();
presenter.attach(this);
presenter.getData();
}
// 计算商品总价
private void calculatePrice() {
// 遍历商家
float totalPrice = 0;
for (Shopper> listShopper : list) {
// 遍历商家的商品
List list = listShopper.getList();
for (Product product : list) {
// 如果商品被选中
if (product.isChecked()) {
totalPrice += product.getNum() * product.getPrice();
}
}
}
txtPrice.setText("总价：" + totalPrice);
}
private void initView() {
txtEditFinish = findViewById(R.id.txt_edit_or_finish);
cbTotal = findViewById(R.id.cb_total_select);
txtPrice = findViewById(R.id.txt_total_price);
btnCalu = findViewById(R.id.btn_calu);
rvShoper = findViewById(R.id.rv_shopper);
}
@Override
public void success(MessageBean>>> data) {
if (data != null) {
// 获取商家列表
List>> shoppers = data.getData();
if (shoppers != null) {
list.clear();
list.addAll(shoppers);
adapter.notifyDataSetChanged();
}
}
}
@Override
public void failed(Exception e) {
Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
}
@Override
protected void onDestroy() {
super.onDestroy();
if (presenter != null) {
presenter.detach();
}
}
}