电商项目中常常有购物车这个功能，做个很多项目了，都有不同的界面，选了一个来讲一下。
RecyclerView 模仿淘宝购物车功能(删除选择商品，商品计算，选择， 全选反选，商品数量加减等)
看看效果图：
Activity代码：
/*****
* RecyclerView 模仿淘宝购物车功能
*
* 删除选择商品，商品计算，选择，全选反选，商品数量加减等
*
*/
public class MainActivity extends AppCompatActivity { private RecyclerView rvNestDemo;
private CartAdapter cartAdapter;
CartInfo cartInfo;
double price;
int num; TextView cartNum;
TextView cartMoney;
Button cartShoppMoular;
CheckBox checkBox; private TextView btnDelete; @Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rvNestDemo = (RecyclerView) findViewById(R.id.rv_nest_demo);
cartNum = findViewById(R.id.cart_num);
cartMoney = findViewById(R.id.cart_money);
cartShoppMoular = findViewById(R.id.cart_shopp_moular);
cartShoppMoular.setOnClickListener(new OnClickListener());
checkBox = findViewById(R.id.cbx_quanx_check);
checkBox.setOnClickListener(new OnClickListener());
btnDelete = (TextView) findViewById(R.id.btn_delete);
initView();
} private void initView() {
btnDelete.setOnClickListener(new OnClickListener());
showData();
rvNestDemo.setLayoutManager(new LinearLayoutManager(this));
DividerItemDecoration itemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL);
itemDecoration.setDrawable(ContextCompat.getDrawable(this, R.drawable.line_divider_inset));
rvNestDemo.addItemDecoration(itemDecoration);
cartAdapter = new CartAdapter(this, cartInfo.getData());
rvNestDemo.setAdapter(cartAdapter);
showExpandData(); } private void showExpandData() {
/**
* 全选
*/
cartAdapter.setOnItemClickListener(new OnViewItemClickListener() {
@Override
public void onItemClick(boolean isFlang, View view, int position) {
cartInfo.getData().get(position).setIscheck(isFlang);
int length = cartInfo.getData().get(position).getItems().size();
for (int i = 0; i < length; i++) {
cartInfo.getData().get(position).getItems().get(i).setIscheck(isFlang);
}
cartAdapter.notifyDataSetChanged();
showCommodityCalculation();
}
}); /**
* 计算价钱
*/
cartAdapter.setOnItemMoneyClickListener(new OnItemMoneyClickListener() {
@Override
public void onItemClick(View view, int position) {
showCommodityCalculation();
} });
} /***
* 计算商品的数量和价格
*/
private void showCommodityCalculation() {
price = 0;
num = 0;
for (int i = 0; i < cartInfo.getData().size(); i++) {
for (int j = 0; j < cartInfo.getData().get(i).getItems().size(); j++) {
if (cartInfo.getData().get(i).getItems().get(j).ischeck()) {
price += Double.valueOf((cartInfo.getData().get(i).getItems().get(j).getNum() * Double.valueOf(cartInfo.getData().get(i).getItems().get(j).getPrice())));
num++;
} else {
checkBox.setChecked(false);
}
}
}
if (price == 0.0) {
cartNum.setText("共0件商品");
cartMoney.setText("¥ 0.0");
return;
}
try {
String money = String.valueOf(price);
cartNum.setText("共" + num + "件商品");
if (money.substring(money.indexOf("."), money.length()).length() > 2) {
cartMoney.setText("¥ " + money.substring(0, (money.indexOf(".") + 3)));
return;
}
cartMoney.setText("¥ " + money.substring(0, (money.indexOf(".") + 2)));
} catch (Exception e) {
e.printStackTrace();
}
} private void showData() {
cartInfo = JSON.parseObject(JSONDATA(), CartInfo.class);
} private class OnClickListener implements View.OnClickListener {
@Override
public void onClick(View v) {
switch (v.getId()) { //全选和不全选
case R.id.cbx_quanx_check:
if (checkBox.isChecked()) {
int length = cartInfo.getData().size();
for (int i = 0; i < length; i++) {
cartInfo.getData().get(i).setIscheck(true);
int lengthn = cartInfo.getData().get(i).getItems().size();
for (int j = 0; j < lengthn; j++) {
cartInfo.getData().get(i).getItems().get(j).setIscheck(true);
}
} } else {
int length = cartInfo.getData().size();
for (int i = 0; i < length; i++) {
cartInfo.getData().get(i).setIscheck(false);
int lengthn = cartInfo.getData().get(i).getItems().size();
for (int j = 0; j < lengthn; j++) {
cartInfo.getData().get(i).getItems().get(j).setIscheck(false);
}
}
}
cartAdapter.notifyDataSetChanged();
showCommodityCalculation();
break;
case R.id.btn_delete:
//删除选中商品
cartAdapter.removeChecked();
showCommodityCalculation();
break;
case R.id.cart_shopp_moular:
Toast.makeText(MainActivity.this,"提交订单: "+cartMoney.getText().toString()+"元",Toast.LENGTH_LONG).show();
break;
}
}
}
这是我写的第二个购物车，基本的功能都有了的。
有需要的小伙们，可以参考一下。