# 基础使用
请看这篇文章
[基础使用教程](http://blog.csdn.net/yanbober/article/details/45307549)
# 点餐APP中的用法：
第一步，初始化
` final AsyncHttpClient client = new AsyncHttpClient();`
第二步发送get请求
~~~
client.get(Constants.server_url + Constants.buyer_list_url, null, new AsyncHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
AppLog.debug(new String(responseBody));
Gson gson = new Gson();
ProductVO productVO = gson.fromJson(new String(responseBody), ProductVO.class);
AppLog.debug(productVO.getData().get(0).getFoods().get(0).getName());
//一个data就是一种商品类型
List<ProductVO.DataBean> dataBeanList = productVO.getData();
//组装商品类型 categorylist
List<String> categoryName = new ArrayList<>();
//组装商品productlist
final List<ProductItem> productItemList = new ArrayList<>();
final List<Integer> typesList = new ArrayList<>();
int flag = 0;
for (ProductVO.DataBean dataBean : dataBeanList) {
String categoryNameTMP = dataBean.getName();
AppLog.debug(categoryNameTMP);
//组装类型名称
categoryName.add(categoryNameTMP);
//获得商品列表
List<ProductVO.DataBean.FoodsBean> foods = dataBean.getFoods();
flag += foods.size();
typesList.add(flag);//每个商品类型有几个商品，第0个类型有 foods.zie个商品
for (ProductVO.DataBean.FoodsBean foodsBean : foods) {
ProductItem productItem = new ProductItem();
productItem.setProductId(foodsBean.getId());
productItem.setImgUrl(foodsBean.getIcon());
productItem.setProductName(foodsBean.getName());
productItem.setProductDes(foodsBean.getDescription());
productItem.setProductPrice(foodsBean.getPrice());
//添加商品列表
productItemList.add(productItem);
}
}
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext(),
LinearLayoutManager.VERTICAL, false);
RecyclerView.LayoutManager layoutManager1 = new LinearLayoutManager(getApplicationContext(),
LinearLayoutManager.VERTICAL, false);
rvProduct.setLayoutManager(layoutManager);
ivProductCategory.setLayoutManager(layoutManager1);
BaseQuickAdapter<String, BaseViewHolder> categoryAdapter = new HomeAdapterCategory(R.layout.product_category_item, categoryName);
final BaseQuickAdapter<ProductItem, BaseViewHolder> infoProductAdapter = new HomeAdapter(R.layout.product_info_item, productItemList);
//商品类型添加事件
categoryAdapter.setOnItemClickListener(new BaseQuickAdapter.OnItemClickListener() {
@Override
public void onItemClick(BaseQuickAdapter adapter, View view, int position) {
//position对应商品类型
int foodsposition = typesList.get(position);
AppLog.debug(foodsposition);
rvProduct.scrollToPosition(foodsposition);
}
});
infoProductAdapter.setOnItemChildClickListener(new BaseQuickAdapter.OnItemChildClickListener() {
@Override
public void onItemChildClick(BaseQuickAdapter adapter, View view, final int position) {
List<ProductItem> productItems = cartForm.getList();
if (view.getId() == R.id.btn_add_product_to_cart) {
Integer amout = productItemList.get(position).getAmout();
productItemList.get(position).setAmout(amout + 1);
AppLog.debug(amout + 1);
ProductItem productItem = productItemList.get(position);
productItems.add(productItem);
} else if (view.getId() == R.id.btn_de_product_to_cart) {
Integer amout = productItemList.get(position).getAmout();
if (amout > 0) {
productItemList.get(position).setAmout(amout - 1);
ProductItem productItem = productItemList.get(position);
productItems.add(productItem);
}
AppLog.debug(amout - 1);
}
int sumCount = 0;
int sumPrice = 0;
for (ProductItem productItem : productItemList) {
sumCount += productItem.getAmout();
if (productItem.getAmout() >= 1) {
sumPrice += productItem
.getProductPrice() * productItem.getAmout();
}
}
cartForm.setList(productItems);
rvProduct.setAdapter(infoProductAdapter);
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("总共").append(sumCount).append("件商品").append("共计").append(sumPrice).append("元");
tvShowCart.setText(stringBuilder);
}
});
rvProduct.setAdapter(infoProductAdapter);
ivProductCategory.setAdapter(categoryAdapter);
}
@Override
public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
}
});
~~~
