Android 菜商品列表展示
如上图所示
右边也是一个数据列表，但它里面包含图片、文本框等等，并且每列都会有与之对应的餐类。
Android 部分
获取右侧商品listview的控件
private ListView rightListView = (ListView) view.findViewById(R.id.menu_lvmenu);通过Http请求服务器，设置方法名参数到后台查询成功后返回json字符串，JSONObject获取json对象data，再通过gson1.fromJson获取数据到mGoodsList集合中，再执行initData（）方法，初始化数据。initData方法中配置了ListView的适配器，主要是显示列表数据。
String urlgoodsAll=ServiceUrls.getMenuItemsMethodUrl("selectGoodsAll")+ "?catalog_food_id=" + 0;
OkHttpTool.httpPost(urlgoodsAll, null, new OkHttpTool.ResponseCallback() {
@Override
public void onResponse(boolean isSuccess, int responseCode, String response, Exception exception) {
mActivityContext.runOnUiThread(new Runnable() {
@Override
public void run() {
String strText = "网络环境不佳，请稍后再试";
if (isSuccess && responseCode == 200 && Tools.isNotNull(response)) {
try {
JSONObject jsonObject = new JSONObject(response);
String strData = jsonObject.getString("data");
JSONArray jsonArray=new JSONArray(strData);
Gson gson1=new Gson();
mGoodsList= gson1.fromJson(strData, new TypeToken>() {}.getType());
initData();
} catch (JSONException e) {
e.printStackTrace();
}
}
}
});
}
});
private void initData() {
rightAdapter = new RightAdapter(mActivityContext,mGoodsList);
//setAdapter 适配器就是用来显示列表项
rightListView.setAdapter(rightAdapter);
}
RightAdapter适配器实现SectionIndexer接口， getCount获取list集合中的条目个数，getItem根据索引获取对应的内容，getItemId获取索引，getView获取当前条目需要展示的布局效果，viewProductHolder通过容器来存储，优化找控件的内存，判断如果没有可复用那就获取控件绑定到view上，最后对控件的数据进行设置，再通过发送请求到后端查询每一列的图片。
class RightAdapter extends BaseAdapter implements SectionIndexer {
private List list = null;
private Context mContext;
public RightAdapter(Context mContext, List mGoodsList) {
this.mContext = mContext;
this.list = mGoodsList;
}
@Override
public int getCount() {
return this.list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewProductHolder viewProductHolder;
final GoodsBean mGoods = list.get(position);
if (convertView == null) {
convertView = LayoutInflater.from(mContext).inflate(R.layout.product_item, null);
TextView tvTag = (TextView) convertView.findViewById(R.id.cate_name);
TextView tvTitle = (TextView) convertView.findViewById(R.id.product_name_view);
ImageView productImage = (ImageView) convertView.findViewById(R.id.product_imageView);
TextView countView = (TextView) convertView.findViewById(R.id.add_count_view);
TextView tvPrice = (TextView) convertView.findViewById(R.id.product_price_view);
ImageView removeProductImage = (ImageView) convertView.findViewById(R.id.delete_product_view);
ImageView addProductImage = (ImageView) convertView.findViewById(R.id.add_product_view);
viewProductHolder = new ViewProductHolder(tvTag,tvTitle,productImage, countView,tvPrice, removeProductImage, addProductImage);
convertView.setTag(viewProductHolder);
} else {
viewProductHolder = (ViewProductHolder) convertView.getTag();
}
//如果有该类型，则隐藏
int section = getSectionForPosition(position);
if (position == getPositionForSection(section)) {
viewProductHolder.tvTag.setVisibility(View.VISIBLE);
viewProductHolder.tvTag.setText(mGoods.getCatalogFoodname());
} else {
viewProductHolder.tvTag.setVisibility(View.GONE);
}
viewProductHolder.tvTitle.setText(mGoods.getGoodsName());
viewProductHolder.tvPrice.setText("￥" + mGoods.getGoodsPrice());
int salecount = UIHelper.saleCount(getActivity(), mGoods.getGoodsId(),businessId);
if (salecount > 0) {
viewProductHolder.countView.setText(salecount + "");
viewProductHolder.countView.setVisibility(View.VISIBLE);
viewProductHolder.removeProductImage.setVisibility(View.VISIBLE);
} else {
viewProductHolder.countView.setText(0 + "");
viewProductHolder.countView.setVisibility(View.GONE);
viewProductHolder.removeProductImage.setVisibility(View.GONE);
}
/**
* 查询获取商品的图片
* 请求
*/
List photo= Collections.singletonList(mGoods.getGoodsPicture());
for (int i=0;i SSM 后端部分
通过@ RequestMapping注解将 HTTP 请求映射到 MVC 和 REST 控制器的处理方法上。 方法传入参数商品种类的id,根据种类id查询这个类下面有那几个商品，最后放到List集合中，json返回数据。在这是有两种情况，一种是全部查询，另一种是条件查询。
@ResponseBody
@RequestMapping(value = "/selectGoodsAll", produces = "application/json;charset=UTF-8")
public Object selectGoodsAll(int catalog_food_id) {
JsonReturn jsonReturn = new JsonReturn();
if(catalog_food_id>0) {
List listGoodsAll = this.appMenuItemsService.selectlistGoodsByKind(catalog_food_id);
if(listGoodsAll!=null) {
jsonReturn.setCode(200);
jsonReturn.setData(listGoodsAll);
}else {
jsonReturn.setCode(500);
jsonReturn.setText("商品加载失败");
}
}else {
List listGoodsByKind=this.appMenuItemsService.selectlistGoodsAll();
if(listGoodsByKind!=null) {
jsonReturn.setCode(200);
jsonReturn.setData(listGoodsByKind);
}else {
jsonReturn.setCode(500);
jsonReturn.setText("商品加载失败");
}
}
return gson.toJson(jsonReturn);
}
获取商品图片，判断参数是否为空，设置照片所在的本地路径（定义一行AppSeting类public static final String UPLOAD_GOODS_TYPE_PIC_DIR = "D:\\课程\\安卓移动开发\\点餐吧\\商品图片"；），再判断你所对应的路径文件是否存在，设置Header，设置为图片类型
通过Android传过来的图片名称，到文件中查询出来再返回。
@RequestMapping(value="/getGoodsPicture")
public ResponseEntity getGoodsPicture(String pictureName) throws IOException {
// 判断是否为空
if (Tools.isNotNull(pictureName)) {
// 文件 照片的路经 ，名称
File file = new File(AppSeting.UPLOAD_GOODS_TYPE_PIC_DIR, pictureName);
// 判断文件是否存在
if (file.exists()) {
// 设置Header
HttpHeaders headers = new HttpHeaders();
// 设置为图片类型
headers.setContentType(MediaType.IMAGE_JPEG);
headers.setContentDispositionFormData("attachment", pictureName);
// 返回文件相关数据
return new ResponseEntity(FileUtils.readFileToByteArray(file), headers, HttpStatus.CREATED);
}
}
return null;
}