Flutter移动电商实战 --（36）FlutterToast插件使用

矫情吗；* 2023-06-01 06:04 46阅读 0赞

[https://github.com/PonnamKarthik/FlutterToast][https_github.com_PonnamKarthik_FlutterToast]

fluttertoast: ^3.0.1

![1090399-20190908221112078-120317832.png][]

category\_page.dart页面添加引用

import 'package:fluttertoast/fluttertoast.dart';

![1090399-20190908221155096-421835978.png][]

![1090399-20190908221222897-1069723547.png][]

# 小类跳转到全部，没有数据的问题 #

![1090399-20190908221244243-1253854726.png][]

![1090399-20190908221311916-966480148.png][]

# 本节课代码 #

provide/child\_category.dart

import 'package:flutter/material.dart';
    import '../model/category.dart';
    
    class ChildCategory with ChangeNotifier{
     List<BxMallSubDto> childCategoryList=[];
     int childIndex=0;//子类高亮索引
     String categoryId='4';//大类ID 白酒的id 默认为4
     String subId='';//小类ID
     int page=1;
     String noMoreText='';//显示没有数据的文字
      //大类切换逻辑
      getChildCategory(List<BxMallSubDto> list,String id){
        page=1;
        noMoreText='';
        childIndex=0;//每次点击大类，小类的索引都要清空掉
        categoryId=id;
        BxMallSubDto all=BxMallSubDto();
        all.mallSubId="";
        all.mallCategoryId="00";
        all.comments="null";
        all.mallSubName='全部';
        childCategoryList=[all];
        //childCategoryList=list;
        childCategoryList.addAll(list);
        notifyListeners();//监听
      }
      //改变子类索引,indexs是从哪里来的呢？从我们具体的类中进行传递
      changeChildIndex(index,String id){
        page=1;
        noMoreText='';
        childIndex=index;//把传递过来的index赋值给我们的childIndex
        subId=id;
        notifyListeners();//通知
      }
      //增加Page的方法
      addPage(){
        page++;
        //notifyListeners();//这里不需要通知，因为我们只是page+1了并没有页面数据上的变化
      }
      //改变noMore的方法
      changeNoMore(String text){
        noMoreText=text;
        notifyListeners();//通知
      }
    }

category\_page.dart主要代码

void _getMoreList() {
         Provide.value<ChildCategory>(context).addPage();
          var data={
            'categoryId':Provide.value<ChildCategory>(context).categoryId,//大类ID
            'categorySubId':Provide.value<ChildCategory>(context).subId,
            'page':Provide.value<ChildCategory>(context).page
          };
          request('getMallGoods',formData: data).then((val){
            var data=json.decode(val.toString());
            CategoryGoodsListModel goodsList=CategoryGoodsListModel.fromJson(data);//这样就从json'转换成了model类
            if(goodsList.data==null){
              Fluttertoast.showToast(
                msg:'已经到底了',
                toastLength: Toast.LENGTH_SHORT,//适应短的提示
                gravity: ToastGravity.CENTER,//中间提示
                backgroundColor: Colors.pink,
                textColor: Colors.white,
                fontSize: 16.0
              );
              Provide.value<ChildCategory>(context).changeNoMore('没有更多了');
            }else{
              Provide.value<CategoryGoodsListProvide>(context).getMoreList(goodsList.data);
            }
            
          });
        }

转载于:https://www.cnblogs.com/crazycode2/p/11462239.html

[https_github.com_PonnamKarthik_FlutterToast]: https://github.com/PonnamKarthik/FlutterToast
[1090399-20190908221112078-120317832.png]: /images/20230601/a8ae83d64dc94d0c9b496c4da5800a65.png
[1090399-20190908221155096-421835978.png]: /images/20230601/1003bedd14174aa8ab4650691b540a9f.png
[1090399-20190908221222897-1069723547.png]: /images/20230601/04feb15d1579495db8508c6f31baf4c4.png
[1090399-20190908221244243-1253854726.png]: /images/20230601/18560584893542f88248f3a0b0bae6f1.png
[1090399-20190908221311916-966480148.png]: /images/20230601/5e87b68470384473b0e45b1610f46e2a.png