17 Flutter仿京东商城项目保存历史搜索记录删除历史记录清空历史记录长按删除...

傷城~ 2023-08-17 15:58 156阅读 0赞

Storage.dart

import 'package:shared_preferences/shared_preferences.dart';
    class Storage{
      static Future<void> setString(key,value) async{
        SharedPreferences sp=await SharedPreferences.getInstance();
        sp.setString(key, value);
      }
    
      static Future<String> getString(key) async{
        SharedPreferences sp=await SharedPreferences.getInstance();
        return sp.getString(key);
      }
      
      static Future<String> remove(key) async{
        SharedPreferences sp=await SharedPreferences.getInstance();
        sp.remove(key);
      }
    
        static Future<String> clear(key) async{
        SharedPreferences sp=await SharedPreferences.getInstance();
        sp.clear();
      }
    }

SearchServices.dart

import 'dart:convert';
    import 'Storage.dart';
    
    class SearchServices {
      static setHistoryData(keywords) async {
        /**
         * 1.获取本地存储里面的数据。(searchList)
         * 2.判断本地存储是否有数据
         * 2.1如果有数据：
         *  1.读取本地存储的数据。
         * 2.判断本地存储中有没有当前数据；
         * 3.如果有不做操作
         * 如果没有当前数据，本地存储的数据和当前数据拼接后重新写入。
         * 2.2如果没有数据：
         * 直接把当前数据放在数组中写入到本地存储。
         * 
         * 
         *  */
        try {
          List searchListData = json.decode(await Storage.getString('searchList'));
          // print(searchListData);
          var hasData = searchListData.any((v) {
            return v == keywords;
          });
          if (!hasData) {
            searchListData.add(keywords);
            await Storage.setString('searchList', json.encode(searchListData));
          }
        } catch (e) {
          List tempList = new List();
          tempList.add(keywords);
          await Storage.setString('searchList', json.encode(tempList));
        }
      }
    
      static getHistoryList() async {
        try {
          List searchListData = json.decode(await Storage.getString('searchList'));
          return searchListData;
        } catch (e) {
          return [];
        }
      }
    
      static removeHistoryList() async {
        await Storage.remove('searchList');
      }
    }

Search.dart

import 'package:flutter/material.dart';
    import 'package:flutter_jdshop/services/ScreenAdaper.dart';
    import 'package:flutter_jdshop/services/SearchServices.dart';
    
    class SearchPage extends StatefulWidget {
      SearchPage({Key key}) : super(key: key);
    
      _SearchPageState createState() => _SearchPageState();
    }
    
    class _SearchPageState extends State<SearchPage> {
      var _keywords;
      List _historyListData = [];
      @override
      void initState() {
        super.initState();
        this._historyListWidget();
      }
    
      _getHistoryData() async {
        var _historyListData = await SearchServices.getHistoryList();
        setState(() {
         this._historyListData=_historyListData; 
        });
      }
    
      Widget _historyListWidget() {
        if (_historyListData.length > 0) {
          return Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              Container(
                child: Text('历史记录', style: Theme.of(context).textTheme.title),
              ),
              Divider(),
              Column(
                children: this._historyListData.map((value) {
                  return Column(
                    children: <Widget>[
                      ListTile(
                        title: Text('${value}'),
                      ),
                      Divider()
                    ],
                  );
                }).toList(),
              ),
              SizedBox(height: 100),
              Row(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  InkWell(
                    onTap: () {
                      SearchServices.removeHistoryList();
                      this._getHistoryData();
                    },
                    child: Container(
                      width: ScreenAdaper.width(400),
                      height: ScreenAdaper.height(64),
                      decoration: BoxDecoration(
                          border: Border.all(color: Colors.black54, width: 1)),
                      child: Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: <Widget>[Icon(Icons.delete), Text('清空历史记录')],
                      ),
                    ),
                  )
                ],
              )
            ],
          );
        } else {
          return Text('');
        }
      }
    
      @override
      Widget build(BuildContext context) {
        return Scaffold(
            appBar: AppBar(
              title: Container(
                child: TextField(
                  autofocus: true,
                  decoration: InputDecoration(
                      border: OutlineInputBorder(
                          borderRadius: BorderRadius.circular(30),
                          borderSide: BorderSide.none)),
                  onChanged: (value) {
                    this._keywords = value;
                  },
                ),
                height: ScreenAdaper.height(68),
                decoration: BoxDecoration(
                    color: Color.fromRGBO(233, 233, 233, 0.8),
                    borderRadius: BorderRadius.circular(30)),
              ),
              actions: <Widget>[
                InkWell(
                  child: Container(
                    height: ScreenAdaper.height(68),
                    width: ScreenAdaper.width(80),
                    child: Row(
                      children: <Widget>[Text('搜索')],
                    ),
                  ),
                  onTap: () {
                    SearchServices.setHistoryData(this._keywords);
                    Navigator.pushReplacementNamed(context, '/productList',
                        arguments: {
         "keywords": this._keywords});
                  },
                )
              ],
            ),
            body: Container(
              padding: EdgeInsets.all(10),
              child: ListView(
                children: <Widget>[
                  Container(
                    child: Text('热搜', style: Theme.of(context).textTheme.title),
                  ),
                  Divider(),
                  Wrap(
                    children: <Widget>[
                      Container(
                        padding: EdgeInsets.all(10),
                        margin: EdgeInsets.all(10),
                        decoration: BoxDecoration(
                            color: Color.fromRGBO(233, 233, 233, 0.9),
                            borderRadius: BorderRadius.circular(10)),
                        child: Text('女装'),
                      ),
                      Container(
                        padding: EdgeInsets.all(10),
                        margin: EdgeInsets.all(10),
                        decoration: BoxDecoration(
                            color: Color.fromRGBO(233, 233, 233, 0.9),
                            borderRadius: BorderRadius.circular(10)),
                        child: Text('女装'),
                      ),
                      Container(
                        padding: EdgeInsets.all(10),
                        margin: EdgeInsets.all(10),
                        decoration: BoxDecoration(
                            color: Color.fromRGBO(233, 233, 233, 0.9),
                            borderRadius: BorderRadius.circular(10)),
                        child: Text('女装'),
                      ),
                      Container(
                        padding: EdgeInsets.all(10),
                        margin: EdgeInsets.all(10),
                        decoration: BoxDecoration(
                            color: Color.fromRGBO(233, 233, 233, 0.9),
                            borderRadius: BorderRadius.circular(10)),
                        child: Text('女装'),
                      ),
                      Container(
                        padding: EdgeInsets.all(10),
                        margin: EdgeInsets.all(10),
                        decoration: BoxDecoration(
                            color: Color.fromRGBO(233, 233, 233, 0.9),
                            borderRadius: BorderRadius.circular(10)),
                        child: Text('女装'),
                      )
                    ],
                  ),
                  SizedBox(height: 10),
                  //历史记录：
                  _historyListWidget()
                ],
              ),
            ));
      }
    }

Home.dart

import 'package:flutter/material.dart';
    import '../../services/SearchServices.dart';
    
    
    //热门推荐：
    import '../../model/ProductModel.dart';
    import 'package:flutter_swiper/flutter_swiper.dart';
    // import 'dart:convert';
    import '../../services/ScreenAdaper.dart';
    import '../../config/Config.dart';
    import 'package:dio/dio.dart';
    //轮播图类模型：
    import '../../model/FocusModel.dart';
    
    
    
    class HomePage extends StatefulWidget {
      HomePage({Key key}) : super(key: key);
    
      _HomePageState createState() => _HomePageState();
    }
    
    class _HomePageState extends State<HomePage> with AutomaticKeepAliveClientMixin {
      //轮播图：
      //flutter run -d all 链接多个设备的命令：
      List _focusData = [];
      List _hotProductList=[];
      List _bestProductList=[];
        @override
      // TODO: implement wantKeepAlive
      bool get wantKeepAlive => true;
      void initState() {
        super.initState();
        _getFocusData();
        _getHotProductData();
        _getBestProductData();
    
        SearchServices.setHistoryData('aaa');
      }
      //获取轮播图数据：
      _getFocusData() async {
        var api = '${Config.domain}api/focus';
        var result = await Dio().get(api);
        var focusList = FocusModel.fromJson(result.data);
        focusList.result.forEach((value) {
          print(value.title);
          print(value.pic);
        });
        setState(() {
          this._focusData = focusList.result;
        });
      }
      //获取猜你喜欢的数据：
      _getHotProductData() async{
        var api='${Config.domain}api/plist?is_hot=1';
        var result=await Dio().get(api);
        var hotProductList=ProductModel.fromJson(result.data);
        setState(() {
         this._hotProductList= hotProductList.result;
        });
      }
      //获取热门推荐的数据：
      _getBestProductData() async{
        var api='${Config.domain}api/plist?is_best=1';
        var result=await Dio().get(api);
        var bestProductList=ProductModel.fromJson(result.data);
        setState(() {
         this._bestProductList= bestProductList.result;
        });
      }
    
      Widget _swiperWidget() {
        // List<Map> imgList = [
        //   {"url": "https://www.itying.com/images/flutter/slide01.jpg"},
        //   {"url": "https://www.itying.com/images/flutter/slide02.jpg"},
        //   {"url": "https://www.itying.com/images/flutter/slide03.jpg"}
        // ];
        if (this._focusData.length > 0) {
          return Container(
            child: AspectRatio(
              aspectRatio: 2 / 1,
              child: Swiper(
                itemBuilder: (BuildContext context, int index) {
                  String pic=this._focusData[index].pic;
                  pic=Config.domain+pic.replaceAll('\\', '/');
                  return new Image.network(
                    "${pic}",
                    fit: BoxFit.fill,
                  );
                },
                itemCount: this._focusData.length,
                pagination: new SwiperPagination(),
                control: new SwiperControl(),
                autoplay: true,
              ),
            ),
          );
        } else {
          return Text('加载中~');
        }
      }
    
      //标题：
      Widget _titleWidget(value) {
        return Container(
          height: ScreenAdaper.height(46),
          margin: EdgeInsets.only(left: ScreenAdaper.width(20)),
          padding: EdgeInsets.only(left: ScreenAdaper.width(20)),
          decoration: BoxDecoration(
              border: Border(
                  left: BorderSide(
                      color: Colors.red, width: ScreenAdaper.width(10)))),
          child: Text(value, style: TextStyle(color: Colors.black54)),
        );
      }
    
      //热门商品：
      Widget _hotProductListWidget() {
        if(this._hotProductList.length>0){
        return Container(
          height: ScreenAdaper.height(240),
          padding: EdgeInsets.all(ScreenAdaper.width(20)),
          // width: double.infinity, //寬度自適應
          child: ListView.builder(
            scrollDirection: Axis.horizontal,
            itemBuilder: (contxt, index) {
    
              String sPic=this._hotProductList[index].sPic;
              sPic=Config.domain+sPic.replaceAll('\\', '/');
              return Column(
                children: <Widget>[
                  Container(
                    height: ScreenAdaper.height(140),
                    width: ScreenAdaper.width(140),
                    margin: EdgeInsets.only(right: ScreenAdaper.width(21)),
                    child: Image.network(
                       "${sPic}",
                      fit: BoxFit.cover),
                  ),
                  Container(
                    padding: EdgeInsets.only(top: ScreenAdaper.height(10)),
                    height: ScreenAdaper.height(44),
                    child: Text(
                      "￥${this._hotProductList[index].price}",
                      style: TextStyle(color: Colors.red),
                      ),
                  )
                ],
              );
            },
            itemCount: this._hotProductList.length,
          ),
        );
      
        }else{
          return Text('暂无热门推荐数据');
        }
    
      }
    
      Widget _recProductListWidget() {
    
    
        var itemWidth = (ScreenAdaper.getScreenWidth() - 30) / 2;
        return         Container(
              padding: EdgeInsets.all(10),
              child: Wrap(
                runSpacing: 10,
                spacing: 10,
                children:this._bestProductList.map((value){
                  //图片：
                  var sPic=value.sPic;
                  sPic=Config.domain+sPic.replaceAll('\\','/');
    
        return Container(
          padding: EdgeInsets.all(ScreenAdaper.width(20)),
          width: itemWidth,
          decoration:
          BoxDecoration(border: Border.all(color: Colors.black12, width: 1)),
          child: Column(
            children: <Widget>[
              Container(
                width: double.infinity,
                child: AspectRatio(
                  aspectRatio: 1 / 1,
                  child: Image.network(
                      "${sPic}",
                      fit: BoxFit.cover),
                ),
              ),
              Padding(
                padding: EdgeInsets.only(top: ScreenAdaper.height(10)),
                child: Text(
                  "${value.title}",
                  maxLines: 2,
                  overflow: TextOverflow.ellipsis,
                  style: TextStyle(color: Colors.black54),
                ),
              ),
              Padding(
                padding: EdgeInsets.only(top: ScreenAdaper.height(20)),
                child: Stack(
                  children: <Widget>[
                    Align(
                      alignment: Alignment.centerLeft,
                      child: Text(
                        "${value.price}",
                        style: TextStyle(color: Colors.red, fontSize: 16),
                      ),
                    ),
                    Align(
                      alignment: Alignment.centerRight,
                      child: Text(
                        "￥${value.oldPrice}",
                        style: TextStyle(
                            color: Colors.black54,
                            fontSize: 16,
                            decoration: TextDecoration.lineThrough),
                      ),
                    )
                  ],
                ),
              )
            ],
          ),
        );
     
    
    
    
                }).toList(),
              ),
            );
    
    
    
      }
    
      @override
      Widget build(BuildContext context) {
        ScreenAdaper.init(context);
        return ListView(
          children: <Widget>[
            _swiperWidget(),
            SizedBox(height: ScreenAdaper.height(20)),
            _titleWidget("猜你喜欢"),
            _hotProductListWidget(),
            SizedBox(height: ScreenAdaper.height(20)),
            _titleWidget("热门推荐"),
            _recProductListWidget()
          ],
        );
      }
    }

转载于:https://www.cnblogs.com/yiweiyihang/p/11450848.html