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

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(
                   ScreenAdaper.width(400),
                  height: ScreenAdaper.height(64),
                  decoration: BoxDecoration(
                      border: Border.all(color: Colors.black54,  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),
                 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,  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)),
      //  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),
                 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)),
       itemWidth,
      decoration:
      BoxDecoration(border: Border.all(color: Colors.black12,  1)),
      child: Column(
        children: <Widget>[
          Container(
             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()
      ],
    );
  }
}