19 Flutter仿京东商城项目 商品详情 底部浮动导航布局 商品页面布局

效果：

widget/JdButton.dart

import 'package:flutter/material.dart';
import '../services/ScreenAdaper.dart';

class JdButton extends StatelessWidget {

  final Color color;
  final String text;
  final Object cb;
  JdButton({Key key,this.color=Colors.black,this.text='按钮',this.cb=null}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return InkWell(
      onTap:this.cb,
      child: Container(
        margin: EdgeInsets.all(5),
        padding: EdgeInsets.all(5),
        height: ScreenAdaper.height(68),
         double.infinity,
        decoration: BoxDecoration(
            color: color,
            borderRadius: BorderRadius.circular(10)),
        child: Center(
          child: Text(text, style: TextStyle(color: Colors.white)),
        ),
      ),
    );
  }
}

pages/ProductContent.dart

import 'package:flutter/material.dart';
import '../services/ScreenAdaper.dart';
import 'ProductContent/ProductContentFirst.dart';
import 'ProductContent/ProductContentSecond.dart';
import 'ProductContent/ProductContentThird.dart';
import '../widget/JdButton.dart';
class ProductContentPage extends StatefulWidget {
  final Map arguments;
  ProductContentPage({Key key, this.arguments}) : super(key: key);

  _ProductContentPageState createState() => _ProductContentPageState();
}

class _ProductContentPageState extends State<ProductContentPage> {
  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      length: 3,
      child: Scaffold(
        appBar: AppBar(
          title: Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Container(
                 ScreenAdaper.width(400),
                child: TabBar(
                  indicatorColor: Colors.red,
                  indicatorSize: TabBarIndicatorSize.label,
                  tabs: <Widget>[
                    Tab(
                      child: Text('商品'),
                    ),
                    Tab(
                      child: Text('详情'),
                    ),
                    Tab(
                      child: Text('评价'),
                    )
                  ],
                ),
              )
            ],
          ),
          actions: <Widget>[
            IconButton(
              icon: Icon(Icons.more_horiz),
              onPressed: () {
                showMenu(
                    context: context,
                    position: RelativeRect.fromLTRB(
                        ScreenAdaper.width(600), 76, 10, 0),
                    items: [
                      PopupMenuItem(
                        child: Row(
                          children: <Widget>[Icon(Icons.home), Text('首页')],
                        ),
                      ),
                      PopupMenuItem(
                        child: Row(
                          children: <Widget>[Icon(Icons.search), Text('搜索')],
                        ),
                      ),
                    ]);
              },
            )
          ],
        ),
        body: Stack(
          children: <Widget>[
            TabBarView(
              children: <Widget>[
                ProductContentFirst(),
                ProductContentSecond(),
                ProductContentThird()
              ],
            ),
            Positioned(
               ScreenAdaper.width(750),
              height: ScreenAdaper.height(110),
              bottom: 0,
              child: Container(
                decoration: BoxDecoration(
                    border: Border(
                        top: BorderSide(color: Colors.black54,  1)),
                    color: Colors.white),
                child: Row(
                  children: <Widget>[
                    Container(
                      padding: EdgeInsets.only(top: ScreenAdaper.height(10)),
                       100,
                      height: ScreenAdaper.height(88),
                      child: Column(
                        children: <Widget>[
                          Icon(
                            Icons.shopping_cart,
                            size: 15,
                          ),
                          Text('购物车')
                        ],
                      ),
                    ),
                    Expanded(
                      flex: 1,
                      child: JdButton(
                        color: Color.fromRGBO(253, 1, 0, 0.9),
                        text: "加入购物车",
                        cb: (){
                          print('加入购物车');
                        },
                      ),
                    ),
                    Expanded(
                      flex: 1,
                      child: JdButton(
                        color: Color.fromRGBO(255, 165, 0, 0.9),
                        text: "立即购物",
                        cb: (){
                          print('立即购物');
                        },
                      ),
                    )
                  ],
                ),
              ),
            )
          ],
        ),
      ),
    );
  }
}

pages/ProductContent/ProductContentFirst.dart

import 'package:flutter/material.dart';
import '../../services/ScreenAdaper.dart';
class ProductContentFirst extends StatefulWidget {
  ProductContentFirst({Key key}) : super(key: key);

  _ProductContentFirstState createState() => _ProductContentFirstState();
}

class _ProductContentFirstState extends State<ProductContentFirst> {
  @override
  Widget build(BuildContext context) {
    return Container(
      padding: EdgeInsets.all(10),
      child:ListView(
        children: <Widget>[
          AspectRatio(
            aspectRatio: 16/9,
            child: Image.network("https://www.itying.com/images/flutter/p1.jpg",fit: BoxFit.cover,)
          ),
          Container(
            padding: EdgeInsets.only(top: 10),
            child: Text("联想ThinkPad联想ThinkPad联想ThinkPad联想ThinkPad联想ThinkPad联想ThinkPad联想ThinkPad",style: TextStyle(
              color: Colors.black87,
              fontSize: ScreenAdaper.size(36)
            )),
          ),
          Container(
            padding: EdgeInsets.only(top: 10),
            child: Text("联想ThinkPad联想ThinkPad联想ThinkPad联想ThinkPad联想ThinkPad联想ThinkPad联想ThinkPad",style: TextStyle(
              color: Colors.black54,
              fontSize: ScreenAdaper.size(28)
            )),
          ),
          Container(
            padding: EdgeInsets.only(top:10),
            child: Row(
              children: <Widget>[
              
                Expanded(
                  flex: 1,
                  child: Row(
                    children: <Widget>[
                      Text('特价'),
                      Text('￥28',style: TextStyle(
                        color: Colors.red,
                        fontSize: ScreenAdaper.size(46)
                      ))
                    ],
                  ),
                ),
              
                Expanded(
                  flex: 1,
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.end,
                    children: <Widget>[
                      Text('原价'),
                      Text('￥50',style: TextStyle(
                        color: Colors.black38,
                        fontSize: ScreenAdaper.size(28),
                        decoration: TextDecoration.lineThrough
                      ))
                    ],
                  ),
                )
              
              ],
            ),
          ),
          //筛选：
          Container(
             margin: EdgeInsets.only(top:10),
            height: ScreenAdaper.height(80),
            child: Row(
              children: <Widget>[
                Text('已选',style: TextStyle(
                  fontWeight: FontWeight.bold
                )),
                Text('115,黑色')
              ],
            ),
          ),
          Divider(),
          Container(
            height: ScreenAdaper.height(80),
            child: Row(
              children: <Widget>[
                Text('运费',style: TextStyle(
                  fontWeight: FontWeight.bold
                )),
                Text('免运费')
              ],
            ),
          ),
          Divider()
        ],
      ) 
    );
  }
}

pages/ProductContent/ProductContentSecond.dart

import 'package:flutter/material.dart';
class ProductContentSecond extends StatefulWidget {
  ProductContentSecond({Key key}) : super(key: key);

  _ProductContentSecondState createState() => _ProductContentSecondState();
}

class _ProductContentSecondState extends State<ProductContentSecond> {
  @override
  Widget build(BuildContext context) {
    return Container(
       child: Text('商品详情'),
    );
  }
}

pages/ProductContent/ProductContentThird.dart

import 'package:flutter/material.dart';
class ProductContentThird extends StatefulWidget {
  ProductContentThird({Key key}) : super(key: key);

  _ProductContentThirdState createState() => _ProductContentThirdState();
}

class _ProductContentThirdState extends State<ProductContentThird> {
  @override
  Widget build(BuildContext context) {
    return Container(
       child: Text('商品评论'),
    );
  }
}