Flutter---通用子项的图片个数不同（1）

效果图

实现步骤

1.构建网格通用子项

Widget _buildInAudioItem({ required String name, required List<String> images, //关键：使用列表存储图片 required VoidCallback onTap, double imageSize = 40, }){ return Column( children: [ GestureDetector( onTap: onTap, child: Container( height: 150, width: 155, decoration: BoxDecoration( color:Color(0xFF1B1D2E), borderRadius: BorderRadius.circular(10) ), child: Center( child: _buildImageLayout(images,imageSize:imageSize), //关键：传递图片和图片尺寸给显示图片的方法 ), ), ), SizedBox(height: 8), Text(name,style: TextStyle(color: Colors.white,fontSize: 12),), ], ); }

2.构建图片的布局，根据用户传递的图片个数传递不同的UI格式

Widget _buildImageLayout(List<String> images, {double imageSize = 40}) { int count = images.length; //传递的图片个数 if (count == 1) { // 单个图片居中显示 return Container( height: imageSize, width: imageSize, decoration: BoxDecoration( color: Color(0xFF55596D), borderRadius: BorderRadius.circular(imageSize / 2), ), child: Center( child: Image.asset( images[0], width: imageSize * 0.5, height: imageSize * 0.5, ), ), ); } else if (count == 2) { // 两个图片并排 return Row( mainAxisAlignment: MainAxisAlignment.center, children: [ _buildSingleImage(images[0], imageSize: imageSize), SizedBox(width: 5,), _buildSingleImage(images[1], imageSize: imageSize), ], ); } else if (count == 3) { // 三个或以上图片，显示前三个 return Row( mainAxisAlignment: MainAxisAlignment.center, children: [ _buildSingleImage(images[0], imageSize: imageSize), SizedBox(width: 5,), _buildSingleImage(images[1], imageSize: imageSize), SizedBox(width: 5,), _buildSingleImage(images[2], imageSize: imageSize), ], ); } return SizedBox.shrink(); }

3.构建单个图片的组件：用圆包裹传递过来的图片

Widget _buildSingleImage(String imagePath, {double imageSize = 40}) { return Container( height: imageSize, width: imageSize, decoration: BoxDecoration( color: Color(0xFF55596D), borderRadius: BorderRadius.circular(imageSize / 2), ), child: Center( child: Image.asset( imagePath, width: imageSize * 0.5, height: imageSize * 0.5, ), ), ); }

4.使用网格列表构建整个列表UI

Widget buildInAudioList() { return Expanded( child: Padding( padding: EdgeInsets.symmetric(horizontal: 10,vertical: 40), child: GridView.count( crossAxisCount: 2,//固定列数 crossAxisSpacing: 15,//列间距 mainAxisSpacing: 20,//行间距 childAspectRatio: 155/170,//子项的宽高比 children: [ _buildInAudioItem( name: "苹果", images: ["assets/images/apple.png"], onTap: () => print("点击苹果"), ), _buildInAudioItem( name: "苹果+香蕉", images: ["assets/images/apple.png", "assets/images/banana.png"], onTap: () => print("点击苹果+香蕉"), ), _buildInAudioItem( name: "苹果、香蕉和樱桃", images: ["assets/images/apple.png", "assets/images/banana.png", "assets/images/cherry.png"], onTap: () => print("点击苹果、香蕉和樱桃"), ), _buildInAudioItem( name: "苹果", images: ["assets/images/apple.png"], onTap: () => print("点击苹果"), ), ], ), ), ); }

5.整个背景图

@override Widget build(BuildContext context) { return Scaffold( backgroundColor: Colors.transparent, body: Container( width: double.infinity, height: double.infinity, decoration: const BoxDecoration( gradient: LinearGradient( begin: Alignment.topCenter, end: Alignment.bottomCenter, colors: [ Color(0xFF060618), Color(0xFF070A23), ], ), ), child: Expanded( // 使用Expanded包裹GridView child: buildInAudioList(), ), ), ); }

代码实例

import 'package:flutter/cupertino.dart'; import 'package:flutter/material.dart'; class DemoPage extends StatefulWidget { const DemoPage({ super.key, }); @override State<DemoPage> createState() => _DemoPageState(); } class _DemoPageState extends State<DemoPage> { @override Widget build(BuildContext context) { return Scaffold( backgroundColor: Colors.transparent, body: Container( width: double.infinity, height: double.infinity, decoration: const BoxDecoration( gradient: LinearGradient( begin: Alignment.topCenter, end: Alignment.bottomCenter, colors: [ Color(0xFF060618), Color(0xFF070A23), ], ), ), child: Expanded( // 使用Expanded包裹GridView child: buildInAudioList(), ), ), ); } Widget buildInAudioList() { return Expanded( child: Padding( padding: EdgeInsets.symmetric(horizontal: 10,vertical: 40), child: GridView.count( crossAxisCount: 2,//固定列数 crossAxisSpacing: 15,//列间距 mainAxisSpacing: 20,//行间距 childAspectRatio: 155/170,//子项的宽高比 children: [ _buildInAudioItem( name: "苹果", images: ["assets/images/apple.png"], onTap: () => print("点击苹果"), ), _buildInAudioItem( name: "苹果+香蕉", images: ["assets/images/apple.png", "assets/images/banana.png"], onTap: () => print("点击苹果+香蕉"), ), _buildInAudioItem( name: "苹果、香蕉和樱桃", images: ["assets/images/apple.png", "assets/images/banana.png", "assets/images/cherry.png"], onTap: () => print("点击苹果、香蕉和樱桃"), ), _buildInAudioItem( name: "苹果", images: ["assets/images/apple.png"], onTap: () => print("点击苹果"), ), ], ), ), ); } //网格子项 Widget _buildInAudioItem({ required String name, required List<String> images, //关键：使用列表存储图片 required VoidCallback onTap, double imageSize = 40, }){ return Column( children: [ GestureDetector( onTap: onTap, child: Container( height: 150, width: 155, decoration: BoxDecoration( color:Color(0xFF1B1D2E), borderRadius: BorderRadius.circular(10) ), child: Center( child: _buildImageLayout(images,imageSize:imageSize), //关键：传递图片和图片尺寸给显示图片的方法 ), ), ), SizedBox(height: 8), Text(name,style: TextStyle(color: Colors.white,fontSize: 12),), ], ); } // 构建图片布局 Widget _buildImageLayout(List<String> images, {double imageSize = 40}) { int count = images.length; //传递的图片个数 if (count == 1) { // 单个图片居中显示 return Container( height: imageSize, width: imageSize, decoration: BoxDecoration( color: Color(0xFF55596D), borderRadius: BorderRadius.circular(imageSize / 2), ), child: Center( child: Image.asset( images[0], width: imageSize * 0.5, height: imageSize * 0.5, ), ), ); } else if (count == 2) { // 两个图片并排 return Row( mainAxisAlignment: MainAxisAlignment.center, children: [ _buildSingleImage(images[0], imageSize: imageSize), SizedBox(width: 5,), _buildSingleImage(images[1], imageSize: imageSize), ], ); } else if (count == 3) { // 三个或以上图片，显示前三个 return Row( mainAxisAlignment: MainAxisAlignment.center, children: [ _buildSingleImage(images[0], imageSize: imageSize), SizedBox(width: 5,), _buildSingleImage(images[1], imageSize: imageSize), SizedBox(width: 5,), _buildSingleImage(images[2], imageSize: imageSize), ], ); } return SizedBox.shrink(); } // 单个图片组件 Widget _buildSingleImage(String imagePath, {double imageSize = 40}) { return Container( height: imageSize, width: imageSize, decoration: BoxDecoration( color: Color(0xFF55596D), borderRadius: BorderRadius.circular(imageSize / 2), ), child: Center( child: Image.asset( imagePath, width: imageSize * 0.5, height: imageSize * 0.5, ), ), ); } }