提高Flutter应用性能的最佳实践
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.markdown-body h3:before { border-bottom: 2px solid rgba(77, 208, 225, 1); width: 100%; content: ""; display: block; height: 28px; position: absolute; left: 0; top: 0; bottom: -2px; margin: auto; background-size: 28px 28px; background-image: url("data:image/png;base64,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"); background-repeat: no-repeat; animation: 2s infinite alternate h3animationbefore }
@keyframes h3AnimationBefore { 0% { width: 28px } 25% { width: 100% } 50% { width: 100% } 100% { width: 100% } }
.markdown-body h3:after { content: ""; display: block; width: 28px; height: 28px; position: absolute; border: 2px solid rgba(77, 208, 225, 1); border-radius: 50%; right: -15px; top: 0; bottom: 0; margin: auto; background-size: 28px 28px; background-image: url("data:image/png;base64,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"); animation: 2s infinite alternate h3animationafter }
@keyframes h3AnimationAfter { 0% { } 10% { } 50% { transform: rotate(-1turn) } 100% { transform: rotate(-1turn) } }
.markdown-body h4 { font-size: 16px }
.markdown-body h5 { font-size: 15px }
.markdown-body h6 { margin-top: 5px }
.markdown-body p { line-height: inherit; margin: 22px 0; letter-spacing: 2px; font-size: 14px; word-spacing: 2px }
.markdown-body img { max-width: 80%; border-radius: 6px; display: block; margin: 20px auto !important; object-fit: contain; box-shadow: 0 0 16px rgba(110, 110, 110, 0.45) }
.markdown-body figcaption { display: block; font-size: 13px; color: rgba(43, 43, 43, 1) }
.markdown-body figcaption:before { content: ""; background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgBAMAAACBVGfHAAAAGFBMVEVHcExAuPtAuPpAuPtAuPpAuPtAvPxAuPokzOX5AAAAB3RSTlMAkDLqNegkoiUM7wAAAGBJREFUKM9jYBhcgMkBTUDVBE1BeDGqEtXychNUBeXlKEqACsrLQxB8lnCQQClCiWt5OYoSiAIkJVAF5eVBqAqAShTAAs7l5ShKWMwRAmAlSArASpAVgJUkCqIAscESHwCVVjMBK9JnbQAAAABJRU5ErkJggg=="); display: inline-block; width: 18px; height: 18px; background-size: 18px; background-repeat: no-repeat; background-position: center; margin-right: 5px; margin-bottom: -5px }
.markdown-body hr { border-top: 1px solid rgba(77, 208, 225, 1); border-right: none; border-bottom: none; border-left: none; margin-top: 32px; margin-bottom: 32px }
.markdown-body del { color: rgba(77, 208, 225, 1) }
.markdown-body code { border-radius: 2px; overflow-x: auto; background-color: rgba(77, 208, 225, 0.08); color: rgba(38, 198, 218, 1); padding: 0.195em 0.4em }
.markdown-body pre { font-family: Menlo, Monaco, Consolas, Courier New, monospace; overflow: auto; position: relative; line-height: 1.75; box-shadow: 0 0 8px rgba(110, 110, 110, 0.45); border-radius: 4px; margin: 16px }
.markdown-body pre:before { content: ""; display: block; height: 30px; width: 100%; margin-bottom: -7px; background: url("data:image/png;base64,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") 10px 10px / 40px no-repeat }
.markdown-body pre>code { font-size: 12px; padding: 15px 12px; margin: 0; word-break: normal; display: block; overflow-x: auto; color: rgba(51, 51, 51, 1); background: rgba(248, 248, 248, 1) }
.markdown-body a { color: rgba(77, 208, 225, 1); border-bottom: 1px solid rgba(77, 208, 225, 1); font-weight: 400; text-decoration: none; margin: 0 4px }
.markdown-body a:active, .markdown-body a:hover { background-color: rgba(77, 208, 225, 0.1) }
.markdown-body strong { color: rgba(38, 198, 218, 1) }
.markdown-body strong:before { content: "「" }
.markdown-body strong:after { content: "」" }
.markdown-body em { font-style: normal; color: rgba(77, 208, 225, 1); font-weight: 700 }
.markdown-body table { display: inline-block !important; font-size: 12px; width: auto; max-width: 100%; overflow: auto; border: 1px solid rgba(246, 246, 246, 1) }
.markdown-body thead { background: rgba(246, 246, 246, 1); color: rgba(0, 0, 0, 1); text-align: left }
.markdown-body tr:nth-child(2n) { background-color: rgba(77, 208, 225, 0.05) }
.markdown-body td, .markdown-body th { padding: 12px 7px; line-height: 24px }
.markdown-body td { min-width: 120px }
.markdown-body blockquote { margin: 2em 0; padding: 24px 32px; border-left: 4px solid rgba(38, 198, 218, 1); background: rgba(77, 208, 225, 0.15); position: relative }
.markdown-body blockquote:before { content: "❝"; top: 8px; left: 8px; color: rgba(77, 208, 225, 1); font-size: 30px; line-height: 1; font-weight: 700; position: absolute; opacity: 0.7 }
.markdown-body blockquote:after { content: "❞"; font-size: 30px; position: absolute; right: 8px; bottom: 0; color: rgba(77, 208, 225, 1); opacity: 0.7 }
.markdown-body blockquote p { color: rgba(89, 89, 89, 1); line-height: 2 }
.markdown-body ol, .markdown-body ul { color: rgba(89, 89, 89, 1); padding-left: 28px }
.markdown-body ol li, .markdown-body ul li { margin-bottom: 0; list-style: inherit }
.markdown-body ol li .task-list-item, .markdown-body ul li .task-list-item { list-style: none }
.markdown-body ol li .task-list-item ol, .markdown-body ol li .task-list-item ul, .markdown-body ul li .task-list-item ol, .markdown-body ul li .task-list-item ul { margin-top: 0 }
.markdown-body ol ol, .markdown-body ol ul, .markdown-body ul ol, .markdown-body ul ul { margin-top: 3px }
.markdown-body ol li { padding-left: 6px }
@media (max-width: 720px) { .markdown-body h1 { font-size: 24px } .markdown-body h2 { font-size: 20px } .markdown-body h3 { font-size: 18px } }.markdown-body pre, .markdown-body pre>code.hljs { color: rgba(169, 183, 198, 1); background: rgba(40, 43, 46, 1) }
.hljs-bullet, .hljs-literal, .hljs-number, .hljs-symbol { color: rgba(104, 151, 187, 1) }
.hljs-deletion, .hljs-keyword, .hljs-selector-tag { color: rgba(204, 120, 50, 1) }
.hljs-link, .hljs-template-variable, .hljs-variable { color: rgba(98, 151, 85, 1) }
.hljs-comment, .hljs-quote { color: rgba(128, 128, 128, 1) }
.hljs-meta { color: rgba(187, 181, 41, 1) }
.hljs-addition, .hljs-attribute, .hljs-string { color: rgba(106, 135, 89, 1) }
.hljs-section, .hljs-title, .hljs-type { color: rgba(255, 198, 109, 1) }
.hljs-name, .hljs-selector-class, .hljs-selector-id { color: rgba(232, 191, 106, 1) }
.hljs-emphasis { font-style: italic }
.hljs-strong { font-weight: 700 }
.markdown-body { line-height: 1.75; font-weight: 400; font-size: 15px; overflow-x: hidden; color: rgba(43, 43, 43, 1); font-family: -apple-system, system-ui, BlinkMacSystemFont, Helvetica Neue, PingFang SC, Hiragino Sans GB, Microsoft YaHei, Arial, sans-serif; background-image: linear-gradient(90deg, rgba(159, 219, 252, 0.15) 3%, rgba(0, 0, 0, 0) 0), linear-gradient(1turn, rgba(159, 219, 252, 0.15) 3%, rgba(0, 0, 0, 0) 0); background-size: 20px 20px; background-position: center }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4, .markdown-body h5, .markdown-body h6 { padding: 30px 0; margin-top: 35px; margin-bottom: 10px; color: rgba(77, 208, 225, 1) }
.markdown-body h1 { font-size: 30px; text-align: center; position: relative; width: max-content; margin: 0 auto }
.markdown-body h1:before { position: absolute; content: ""; z-index: -1; top: -20px; height: 100%; width: 100px; left: 0; right: 0; margin: 0 auto; background: 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@keyframes h1Animate { 0% { background-position: right bottom } 50% { background-position: right } 100% { background-position: right bottom } }
.markdown-body h2 { display: block; border-bottom: 4px solid rgba(77, 208, 225, 1); position: relative; font-size: 24px; padding: 12px 32px; margin: 30px 0 }
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.markdown-body h2:after, .markdown-body h2:before { content: ""; display: block; position: absolute; bottom: 0 }
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随着 Flutter 3.7 的发布，开发者们对应用性能的要求也日益增长。本指南旨在帮助开发者全面优化 Flutter 应用的性能，涵盖渲染、线程、写法、资源、代码、性能以及应用大小等多个方面。
1. 渲染优化
优化点：减少不必要的渲染。
// 避免不必要的重建
class MyWidget extends StatelessWidget {
final String text;
MyWidget(this.text);
@override
Widget build(BuildContext context) {
return Text(text);
}
}
问题：使用 StatefulWidget 时，可能会触发不必要的状态更新和重建。
优化点：使用 StatelessWidget 当组件不依赖于状态或配置变更时。
优化效果：减少了不必要的重建，提高了渲染性能。
2. 线程优化
优化点：将计算密集型任务放在后台线程执行。
Future<void> computeExpensiveTask() async {
final result = await compute(expensiveFunction, arguments);
// 更新 UI
}
int expensiveFunction(List<int> arguments) {
// 执行计算密集型任务
}
问题：在 UI 线程执行计算密集型任务会导致应用卡顿。
优化点：使用 compute 函数将任务转移到后台线程。
优化效果：保持了 UI 的流畅性，提高了应用响应速度。
3. 写法优化
优化点：避免不必要的状态更新。
class MyStatefulWidget extends StatefulWidget {
@override
_MyStatefulWidgetState createState() => _MyStatefulWidgetState();
}
class _MyStatefulWidgetState extends State<MyStatefulWidget> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('You have pushed the button this many times: $_counter'),
RaisedButton(
onPressed: _incrementCounter,
child: Text('Increment'),
),
],
);
}
}
问题：在 setState 中频繁更新状态可能导致性能下降。
优化点：只在状态实际发生变化时调用 setState。
优化效果：减少了不必要的状态更新，提高了性能。
4. 资源优化
优化点：压缩图像资源。
# 在 pubspec.yaml 中配置图像压缩
flutter:
assets:
- images/my_image.png
- images/my_other_image.webp
问题：未压缩的图像资源可能导致 APK 大小增加。
优化点：使用 Flutter 默认的图像压缩或将图像转换为更高效的格式，如 WebP。
优化效果：减少了 APK 大小，加快了应用安装速度。
5. 代码优化
优化点：使用 Dart 的语言特性进行代码优化。
// 使用 Dart 的扩展方法
extension StringExt on String {
String capitalize() => this[0].toUpperCase() + this.substring(1);
}
// 使用 Dart 的不可变对象
final List<int> immutableList = List.unmodifiable([1, 2, 3]);
问题：代码冗余或不合理的数据结构可能导致性能下降。
优化点：利用 Dart 的扩展方法减少代码冗余，使用不可变对象提高性能。
优化效果：代码更简洁，性能有所提升。
6. 性能优化
优化点：使用 Flutter Profiler 分析性能。
// 在代码中添加性能分析标记
void _someFunction() {
FlutterError.onError = (FlutterErrorDetails details) {
// 处理错误
};
// 执行性能敏感的代码
}
问题：难以识别性能瓶颈。
优化点：使用 Flutter Profiler 工具分析应用性能，找出瓶颈并进行优化。
优化效果：能够精准定位并优化性能瓶颈，提高应用的整体性能。
7. 大小优化
优化点：减少 APK 的大小。
# 在 pubspec.yaml 中配置代码分割
flutter:
split-per-abi: true
问题：APK 文件过大可能导致用户下载和安装时间较长。
优化点：使用 Flutter 的代码分割功能，针对不同的 ABI 分割代码，减少 APK 的大小。
优化效果：减少了 APK 的大小，加快了用户的下载和安装速度。
优化插件
当然了，总是会有一些大佬开源出一些优秀的插件，官方也会放出相关插件，来帮助我们提高自己的 Flutter应用程序，下面是我搜集的一些比较优秀的插件，大家可以参考一下，当然你们若是有更好的插件，也可以分享在评论区。
Flutter DevTools
Flutter DevTools 是一个强大的性能分析和调试工具，可以帮助开发者识别和解决性能问题，优化应用性能。
Flutter Inspector
Flutter Inspector 允许开发者在运行时检查 Flutter 应用的 UI 树和性能数据，帮助开发者快速定位和优化性能问题。
Perfino
Perfino 是一个专业的性能分析工具，提供了详细的性能数据和建议，帮助开发者快速找出性能瓶颈并进行优化。
Timeline Viewer
Timeline Viewer 可以可视化 Flutter 应用的事件时间线，帮助开发者分析应用的性能表现，找出潜在的性能问题。
Freddy
Freddy 是一个性能分析工具，它可以生成性能报告并提供优化建议，帮助开发者提高 Flutter 应用的性能。
结论
通过学习和遵循本文中的最佳实践和使用优化插件，大家可以显著提高 Flutter 应用的性能。不断优化并监控应用性能是确保用户体验的关键。随着 Flutter 社区的不断发展和新版本的发布，优秀如大家，肯定会探索出更多的优化方法和最佳实践，使我们的 Flutter 应用的性能不断提升。
若是掌门人有不对的地方，欢迎指出问题。
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