203页，chapter7/flutter_route/lib/todo.dart 路径中少了个s，具体请看我提交的 PR

#2

可以考虑利用docker方式配置服务端，让读者能更快的专注flutter的学习开发。

如果一个移动端实战类教程会耗费较多时间在后端环境搭建上，读者可能就会考虑换一个教程了。

IDE ：Android studio 4.1.1
启动时报如下错误：

event sent after app closed: {id: 0, progressId: null, message: Running "flutter pub get" in flutter_bottomnav...}
event sent after app closed: {id: 0, progressId: null, finished: true}
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Warning
──────────────────────────────────────────────────────────────────────────────
Your Flutter application is created using an older version of the Android
embedding. It's being deprecated in favor of Android embedding v2. Follow the
steps at

https://flutter.dev/go/android-project-migration

to migrate your project.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Launching lib/main.dart on Mi 10 Pro in debug mode...
[!] Your app isn't using AndroidX.
To avoid potential build failures, you can quickly migrate your app by following the steps on https://goo.gl/CP92wY .
Running Gradle task 'assembleDebug'...
/Users/zhuzhiqiang/gradle-4.5.1/.gradle/caches/transforms-1/files-1.1/core-1.1.0.aar/99875dad3578891d7a573f3ed4990bf2/res/values/values.xml:7:5-70: AAPT: error: resource android:attr/fontVariationSettings not found.

/Users/zhuzhiqiang/gradle-4.5.1/.gradle/caches/transforms-1/files-1.1/core-1.1.0.aar/99875dad3578891d7a573f3ed4990bf2/res/values/values.xml:7:5-70: AAPT: error: resource android:attr/ttcIndex not found.

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:processDebugResources'.

Failed to process resources, see aapt output above for details.

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 13s
Exception: Gradle task assembleDebug failed with exit code 1

跟着上面的提示修改了一下
在 pubspec.yaml 添加了
module:
androidX: true

并在android/gradle.properties里面添加了
android.useAndroidX=true
android.enableJetifier=true

然后执行flutter clean

还是无法启动

event sent after app closed: {id: 0, progressId: null, message: Running "flutter pub get" in flutter_bottomnav...}
event sent after app closed: {id: 0, progressId: null, finished: true}
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Warning
──────────────────────────────────────────────────────────────────────────────
Your Flutter application is created using an older version of the Android
embedding. It's being deprecated in favor of Android embedding v2. Follow the
steps at

https://flutter.dev/go/android-project-migration

to migrate your project.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Launching lib/main.dart on Mi 10 Pro in debug mode...
Running Gradle task 'assembleDebug'...

1. 在9.3.1创建Flutter模块时，执行flutter create -t module flutter_module，会报错Got socket error trying to find package cupertino_icons at https://pub.flutt。
2. 在9.3.2 settings.gradle里面，flutter_module/.android/include_flutter.groovy 报错Caused by: java.io.FileNotFoundException:，同时在您的demo里面flutter_module文件夹下并没有.android文件夹。

2.3章节错误

var val = 12 ~/7;
print(val);  //结果是 3 

结果是1

不要误人子弟