Flutter编译选项,flutter 条件编译

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Flutter在Debug和Release下分别使用什么编译模式，有什么区别？

Debug模式下使用JIT编译模式，即Just in time(即时编译)，Release下使用AOT模式，即Ahead of time(提前编译)。JIT模式因为需要边运行边编译，所以会占用运行时内存，导致卡顿现象，但是有动态编译效果对于开发者来说非常方便调试。AOT模式提前编译不会占用运行时内存，相对来说运行流畅，但是会导致编译时间增加。

相关问答

Q1: 【Android开发学Flutter】Xcode编译问题汇总

Xcode编译经常遇到各种问题，处理起来费时费力，挺打击学习积极性的。记录下这些问题，方便自己也帮助后来人。

编译的时候遇到：

网上有很多解决方法，我是用这个方法解决的：

编译的时候遇到：

解决办法：

Project - User-Defined - FLUTTER_ROOT 改成本地 flutter SDK路径

感谢 issues 上的小哥，给你个?

在项目目录下执行 flutter run 可以正常运行到手机，但是在Xcode build 还是有问题。

这时需要手动添加 FLUTTER_ROOT 到 User-Defined ：

添加之后：

就可以正常在Xcode build 安装到手机了。

flutter build ios 后出现：

pod install 后出现：

解决办法：

这是因为terminal没有走代理的流量，

使用 git config --global http.proxy "localhost:port" ，设置代理。

port是端口号，根据不同的vpn不一样，我的端口是10080。

执行 git config --global http.proxy "localhost:10080"

Xcode build 的时候出现：

解决办法：打开 ios/Podflie 文件：

关于 bitcode 的问题，我检查了下用到的第三方SDK，应该是百度地图的问题，我引入了个第三方插件（吐槽下没官方插件），百度地图有支持和不支持 bitcode 的两个SDK，我取消这个插件就没有报这个错了，奇怪的是，再次引入同一个插件，也可以正常打包，所以说这个问题还没有完全解决。

大家可以试下这个处理方法：

TARGETS - Build Seettings 搜 arm ，试一下把其他删除，只留下armv7跟armv7s或者只留下armv7

解决办法：

我是clean Xcode之后就可以了

解决办法：

用的是P12证书，改成手动签名：

Q2: Flutter开发解决iOS编译不兼容Swift

在进行Flutter开发过程中，很容易出现iOS原生端编译不成功的问题，比如出现Undefined symbol:__swift_FORCE_LOAD_$_swfitCoreLocation

出现这种情况的时候，为没有导入swift头文件导致编译不成功，解决办法为：

1、新建选中Runner右键New File 选择Swift File

2、点击create的时候会出现选择Xcode - Create Bridging Header

3、随后会创建一个Runner-Bridging-Heading.h的文件

4、正常运行项目即可

一般此情况多出现在第一次运行iOS的情况，为导入过支持Swift后XCode没有进行兼容导致的问题。

Q3: flutter 反编译

You are building a fat APK that includes binaries for android-arm, android-arm64.

If you are deploying the app to the Play Store, it's recommended to use app bundles or split the APK to reduce the APK size.

To generate an app bundle, run:

flutter build appbundle --target-platform android-arm,android-arm64

Learn more on:

To split the APKs per ABI, run:

flutter build apk --target-platform android-arm,android-arm64 --split-per-abi

Learn more on:

Initializing gradle... 2.3s

Resolving dependencies... 14.2s

Running Gradle task 'assembleRelease'... ע: E:\work_tool\flutter\.pub-cache\hosted\pub.flutter-io.cn\connectivity-0.4.4\android\src\main\java\io\flutter\plugins\connectivity\ConnectivityPlugin.javaʹ�û?��ѹ�ʱ�� API��

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ע: E:\work_tool\flutter\.pub-cache\hosted\pub.flutter-io.cn\url_launcher-5.1.3\android\src\main\java\io\flutter\plugins\urllauncher\WebViewActivity.javaʹ

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Calling mockable JAR artifact transform to create file: C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\android.jar\baf414ed95f14e507d85c560886dfbe2\android.jar with input E:\work_tool\sdk\android-sdk-windows\platforms\android-28\android.jar

Calling mockable JAR artifact transform to create file: C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\android.jar\ab096bb3fb172ccb785acdb1058c10a9\android.jar with input E:\work_tool\sdk\android-sdk-windows\platforms\android-27\android.jar

Request to incrementing alive workforce from 0. Current workforce (dead or alive) 0

thread-pool size=4

ProGuard, version 6.0.3

Reading input...

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\flutter.jar\ab2691c929f4d2aa57a17fa551e662a6\jetified-flutter.jar] (filtered)

Reading program jar [F:\dartSpace\flutter\jiddspace\nfc\build\app\intermediates\flutter\release\libs.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\localbroadcastmanager-1.0.0.aar\7a407f962902eada026a8e241a760bac\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\work-runtime-2.1.0.aar\8e3a1e8a8ff79006a94df6c01ceeb4f5\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\fragment-1.1.0.aar\4fa7d1b49e3514cb08c8a696f9b59436\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\room-runtime-2.1.0.aar\1b8774fa39759f08defb930275652eac\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\room-runtime-2.1.0.aar\1b8774fa39759f08defb930275652eac\jars\libs\room-common-java8-2.1.0.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\viewpager-1.0.0.aar\885186e7f6f969363bc93cd607d741a5\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\loader-1.0.0.aar\f84f22ad0a97d2c689850b912fc04277\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\activity-1.0.0.aar\a46db1490fae1b9001fc672a24eb288f\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\customview-1.0.0.aar\fe8bf4a709414e884086911d2168b715\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\core-1.1.0.aar\87febb54759dd5a2c7be8e971d745644\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\versionedparcelable-1.1.0.aar\754157c6f50ca4e4cf3ac8d7cb5ced26\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\androidx.collection\collection\1.1.0\1f27220b47669781457de0d600849a5de0e89909\collection-1.1.0.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\lifecycle-livedata-2.0.0.aar\de6944801d37d99b1dd0b877649fde1f\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\lifecycle-livedata-core-2.0.0.aar\e21d6663beb6faa41a30fd5a582cb4d9\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\core-runtime-2.0.1.aar\724bb0cc2ce99eaf0a23a99bb1cc5c23\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\androidx.room\room-common\2.1.0\b87765704590bd992ea0d92ac50253a9df7818a0\room-common-2.1.0.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\sqlite-framework-2.0.1.aar\9cbdf82e938f7e565620a3682d2406e9\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\sqlite-2.0.1.aar\1215aa5476f752bd431fb2d8059a1a39\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\lifecycle-service-2.0.0.aar\9d24ebd4d6766d7b2cd515369a737934\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\lifecycle-runtime-2.1.0.aar\ca02c0867547ae607130bcc54a4a9ba5\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\lifecycle-viewmodel-2.1.0.aar\594e1ff6298a01d8933530bb534fa472\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\transforms-1\files-1.1\savedstate-1.0.0.aar\8a2c3791a34fc80e5d9d268bf2886f95\jars\classes.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\androidx.lifecycle\lifecycle-common\2.1.0\c67e7807d9cd6c329b9d0218b2ec4e505dd340b7\lifecycle-common-2.1.0.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\androidx.arch.core\core-common\2.1.0\b3152fc64428c9354344bd89848ecddc09b6f07e\core-common-2.1.0.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\androidx.annotation\annotation\1.1.0\e3a6fb2f40e3a3842e6b7472628ba4ce416ea4c8\annotation-1.1.0.jar] (filtered)

Reading program jar [C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\com.google.guava\listenablefuture\1.0\c949a840a6acbc5268d088e47b04177bf90b3cad\listenablefuture-1.0.jar] (filtered)

Reading program jar [F:\dartSpace\flutter\jiddspace\nfc\build\flutter_downloader\intermediates\intermediate-jars\release\classes.jar] (filtered)

Reading program jar [F:\dartSpace\flutter\jiddspace\nfc\build\shared_preferences\intermediates\intermediate-jars\release\classes.jar] (filtered)

Reading program jar [F:\dartSpace\flutter\jiddspace\nfc\build\url_launcher\intermediates\intermediate-jars\release\classes.jar] (filtered)

Reading program jar [F:\dartSpace\flutter\jiddspace\nfc\build\sqflite\intermediates\intermediate-jars\release\classes.jar] (filtered)

Reading program jar [F:\dartSpace\flutter\jiddspace\nfc\build\connectivity\intermediates\intermediate-jars\release\classes.jar] (filtered)

Reading program jar [F:\dartSpace\flutter\jiddspace\nfc\build\path_provider\intermediates\intermediate-jars\release\classes.jar] (filtered)

Reading program jar [F:\dartSpace\flutter\jiddspace\nfc\build\package_info\intermediates\intermediate-jars\release\classes.jar] (filtered)

Reading program directory [F:\dartSpace\flutter\jiddspace\nfc\build\app\intermediates\javac\release\compileReleaseJavaWithJavac\classes] (filtered)

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Reading library jar [C:\Users\Administrator\.gradle\caches\modules-2\files-2.1\androidx.annotation\annotation\1.0.0\45599f2cd5965ac05a1488fa2a5c0cdd7c499ead\annotation-1.0.0.jar] (filtered)

Reading library jar [E:\work_tool\sdk\android-sdk-windows\platforms\android-28\android.jar]

Reading library jar [E:\work_tool\sdk\android-sdk-windows\build-tools\28.0.3\core-lambda-stubs.jar]

Reading library jar [E:\work_tool\sdk\android-sdk-windows\platforms\android-28\optional\org.apache.http.legacy.jar]

Reading library jar [E:\work_tool\sdk\android-sdk-windows\platforms\android-28\optional\android.test.mock.jar]

Reading library jar [E:\work_tool\sdk\android-sdk-windows\platforms\android-28\optional\android.test.base.jar]

Reading library jar [E:\work_tool\sdk\android-sdk-windows\platforms\android-28\optional\android.test.runner.jar]

Initializing...

Warning: io.flutter.embedding.android.FlutterView: can't find referenced method 'android.graphics.Insets getSystemGestureInsets()' in library class android.view.WindowInsets

Warning: io.flutter.embedding.android.FlutterView: can't find referenced class android.graphics.Insets

Warning: io.flutter.view.FlutterView: can't find referenced method 'android.graphics.Insets getSystemGestureInsets()' in library class android.view.WindowInsets

Warning: io.flutter.view.FlutterView: can't find referenced class android.graphics.Insets

Note: io.flutter.view.AccessibilityViewEmbedder$ReflectionAccessors: can't find dynamically referenced class android.util.LongArray

Warning: io.flutter.view.FlutterView: can't find referenced class android.graphics.Insets

Note: there were 1 unresolved dynamic references to classes or interfaces.

You should check if you need to specify additional program jars.

()

Warning: Exception while processing task java.io.IOException: Please correct the above warnings first.

Thread(Tasks limiter_1): destruction

Warning: there were 12 unresolved references to classes or interfaces.

You may need to add missing library jars or update their versions.

If your code works fine without the missing classes, you can suppress

the warnings with '-dontwarn' options.

()

Warning: there were 2 unresolved references to library class members.

You probably need to update the library versions.

()

FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.

Job failed, see logs 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

BUILD FAILED in 4m 23s

Running Gradle task 'assembleRelease'...

Running Gradle task 'assembleRelease'... Done 264.4s (!)

*******************************************************************************************

The Gradle failure may have been because of AndroidX incompatibilities in this Flutter app.

See for more information on the problem and how to fix it.

*******************************************************************************************

Gradle task assembleRelease failed with exit code 1

Q4: Flutter工程化之iOS混编集成

在flutter官网上推荐了iOS项目中两种混编方式：

笔者在采用两种集成方式的过程中，因为iOS项目结构设计导致这两种简单的集成方式都有些麻烦，所以在实践中更改和优化了集成方式，使之在笔者的项目中能够更加简单和快速的集成。

问题：在不更改flutter tool中相关脚本的前提下，添加的Script Phase中的脚本相对路径错误，如果只是开发，手动更改下路径就可以了，但是在考虑到CI中不能每次在pod install之后都去更改，所以在开发调试中采用该集成方式，结合flutter attach的方式去调试。

通过编译相关的 xcframework + Cocoapods私有库的集成方式在CI中集成，这样QA的CI不需要配置flutter的相关依赖

根据flutter编译工具的提示：上面的编译命令是打包flutter工程项目和插件的产物，在实际开发过程中可以发现是否引入了依赖Native的插件会导致贬义编译产物的不同。

根据上面的对比：

第一部分：基础的 Flutter Engine + Flutter App 编译后的产物 Flutter.xcframwork -- Flutter引擎的包 App.xcframework -- 工程项目对应的AOT的编译产物第二部分：三方插件的注册中心 FlutterPluginRegistrant.xcframework -- 第三方插件的注册中心，其实是Native + iOS通信的集合第三部分：依赖iOS Native的原生 FMDB . xcframwork path_provider_ios.xcframework sqflite.xcframework -- cached_network_image依赖的原生实现

根据上面的编译产物可以知道Flutter和App是编译后必有的包，后面的两个部分完全是服务于三方插件的，到这可以解答第二个问题：笔者App的混编过程中混编插件失效是因为笔者在NativeApp中重写了Flutter的容器，使用了FlutterEngineGroup动态创建多引擎去对应进入不同的功能模块，混合插件是因为重写过程中没有通过GeneratedPluginRegistrant注册插件，所以需要在Native的Flutter容器中注册插件，使之生效。

在这为什么使用commit的hash作为flutter-libs的依赖，因为pod install的时候会有缓存，除了版本好，commit hash也能保证每次CI编译通过 pod install 来更新flutter-libs依赖产物

完成！！！

Q5: Flutter-02编译器选择

1.打开 VS Code。

2.打开查看命令面板…。

3.输入 “install”，然后选择扩展: 安装扩展(就是点击选择第一行内容)。

4.在扩展搜索输入框中输入 “flutter”，然后在列表中选择 Flutter 并单击安装。此过程中会自动安装必需的 Dart 插件。（选择第一行并安装）

5.退出然后重新启动 VS Code。

1.打开查看命令面板…。

2.输入 “doctor”，选择 Flutter: Run Flutter Doctor。

3.打开输出 (OUTPUT) 面板查看是否有错误，确保在不同的输出选项 (Output Options) 的下拉列表中选择了 Flutter。

我们在上篇文章已经用命令行创建了一个 my_app 的flutter项目了，这里我们就可以使用 vscode 打开看看了