Flutter 集成到Android项目中遇到的坑

「爱情、让人受尽委屈。」 2021-11-11 11:52 1928阅读 0赞

**目录**

1.VM snapshot invalid and could not be inferred from settings/Could not setup VM data to bootstrap the VM from.

2.couldn't find "libflutter.so"

3.ERROR: Java 8 language support, as requested by 'android.enableD8.desugaring= true' in your gradle.properties file, is not supported when 'android.useDexArchive= false'. Affected Modules: flutter

4./Users/\*/\*/WorkSpace/my\_flutter/.android/include\_flutter.groovy

5.D8: Invoke-customs are only supported starting with Android O (--min-api 26)

6.Unable to run flutter from Android Studio- Entry point isn't within current project

7.Android Studio not found at /Users/\*/Application/Android Studio.app/Contents

8.flutter项目在Android Studio中显示no devices，没法flutter run

9.ndk \{ abiFilters "armeabi" \}打包apk，找不到libflutter.so

lib/armeabi, /vendor/lib, /system/lib\]\]\] couldn't find "libflutter.so"

10.org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:transformClassesWithDexForDebug'.

11.签名打包，运行崩溃

\[FATAL:flutter/shell/platform/android/library\_loader.cc(24)\] Check failed: result.

--------------------

# 1.VM snapshot invalid and could not be inferred from settings/Could not setup VM data to bootstrap the VM from. #

完整的报错日志：

[ERROR:flutter/runtime/dart_vm_data.cc(19)] VM snapshot invalid and could not be inferred from settings.
    [ERROR:flutter/runtime/dart_vm.cc(241)] Could not setup VM data to bootstrap the VM from.
    [ERROR:flutter/runtime/dart_vm_lifecycle.cc(89)] Could not create Dart VM instance.
    [FATAL:flutter/shell/common/shell.cc(218)] Check failed: vm. Must be able to initialize the VM.

flutter项目集成到Android原生项目后，有时候汇报上面的错误：

解决方法：

1.在AS中打开flutter项目  
2.命令行执行：flutter clean  
3.cd .android  
4../gradlew clean  
5../gradlew assembleDebug  
6.回到Android项目中运行APP(不需要 sync 或 rebuild)

以上方法治标不治本，有时还会出现，于是对比了demo的build目录和公司项目的build目录，找到了原因：缺少flutter\_assets文件  
下面是demo的flutter build目录

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2w3MDc5NDE1MTA_size_16_color_FFFFFF_t_70][]

下面是公司项目的flutter目录

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2w3MDc5NDE1MTA_size_16_color_FFFFFF_t_70 1][]

可以看出公司项目out文件下没有flutter\_assets，于是我就对比了一下build日志，把关于flutter的日志都对比了一下。

这个是demo编译的日志

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xNzA3ODI5LWQyNzQyNDU5MWE3NDJjZjUucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

这是公司项目的编译日志

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xNzA3ODI5LTA5NWRmYTdiYjAzNmRiMTEucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

大致可以定位到时没有执行`copyFlutterAssetsDevelopmentDebug`

flutter module的build.gradle没有执行copyFlutterAssets，是它依赖的flutter.gradle执行的。  
找到`$flutterRoot/packages/flutter_tools/gradle/flutter.gradle`，搜索copyFlutterAssets。

可以找到有个`copyFlutterAssetsTask`，就是它没有被执行，看下gradle里是怎么写的。

![aHR0cHM6Ly91cGxvYWQtaW1hZ2VzLmppYW5zaHUuaW8vdXBsb2FkX2ltYWdlcy8xNzA3ODI5LTI5MjgwNWNjZGExMTFmNzUucG5nP2ltYWdlTW9ncjIvYXV0by1vcmllbnQvc3RyaXAlN0NpbWFnZVZpZXcyLzIvdy8xMDAwL2Zvcm1hdC93ZWJw][]

根据打印日志发现走的是上面的if分支，通过代码可以看出：  
**gradle根据`mainModuleName`去找`mergeAssets`，如果Android项目没有配置`project.rootProject.ext.mainModuleName`，就会默认用"app"这个名字去找`mergeAssets`，而我们公司项目的app module的名字是"app.oa"而不是"app"，也没有配置`project.rootProject.ext.mainModuleName`，所以没找到mergeAssets，mergeAssets为null，就没有去执行`copyFlutterAssets`。**

终极解决方案：在settings.gradle文件中加上**`mainModuleName``的配置`**

setBinding(new Binding([gradle: this, mainModuleName: '主module名称']))
    evaluate(new File(
            settingsDir.parentFile,
            'my_flutter/.android/include_flutter.groovy'
    ))

# 2.couldn't find "libflutter.so" #

引发的原因

导致这个问题出现的原因是因为我们在项目种使用了so库，或者项目中引用的三方sdk使用了so库。在引用so库时需要针对不同的cpu架构使用不同的.so文件。armeabi，armeabi-v7a，x86，arm64-v8a，大家通常会对这几个cpu架构进行适配。然而问题就出在现在Flutter在打包Apk时不能同引入arm32和arm64的`libflutter.so`。我门将打好包的Apk安装到arm64架构（默认打包会引入arm32）的手机上就出现了couldn't find `libflutter.so`这个异常。

解决方式：在app的build.gradle中android下的buildTypes中添加armeabi-v7a

buildTypes {
         release {
             ndk{
                 //这里其实我觉可以直接是用"armeabi-v7a"，但国内大多使用的都是"armeabi"
                 abiFilters "armeabi"
             }
         }
         debug {
             ndk {
                 //这里要加上，否则debug包会出问题,后面两个为可选，x86建议加上不然部分模拟器回报错
                 abiFilters "armeabi","armeabi-v7a","arm64-v8a", "x86"
             }
         }
     }

添加armeabi-v7a后，发现项目中其他模块报错了，解决方式就是在soLibs中新建一个armeabi-v7a文件夹，把报错的.so文件从armeabi文件夹中的copy一份，例如我的报找不到libvadLib.so,就从armeabi文件中复制一份到armeabi-v7a文件即可

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2w3MDc5NDE1MTA_size_16_color_FFFFFF_t_70 2][]

# 3.ERROR: Java 8 language support, as requested by 'android.enableD8.desugaring= true' in your gradle.properties file, is not supported when 'android.useDexArchive= false'. Affected Modules: flutter #

按照官方文档把flutter项目集成到现有Android项目中时，报错，如上

解决方法：在gradle.propertites文件中加上：

android.enableD8.desugaring= true
    android.useDexArchive= true

此种解决方式并不是最优，还会报警告错误，但是可以正常运行代码

# 4./Users/\*/\*/WorkSpace/my\_flutter/.android/include\_flutter.groovy #

错误原因：

AS创建的flutter项目集成到现有项目中报错，原因是没有.android隐藏文件，只有使用命令：

flutter create -t module flutter_module

创建的flutter项目才有.android文件

解决方法：用命令生成flutter项目，缺点是项目中没有android文件目录，导致报：AndroidManifest.xml could not be found.（可以用AS创建一个相同名字的项目，把android文件拷过来）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2w3MDc5NDE1MTA_size_16_color_FFFFFF_t_70 3][]

# 5.D8: Invoke-customs are only supported starting with Android O (--min-api 26) #

flutter集成到Android项目中，启动Android项目点击flutter模块，报错

解决方法：在`android/app/build.gradle`文件中的android项中加入如下设置即可:

compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
        incremental false
    }

# 6.Unable to run flutter from Android Studio- Entry point isn't within current project #

![image][]

flutter集成到Android项目后，打开flutter项目，项目结构错乱

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2w3MDc5NDE1MTA_size_16_color_FFFFFF_t_70 4][]

解决方式：

File -> Project Structure -> Module然后添加项目的根文件夹，然后它将再次检测到它是一个flutter的应用程序，然后再次构建和工作。

# 7.Android Studio not found at **/Users/\***/Application/Android Studio.app/Contents #

当运行flutter doctor -v命令时：发现flutter配置项报错，如下图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2w3MDc5NDE1MTA_size_16_color_FFFFFF_t_70 5][]

\[!\] Android Studio

**   ** **✗** **Flutter plugin not installed; this adds Flutter specific functionality.**

**   ** **✗** **Dart plugin not installed; this adds Dart specific functionality.**

**   ** **✗ Android Studio not found at /Users/\*/Application/Android Studio.app****/Contents**

**解决方法：运行命令：****flutter config --android-studio-dir= **

flutter config --android-studio-dir=

删除android-studio-dir设置,重启项目运行flutter doctor -v查看

# 8.flutter项目在Android Studio中显示no devices，没法flutter run #

![aHR0cHM6Ly91c2VyLWdvbGQtY2RuLnhpdHUuaW8vMjAxOC8xMi8xMS8xNjc5YjZjNDU4OWMyMzUzP2ltYWdlVmlldzIvMC93LzEyODAvaC85NjAvZm9ybWF0L3dlYnAvaWdub3JlLWVycm9yLzE][]

解决方法：

Fill --> Other Settings --> Default Project Structure...找到Android SDK的路径，如图

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2w3MDc5NDE1MTA_size_16_color_FFFFFF_t_70 6][]

运行命令：

flutter config --android-sdk {上面截图中的SDK路径}

重启AndroidStudio即可显示连接的真机设备

# 9.ndk \{ abiFilters "armeabi" \}打包apk，找不到libflutter.so #

# lib/armeabi, /vendor/lib, /system/lib\]\]\] couldn't find "libflutter.so" #

问题出现原因：Flutter官方只提供了四种CPU架构的SO库：armeabi-v7a、arm64-v8a、x86和x86-64，其中x86系列只支持Debug模式，但是公司原项目中大多SDK都只提供了armeabi架构的库(比如地图sdk和语音sdk等)，这就导致了打包时缺少armeabi的libflutter.so库而无法运行flutrer模块，按照[美团技术方案][Link 1]的SO库兼容性这一块，复制armeabi-v7a中的so到armeabi中，结果release包flutter模块报Check failed: vm. Must be able to initialize the VM

解决方案：尝试使用aar的方式集成到原项目，参考我的另一篇文章：[Flutter 打包aar集成到Android项目][Flutter _aar_Android]

# 10.org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:transformClassesWithDexForDebug'. #

命令行中执行如下命令查看详细报错（需先切换到当前工程目录下）：

Windows:       gradlew clean build --stacktrace

MAC/Linux:   ./gradlew clean build --stacktrace

查看详细的报错，发现存在如下报错：

Uncaught translation error: com.android.dx.cf.code.SimException: invalid opcode ba (invokedynamic requires --min-sdk-version >= 26)

解决方案：

build.gradle中android节点下增加如下配置：

compileOptions {
            sourceCompatibility JavaVersion.VERSION_1_8
            targetCompatibility JavaVersion.VERSION_1_8
        }

# 11.签名打包，运行崩溃 #

# \[FATAL:flutter/shell/platform/android/library\_loader.cc(24)\] Check failed: result. #

既然debug运行ok，八成就是签名文件的问题了。添加flutter混淆：

-keep class io.flutter.facade.**{*;}
    -keep class io.flutter.plug.**{*;}
    -keep class io.flutter.app.** { *; }
    -keep class io.flutter.plugin.**  { *; }
    -keep class io.flutter.util.**  { *; }
    -keep class io.flutter.view.**  { *; }
    -keep class io.flutter.**  { *; }
    -keep class io.flutter.plugins.**  { *; }

如果你觉得对你有用，就点个赞支持一下吧~ 谢谢啦~

--------------------

持续更新。。。

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[image]: /images/20211109/6d52c0e9ef46473fb0c8dc54a09256a1.png
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[Link 1]: https://tech.meituan.com/2018/08/09/waimai-flutter-practice.html
[Flutter _aar_Android]: https://blog.csdn.net/l707941510/article/details/99757995