1、环境

• Unity 2021.3.8f1

2、基础知识梳理

2.1 自定义配置文件用途

1、mainTemplate.gradle
配置构建Android Library的信息。
在Gradle工程中，对应unityLibrary/build.gradle
Unity的内容应当构建为一个Android Library程序(Unity主程序)，这样它可以嵌入到其他Android程序中。

2、launcherTemplate.gradle
配置构建独立Android应用（启动程序）的指令。
在Gradle工程中，对应launcher/build.gradle

3、baseProjectTemplate.gradle
配置在所有其他Template、Gradle工程中都共享的内容。
在Gradle工程中，对应build.gradle。

4、gradleTemplate.properties
配置Gradle构建需要的环境。如：JVM内存、是否支持多JVM、是否压缩native libs
在Gradle工程中，对应gradle.properties。

5、LauncherManifest.xml
启动程序的Manifest配置文件
在Gradle工程中，对应launcher/src/main/AndroidManifest.xml。

6、AndroidManifest.xml（MainManifest）
游戏主程序的Manifest配置文件
在Gradle工程中，对应unityLibrary/src/main/AndroidManifest.xml。

中途报错解决

1、不能使用Plugins/Android/assets目录放资源

Error building Player: Exception: OBSOLETE - 
Providing Android resources in Assets/Plugins/Android/assets was removed, 
please move your resources to an AAR or an Android Library. 
See "AAR plug-ins and Android Libraries" section of the Manual for more details.

解决：

正经的解决方法有两个：
1、将assets资源打包到一个aar文件里，放到Plugins/Android目录下
2、将assets下的资源放到一个独立Android Library子模块里（也就是带.androidlib的目录里，如：mylib.androidlib）

这里我们平台同学发现一个“漏洞”，丢在StreamingAssets里的文件，跟Plugins/Android/assets里的文件最终会放到一起~

最终我们决定把资源直接放到StreamingAssets里

2、IL2CPP模式编译ARM64的apk失败

Building Library\Bee\artifacts\Android\d8kzr\libil2cpp.so failed with output:
Library/Bee/artifacts/Android/87lik/03uo_osix1.lump.o: In function `std::__ndk1::_DeallocateCaller::__do_call(void*)':
E:/SDK\android-ndk-r21d\toolchains\llvm\prebuilt\windows-x86_64\bin\..\sysroot\usr\include\c++\v1/new:334:(.text._ZNSt6__ndk112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEED2Ev[_ZNSt6__ndk112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEED2Ev]+0x10): relocation truncated to fit: R_AARCH64_JUMP26 against symbol `operator delete(void*)' defined in .text._ZdlPv section in E:/SDK/android-ndk-r21d/toolchains/llvm/prebuilt/windows-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android\libc++_static.a(new.o)
Library/Bee/artifacts/Android/87lik/03uo_osix1.lump.o: In function `il2cpp::os::Console::InternalKeyAvailable(int)':
E:/Unity\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\os\Posix/Console.cpp:222:(.text._ZN6il2cpp2os7Console20InternalKeyAvailableEi+0x2c): relocation truncated to fit: R_AARCH64_CALL26 against symbol `__FD_SET_chk@@LIBC' defined in .text section in E:/SDK/android-ndk-r21d/toolchains/llvm/prebuilt/windows-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/22/libc.so
E:/Unity\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\os\Posix/Console.cpp:226:(.text._ZN6il2cpp2os7Console20InternalKeyAvailableEi+0x3c): relocation truncated to fit: R_AARCH64_CALL26 against symbol `div@@LIBC' defined in .text section in E:/SDK/android-ndk-r21d/toolchains/llvm/prebuilt/windows-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/22/libc.so
E:/Unity\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\os\Posix/Console.cpp:236:(.text._ZN6il2cpp2os7Console20InternalKeyAvailableEi+0x68): relocation truncated to fit: R_AARCH64_CALL26 against symbol `select@@LIBC' defined in .text section in E:/SDK/android-ndk-r21d/toolchains/llvm/prebuilt/windows-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/22/libc.so
E:/Unity\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\os\Posix/Console.cpp:238:(.text._ZN6il2cpp2os7Console20InternalKeyAvailableEi+0x74): relocation truncated to fit: R_AARCH64_CALL26 against symbol `__errno@@LIBC' defined in .text section in E:/SDK/android-ndk-r21d/toolchains/llvm/prebuilt/windows-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/22/libc.so
E:/Unity\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\os\Posix/Console.cpp:244:(.text._ZN6il2cpp2os7Console20InternalKeyAvailableEi+0xa0): relocation truncated to fit: R_AARCH64_CALL26 against symbol `ioctl@@LIBC' defined in .text section in E:/SDK/android-ndk-r21d/toolchains/llvm/prebuilt/windows-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/22/libc.so
Library/Bee/artifacts/Android/87lik/03uo_osix1.lump.o: In function `il2cpp::os::Console::SetProperty(int, bool)':
E:/Unity\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\os\Posix/Console.cpp:50:(.text._ZN6il2cpp2os7ConsoleL11SetPropertyEib+0x28): relocation truncated to fit: R_AARCH64_CALL26 against symbol `tcgetattr@@LIBC' defined in .text section in E:/SDK/android-ndk-r21d/toolchains/llvm/prebuilt/windows-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/22/libc.so
E:/Unity\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\os\Posix/Console.cpp:66:(.text._ZN6il2cpp2os7ConsoleL11SetPropertyEib+0x68): relocation truncated to fit: R_AARCH64_CALL26 against symbol `tcsetattr@@LIBC' defined in .text section in E:/SDK/android-ndk-r21d/toolchains/llvm/prebuilt/windows-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/22/libc.so
E:/Unity\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\os\Posix/Console.cpp:(.text._ZN6il2cpp2os7ConsoleL11SetPropertyEib+0xb8): relocation truncated to fit: R_AARCH64_CALL26 against symbol `__stack_chk_fail@@LIBC' defined in .text section in E:/SDK/android-ndk-r21d/toolchains/llvm/prebuilt/windows-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/22/libc.so
Library/Bee/artifacts/Android/87lik/03uo_osix1.lump.o: In function `il2cpp::os::Console::TtySetup(std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char> > const&, unsigned char*, int**)':
E:/Unity\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\os\Posix/Console.cpp:287:(.text._ZN6il2cpp2os7Console8TtySetupERKNSt6__ndk112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEESA_PhPPi+0x40): relocation truncated to fit: R_AARCH64_CALL26 against symbol `getenv@@LIBC' defined in .text section in E:/SDK/android-ndk-r21d/toolchains/llvm/prebuilt/windows-x86_64/bin/../sysroot/usr/lib/aarch64-linux-android/22/libc.so
E:/Unity\2021.3.8f1\Editor\Data\il2cpp\libil2cpp\os\Posix/Console.cpp:290:(.text._ZN6il2cpp2os7Console8TtySetupERKNSt6__ndk112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEESA_PhPPi+0x48): additional relocation overflows omitted from the output
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

解决：

具体啥问题没搞清楚，连搜带蒙测试下来：

打包时关闭Develpment Build -> Script Debugging选项，就不会报错

参考文章：
Unity2020 il2cpp 代码多的情况下，直接打包出错，使用obb模式或导出到AndroidStudio工程再打apk没问题

3、Gradle工程编译APK缺少tools.jar

编译的命令：

java -classpath D:\Mole\RSUpgrade\PackageTool\Android\gradle-wrapper.jar org.gradle.wrapper.GradleWrapperMain aR -p .\UAProj64

报错：

> Task :unityLibrary:compileReleaseJavaWithJavac FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':unityLibrary:compileReleaseJavaWithJavac'.
> Could not find tools.jar. Please check that E:\SDK\jre1.8.0 contains a valid JDK installation.

解决：

问题原因是我本地的jre目录下，没有tools.jar这个包。
解决方式是把jdk1.8.0_171\lib\tools.jar拷贝到jre1.8.0\lib里面。
当然，这个解决方案其实有些奇怪。因为要手动修改安装好的环境。