android 宏替换_Android Studio：如何在build.gradle中定义自定义宏（针对不同的构建变体），并让本机C / C ++代码检测到它们？...

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#android 宏替换

本文介绍了如何在Android Studio的build.gradle文件中为不同构建变体（debug、release、demo_ver、full_ver）定义自定义宏，并确保C/C++代码能够检测到这些宏。在尝试使用`cmake`方法时遇到了错误，最终解决方案是在`externalNativeBuild`块内设置`cppFlags`，从而正确传递预处理器宏给C/C++编译器。

I need to define some custom macros such as "DEBUG", "RELEASE", "DEMO_VER" and "FULL_VER" in Android Studio build.gradle file so that my C/C++ code can detect them like:

#ifdef DEBUG

...

#else //RELEASE

...

#endif

#ifdef DEMO_VER

...

#else //FULL_VER

...

#endif

My understanding is that these macros should be defined as g++ compiler options in the build variant blocks like the following code:

buildTypes

{

release

{

cmake <<====== Error!!!!!: could not find method cmake() for ...BuildType

{

cppFlags += "-DRELEASE"

}

debug

{

cmake <<====== Error!!!!!: could not find method cmake() for ...BuildType

{

cppFlags += "-DDEBUG"

}

flavorDimensions "version"

productFlavors

{

demo

{

cmake <<====== Error!!!!!: could not find method cmake() for ...ProductFlavor

{

cppFlags += "-DEMO_VER"

}

full

{

cmake <<====== Error!!!!!: could not find method cmake() for ...ProductFlavor

{

cppFlags += "-DFULL_VER"

}

The problem is that I can not use "cmake" inside either "BuildType" nor "ProductFlavor", the method can not be found.

So what is the correct way to pass in compiler macros for different product flavors / build types?

解决方案

Found answer myself: The "cmake" method belongs to class "externalNativeBuild" class, therefore it needs to be embedded inside "externalNativeBuild" block, like this:

release

{

externalNativeBuild

{

cmake

{

cppFlags += "-DRELEASE"

}

...

}

Now all the preprocessors defined in build.gradle are passed into the C/C++ compiler.