最近在学习 cmake  就是在安卓中 , 麻烦的要死 , 看了很多的教程 , 发现没有 多少说对打印位置在哪里 , 先说一下版本信息 , 可能你们也不一样 

gradle  配置 

apply plugin: 'com.android.application'android {compileSdkVersion 29buildToolsVersion "29.0.3"defaultConfig {applicationId "com.learn.test"minSdkVersion 25targetSdkVersion 29versionCode 1versionName "1.0"testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"externalNativeBuild {cmake {cppFlags ''abiFilters  'arm64-v8a' , 'x86'}}ndk{// 打包生成的 APK 文件指挥包含 ARM 指令集的动态库abiFilters  'arm64-v8a' , 'x86'//不同平台so/*, "arm64-v8a", "x86", "x86_64"*/}}buildTypes {release {minifyEnabled falseproguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'}}externalNativeBuild {cmake {path file('src/main/cpp/CMakeLists.txt')version '3.22.1'}}}dependencies {implementation fileTree(dir: "libs", include: ["*.jar"])implementation 'androidx.appcompat:appcompat:1.1.0'implementation 'androidx.constraintlayout:constraintlayout:1.1.3'testImplementation 'junit:junit:4.12'androidTestImplementation 'androidx.test.ext:junit:1.1.1'androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'}

重点 CMakeLists.txt 配置 

cmake_minimum_required(VERSION 3.22.1)# 获取 Android 项目的根目录
set(ANDROID_PROJECT_ROOT ${CMAKE_SOURCE_DIR})# 使用根目录构建路径
set(ANDROID_LIB_DIR ${ANDROID_PROJECT_ROOT}/app/src/main/jniLibs/${ANDROID_ABI})# 输出路径
message("Android Project Root: ${ANDROID_PROJECT_ROOT}")
message("Android Lib Directory: ${ANDROID_LIB_DIR}")# 设置 Android NDK 的路径
set(ANDROID_NDK  /DevelopmentTool/Sdk/ndk/21.0.6113669)

这个就是一个简单打印 问题是打印内容在哪里?  找了很久终于找到位置了 

app/build/intermediates/cxx/Debug/c1z1m6iy/meta/x86/metadata_generation_stderr.txt

你就说这玩意儿有多垃圾 , 

metadata_generation_stderr.txt  名字居然是这个 

CMake Warning (dev) in CMakeLists.txt:No project() command is present.  The top-level CMakeLists.txt file mustcontain a literal, direct call to the project() command.  Add a line ofcode such asproject(ProjectName)near the top of the file, but after cmake_minimum_required().CMake is pretending there is a "project(Project)" command on the firstline.
This warning is for project developers.  Use -Wno-dev to suppress it.Android Project Root: D:/Androidstudioproject/MyApplication2/app/src/main/cpp
Android Lib Directory: D:/Androidstudioproject/MyApplication2/app/src/main/cpp/app/src/main/jniLibs/x86
CMake Warning:Manually-specified variables were not used by the project:CMAKE_EXPORT_COMPILE_COMMANDSCMAKE_LIBRARY_OUTPUT_DIRECTORYCMAKE_RUNTIME_OUTPUT_DIRECTORY

这里面就是 message 输出的内容 , 真的很垃圾 

目前并不知道拿到路径方式 只能采用这种方式 , 你们可以在网上打印

# 获取 Android 项目的根目录（相对于 CMakeLists.txt 所在目录）
get_filename_component(ANDROID_PROJECT_ROOT ${CMAKE_CURRENT_LIST_DIR}/../../.. REALPATH)# 构建相对路径
set(RELATIVE_PATH src/main/java/com/learn/test)# 构建完整路径
set(JAVA_SOURCE_DIR ${ANDROID_PROJECT_ROOT}/${RELATIVE_PATH})# 在这里可以使用 JAVA_SOURCE_DIR 变量来设置路径
message("Java Source Directory: ${JAVA_SOURCE_DIR}")