我创建了一个支持 C++ 的新 Android Studio 项目,但没有添加任何内容。该项目使用 CMake 构建、编译和运行。然后,我将以下两行代码添加到文件底部的 CMakeLists.txt
中,然后出现 CMake 构建错误。
find_package(Java COMPONENTS Development) # Line 47
find_package(JNI REQUIRED) # Line 48
这是我在构建项目时遇到的错误
-- Found Java: /usr/lib/jvm/java-10-oracle/bin/java (found version "10.0.1") found components: Development
-- Configuring incomplete, errors occurred!
CMake Error at /home/xxxxx/Android/Sdk/cmake/3.6.4111459/share/cmake-3.6/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY
See also "/home/xxxxx/AndroidStudioProjects/MyApplication/app/.externalNativeBuild/cmake/release/x86_64/CMakeFiles/CMakeOutput.log".
JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)
Call Stack (most recent call first):
/home/xxxxxx/Android/Sdk/cmake/3.6.4111459/share/cmake-3.6/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE)
/home/xxxxxx/Android/Sdk/cmake/3.6.4111459/share/cmake-3.6/Modules/FindJNI.cmake:314 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
CMakeLists.txt:48 (find_package)
External native generate JSON release: JSON generation completed with problems
CMake 在从命令行调用时运行,但由于某种原因在 Android Studio 中失败,我不知道为什么。
编辑 1
这是 CMakeOutput.log 文件
编辑 2
这就是 CMakeLists.txt
文件中的全部内容。它使用命令 cmake 在 cmd 中编译。
cmake_minimum_required(VERSION 3.4.1)
find_package(Java COMPONENTS Development)
find_package(JNI REQUIRED)
这是cmd输出
E:\Users\xxxxx\AndroidStudioProjects\MyApplication\app\build>cmake ..
-- Configuring done
-- Generating done
-- Build files have been written to: E:/Users/xxxxx/AndroidStudioProjects/MyApplication/app/build
当我尝试使用 gradle 在 Android Studio 中添加它时,我在 Windows 10 pro 64 位上收到以下错误
Microsoft Windows [Version 10.0.17134.112]
(c) 2018 Microsoft Corporation. All rights reserved.
E:\Users\xxxxx\AndroidStudioProjects\MyApplication>gradlew build --stacktrace
> Task :app:generateJsonModelDebug
External native generate JSON debug: starting JSON generation
External native generate JSON debug: using platform version 24 for ABI ARMEABI_V7A and min SDK version 24
External native generate JSON debug: noticing that build file 'E:\Users\xxxxx\AndroidStudioProjects\MyApplication\app\CMakeLists.txt' is out of date with respect to E:\Users\xxxxx\AndroidStudioProjects\MyApplication\app\.extern
alNativeBuild\cmake\debug\armeabi-v7a\android_gradle_build.json
External native generate JSON debug: rebuilding JSON E:\Users\xxxxx\AndroidStudioProjects\MyApplication\app\.externalNativeBuild\cmake\debug\armeabi-v7a\android_gradle_build.json due to:
External native generate JSON debug: - a dependent build file changed
External native generate JSON debug: keeping json folder 'E:\Users\xxxxx\AndroidStudioProjects\MyApplication\app\.externalNativeBuild\cmake\debug\armeabi-v7a' but regenerating project
External native generate JSON debug: executing cmake Executable : E:\Android\SDK\cmake\3.6.4111459\bin\cmake.exe
arguments :
-HE:\Users\xxxxx\AndroidStudioProjects\MyApplication\app
-BE:\Users\xxxxx\AndroidStudioProjects\MyApplication\app\.externalNativeBuild\cmake\debug\armeabi-v7a
-DANDROID_ABI=armeabi-v7a
-DANDROID_PLATFORM=android-24
-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=E:\Users\xxxxx\AndroidStudioProjects\MyApplication\app\build\intermediates\cmake\debug\obj\armeabi-v7a
-DCMAKE_BUILD_TYPE=Debug
-DANDROID_NDK=E:\Android\SDK\ndk-bundle
-DCMAKE_CXX_FLAGS=
-DCMAKE_TOOLCHAIN_FILE=E:\Android\SDK\ndk-bundle\build\cmake\android.toolchain.cmake
-DCMAKE_MAKE_PROGRAM=E:\Android\SDK\cmake\3.6.4111459\bin\ninja.exe
-GAndroid Gradle - Ninja
jvmArgs :
CMake Error at E:/Android/SDK/cmake/3.6.4111459/share/cmake-3.6/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY
JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)
Call Stack (most recent call first):
E:/Android/SDK/cmake/3.6.4111459/share/cmake-3.6/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE)
E:/Android/SDK/cmake/3.6.4111459/share/cmake-3.6/Modules/FindJNI.cmake:314 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
CMakeLists.txt:4 (find_package)
-- Configuring incomplete, errors occurred!
See also "E:/Users/xxxxx/AndroidStudioProjects/MyApplication/app/.externalNativeBuild/cmake/debug/armeabi-v7a/CMakeFiles/CMakeOutput.log".
原文由 master4709 发布,翻译遵循 CC BY-SA 4.0 许可协议
正如与 Android 捆绑的 CMake 版本试图告诉您的那样,它找不到 JNI 包,因为缺少某些部分:
检查 FindJNI 的文档( https://cmake.org/cmake/help/latest/module/FindJNI.html )这些变量设置为 Android 版本的 JNI 未附带的库和标头的位置(不足为奇,例如,Android 不包含 AWT 库)。运行
find_package(JNI REQUIRED)
时,FindJNI 代码检查是否设置了这些变量,如果没有设置,则发出错误。一种解决方法是在调用
find_package
之前自己设置这些变量:但请注意,您的代码将只能使用 jni.h 及其功能:如果它尝试访问 JNI 包的任何其他部分,它将失败(可能在编译时),因为本质上,您已经欺骗了 CMake找到了整个包,而实际上只有一部分存在于 Android 设置中。