安卓打包sdk_android不再支持ndk

NDK环境

NDK环境下载，在AS上安装或者官网
然后配置系统环境变量，如：D:\AS\ndk\21.0.;
最好官网下，经过多个版本的测试，最终能解决我问题的还是r16，可是我这两天用方式一也试了r16，搞半天还是不行，周末一搞就OK了，这是天意？！！！NONONO，记得相应的配置的要Sync。
还有一些c++的标准库NDK编译就是有这样那样的兼容问题，不是缺这个就是缺那，即使将header file copy 过去了，还是会有这样那样不符合规范的问题。比如io.h，filesystem，direct.h，fstream 就是不支持能拿它怎样，天真以为2020了，也该…我试错试了很久才晓得。好多c++实现起来就费劲，实现完了发现还不能迁移。

打包so

方式一 ndk-build

1.新建project

2.Java目录下新建JNI.java，build一下，在app/src/main的路径下新建目录jni目录，编译的class ：F:\xxxxx\app\build\intermediates\javac\debug\classes\com\example\hete

package com.example.hell; public class MyJni { static { System.loadLibrary("MyJni"); } public native static String getString(); } 

3.在jni目录下生成相应的头文件com_example_hete_Heterotropia.h，

javah -jni -classpath F:\xxxxx\app\build\intermediates\javac\debug\classes com.example.hete.Heterotropia

4.然后jni目录下新建cpp源文件，改文件即为接口实现文件格式如：

JNIEXPORT jstring JNICALL Java_com_example_hell_MyJni_getString (JNIEnv *env, jclass jz){ return (env)->NewStringUTF("this is the first time for me to use jni"); } 

5.Jni目录下新建Android.mk

LOCAL_PATH:= $(call my-dir) $(info, $(LOCAL_PATH)) # ====================================== # 加载libOpenCV # ====================================== OPENCV_INSTALL_MODULES:=on OPENCV_CAMERA_MODULES:=on OPENCV_LIB_TYPE:=SHARED include D:\opencv-3.4.6-android-sdk\OpenCV-android-sdk\sdk\native\jni\OpenCV.mk #include $(CLEAR_VARS) LOCAL_MODULE := Heterotropia LOCAL_C_INCLUDES += D:\opencv-3.4.6-android-sdk\OpenCV-android-sdk\sdk\native\jni\include LOCAL_C_INCLUDES += D:\opencv-3.4.6-android-sdk\OpenCV-android-sdk\sdk\native\jni\include\opencv LOCAL_C_INCLUDES += D:\opencv-3.4.6-android-sdk\OpenCV-android-sdk\sdk\native\jni\include\opencv2 LOCAL_SRC_FILES += Heterotropia.cpp LOCAL_C_INCLUDES += $(LOCAL_PATH) #LOCAL_CFLAGS += -fPIC -pie -fPIE -Wno-deprecated-declarations LOCAL_LDLIBS += -ldl -llog #LOCAL_ALLOW_UNDEFINED_SYMBOLS := true include $(BUILD_SHARED_LIBRARY) 

6.Jni 目录下新建 Application.mk

#APP_PLATFORM := android-22 APP_ABI := all #APP_ABI := arm64-v8a APP_STL:= gnustl_static #APP_STL := c++_shared APP_CPPFLAGS := -std=c++11 -frtti -fexceptions 

7.然后在jni目录下ndk-build，没错误的情况下就能生成so了。

方式二 Android studio Cmake

前面步骤跟NKD差不多，只不过需要将之前jni目录下的.cpp放在…\app\src\main\cpp目录下。然后在CmakeLists.txt里配置相应的东西。（具体以后再补充）
SDK直接Android studio 下载的
NKD配置：官网下载ndk-r16在local.properties

sdk.dir=D\:\\AS\\sdk ndk.dir=D\:\\AS\\android-ndk-r16b-windows-x86_64\\android-ndk-r16b 

CmakeLists.txt

cmake_minimum_required(VERSION 3.4.1) set(pathToOpenCV D:/opencv-3.4.6-android-sdk/OpenCV-android-sdk) include_directories(${pathToOpenCV}/sdk/native/jni/include) add_library(lib_opencv SHARED IMPORTED) add_library(lib-handdev SHARED IMPORTED) set_target_properties(lib_opencv PROPERTIES IMPORTED_LOCATION ${pathToOpenCV}/sdk/native/libs/${ANDROID_ABI}/libopencv_java3.so) set_target_properties(lib-handdev PROPERTIES IMPORTED_LOCATION ${PROJECT_SOURCE_DIR}/../../../libs/${ANDROID_ABI}/libhanddev_algorithms.so) include_directories(${CMAKE_CURRENT_SOURCE_DIR}) add_library( # Sets the name of the library. # native-lib Heterotropia # Sets the library as a shared library. SHARED # Provides a relative path to your source file(s). # native-lib.cpp Heterotropia.cpp) find_library( # Sets the name of the path variable. log-lib # Specifies the name of the NDK library that # you want CMake to locate. log) target_link_libraries( # Specifies the target library. # native-lib Heterotropia # Links the target library to the log library # included in the NDK. lib_opencv # lib-handdev ${log-lib}) 

配置APP中的build.gradle

 testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" externalNativeBuild { cmake { // cppFlags "" // cppFlags "-std=c++11 -frtti -fexceptions" // arguments '-DANDROID_STL=c++_shared' cppFlags "-std=c++11 -frtti -fexceptions" abiFilters 'arm64-v8a','armeabi-v7a', 'x86', 'x86_64' arguments "-DANDROID_STL=gnustl_static" } ndk { // Specifies the ABI configurations of your native // libraries Gradle should build and package with your APK. // abiFilters 'armeabi-v7a', 'x86' abiFilters 'arm64-v8a','armeabi-v7a', 'x86', 'x86_64' stl = "gnustl_static" } } 

如上配置后，build下就可以在目录app\build\intermediates\cmake\debug\obj
下看到不同生成的so

方式三 引入第三方静态库目录

其他步骤与前面相同
这里需要引入的是开源库 wavelib目录

根目录的CMakeLists.txt
需要添加如下：
ADD_SUBDIRECTORY(${CMAKE_SOURCE_DIR}/wavelib)

target_link_libraries(
oct
wavelib
${log-lib})

#cpp/CMakeLists.txt cmake_minimum_required(VERSION 3.4.1) ADD_SUBDIRECTORY(${CMAKE_SOURCE_DIR}/wavelib) add_library( # Sets the name of the library. oct # Sets the library as a shared library. SHARED # Provides a relative path to your source file(s). oct.cpp ) find_library( # Sets the name of the path variable. log-lib # Specifies the name of the NDK library that # you want CMake to locate. log) target_link_libraries( # Specifies the target library. oct wavelib # Links the target library to the log library # included in the NDK. ${log-lib}) 

子目录wavelib的CMakeLists.txt

#cpp/wavelib/CMakeLists.txt include_directories(${CMAKE_CURRENT_SOURCE_DIR}) set(SOURCE_FILES conv.c cwt.c cwtmath.c hsfft.c real.c wavefilt.c wavefunc.c wavelib.c wtmath.c ) set(HEADER_FILES conv.h cwt.h cwtmath.h hsfft.h real.h wavefilt.h wavefunc.h wtmath.h ) add_library(wavelib STATIC ${SOURCE_FILES} ${HEADER_FILES}) set_property(TARGET wavelib PROPERTY FOLDER "lib") target_include_directories(wavelib PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}../header) target_link_libraries(wavelib ${log-lib} )###### 

在这里记录下生成静态 .a 的CMakeLists.txt

cmake_minimum_required(VERSION 3.4.1) ################################# ## 项目信息 ##project (as_oct) ## 查找当前目录下的所有源文件 ## 并将名称保存到 DIR_SRCS 变量 #aux_source_directory(. DIR_SRCS) ## 添加头文件路径 #include_directories(./wavelib) ## 添加 math 子目录 #add_subdirectory(wavelib) ## 指定生成目标 #add_executable(as_oct dwt.cpp) ## 添加链接库 ##target_link_libraries(as_oct dwt) ################################## #include_directories(${CMAKE_SOURCE_DIR}/src/main/cpp) #set(jnilibs "${CMAKE_SOURCE_DIR}/src/main/jniLibs") #set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${jnilibs}/${ANDROID_ABI}) #set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -pthread -DMGULK_LOG_STDERR=1 -Wall -Wextra -Wnon-virtual-dtor -g") #ADD_SUBDIRECTORY(${CMAKE_SOURCE_DIR}/wavelib) ################################### # 引入 .a 文件 add_library(wavelib STATIC IMPORTED ) set_target_properties(wavelib PROPERTIES IMPORTED_LOCATION "F:/xxxxxt/app/build/intermediates/cmake/debug/obj/${ANDROID_ABI}/libwavelib.a") ################################### #include_directories(${CMAKE_SOURCE_DIR}/wavelib) #ADD_SUBDIRECTORY(${CMAKE_SOURCE_DIR}/wavelib) ################################### add_library( # Sets the name of the library. oct # Sets the library as a shared library. SHARED # Provides a relative path to your source file(s). oct.cpp ) find_library( # Sets the name of the path variable. log-lib # Specifies the name of the NDK library that # you want CMake to locate. log) target_link_libraries( # Specifies the target library. oct wavelib # Links the target library to the log library # included in the NDK. ${log-lib}) 

Issure：

1.打包的so有问题 undefined reference to
cv::CascadeClassifier::detectMultiScale(cv::_InputArray const&, std::__ndk1::vector<cv::Rect_<int>, std::__ndk1::allocator<cv::Rect_<int> > >&, double, int, int, cv::Size_<int>, cv::Size_<int>)' LOCAL_ALLOW_UNDEFINED_SYMBOLS := true屏蔽掉没有定义的问题， 没有正面解决undefined reference tocv::CascadeClassifier::detectMultiScale，
java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol “ZN2cv17CascadeClassifier16detectMultiScaleERKNS_11_InputArrayERNSt6__ndk16vectorINS_5Rect_IiEENS4_9allocatorIS7_EEEEdiiNS_5Size_IiEESD” referenced by “/data/app/com.eyetext-RHXAwIq3io7ECCIZsowX0g==/lib/arm64/libHeterotropia.so”…
at java.lang.Runtime.loadLibrary0(Runtime.java:1071)
at java.lang.Runtime.loadLibrary0(Runtime.java:1007)

S：
1.Emphasis ndk版本问题，还是要r16的
2.将APP_STL := c++_shared 换成APP_STL:= gnustl_static（新版的只支持c++_static和c++_shared）

I2.没有添加APP_CPPFLAGS := -std=c++11
In file included from D:/AS/android-ndk-r16b-windows-x86_64/android-ndk-r16b/build//…/sources/cxx-stl/gnu-libstdc++/4.9/include\regex:35:
D:/AS/android-ndk-r16b-windows-x86_64/android-ndk-r16b/build//…/sources/cxx-stl/gnu-libstdc++/4.9/include\bits/c++0x_warning.h:32:2: error:
This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently
experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
#error This file requires compiler and library support for the \

S：
在Application.mk里设置：

APP_CPPFLAGS := -std=c++11 -frtti -fexceptions 

I3.Build command failed.
Error while executing process D:\AS\sdk\cmake\3.10.2.\bin\ninja.exe with arguments {-C F:\xxxxx\app.cxx\cmake\debug\arm64-v8a oct}
ninja: Entering directory F:\xxxxx\app\.cxx\cmake\debug\arm64-v8a' [1/1] Linking CXX shared library F:\xxxxx\app\build\intermediates\cmake\debug\obj\arm64-v8a\liboct.so FAILED: F:/xxxxxt/app/build/intermediates/cmake/debug/obj/arm64-v8a/liboct.so cmd.exe /C "cd . && D:\AS\android-ndk-r16b-windows-x86_64\android-ndk-r16b\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe --target=aarch64-none-linux-android --gcc-toolchain=D:/AS/android-ndk-r16b-windows-x86_64/android-ndk-r16b/toolchains/aarch64-linux-android-4.9/prebuilt/windows-x86_64 --sysroot=D:/AS/android-ndk-r16b-windows-x86_64/android-ndk-r16b/sysroot -fPIC -isystem D:/AS/android-ndk-r16b-windows-x86_64/android-ndk-r16b/sysroot/usr/include/aarch64-linux-android -D__ANDROID_API__=21 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -std=c++11 -frtti -fexceptions -O0 -fno-limit-debug-info -Wl,--exclude-libs,libgcc.a -Wl,--exclude-libs,libatomic.a --sysroot D:/AS/android-ndk-r16b-windows-x86_64/android-ndk-r16b/platforms/android-21/arch-arm64 -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -shared -Wl,-soname,liboct.so -o F:\xxxxx\app\build\intermediates\cmake\debug\obj\arm64-v8a\liboct.so CMakeFiles/oct.dir/oct.cpp.o wavelib/libwavelib.a -llog -latomic -lm "D:/AS/android-ndk-r16b-windows-x86_64/android-ndk-r16b/sources/cxx-stl/gnu-libstdc++/4.9/libs/arm64-v8a/libgnustl_static.a" && cd ." D:/AS/android-ndk-r16b-windows-x86_64/android-ndk-r16b/toolchains/aarch64-linux-android-4.9/prebuilt/windows-x86_64/lib/gcc/aarch64-linux-android/4.9.x\libgcc.a(unwind-dw2-fde-dip.o): In function_Unwind_Find_FDE’:
/usr/local/google/buildbot/src/android/gcc/toolchain/build/…/gcc/gcc-4.9/libgcc/unwind-dw2-fde-dip.c:461: undefined reference to `dl_iterate_phdr’
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

S:不兼容ABI架构arm64-v8a，build.gradle设置去掉

‘arm64-v8a’

externalNativeBuild { cmake { cppFlags "-std=c++11 -frtti -fexceptions" abiFilters'armeabi-v7a', 'x86', 'x86_64' arguments "-DANDROID_STL=gnustl_static" } 

I4.CMake was unable to find a build program
CMake Error: CMake was unable to find a build program corresponding to “Ninja”. CMAKE_MAKE_PROGRAM is not set. You probably need to select a different build tool.
S：cmake的版本不匹配，根据CmakeList.txt 要求在build.gradle 和gradle.properties设置：

//build.gradle externalNativeBuild { cmake { path "src/main/cpp/CMakeLists.txt" version "3.10.2" } } 

//gradle.properties cmake.dir=D\:\\application\\Android_SDK\\SDK\\cmake\\3.10.2. 

I5.compileDebugJavaWithJavac FAILED
project structure JDK 用Android studio\jre

参考
兼容性问题https://blog.csdn.net/weixin_/article/details/
Opencv问题
https://answers.opencv.org/questions/scope:all/sort:activity-desc/page:1/query:undefined%20reference%20to/
https://github.com/opencv/opencv/issues
NDK问题
https://github.com/android/ndk/issues
引入第三方目录
https://www.cnblogs.com/wuchaodzxx/p/8916009.html
https://www.jianshu.com/p/963db8ceecda
https://blog.csdn.net/s/article/details/
https://www.cnblogs.com/fnlingnzb-learner/p/7593488.html
https://blog.csdn.net/weixin_/article/details/
cmake问题
https://blog.csdn.net/oncealong/article/details/
https://blog.csdn.net/_/article/details/

今天的文章
安卓打包sdk_android不再支持ndk分享到此就结束了，感谢您的阅读。