Jam*_*ama 4 android opencv cross-compiling android-ndk
背景:我目前正在Android Studio上为Moverio BT 200增强现实眼镜开发应用程序.我正在使用OpenCV,特别是库的arUco模块.该模块必须与NDK一起使用.此外,它不在稳定版本上,所以我自己编译了库(使用本指南:https://zami0xzami.wordpress.com/2016/03/17/building-opencv-for-android-from-source/) .图书馆的建设进展顺利.之后,我做了一个android studio项目(customOCVtest).我在使用OpenCV与Android Studio和NDK时总是这样做,除了这次是使用自定义构建.我检查了库是否正确加载:
private static final String OCVdevTAG = "OCVmainAct";
static {
System.loadLibrary("native-lib");
if(!OpenCVLoader.initDebug()) {
Log.d(OCVdevTAG, "OpenCV not loaded");
} else {
Log.d(OCVdevTAG, "OpenCV loaded");
}
}
我构建时确实加载了库.
现在出现了问题:当我尝试在我的本机代码中实际使用arUco模块时(这是我的native-lib.cpp):
#include <jni.h>
#include <string>
#include <opencv2/aruco.hpp>
extern "C" {
jstring
Java_com_jambonsama_customocvtest_MainActivity_stringFromJNI(
JNIEnv *env,
jobject /* this */) {
std::string hello = "Hello from C++";
cv::Ptr<cv::aruco::Dictionary> dict = cv::aruco::getPredefinedDictionary(cv::aruco::DICT_6X6_250);
cv::Mat marker;
cv::aruco::drawMarker(dict, 25, 200, marker, 1);
return env->NewStringUTF(hello.c_str());
}
}
gradle sync工作,但我无法构建.我收到以下错误:
Error:FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:externalNativeBuildDebug'.
> Build command failed.
Error while executing 'C:\Users\JambonSama\AppData\Local\Android\Sdk\cmake\3.6.3155560\bin\cmake.exe' with arguments {--build C:\Users\JambonSama\AndroidStudioProjects\customOCVtest\app\.externalNativeBuild\cmake\debug\mips64 --target native-lib}
[1/1] Linking CXX shared library ..\..\..\..\build\intermediates\cmake\debug\obj\mips64\libnative-lib.so
FAILED: cmd.exe /C "cd . && C:\Users\JambonSama\AppData\Local\Android\sdk\ndk-bundle\toolchains\llvm\prebuilt\windows-x86_64\bin\clang++.exe -target mips64el-none-linux-android -gcc-toolchain C:/Users/JambonSama/AppData/Local/Android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/windows-x86_64 --sysroot=C:/Users/JambonSama/AppData/Local/Android/sdk/ndk-bundle/platforms/android-21/arch-mips64 -fPIC -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security -fno-exceptions -fno-rtti -O0 -fno-limit-debug-info -O0 -fno-limit-debug-info -Wl,--build-id -Wl,--warn-shared-textrel -Wl,--fatal-warnings -Wl,--no-undefined -Wl,-z,noexecstack -Qunused-arguments -Wl,-z,relro -Wl,-z,now -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,libnative-lib.so -o ..\..\..\..\build\intermediates\cmake\debug\obj\mips64\libnative-lib.so CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_core.a C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_aruco.a -llog -lm "C:/Users/JambonSama/AppData/Local/Android/sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/mips64/libgnustl_static.a" && cd ."
C:/Users/JambonSama/AppData/Local/Android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/windows-x86_64/lib/gcc/mips64el-linux-android/4.9.x/../../../../mips64el-linux-android/bin\ld: C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_core.a(alloc.cpp.o): Relocations in generic ELF (EM: 40)
C:/Users/JambonSama/AppData/Local/Android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/windows-x86_64/lib/gcc/mips64el-linux-android/4.9.x/../../../../mips64el-linux-android/bin\ld: C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_core.a(alloc.cpp.o): Relocations in generic ELF (EM: 40)
C:/Users/JambonSama/AppData/Local/Android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/windows-x86_64/lib/gcc/mips64el-linux-android/4.9.x/../../../../mips64el-linux-android/bin\ld: C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_core.a(alloc.cpp.o): Relocations in generic ELF (EM: 40)
C:/Users/JambonSama/AppData/Local/Android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/windows-x86_64/lib/gcc/mips64el-linux-android/4.9.x/../../../../mips64el-linux-android/bin\ld: C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_core.a(alloc.cpp.o): Relocations in generic ELF (EM: 40)
C:/Users/JambonSama/AppData/Local/Android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/windows-x86_64/lib/gcc/mips64el-linux-android/4.9.x/../../../../mips64el-linux-android/bin\ld: C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_core.a(alloc.cpp.o): Relocations in generic ELF (EM: 40)
C:/Users/JambonSama/AppData/Local/Android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/windows-x86_64/lib/gcc/mips64el-linux-android/4.9.x/../../../../mips64el-linux-android/bin\ld: C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_core.a(alloc.cpp.o): Relocations in generic ELF (EM: 40)
C:/Users/JambonSama/AppData/Local/Android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/windows-x86_64/lib/gcc/mips64el-linux-android/4.9.x/../../../../mips64el-linux-android/bin\ld: C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_core.a(alloc.cpp.o): Relocations in generic ELF (EM: 40)
C:/Users/JambonSama/AppData/Local/Android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/windows-x86_64/lib/gcc/mips64el-linux-android/4.9.x/../../../../mips64el-linux-android/bin\ld: C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_core.a(alloc.cpp.o): Relocations in generic ELF (EM: 40)
C:/Users/JambonSama/AppData/Local/Android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/windows-x86_64/lib/gcc/mips64el-linux-android/4.9.x/../../../../mips64el-linux-android/bin\ld: C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_core.a(alloc.cpp.o): Relocations in generic ELF (EM: 40)
C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_core.a: error adding symbols: File in wrong format
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
特别是,此错误消息告诉我,我尝试使用以下参数进行构建:
{--build C:\Users\JambonSama\AndroidStudioProjects\customOCVtest\app\.externalNativeBuild\cmake\debug\mips64 --target native-lib}
该参数由AS自动生成,我找不到传递它的文件.我相信,如果我能找到它,我可以为手臂(这是我想要的)而不是mips建造.问题是,我找不到它.(而且我甚至不确定那确实是我正在寻找的.我只是想让我的项目为我的眼镜而建.)
以下是我的CMakeLists.txt:
# Sets the minimum version of CMake required to build the native
# library. You should either keep the default value or only pass a
# value of 3.4.0 or lower.
cmake_minimum_required(VERSION 3.4.1)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds it for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
native-lib
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
# Associated headers in the same location as their source
# file are automatically included.
src/main/cpp/native-lib.cpp )
include_directories(C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/jni/include)
# Searches for a specified prebuilt library and stores the path as a
# variable. Because system libraries are included in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
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 )
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in the
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
native-lib
C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_core.a
C:/Libs/opencv_src/opencv/platforms/build_android_arm/install/sdk/native/libs/armeabi-v7a/libopencv_aruco.a
# Links the target library to the log library
# included in the NDK.
${log-lib} )
这是我的app build.gradle:
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25.0.1"
defaultConfig {
applicationId "com.jambonsama.customocvtest"
minSdkVersion 14
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
externalNativeBuild {
cmake {
cppFlags ""
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "CMakeLists.txt"
}
}
sourceSets { main { jni.srcDirs = ['src/main/jni', 'src/main/jniLibs/'] } }
}
dependencies {
compile fileTree(include: ['*.jar'], dir: 'libs')
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.0.1'
testCompile 'junit:junit:4.12'
compile project(':openCVLibrary310dev')
}
和我的openCVLibrary310dev build.gradle
apply plugin: 'com.android.library'
android {
compileSdkVersion 25
buildToolsVersion "23.0.2"
defaultConfig {
ndk {
abiFilter("armeabi-v7a")
}
minSdkVersion 14
targetSdkVersion 25
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
}
我尝试过的,主要是复制那些帮助其他人解决类似地雷问题的东西:
#set(CMAKE_SYSTEM_NAME Android)
要么
#set(CMAKE_TOOLCHAIN_FILE "Toolchain file" CACHE FILEPATH "C:/Libs/opencv_src/opencv/platforms/android.toolchain.cmake")
要么
#set( CMAKE_CXX_COMPILER "C:/Libs/android-ndk-r13b/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-g++.exe" )
在CMakeLists.txt中
和
splits {
abi {
enable true
reset()
include 'armeabi-v7a'
universalApk true
}
}
要么
tasks.getByPath(":app:linkMipsDebugRemoteDesktopSharedLibrary").enabled = false
在build.gradle中(我试过这两个因为我不知道哪一个应该有它).
除了最后一点代码(task.getByPath ...),同步工作,但我无法构建.对于最后一个,我甚至无法同步.
我也尝试为mips重建库,因为架构似乎是问题,但我不知道如何做到这一点.
我在哪里可以找到以下参数所在的文件:
{--build C:\Users\JambonSama\AndroidStudioProjects\customOCVtest\app\.externalNativeBuild\cmake\debug\mips64 --target native-lib}
建筑时通过？和/或如何让Android Studio构建我的arm架构项目？
所以mips架构问题可以通过在android块的末尾添加以下代码到app的gradle.build来解决:
productFlavors {
armv7 {
ndk {
abiFilter "armeabi-v7a"
}
}
fat
}
但随后出现了其他问题.值得注意的是,该库是使用Android Studio不喜欢的胡萝卜素选项构建的,然后,gzlib错过了,因此Android Studio无法构建和/或运行.经过多次试验,我终于实现了我的目标:在Windows上交叉编译openCV与Android的额外模块,并使用所述内置库构建AS项目以使其正常工作.我记录了我的整个过程,从下载openCV源代码直到在我的arm-architected设备上运行我的应用程序,我只是将它粘贴到这里,以便任何需要这样做的人.以下说明主要基于本教程(感谢编写它的Zamrath Nizam).该教程唯一的问题是它可能有点旧,所以需要改变一些选项/步骤.
*第一:先决条件*
*SECOND:配置CMake*
通过"搜索"字段更改以下附加选项:
验证是否正确设置了以下选项(通过"搜索"字段):
按'配置'
*第三:用mingw*编译
*第四个:android项目*
转到文件 - >新建 - >导入模块...
更改openCVLibraryXXX(导入模块)文件夹中build.gradle文件中的目标:
在openCVLibraryXXX(导入的模块)文件夹中的build.gradle文件中:
将导入的库作为依赖项添加到文件 - >'项目结构'中的'app'模块
在'app/src/main'中创建一个jniLibs文件夹:
将OpenCV的库从'opencv-source/platforms/android_arm/install/sdk/native/libs'复制到'AndroidStudioProjects/cOCV/app/src/main/jniLibs'文件夹中新创建的文件夹(jniLibs)中
在'opencv-contrib-source/modules/module_you_desperately_need/CMakeLists.txt'中,更改'ocv_define_module(module_you_desperately_need opencv opencv)以及'ocv_define_module(module_you_desperately_need opencv,其他一些模块WRAP java)'
在CMakeLists.txt中,添加:
'add_library'块之后和'find_library'块之前的以下两行:
include_directories(../opencv_src/opencv/platforms/build_android_armn/install/sdk/native/jni/include)
link_directories(../AndroidStudioProjects/cOCVn/app/src/main/jniLibs/armeabi-v7a)
'find_library'块之后和'target_link_libraries'块之后的以下行:
file(GLOB PARTYLIBS "../opencv_src/opencv/platforms/build_android_armn/install/sdk/native/3rdparty/libs/armeabi-v7a/*.a")
file(GLOB CVLIBS "../opencv_src/opencv/platforms/build_android_armn/install/sdk/native/libs/armeabi-v7a/*.a")
以下路径,AS WRITTEN,在'target_link_libraries'中,在'native-lib'变量之后,在'$ {log-lib}'变量之前:
${CVLIBS}
${PARTYLIBS}
${CVLIBS}
在app的gradle.build中,添加以下代码:
productFlavors {
armv7 {
ndk {
abiFilter "armeabi-v7a"
}
}
fat
}
在android块的末尾
在native-lib.cpp中:
在'stringFromJNI'函数中尝试以下代码(这个函数在创建项目时由AS自动生成)
cv::Mat test;
cv::VideoCapture camera;
camera.open(0);
cv::Ptrcv::aruco::Dictionary dict = cv::aruco::getPredefinedDictionary(cv::aruco::DICT_6X6_250);
cv::Mat marker;
cv::aruco::drawMarker(dict, 25, 200, marker, 1);
std::string hello = "Hello from C++";
return env-NewStringUTF(hello.c_str());
不要忘记以下内容包括:
#include jni.h
#include string
#include opencv2/aruco.hpp
#include opencv2/videoio.hpp
时间来测试:
你很高兴\ o \\ O // o /
补充说明 :
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