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我是Android新手，所以我不完全了解如何制作Android.mk文件。 我的项目运行正常，在线提供了Android.mk的教程。但后来我需要添加一个缺失的库，并且该教程有另一个Android.mk，现在我试图将它们合并在一起。如何在添加库时合并两个Android.mk文件？
这里是我的Android.mk：
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
#opencv
OPENCVROOT:= C:\OpenCV-2.4.10-android-sdk
OPENCV_CAMERA_MODULES:=on
OPENCV_INSTALL_MODULES:=on
OPENCV_LIB_TYPE:=SHARED
include ${OPENCVROOT}/sdk/native/jni/OpenCV.mk
LOCAL_SRC_FILES := com_example_adrien_ndkopencvtest4_OpencvNativeClass.cpp
LOCAL_LDLIBS += -llog
LOCAL_MODULE := MyOpencvLibs
include $(BUILD_SHARED_LIBRARY)
这里是Android.mk我需要添加：
LOCAL_PATH := $(call my-dir)
OPENCV_PATH := D:/CODE/OpenCV-2.4.10-android-sdk/sdk/native/jni
include $(CLEAR_VARS)
LOCAL_MODULE := nonfree
LOCAL_SRC_FILES := libnonfree.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
OPENCV_INSTALL_MODULES := on
OPENCV_CAMERA_MODULES := off
include $(OPENCV_PATH)/OpenCV.mk
LOCAL_C_INCLUDES := \
$(LOCAL_PATH) \
$(OPENCV_PATH)/include
LOCAL_SRC_FILES := \
nonfree_jni.cpp
LOCAL_MODULE := nonfree_demo
LOCAL_CFLAGS := -Werror -O3 -ffast-math
LOCAL_LDLIBS := -llog -ldl
LOCAL_SHARED_LIBRARIES += nonfree
include $(BUILD_SHARED_LIBRARY)
我感兴趣的东西，在过去的Android .mk只是libnonfree.so，我不需要cpp文件。
这里是我的项目的结构：
编辑：
谢谢您的回答。我已经做了什么建议和我的Android.mk看起来像这样：
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
#opencv
OPENCVROOT:= C:\OpenCV-2.4.10-android-sdk
OPENCV_CAMERA_MODULES:=on
OPENCV_INSTALL_MODULES:=on
OPENCV_LIB_TYPE:=SHARED
include ${OPENCVROOT}/sdk/native/jni/OpenCV.mk
LOCAL_SRC_FILES := com_example_adrien_ndkopencvtest4_OpencvNativeClass.cpp
LOCAL_LDLIBS += -llog
LOCAL_SHARED_LIBRARIES += nonfree
LOCAL_MODULE := MyOpencvLibs
include $(BUILD_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := nonfree
LOCAL_SRC_FILES := libnonfree.so
include $(PREBUILT_SHARED_LIBRARY)
但问题依然存在。我有“未定义的参考”方法libnonfree.so应该添加。我认为问题来自Android.mk，但也许是从其他地方。
我添加System.loadLibrary("nonfree");我MainACtivity和
#include "opencv2/nonfree/nonfree.hpp"
#include "opencv2/nonfree/features2d.hpp"
我不知道我做错了。
编辑2：
以下是错误：
Application.mk：
APP_STL := gnustl_static
APP_CPPFLAGS := -frtti -fexceptions
APP_ABI := armeabi-v7a
APP_PLATFORM := android-16
我不知道在哪里设置arguments="V=1"在我的build.gradle
我的建设。的gradle：
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
applicationId "com.example.adrien.ndkopencvtest4"
minSdkVersion 15
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
sourceSets.main {
//jniLibs.srcDirs = ['src/main/jniLibs']
jni.srcDirs = [] //disable automatic ndk-build call
}
task ndkBuild(type: Exec, description: 'Compile JNI source via NDK') {
commandLine "C:/Users/Adrien/AppData/Local/Android/sdk/ndk-bundle/ndk-build.cmd",
'NDK_PROJECT_PATH=build/intermediates/ndk',
'NDK_LIBS_OUT=src/main/jniLibs',
'APP_BUILD_SCRIPT=src/main/jni/Android.mk',
'NDK_APPLICATION_MK=src/main/jni/Application.mk'
}
tasks.withType(JavaCompile) {
compileTask -> compileTask.dependsOn ndkBuild
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
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.github.wseemann:FFmpegMediaMetadataRetriever-armeabi-v7a:1.0.14'
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
compile project(':openCVLibrary2410')
}
EDIT 3： “NDK建造V = 1” 的
结果：
C:\Users\Adrien\AndroidStudioProjects\NDKOpencvTest4\app\src\main\jni>ndk-build V=1
[armeabi-v7a] SharedLibrary : libMyOpencvLibs.so
C:/Users/Adrien/AppData/Local/Android/sdk/ndk-bundle/build//../toolchains/llvm/preb
uilt/windows-x86_64/bin/clang++.exe -Wl,-soname,libMyOpencvLibs.so -shared --sysroo
t=C:/Users/Adrien/AppData/Local/Android/sdk/ndk-bundle/build//../platforms/android-
16/arch-arm C:/Users/Adrien/AndroidStudioProjects/NDKOpencvTest4/app/src/main/obj/l
ocal/armeabi-v7a/objs/MyOpencvLibs/com_example_adrien_ndkopencvtest4_OpencvNativeCl
ass.o C:/Users/Adrien/AppData/Local/Android/sdk/ndk-bundle/build//../sources/cxx-st
l/gnu-libstdc++/4.9/libs/armeabi-v7a/libgnustl_static.a -lgcc C:/Users/Adrien/Andro
idStudioProjects/NDKOpencvTest4/app/src/main/obj/local/armeabi-v7a/libopencv_java.s
o C:/Users/Adrien/AndroidStudioProjects/NDKOpencvTest4/app/src/main/obj/local/armea
bi-v7a/libnonfree.so -gcc-toolchain C:/Users/Adrien/AppData/Local/Android/sdk/ndk-
bundle/build//../toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64 -no-c
anonical-prefixes -target armv7-none-linux-androideabi -Wl,--fix-cortex-a8 -Wl,--b
uild-id -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -Wl,--warn-sh
ared-textrel -Wl,--fatal-warnings -LC:/Users/Adrien/AppData/Local/Android/sdk/ndk
-bundle/build//../platforms/android-16/arch-arm/usr/lib -llog -lc -lm -o C:/Users/A
drien/AndroidStudioProjects/NDKOpencvTest4/app/src/main/obj/local/armeabi-v7a/libMy
OpencvLibs.so
C:/Users/Adrien/AndroidStudioProjects/NDKOpencvTest4/app/src/main/jni/com_example_a
drien_ndkopencvtest4_OpencvNativeClass.cpp:214: error: undefined reference to 'cv::
SURF::SURF(double, int, int, bool, bool)'
C:/Users/Adrien/AndroidStudioProjects/NDKOpencvTest4/app/src/main/jni/com_example_a
drien_ndkopencvtest4_OpencvNativeClass.cpp:222: error: undefined reference to 'cv::
SURF::SURF()'
C:/Users/Adrien/AndroidStudioProjects/NDKOpencvTest4/app/src/main/jni/com_example_a
drien_ndkopencvtest4_OpencvNativeClass.cpp:204: error: undefined reference to 'VTT
for cv::SURF'
C:/Users/Adrien/AndroidStudioProjects/NDKOpencvTest4/app/src/main/jni/com_example_a
drien_ndkopencvtest4_OpencvNativeClass.cpp:204: error: undefined reference to 'VTT
for cv::SURF'
C:/Users/Adrien/AndroidStudioProjects/NDKOpencvTest4/app/src/main/jni/com_example_a
C:/Users/Adrien/AndroidStudioProjects/NDKOpencvTest4/app/src/main/jni/com_example_adrien_ndkopencvtest4_OpencvNativeClass.cpp:204: error: undefined
reference to 'VTT for cv::SURF'
C:/Users/Adrien/AndroidStudioProjects/NDKOpencvTest4/app/src/main/jni/com_example_adrien_ndkopencvtest4_OpencvNativeClass.cpp:449: error: undefined
reference to 'cv::SURF::SURF(double, int, int, bool, bool)'
C:/Users/Adrien/AndroidStudioProjects/NDKOpencvTest4/app/src/main/jni/com_example_adrien_ndkopencvtest4_OpencvNativeClass.cpp:457: error: undefined
reference to 'cv::SURF::SURF()'
clang++.exe: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [C:/Users/Adrien/AndroidStudioProjects/NDKOpencvTest4/app/src/main/obj/local/armeabi-v7a/libMyOpencvLibs.so] Error 1
SOLUTION：
我libnonfree。所以文件不正确，我下载了一个另一个。我也改变了我的Application.mk文件：
APP_STL := gnustl_static
APP_CPPFLAGS := -frtti -fexceptions
APP_ABI := armeabi-v7a
APP_PLATFORM := android-16
请显示您看到的错误。为了理解你的** Android.mk **是如何解释的，从命令行运行'ndk-build V = 1'（或者你可以在** build.gradle **文件中设置arguments =“V = 1”'' ）。请注意，您应该非常小心您的** Application.mk **文件的内容。并确保您的APK仅构建** armeabi-v7a **，因为您没有针对其他ABI的** libnonfree.so **。 –
我编辑了我的答案，谢谢你的时间。 – Megatron300
你有这个'commandLine'字符串。添加''V = 1''作为其论据之一。 –