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我嘗試添加C函數到我的Java Android應用程序。
我已經成功地在C.
在這個文件中的hello.c我打電話包含在另一個文件（astart.c）另一個C函數本身在另一個文件調用另一個函數C運行基本功能的Hello World（util.c ）在其他文件中調用其他函數。
沒問題，不是嗎？未定義的引用與CMake的功能在Android Studio中
我的庫添加到我的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)
add_library(hello
# Sets the library as a shared library.
SHARED
src/main/myCpp/hello.c)
add_library(astart
# Sets the library as a shared library.
SHARED
src/main/myCpp/astart.c)
add_library(ai
# Sets the library as a shared library.
SHARED
src/main/myCpp/lib/ai.c)
add_library(sha
# Sets the library as a shared library.
SHARED
src/main/myCpp/lib/sha.c)
add_library(util
# Sets the library as a shared library.
SHARED
src/main/myCpp/lib/util.c)
add_library(allnet_log
# Sets the library as a shared library.
SHARED
src/main/myCpp/lib/allnet_log.c)
#add_library(packet
# Sets the library as a shared library.
# SHARED
# src/main/myCpp/lib/packet.c)
add_library(configfiles
# Sets the library as a shared library.
SHARED
src/main/myCpp/lib/configfiles.c)
add_library(allnet_queue
# Sets the library as a shared library.
SHARED
src/main/myCpp/lib/allnet_queue.c)
# Add the directories where the Cpp header files are to let CMake find them during compile time
include_directories(src/main/myCpp/)
include_directories(src/main/myCpp/lib/)
# 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
# Links the target library to the log library
# included in the NDK.
${log-lib})
我gradle這個文件：
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25.0.0"
defaultConfig {
applicationId "com.example.hippolytelacassagne.allnet"
minSdkVersion 19
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
externalNativeBuild {
cmake {
cppFlags ""
cFlags "-fexceptions"
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "CMakeLists.txt"
}
}
// If you want Gradle to package prebuilt native libraries
// with your APK, modify the default source set configuration
// to include the directory of your prebuilt .so files as follows.
sourceSets {
main {
jni.srcDirs = []
jniLibs.srcDirs 'imported-lib/src/', 'more-imported- libs/src/'
}
}
}
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-v7:25.3.1'
testCompile 'junit:junit:4.12'
}
我的hello.c稱爲Home.java：
#include <jni.h>
#include "lib/app_util.h"
#include "lib/packet.h"
#include "astart.c"
JNIEXPORT
jstring
JNICALL
Java_com_example_hippolytelacassagne_allnet_Home_Hello(
JNIEnv *env,
jobject callingObject)
{
char * args [] = { "allnet", "-v", "def", NULL };
astart_main(3, args);
return (*env)->NewStringUTF(env, "Hello World");
}
的包括如果叫hello.c的astart.c：
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <signal.h>
#include <pwd.h>
#include <ifaddrs.h>
#include <dirent.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h> /* IFF_LOOPBACK, etc */
#include <arpa/inet.h> /* inet_addr */
#include "lib/util.h"
#include "lib/allnet_log.h"
#include "lib/packet.h"
#include "lib/configfiles.h"
#include "lib/allnet_queue.h"
而且包括util.c叫astart.c的：
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <time.h>
#include <assert.h>
#include <errno.h>
#include <netdb.h> /* h_errno */
#include <dirent.h> /* h_errno */
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "packet.h"
#include "mgmt.h"
#include "allnet_log.h"
#include "util.h"
#include "ai.h"
#include "sha.h"
這裏是gradle這個控制檯的錯誤消息：
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:externalNativeBuildDebug'.
> Build command failed.
Error while executing '/Users/hippolytelacassagne/Library/Android/sdk/cmake/3.6.4111459/bin/cmake' with arguments {--build /Users/hippolytelacassagne/AndroidStudioProjects/Allnet/app/.externalNativeBuild/cmake/debug/mips64 --target util}
[1/2] Building C object CMakeFiles/util.dir/src/main/myCpp/lib/util.c.o
[2/2] Linking C shared library ../../../../build/intermediates/cmake/debug/obj/mips64/libutil.so
FAILED: : && /Users/hippolytelacassagne/Library/Android/sdk/ndk-bundle/toolchains/llvm/prebuilt/darwin-x86_64/bin/clang --target=mips64el-none-linux-android --gcc-toolchain=/Users/hippolytelacassagne/Library/Android/sdk/ndk-bundle/toolchains/mips64el-linux-android-4.9/prebuilt/darwin-x86_64 --sysroot=/Users/hippolytelacassagne/Library/Android/sdk/ndk-bundle/sysroot -fPIC -isystem /Users/hippolytelacassagne/Library/Android/sdk/ndk-bundle/sysroot/usr/include/mips64el-linux-android -D__ANDROID_API__=21 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -fintegrated-as -Wa,--noexecstack -Wformat -Werror=format-security -fexceptions -O0 -fno-limit-debug-info -Wl,--exclude-libs,libgcc.a --sysroot /Users/hippolytelacassagne/Library/Android/sdk/ndk-bundle/platforms/android-21/arch-mips64 -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,libutil.so -o ../../../../build/intermediates/cmake/debug/obj/mips64/libutil.so CMakeFiles/util.dir/src/main/myCpp/lib/util.c.o -lm && :
CMakeFiles/util.dir/src/main/myCpp/lib/util.c.o: In function `mgmt_to_string':
/Users/hippolytelacassagne/AndroidStudioProjects/Allnet/app/src/main/myCpp/lib/util.c:245: undefined reference to `ia_to_string'
/Users/hippolytelacassagne/AndroidStudioProjects/Allnet/app/src/main/myCpp/lib/util.c:274: undefined reference to `ia_to_string'
CMakeFiles/util.dir/src/main/myCpp/lib/util.c.o: In function `init_packet':
/Users/hippolytelacassagne/AndroidStudioProjects/Allnet/app/src/main/myCpp/lib/util.c:532: undefined reference to `sha512_bytes'
CMakeFiles/util.dir/src/main/myCpp/lib/util.c.o: In function `print_gethostbyname_error':
/Users/hippolytelacassagne/AndroidStudioProjects/Allnet/app/src/main/myCpp/lib/util.c:1554: undefined reference to `log_print'
clang: 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.
BUILD FAILED
這樣看來，這些錯誤來自util.c的一些功能。
我不明白，因爲據說是沒有定義的函數中包含的文件中定義。
有沒有人有想法？謝謝。