我正在尝试使用NDK构建共享库。我的文件夹结构有两个文件夹,一个用C ++编写(core
),另一个用Java编写,名为project
,这是一个Android Studio项目。编译好C ++库并生成.a
文件,但它不会与共享库链接。这是我的build.gradle:
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:1.3.0'
classpath 'net.sf.proguard:proguard-gradle:5.2.1'
}
}
apply plugin: 'android-library'
android {
compileSdkVersion 16
buildToolsVersion "23.0.1"
defaultConfig {
minSdkVersion 16
targetSdkVersion 23
versionCode 1
versionName "1.0"
ndk {
moduleName "core"
cFlags "-std=c++11 -fexceptions -I../core/includes"
stl "stlport_shared"
}
}
sourceSets {
main {
manifest.srcFile 'AndroidManifest.xml'
jniLibs.srcDir 'libs'
jni.srcDirs = ['src/main/jni', 'src/main/jni/', 'jni/']
}
}
task buildNative(type: Exec, description: 'Compile JNI source via NDK') {
def ndkDir = plugins.getPlugin('com.android.library').sdkHandler.getNdkFolder()
commandLine "$ndkDir/ndk-build",
'-C', file('jni').absolutePath,
'-j', Runtime.runtime.availableProcessors(),
'all',
'NDK_DEBUG=1'
}
task cleanNative(type: Exec, description: 'Clean JNI object files') {
def ndkDir = plugins.getPlugin('com.android.library').sdkHandler.getNdkFolder()
commandLine "$ndkDir/ndk-build",
'-C', file('jni').absolutePath,
'clean'
}
task cleanBinaryFolders(type: Delete, description: 'Clean binary folders') {
delete 'libs', 'obj'
}
clean.dependsOn 'cleanNative'
clean.dependsOn 'cleanBinaryFolders'
tasks.withType(JavaCompile) {
compileTask -> compileTask.dependsOn buildNative
}
}
dependencies {
compile 'com.android.support:support-v4:20.0.0'
}
这是我的Android.mk:
SHELL = /bin/bash
MY_HOMEDIR = $(realpath $(shell pwd)/../..)
MY_COREDIR = $(MY_HOMEDIR)/core
MY_ANDROIDDIR = $(MY_HOMEDIR)/project
MY_CORESOURCES = $(shell find $(MY_COREDIR)/src -type f -name "*.cpp")
MY_BRIDGESOURCES = $(shell find $(MY_ANDROIDDIR)/jni -type f -name "*.cpp")
LOCAL_PATH = $(MY_HOMEDIR)
# Generate a static library from the core implementation
include $(CLEAR_VARS)
LOCAL_MODULE = core
LOCAL_SRC_FILES = $(MY_CORESOURCES)
TARGET_PLATFORM = android-16
TARGET_ARCH_ABI = all
LOCAL_C_INCLUDES = $(MY_COREDIR)/includes
#LOCAL_LDLIBS = -llog
LOCAL_CFLAGS = -llog -I$(MY_COREDIR)/includes
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE = project
LOCAL_SRC_FILES = $(MY_BRIDGESOURCES)
TARGET_PLATFORM = android-16
TARGET_ARCH_ABI = all
LOCAL_STATIC_LIBRARIES = core
LOCAL_C_INCLUDES = $(MY_COREDIR)/includes
LOCAL_LDLIBS = -lcore # I’m not sure about this
LOCAL_CFLAGS = -llog -I$(MY_COREDIR)/includes
include $(BUILD_SHARED_LIBRARY)
当像这样编译时,我得到了一堆undefined reference
错误,即使这些方法是由核心模块实现的。我错过了什么?
答案 0 :(得分:1)
https://stackoverflow.com/a/22401410/755804读到:
仅将LOCAL_LDLIBS用于系统库依赖项。如果你想指向另一个库,最好将它们列在LOCAL_STATIC_LIBRARIES和LOCAL_SHARED_LIBRARIES中(即使这意味着为它们定义一个PREBUILT_XXX模块),因为这可以让构建系统解决依赖关系并自动排序你。的