我得到的错误：
error: undefined reference to ‘__android_log_print’
我已将此行添加到我的.cpp文件中：
#include <android/log.h>
我尝试过两种方法：__ android_log_print和__android_log_write
我还在我的Android.mk文件(我手动编译)中链接了日志库.
LOCAL_LDLIBS：= –llog
我也尝试了几种我认为的替代品：
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog
这是我的Android.mk：
LOCAL_PATH := $(call my-dir) #used to skip re-compiling libraw #include $(CLEAR_VARS) #LOCAL_MODULE := libraw_r #LOCAL_SRC_FILES := ../obj/local/armeabi/libraw_r.so #LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/libraw #include $(PREBUILT_SHARED_LIBRARY) #used for compiling libraw include $(CLEAR_VARS) LOCAL_CFLAGS += -I$(SYSROOT)/usr/lib/include/libraw -pthread -w LOCAL_CXXFLAGS += -I$(SYSROOT)/usr/lib/include/libraw -pthread -w LOCAL_MODULE := libraw_r # name of your module LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -lstdc++ # libraries to link against,lstdc++ is auto-linked LOCAL_SRC_FILES := internal/dcraw_common.cpp internal/dcraw_fileio.cpp internal/demosaic_packs.cpp src/libraw_cxx.cpp src/libraw_c_api.cpp LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/libraw include $(BUILD_SHARED_LIBRARY) include $(CLEAR_VARS) LOCAL_MODULE := armapi LOCAL_SRC_FILES := armapi.cpp LOCAL_SHARED_LIBRARIES := libraw_r include $(BUILD_SHARED_LIBRARY) LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog
这是build.gradle文件：
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:1.0.0+'
}
}
apply plugin: 'android'
dependencies {
compile filetree(dir: 'libs',include: '*.jar')
}
android {
compileSdkVersion 21
buildToolsversion "21.1.2"
defaultConfig {
ndk {
moduleName "armapi"
ldLibs "log"
}
}
sourceSets {
main {
manifest.srcFile 'AndroidManifest.xml'
jniLibs.srcDir 'libs' // use the jni .so compiled from the manual ndk-build command
jni.srcDirs = [] //disable automatic ndk-build call
java.srcDirs = ['src']
resources.srcDirs = ['src']
aidl.srcDirs = ['src']
renderscript.srcDirs = ['src']
res.srcDirs = ['res']
assets.srcDirs = ['assets']
}
// Move the tests to tests/java,tests/res,etc...
instrumentTest.setRoot('tests')
// Move the build types to build-types/<type>
// For instance,build-types/debug/java,build-types/debug/AndroidManifest.xml,...
// This moves them out of them default location under src/<type>/... which would
// conflict with src/ being used by the main source set.
// Adding new build types or product flavors should be accompanied
// by a similar customization.
debug.setRoot('build-types/debug')
release.setRoot('build-types/release')
}
}
解决方法
似乎使用Gradle Android Studio会忽略Android.mk文件.
如here所述,尝试将以下指令添加到build.gradle：
android {
defaultConfig {
ndk {
moduleName "modulename"
ldLibs "log"
}
}
}