Android NDK - 没有这样的文件或目录编译终止 - 头文件导出问题

Question

我正在尝试使用 NDK 将 TagLib C++ 库 ( http://taglib.github.io/ ) 导入到 Android。

通过将所有源代码放在 /jni/taglibroot/ 下，我能够成功编译库，如下图所示:

并在 /jni 文件夹中运行 ndk-build。

但是，我还创建了下面的 tag_lib_personal.cpp 文件(以使用 TagLib API):

#include <jni.h>
/*#include <iostream>
#include <iomanip>*/
#include <stdio.h>

#include <taglibroot/taglib/fileref.h>
#include <taglibroot/taglib/tag.h>
#include <taglibroot/taglib/tpropertymap.h>


#ifdef __cplusplus
extern "C"
{
#endif

    jstring Java_com_mindtherobot_samples_ndkfoo_NdkFooActivity_invokeNativeFunction(JNIEnv* env, jobject javaThis) {

      TagLib::FileRef f(argv[i]);

      if(!f.isNull() && f.audioProperties()) {

        TagLib::AudioProperties *properties = f.audioProperties();

        int seconds = properties->length() % 60;
        int minutes = (properties->length() - seconds) / 60;

        /*cout << "-- AUDIO --" << endl;
        cout << "bitrate     - " << properties->bitrate() << endl;
        cout << "sample rate - " << properties->sampleRate() << endl;
        cout << "channels    - " << properties->channels() << endl;
        cout << "length      - " << minutes << ":" << formatSeconds(seconds) << endl;*/
      }

      return "hello world!";

      //return (*env)->NewStringUTF(env, "Hello from native code!");
}

#ifdef __cplusplus
}
#endif

但是我无法让它编译。当我尝试再次运行 ndk-build 时，出现以下错误:

[armeabi] Compile++ arm  : my_own_source_files <= tag_lib_personal.cpp
In file included from D:/blabla/eclipse-jee-indigo-SR2-win32-x86_64/workspace/Project//jni/tag_lib_personal.cpp:7:0:
D:/blabla/eclipse-jee-indigo-SR2-win32-x86_64/workspace/Project//jni/taglibroot/taglib/fileref.h:29:19: fatal error: tfile.h: No such file or directory
compilation terminated.
make.exe: *** [D:/blabla/eclipse-jee-indigo-SR2-win32-x86_64/workspace/Project//obj/local/armeabi/objs/my_own_source_files/tag_lib_personal.o] Error 1

错误表明它无法从 TagLib 库中找到一些 .h 文件。这是我的 Android.mk 文件:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := taglib_module
FILE_LIST := $(wildcard $(LOCAL_PATH)/taglibroot/*.cpp) #Based on: http://stackoverflow.com/a/8980441
LOCAL_SRC_FILES := $(FILE_LIST:$(LOCAL_PATH)/%=%)


LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/foo
LOCAL_EXPORT_CFLAGS := -DFOO=1
LOCAL_EXPORT_LDLIBS := -llog

LOCAL_ARM_MODE := arm

include $(BUILD_SHARED_LIBRARY)
# If I run ndk-build only on the above code, it compiles the TagLib library successfully and generates the .so files as expected


include $(CLEAR_VARS)
LOCAL_MODULE := my_own_source_files
LOCAL_SHARED_LIBRARIES := taglib_module
LOCAL_SRC_FILES := tag_lib_personal.cpp
LOCAL_C_INCLUDES := $(LOCAL_PATH)/taglibroot/taglib,\
                    $(LOCAL_PATH)/taglibroot/taglib/ape,\
                    $(LOCAL_PATH)/taglibroot/taglib/asf,\
                    $(LOCAL_PATH)/taglibroot/taglib/flac,\
                    $(LOCAL_PATH)/taglibroot/taglib/it,\
                    $(LOCAL_PATH)/taglibroot/taglib/mod,\
                    $(LOCAL_PATH)/taglibroot/taglib/mp4,\
                    $(LOCAL_PATH)/taglibroot/taglib/mpc,\
                    $(LOCAL_PATH)/taglibroot/taglib/mpeg,\
                    $(LOCAL_PATH)/taglibroot/taglib/mpeg/id3v1,\
                    $(LOCAL_PATH)/taglibroot/taglib/mpeg/id3v2,\
                    $(LOCAL_PATH)/taglibroot/taglib/mpeg/id3v2/frames,\
                    $(LOCAL_PATH)/taglibroot/taglib/ogg,\
                    $(LOCAL_PATH)/taglibroot/taglib/ogg/flac,\
                    $(LOCAL_PATH)/taglibroot/taglib/ogg/opus,\
                    $(LOCAL_PATH)/taglibroot/taglib/ogg/speex,\
                    $(LOCAL_PATH)/taglibroot/taglib/ogg/vorbis,\
                    $(LOCAL_PATH)/taglibroot/taglib/riff,\
                    $(LOCAL_PATH)/taglibroot/taglib/riff/aiff,\
                    $(LOCAL_PATH)/taglibroot/taglib/riff/wav,\
                    $(LOCAL_PATH)/taglibroot/taglib/s3m,\
                    $(LOCAL_PATH)/taglibroot/taglib/toolkit,\
                    $(LOCAL_PATH)/taglibroot/taglib/trueaudio,\
                    $(LOCAL_PATH)/taglibroot/taglib/wavpack,\
                    $(LOCAL_PATH)/taglibroot/taglib/xm

LOCAL_ARM_MODE := arm

include $(BUILD_SHARED_LIBRARY)

如您所见，我将 TagLib 库中至少有一个 .h 文件的每个目录都放在 LOCAL_EXPORT_C_INCLUDES 指令中，但由于某种原因它仍然找不到 tfile.h(位于 $(LOCAL_PATH)/taglibroot/taglib/toolkit 内)。我错过了什么？

Answer 1

你没有错过，你还有一个额外的;-)

LOCAL_C_INCLUDES 的语法不需要这些逗号。您只需列出所有目录。实际上，您可以改用 LOCAL_EXPORT_C_INCLUDES(您的帖子暗示您可能尝试过):

LOCAL_C_INCLUDES := $(LOCAL_PATH)/taglibroot/taglib\
                $(LOCAL_PATH)/taglibroot/taglib/ape\
                $(LOCAL_PATH)/taglibroot/taglib/asf\
                $(LOCAL_PATH)/taglibroot/taglib/flac\
                $(LOCAL_PATH)/taglibroot/taglib/it\
                $(LOCAL_PATH)/taglibroot/taglib/mod\
                $(LOCAL_PATH)/taglibroot/taglib/mp4\
                $(LOCAL_PATH)/taglibroot/taglib/mpc\
                $(LOCAL_PATH)/taglibroot/taglib/mpeg\
                $(LOCAL_PATH)/taglibroot/taglib/mpeg/id3v1\
                $(LOCAL_PATH)/taglibroot/taglib/mpeg/id3v2\
                $(LOCAL_PATH)/taglibroot/taglib/mpeg/id3v2/frames\
                $(LOCAL_PATH)/taglibroot/taglib/ogg\
                $(LOCAL_PATH)/taglibroot/taglib/ogg/flac\
                $(LOCAL_PATH)/taglibroot/taglib/ogg/opus\
                $(LOCAL_PATH)/taglibroot/taglib/ogg/speex\
                $(LOCAL_PATH)/taglibroot/taglib/ogg/vorbis\
                $(LOCAL_PATH)/taglibroot/taglib/riff\
                $(LOCAL_PATH)/taglibroot/taglib/riff/aiff\
                $(LOCAL_PATH)/taglibroot/taglib/riff/wav\
                $(LOCAL_PATH)/taglibroot/taglib/s3m\
                $(LOCAL_PATH)/taglibroot/taglib/toolkit\
                $(LOCAL_PATH)/taglibroot/taglib/trueaudio\
                $(LOCAL_PATH)/taglibroot/taglib/wavpack\
                $(LOCAL_PATH)/taglibroot/taglib/xm

注意 如果您以后遇到 ndk-build 的奇怪问题，第一个建议是运行 ndk-build V=1:它将记录 ndk-build 使用的所有实际编译命令，这可能经常会暴露各种 Android.mk 文件中的错误或拼写错误。

PS 你的构建最终会失败。构建taglib时，还需要编译taglibroot子目录下的所有.cpp文件!我建议您尝试使用 CMake 以设计构建方式构建库。 Android 补丁可以在这里找到:https://code.google.com/p/android-cmake .

您也可以尝试一种直接的方法，但我不确定它是否有效:

MY_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := taglib_module
LOCAL_PATH := $(MY_PATH)/taglibroot/taglib
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)\
        $(LOCAL_PATH)/ape\
        $(LOCAL_PATH)/asf\
        $(LOCAL_PATH)/flac\
        $(LOCAL_PATH)/it\
        $(LOCAL_PATH)/mod\
        $(LOCAL_PATH)/mp4\
        $(LOCAL_PATH)/mpc\
        $(LOCAL_PATH)/mpeg\
        $(LOCAL_PATH)/mpeg/id3v1\
        $(LOCAL_PATH)/mpeg/id3v2\
        $(LOCAL_PATH)/mpeg/id3v2/frames\
        $(LOCAL_PATH)/ogg\
        $(LOCAL_PATH)/ogg/flac\
        $(LOCAL_PATH)/ogg/opus\
        $(LOCAL_PATH)/ogg/speex\
        $(LOCAL_PATH)/ogg/vorbis\
        $(LOCAL_PATH)/riff\
        $(LOCAL_PATH)/riff/aiff\
        $(LOCAL_PATH)/riff/wav\
        $(LOCAL_PATH)/s3m\
        $(LOCAL_PATH)/toolkit\
        $(LOCAL_PATH)/trueaudio\
        $(LOCAL_PATH)/wavpack\
        $(LOCAL_PATH)/xm

FILE_LIST := $(foreach dir, $(LOCAL_EXPORT_C_INCLUDES), $(wildcard $(dir)/*.cpp))
LOCAL_SRC_FILES := $(FILE_LIST:$(LOCAL_PATH)/%=%)

LOCAL_EXPORT_CFLAGS := -DFOO=1
LOCAL_EXPORT_LDLIBS := -llog

LOCAL_ARM_MODE := arm

include $(BUILD_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_PATH := $(MY_PATH)
LOCAL_MODULE := my_own_shared_lib
LOCAL_SHARED_LIBRARIES := taglib_module
LOCAL_SRC_FILES := tag_lib_personal.cpp

LOCAL_ARM_MODE := arm

include $(BUILD_SHARED_LIBRARY)

请注意，在您的 Java 中，您将加载这两个库，顺序很重要:

Runtime.loadLibrary("taglib_module");
Runtime.loadLibrary("my_own_shared_lib");