主项目源树外的ndk构建库

Question

我想使用ndk构建第三方库avahi.avahi已经有了android端口(有效的Android.mk).

我做了什么:我已经成功创建了一个项目并将所有源代码复制到jni /文件夹并运行ndk-build.它构建了libavahi.so

我想做的事情:我不想将所有源代码复制到jni /文件夹中,而是将其存储在项目源代码树之外的文件夹中.我该怎么办？我查看了NDK文档/导入模块,但没有类似于我的情况.

ndk中的新手,欢迎任何建议.

Answer 1

你是对的,这不是导入模块的情况.从本机代码引用avihi库的方式仍然是LOCAL_SHARED_LIBRARIES(请参阅NDK示例模块 - 导出).但是在您的jni/Android.mk文件中,您可以将include命令用于其他文件.此命令与C中的#include语句非常相似.此文件不必位于项目树中.采用相同的示例,以下是它的工作原理:

来自samples/module-exports/jni的原始Android.mk:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := foo
LOCAL_SRC_FILES := foo/foo.c
LOCAL_CFLAGS := -DFOO=2
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/foo
LOCAL_EXPORT_CFLAGS := -DFOO=1
LOCAL_EXPORT_LDLIBS := -llog
include $(BUILD_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := bar
LOCAL_SRC_FILES := bar/bar.c
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/bar
LOCAL_STATIC_LIBRARIES := foo
include $(BUILD_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := zoo
LOCAL_SRC_FILES := zoo/zoo.c
LOCAL_SHARED_LIBRARIES := bar
include $(BUILD_SHARED_LIBRARY)

更改的文件如下所示:

ZOO_LOCAL_PATH := $(call my-dir)
include ~/projects/bar/jni/Android.mk
LOCAL_PATH := $(ZOO_LOCAL_PATH)

include $(CLEAR_VARS)
LOCAL_MODULE := zoo
LOCAL_SRC_FILES := zoo/zoo.c
LOCAL_SHARED_LIBRARIES := bar
include $(BUILD_SHARED_LIBRARY)

而外部酒吧/ JNI/Android.mk如下:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := foo
LOCAL_SRC_FILES := foo/foo.c
LOCAL_CFLAGS := -DFOO=2
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/foo
LOCAL_EXPORT_CFLAGS := -DFOO=1
LOCAL_EXPORT_LDLIBS := -llog
include $(BUILD_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := bar
LOCAL_SRC_FILES := bar/bar.c
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/bar
LOCAL_STATIC_LIBRARIES := foo
include $(BUILD_SHARED_LIBRARY)

现在,bar.c和foo.c这两个文件可能都保存在动物园项目的树之外!