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
我想做什么: 我想将它存储在项目源代码树之外的文件夹中,而不是将所有源代码复制到jni /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,欢迎提出任何建议。
答案 0 :(得分:5)
你是对的,这不是导入模块的情况。您从本机代码中引用 avihi 库的方式仍为 LOCAL_SHARED_LIBRARIES (请参阅NDK示例 module-exports )。但是在jni/Android.mk
文件中,您可以使用include
命令到另一个文件。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。采用相同的样本,以下是它的工作原理:
原始Android.mk from samples/module-exports/jni:
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)
更改后的文件如下所示:
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)
外部 bar / 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两个文件都可以保存在动物园项目的树之外!