自动添加需要编译的源文件Android.mk模板

自动添加需要编译的源文件列表添加第三方静态库、动态库的依赖 假设我们的项目依赖 libmath.a, libjson.a, libffmpeg.so 这几个第三方库文件，项目包含如下几个模块：algorithm，core，network，utils，tests，每个模块都有若干个.c/.h文件，我们要把整个工程编译为动态库，并通过 native_sdk.c 中的函数向Java层提供调用接口。

LOCAL_PATH := $(call my-dir)3RD_INC_DIR = $(LOCAL_PATH)/3rd/inc3RD_LIB_DIR = $(LOCAL_PATH)/3rd/libs # Prebuild the 3rd libraries include $(CLEAR_VARS)LOCAL_MODULE := mathLOCAL_SRC_FILES := $(3RD_LIB_DIR)/libmath.ainclude $(PREBUILT_STATIC_LIBRARY) include $(CLEAR_VARS)LOCAL_MODULE := jsonLOCAL_SRC_FILES := $(3RD_LIB_DIR)/libjson.ainclude $(PREBUILT_STATIC_LIBRARY) include $(CLEAR_VARS)LOCAL_MODULE := ffmpegLOCAL_SRC_FILES := $(3RD_LIB_DIR)/libffmpeg.soinclude $(PREBUILT_SHARED_LIBRARY) # Build native sdk include $(CLEAR_VARS) LOCAL_MODULE := native_sdk LOCAL_SRC_FILES := \ $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/algorithm/*.c)) \ $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/core/*.c)) \ $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/network/*.c)) \ $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/utils/*.c)) \ $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/src/*.c)) LOCAL_C_INCLUDES := $(3RD_INC_DIR)LOCAL_C_INCLUDES += $(LOCAL_PATH)/src LOCAL_C_INCLUDES += $(LOCAL_PATH)/src/algorithmLOCAL_C_INCLUDES += $(LOCAL_PATH)/src/coreLOCAL_C_INCLUDES += $(LOCAL_PATH)/src/networkLOCAL_C_INCLUDES += $(LOCAL_PATH)/src/utils LOCAL_CFLAGS := -DANDROID LOCAL_LDLIBS := -llog LOCAL_STATIC_LIBRARIES := math jsonLOCAL_SHARED_LIBRARIES := ffmpeg include $(BUILD_SHARED_LIBRARY) # Build tests include $(CLEAR_VARS) LOCAL_MODULE := test.outLOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/tests/*.c)) LOCAL_CFLAGS := -DANDROID LOCAL_C_INCLUDES := $(LOCAL_PATH)/src LOCAL_LDLIBS := -llog -fPIE -pieLOCAL_SHARED_LIBRARIES:= native_sdkinclude $(BUILD_EXECUTABLE) 对于 Android.mk 而言，如果要依赖第三方库文件，则必须添加 PREBUILT_XXXX_LIBRARY 进行预编译，LOCAL_SRC_FILES 宏给出了需要编译的源文件列表，这里我通过 subst和wildcard 这两个函数，实现了自动扫描指定目录下的源文件，最后，通过 BUILD_EXECUTABLE 编译出可以运行于adb shell命令行的可执行程序，用于做代码的单元测试。附：:= 是覆盖之前的值?= 是如果没有被赋值过就赋予等号后面的值+= 是添加等号后面的值 make会将整个makefile展开后，再决定变量的值。也就是说，变量的值将会是整个makefile中最后被指定的值。看例子： x = foo y = $(x) bar x = xyz 在上例中，y的值将会是 xyz bar ，而不是 foo bar 。 “:=”表示变量的值决定于它在makefile中的位置，而不是整个makefile展开后的最终值。 x := foo y := $(x) bar x := xyz 在上例中，y的值将会是 foo bar ，而不是 xyz bar 了。参考：http://ticktick.blog.51cto.com/823160/1733500/