Android Studio 2.2 External Build

|-test
|---Android.mk
|---Application.mk
|---sub1
|------Android.mk
|------main.c
|---sub2
|------Android.mk
|------main.c

拿上边的文件结构为例

test/Android.mk

include $(call all-subdir-makefiles)

test/sub1/Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_CFLAGS += -pie -fPIE
LOCAL_LDFLAGS += -pie -fPIE -llog
TARGET_PLATFORM := android-22
LOCAL_MODULE := module1
LOCAL_SRC_FILES := main.c
include $(BUILD_EXECUTABLE)

test/sub2/Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
ARGET_PLATFORM := android-22
LOCAL_MODULE := module2
LOCAL_SRC_FILES := main.c
include $(BUILD_SHARED_LIBRARY) 

原理就是 all-subdir-makefiles 这个宏会返子文件夹下所有Android.mk文件的路径