今天簡單寫了一個 Android.mk 的示例模板，供初學(xué)者參考。
本模板主要給大家示例 Android NDK 開發(fā)中的如下幾個問題：

1. 如何自動添加需要編譯的源文件列表
2. 如何添加第三方靜態(tài)庫、動態(tài)庫的依賴
3. 如何構(gòu)造一個完整的NDK工程框架

假設(shè)我們的項(xiàng)目依賴 libmath.a, libjson.a, libffmpeg.so 這幾個第三方庫文件，項(xiàng)目包含如下幾個模塊：algorithm，core，network，utils，tests，每個模塊都有若干個.c/.h文件，我們要把整個工程編譯為動態(tài)庫，并通過 native_sdk.c 中的函數(shù)向Java層提供調(diào)用接口。
那么，我們可以對 Android 工程的 jni 目錄，做如下劃分：

對應(yīng)的 Android.mk 文件的寫法示例如下：

LOCAL_PATH := $(call my-dir)
3RD_INC_DIR = $(LOCAL_PATH)/3rd/inc
3RD_LIB_DIR = $(LOCAL_PATH)/3rd/libs
 
# Prebuild the 3rd libraries 
 
include $(CLEAR_VARS)
LOCAL_MODULE := math
LOCAL_SRC_FILES := $(3RD_LIB_DIR)/libmath.a
include $(PREBUILT_STATIC_LIBRARY)
 
include $(CLEAR_VARS)
LOCAL_MODULE := json
LOCAL_SRC_FILES := $(3RD_LIB_DIR)/libjson.a
include $(PREBUILT_STATIC_LIBRARY)
 
include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := $(3RD_LIB_DIR)/libffmpeg.so
include $(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/algorithm
LOCAL_C_INCLUDES += $(LOCAL_PATH)/src/core
LOCAL_C_INCLUDES += $(LOCAL_PATH)/src/network
LOCAL_C_INCLUDES += $(LOCAL_PATH)/src/utils
 
LOCAL_CFLAGS := -DANDROID                                      
LOCAL_LDLIBS := -llog 
 
LOCAL_STATIC_LIBRARIES := math json
LOCAL_SHARED_LIBRARIES := ffmpeg
 
include $(BUILD_SHARED_LIBRARY)
 
 
# Build tests
 
include $(CLEAR_VARS)    
LOCAL_MODULE := test.out
LOCAL_SRC_FILES := $(subst $(LOCAL_PATH)/,,$(wildcard $(LOCAL_PATH)/tests/*.c)) 
LOCAL_CFLAGS := -DANDROID 
LOCAL_C_INCLUDES := $(LOCAL_PATH)/src 
LOCAL_LDLIBS := -llog -fPIE -pie
LOCAL_SHARED_LIBRARIES:= native_sdk
include $(BUILD_EXECUTABLE)

對于 Android.mk 而言，如果要依賴第三方庫文件，則必須添加 PREBUILT_XXXX_LIBRARY 進(jìn)行預(yù)編譯，LOCAL_SRC_FILES 宏給出了需要編譯的源文件列表，這里我通過 subst和wildcard 這兩個函數(shù)，實(shí)現(xiàn)了自動掃描指定目錄下的源文件，最后，通過 BUILD_EXECUTABLE 編譯出可以運(yùn)行于adb shell命令行的可執(zhí)行程序，用于做代碼的單元測試。文章來源地址http://www.zghlxwxcb.cn/news/detail-682403.html

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