在linux环境下编译android so库

(1) 配置Android NDK环境

https://developer.android.google.cn/ndk/downloads/older_releases.html

1.下载android-ndk64-r10b-linux-x86_64.tar.bz2，下载地址：http://dl.google.com/android/ndk/android-ndk64-r10b-linux-x86_64.tar.bz2

2. 把下载好的android-ndk64-r10b版本解压

3.配置环境变量命令：$sudo gedit ~/.bashrc

添加以下代码：

export   NDK=/home/davebobo/android-ndk-r10b

export   PATH=${PATH}:$NDK  保存关闭。

5.source  ~/.bashrc使其修改的文件生效。

6.ndk-build看看咱们配置环境变量成功没，只要没出command not found就证明环境变量配置成功,如果成功显示如下，

(2) Android mk文件编写

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
# OpenCV
OPENCV_CAMERA_MODULES:=on
OPENCV_INSTALL_MODULES:=on
OPENCV_LIB_TYPE:=STATIC
#include D:\project\Android\OpenCV-2.4.10-android-sdk\sdk\native\jni\OpenCV.mk
include $(LOCAL_PATH)/opencv_android/jni/OpenCV.mk

LOCAL_MODULE    := facequality
LOCAL_SRC_FILES += facequality.cpp 

LOCAL_LDLIBS += -L$(SYSROOT)/usr/lib -llog
LOCAL_CFLAGS += -ffast-math -lpthread -ldl -O3 -std=c++11
LOCAL_CFLAGS += -DBUILD_TBB=ON -DWITH_TBB=ON
LOCAL_LDFLAGS += -Wl,--gc-sections

LOCAL_CFLAGS += -fopenmp
LOCAL_CPPFLAGS += -fopenmp
LOCAL_LDFLAGS += -fopenmp

LOCAL_LDLIBS += -lz -llog -ljnigraphics

include $(BUILD_SHARED_LIBRARY)

Application.mk 编写

#Application.mk 控制编译的版本
APP_STL:=c++_shared
APP_CPPFLAGS:=-frtti -fexceptions
APP_ABI := arm64-v8a

(3) 目录文件

(4) 编译

$ ndk-build
[arm64-v8a] Compile++ : facequality <= facequality.cpp
jni/facequality.cpp:116:1: warning: control may reach end of non-void function [-Wreturn-type]
}
^
1 warning generated.
[arm64-v8a] SharedLibrary : libfacequality.so
[arm64-v8a] Install : libfacequality.so => libs/arm64-v8a/libfacequality.so