android的Android.mk,Application.mk以及build.gradle的编写

1.Android.mk

LOCAL_PATH := $(call my-dir)#链接动态so库时，需要预编译才可以链接include $(CLEAR_VARS)LOCAL_MODULE := PicDetectLOCAL_SRC_FILES := prebuilt/libPicDetect.soLOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/prebuiltinclude $(PREBUILT_SHARED_LIBRARY)include $(CLEAR_VARS)LOCAL_MODULE    := picdetect-jniLOCAL_SRC_FILES := org_hik_PicDetect.cppLOCAL_SHARED_LIBRARIES := libPicDetectLOCAL_LDLIBS := -lc -lm -lstdc++ -llogLOCAL_CPP_FEATURES += exceptions                #NDK 编译器的 C++ 异常控制特性支持默认是关闭的，添加该行命令，便可以打开异常控制特性include $(BUILD_SHARED_LIBRARY)

2.Application.mk

APP_OPTIM := releaseAPP_PLATFORM := android-9APP_STL := c++_staticAPP_CPPFLAGS += -fexceptions -std=c++11 -frtti#APP_GNUSTL_FORCE_CPP_FEATURES := exceptions rtti

3.build.gradle

apply plugin: 'com.android.application'//生成apk//apply plugin: 'com.android.library'//生成so和jar包，不生apkandroid {    compileSdkVersion 25    buildToolsVersion '26.0.2'    defaultConfig {        applicationId "org.hik.picture"  //生成apk时要指定应用id        minSdkVersion 21        targetSdkVersion 23        versionCode 1        versionName "1.0"        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"        ndk{            moduleName "picdetect-jni" //lib的名称，对应LOCAL_MODULE            ldLibs "log", "z", "m"  //链接时使用到的库，对应LOCAL_LDLIBS *注意ldLibs "log"一行，由于在test.c中#include "android/log.h"，所以必须把log.h包含进来。             abiFilters "x86_64"//"x86_64"//"arm64-v8a"//"x86"//指定某种架构的CPU的so文件//"arm64-v8a","armeabi-v7a",            //cFlags 编译gcc的flag，对应LOCAL_CFLAGS        }//        externalNativeBuild {//            cmake {//                abiFilters 'arm64-v8a'//,'arm64-v8a'//                //abiFilters 'arm64-v8a'//                cppFlags "-frtti -fexceptions"//            }//        }    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }    sourceSets.main{        jni.srcDirs = []//disable automatic ndk-build call 屏蔽gradle自动生成Android.mk        jniLibs.srcDirs = ['libs']//这个脚本的意思是把app下的libs文件夹，当成原本/src/main下的jniLibs文件夹，这样就可以加载so库了。    }    externalNativeBuild{        ndkBuild{            path "src/main/jni/Android.mk"        }    }//    externalNativeBuild {//        cmake {//            path 'CMakeLists.txt'//        }//    }}dependencies {    compile fileTree(dir: 'libs', include: ['*.jar'])    compile 'com.android.support:appcompat-v7:25.2.0'}

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