前言

本章主要讲述 curl 编译支持https

1:准备
curl7.85.0 https://curl.se/download.html
openssl-3.0.5.tar.gz https://www.openssl.org
zlib1.2.12 https://zlib.net/
ubuntu18 （ubuntu16都可以） 这里是用的是虚拟机里安装的
android-ndk-r21e https://developer.android.google.cn/ndk/downloads/
目录结构如下
curl curl安装目录
out openssl安装目录
zlib zlib 安装目录
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2:编译openssl
1> 写编译脚本
./Configure --help 查看说明

写了个shell脚本，直接上脚本（部分参考别人写的），
NOTES-ANDROID.md 画红框这段，官方编译android说明
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func_build(){
	cd $HOME/ndk/openssl-3.0.5
	
	rm -rf $HOME/ndk/out/output-$ARCH
	mkdir  $HOME/ndk/out/output-$ARCH
	export ANDROID_NDK_ROOT=$HOME/ndk/android-ndk-r21e
	#export PATH=$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH
	#export PATH=$ANDROID_NDK_ROOT/toolchains/$TOOL_CHAIN/prebuilt/linux-x86_64/bin:$PATH
	export PATH=$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/bin:$ANDROID_NDK_ROOT/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin:$PATH
	#./Configure android-$ARCH_NAME -D__ANDROID_API__=23 --prefix=$HOME/ndk/out/output-$ARCH -fPIC
	./Configure $ARCH_NAME -D__ANDROID_API__=23 --prefix=$HOME/ndk/out/output-$ARCH -fPIC
	make clean
	make && make install
}

#export ANDROID_NDK_ROOT=$HOME/ndk/android-ndk-r21e
#export PATH=$ANDROID_NDK_ROOT/toolchains/llvm/prebuilt/linux-x86_64/bin:$ANDROID_NDK_ROOT/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin:$PATH
#`android-arm`, `android-arm64`,  `android-x86` and `android-x86_64` , `android-mips`,`android-mip64`,
#armeabi-v7a armeabi arm64-v8a x86 x86_64 mips mips64
for ARCH in armeabi-v7a arm64-v8a x86 x86_64
do
	echo $ARCH
	if [ "$ARCH" = "armeabi-v7a" ]; then
		ARCH_NAME=android-arm
		TOOL_CHAIN=arm-linux-androideabi-4.9
	fi
	if [ "$ARCH" = "arm64-v8a" ]; then
		ARCH_NAME=android-arm64
		TOOL_CHAIN=aarch64-linux-android-4.9
	fi
	if [ "$ARCH" = "x86" ]; then
		ARCH_NAME=android-x86
		TOOL_CHAIN=x86-4.9
	fi
	if [ "$ARCH" = "x86_64" ]; then
		ARCH_NAME=android-x86_64
		TOOL_CHAIN=x86_64-4.9
	fi
	func_build
done

2>make &&make install
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生成so a 文件 eg:arm64-v8a
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3:编译zlib
感觉这个用处不大
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.全脚本编译没完成，先手动编译了（这里以x86为例）
1>

./configure --prefix=$HOME/ndk/zlib/out-x86

2> 修改生成的 Makefile 文件
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3> make && make install
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4:编译curl
参考官方编译说明
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上编译脚本 android_curl_build.sh 可以间化的（有时间再优化下，看起冗长的）

export ANDROID_NDK_ROOT=$HOME/ndk/android-ndk-r21e
export NDK=$HOME/ndk/android-ndk-r21e
export HOST_TAG=linux-x86_64
export TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/$HOST_TAG
#armeabi-v7a arm64-v8a x86 x86_64
for ARCH in armeabi-v7a arm64-v8a x86 x86_64
do
       
	if [ "$ARCH" = "armeabi-v7a" ]; then
		ARCH_NAME=android-arm
		rm -rf $HOME/ndk/curl/output-$ARCH
		mkdir  $HOME/ndk/curl/output-$ARCH
		#TOOL_CHAIN=arm-linux-androideabi-4.9
		export AR=$TOOLCHAIN/bin/arm-linux-androideabi-ar
		export AS=$TOOLCHAIN/bin/arm-linux-androideabi-as
		export CC=$TOOLCHAIN/bin/armv7a-linux-androideabi23-clang
		export CXX=$TOOLCHAIN/bin/armv7a-linux-androideabi23-clang++
		export LD=$TOOLCHAIN/bin/arm-linux-androideabi-ld
		export RANLIB=$TOOLCHAIN/bin/arm-linux-androideabi-ranlib
		export STRIP=$TOOLCHAIN/bin/arm-linux-androideabi-strip
		#--disable-static --enable-shared    #share  only 
		#--enable-static --enable-shared  # static share
		./configure --host arm-linux-androideabi --enable-static --enable-shared --without-libidn --without-librtmp --without-gnutls --without-nss --without-libssh2  --without-winidn --disable-rtsp --disable-ldap --disable-ldaps --disable-ipv6 --with-openssl=$HOME/ndk/out/output-$ARCH --with-zlib=$HOME/ndk/zlib/out-$ARCH  --prefix=$HOME/ndk/curl/output-$ARCH
	fi
	if [ "$ARCH" = "arm64-v8a" ]; then
		ARCH_NAME=android-arm64
		#TOOL_CHAIN=aarch64-linux-android-4.9
		rm -rf $HOME/ndk/curl/output-$ARCH
		mkdir  $HOME/ndk/curl/output-$ARCH
		export AR=$TOOLCHAIN/bin/aarch64-linux-android-ar
		export AS=$TOOLCHAIN/bin/aarch64-linux-android-as
		export CC=$TOOLCHAIN/bin/aarch64-linux-android23-clang
		export CXX=$TOOLCHAIN/bin/aarch64-linux-android23-clang++
		export LD=$TOOLCHAIN/bin/aarch64-linux-android-ld
		export RANLIB=$TOOLCHAIN/bin/aarch64-linux-android-ranlib
		export STRIP=$TOOLCHAIN/bin/aarch64-linux-android-strip
		./configure --host aarch64-linux-android --enable-static --enable-shared --without-libidn --without-librtmp --without-gnutls --without-nss --without-libssh2  --without-winidn --disable-rtsp --disable-ldap --disable-ldaps --disable-ipv6 --with-openssl=$HOME/ndk/out/output-$ARCH --with-zlib=$HOME/ndk/zlib/out-$ARCH  --prefix=$HOME/ndk/curl/output-$ARCH
	fi
	
	if [ "$ARCH" = "x86" ]; then
		ARCH_NAME=android-x86
		#TOOL_CHAIN=x86-4.9
		rm -rf $HOME/ndk/curl/output-$ARCH
		mkdir  $HOME/ndk/curl/output-$ARCH
		export AR=$TOOLCHAIN/bin/i686-linux-android-ar
		export AS=$TOOLCHAIN/bin/i686-linux-android-as
		export CC=$TOOLCHAIN/bin/i686-linux-android23-clang
		export CXX=$TOOLCHAIN/bin/i686-linux-android23-clang++
		export LD=$TOOLCHAIN/bin/i686-linux-android-ld
		export RANLIB=$TOOLCHAIN/bin/i686-linux-android-ranlib
		export STRIP=$TOOLCHAIN/bin/i686-linux-android-strip
		./configure --host i686-linux-android --enable-static --enable-shared --without-libidn --without-librtmp --without-gnutls --without-nss --without-libssh2  --without-winidn --disable-rtsp --disable-ldap --disable-ldaps --disable-ipv6 --with-openssl=$HOME/ndk/out/output-$ARCH --with-zlib=$HOME/ndk/zlib/out-$ARCH  --prefix=$HOME/ndk/curl/output-$ARCH
	fi
	if [ "$ARCH" = "x86_64" ]; then
		ARCH_NAME=android-x86_64
		#TOOL_CHAIN=x86_64-4.9
		rm -rf $HOME/ndk/curl/output-$ARCH
		mkdir  $HOME/ndk/curl/output-$ARCH
		export AR=$TOOLCHAIN/bin/x86_64-linux-android-ar
		export AS=$TOOLCHAIN/bin/x86_64-linux-android-as
		export CC=$TOOLCHAIN/bin/x86_64-linux-android23-clang
		export CXX=$TOOLCHAIN/bin/x86_64-linux-android23-clang++
		export LD=$TOOLCHAIN/bin/x86_64-linux-android-ld
		export RANLIB=$TOOLCHAIN/bin/x86_64-linux-android-ranlib
		export STRIP=$TOOLCHAIN/bin/x86_64-linux-android-strip
		./configure --host x86_64-linux-android --enable-static --enable-shared --without-libidn --without-librtmp --without-gnutls --without-nss --without-libssh2  --without-winidn --disable-rtsp --disable-ldap --disable-ldaps --disable-ipv6 --with-openssl=$HOME/ndk/out/output-$ARCH --with-zlib=$HOME/ndk/zlib/out-$ARCH  --prefix=$HOME/ndk/curl/output-$ARCH
	fi
	
	make clean
	make && make install
done

编译结果
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5:写android 工程测试
参考android curl.so使用(二)
com_example_testcurl_JNIUtils.cpp 内容如下

#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include "curl/curl.h"
#include <string>
using namespace std ;
#include "com_example_testcurl_JNIUtils.h"

#include <android/log.h>



#define TAG "CURLLIB"
#define LOGI(FORMAT,...) __android_log_print(ANDROID_LOG_INFO, TAG, FORMAT, ##__VA_ARGS__);
#define LOGE(FORMAT,...) __android_log_print(ANDROID_LOG_ERROR, TAG, FORMAT, ##__VA_ARGS__);

size_t write_callback(char *ptr, size_t size, size_t nmemb, void *userdata)
{
    ((std::string*)userdata)->append(ptr, nmemb);
    return nmemb;
}

JNIEXPORT jstring JNICALL Java_com_example_testcurl_JNIUtils_curlhttpget
  (JNIEnv *env, jclass jc, jstring js){
    curl_global_init(CURL_GLOBAL_DEFAULT);
    CURL* curl = curl_easy_init();
    std::string response_data;
    if (curl)
    {
        jboolean  b = JNI_TRUE ;
        const char *nativeString = (const char *)env->GetStringUTFChars(js, &b);
        curl_easy_setopt(curl, CURLOPT_URL, nativeString);
        // no certificate, not verify server certificate
       // curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
      // curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
      // curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
       curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, false);
       curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, true);

        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response_data);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_callback);

        curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 3); //是从请求开始到响应总共等待的时间
        curl_easy_setopt(curl, CURLOPT_TIMEOUT, 2);  是响应等待的时间，后面的数字是等待的秒数

        CURLcode res = curl_easy_perform(curl);
        if (res != CURLE_OK)
        {
           // long nRes = curl_easy_strerror(res) ;
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                curl_easy_strerror(res));

        //     char szbuf[1024]={0,};
        //     sprintf(szbuf,"%s",curl_easy_strerror(res));

        //      response_data = szbuf ;
        }
        else
        {
            // response_data ="[0]";
            long response_code;
            curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
            printf("response code %d \n", response_code);
            printf("response data : \n ");
            printf("%s",response_data.c_str());
            LOGI("[res]%ld-%s",response_code,response_data.c_str())
        }

        curl_easy_cleanup(curl);
    }

    curl_global_cleanup();
    return  env->NewStringUTF(response_data.c_str());
 }

Android.mk 如下

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := crypto
LOCAL_SRC_FILES := $(TARGET_ARCH_ABI)/libcrypto.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := ssl
LOCAL_SRC_FILES := $(TARGET_ARCH_ABI)/libssl.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := z
LOCAL_SRC_FILES := $(TARGET_ARCH_ABI)/libz.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := curl
LOCAL_SRC_FILES := $(TARGET_ARCH_ABI)/libcurl.so
include $(PREBUILT_SHARED_LIBRARY)
#LOCAL_SRC_FILES := $(TARGET_ARCH_ABI)/libcurl.a
#include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE    := TestCallCurl

#LOCAL_C_INCLUDES := $(LOCAL_PATH)/include

LOCAL_SRC_FILES := \
    com_example_testcurl_JNIUtils.cpp

LOCAL_C_INCLUDES += $(LOCAL_PATH)/include
#LOCAL_LDLIBS :=  -llog

LOCAL_LDLIBS := -L$(TARGET_ARCH_ABI) -lcurl -llog -ldl
#LOCAL_STATIC_LIBRARIES := $(LOCAL_PATH)/$(TARGET_ARCH_ABI)/libcurl.a

#LOCAL_SHARED_LIBRARIES := Test

include $(BUILD_SHARED_LIBRARY)
#include $(BUILD_STATIC_LIBRARY)

工程目录结构如下（x86 x86_64测试工程就没包含了）
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6:lib库下载地址
https://download.csdn.net/download/yunteng521/86517151

# android # https # android studio # java # 网络
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