參考文章：
1.NDK環境配置 http://blog.csdn.net/smfwuxiao/article/details/6587709
2.libcurl的配置修改 http://piggyq.com/pen/compile-libcurl-and-openssl-on-android-using-ndk.html

假設已經編譯好了openssl,並且安裝目錄（標頭檔案和庫的所在的目錄）為openssl-android

第一步：配置NDK環境（包括系統環境SYSROOT和編譯器CC）
android ndk 提供指令碼，允許自己定製一套工具鏈。例如：
$NDK/build/tools/make-standalone-toolchain.sh --platform=android-5 --install-dir=/tmp/my-android-toolchain [ --arch=x86 ]
將會在/tmp/my-android-toolchain 中建立 sysroot 環境和 工具鏈。--arch 選項選擇目標程式的指令

架構，預設是為 arm。
如果不加 --install-dir 選項，則會建立 /tmp/ndk/<toolchain-name>.tar.bz2。
(執行 make-standalone-toolchain.sh --help 檢視幫助。)
執行之後，這樣使用：
$ export PATH=/tmp/my-android-toolchain/bin:$PATH
$ export CC=arm-linux-androideabi-gcc
$ export CXX=arm-linux-androideabi-g++
$ export CXXFLAGS="-lstdc++"
執行完以上設定環境變數

的命令之後，就可以直接編譯了（例如，執行 ./configure 然後 make 得到的就是 arm 程式了）。
不用再設定 sysroot, CC 了。而且，可以使用 STL，異常，RTTI。

第二步：配置libcurl
進入curl根目錄，執行./configure --host=arm-linux-androideabi --with-ssl=/openssl-android
為了保證生成的配置檔案正確，需要手動確認一下，開啟lib/curl_config.h，
開啟巨集定義HAVE_LIBSSL、 HAVE_OPENSSL_CRYPTO_H、HAVE_OPENSSL_ERR_H、HAVE_OPENSSL_PEM_H、 HAVE_OPENSSL_PKCS12_H、
HAVE_OPENSSL_RSA_H、HAVE_OPENSSL_SSL_H、 HAVE_OPENSSL_X509_H、USE_OPENSSL、USE_SSLEAY
（但是注意android沒有編譯openssl中的 ，因此不要開啟巨集定義HAVE_OPENSSL_ENGINE_H），
同時註釋掉巨集定義HAVE_MALLOC_H和HAVE_IOCTL， 這兩個巨集定義在Android_config.h中有定義，
不註釋的話在編譯過程中會有很多警告（但是能正確編譯通過）

第三步：編譯Libcurl
修改Android.mk，刪除我們不需要的curl模組，在LOCAL_C_INCLUDES變數的值中增加openssl-android/include和openssl-android/crypto.
再按照以下幾種方式修改Android.mk.修改完後，將所在目錄package/Android改為package/jni，使用終端進入package，然後執行ndk-build即可。
1.編譯ARM版的（依賴openssl的共享庫）
先在libcurl前增加動態庫模組，使libssl.so等拷貝到正確位置，如下。
LOCAL_PATH:= $(call my-dir)/../..
common_CFLAGS := -Wpointer-arith -Wwrite-strings -Wunused -Winline -Wnested-externs -Wmissing-declarations -Wmissing-prototypes -Wno-long-long -Wfloat-equal -Wno-multichar -Wsign-compare -Wno-format-nonliteral -Wendif-labels -Wstrict-prototypes -Wdeclaration-after-statement -Wno-system-headers -DHAVE_CONFIG_H

#using libssl.so
include $(CLEAR_VARS) 
LOCAL_MODULE := libssl
LOCAL_SRC_FILES := /home/administrator/openssl-android/libs/armeabi/libssl.so 
include $(PREBUILT_SHARED_LIBRARY)

#using libcrypto.so
include $(CLEAR_VARS) 
LOCAL_MODULE := libcrypto
LOCAL_SRC_FILES :=/home/administrator/openssl-android/libs/armeabi/libcrypto.so 
include $(PREBUILT_SHARED_LIBRARY)

# Build the libcurl library

include $(CLEAR_VARS)
include $(LOCAL_PATH)/lib/Makefile.inc
CURL_HEADERS := \
curlbuild.h \
curl.h \
curlrules.h \
curlver.h \
easy.h \
mprintf.h \
multi.h \
stdcheaders.h \
typecheck-gcc.h

LOCAL_SRC_FILES := $(addprefix lib/,$(CSOURCES))
LOCAL_C_INCLUDES += $(LOCAL_PATH)/include/\
$(LOCAL_PATH)/lib/\
$(LOCAL_PATH)/../openssl-android/include/\
$(LOCAL_PATH)/../openssl-android/crypto/
LOCAL_SYSTEM_SHARED_LIBRARIES+= libssl libcrypto libz
LOCAL_CFLAGS += $(common_CFLAGS)

LOCAL_COPY_HEADERS_TO := libcurl/curl
LOCAL_COPY_HEADERS := $(addprefix include/curl/,$(CURL_HEADERS))

LOCAL_MODULE:= libcurl
LOCAL_MODULE_TAGS := optional

ALL_PREBUILT += $(LOCAL_PATH)/NOTICE
$(LOCAL_PATH)/NOTICE: $(LOCAL_PATH)/COPYING | $(ACP)
$(copy-file-to-target)

include $(BUILD_STATIC_LIBRARY)

2.編譯ARM版的（依賴Openssl的靜態庫）
Android.mk修改與3類似，稍微改一下靜態庫路徑即可

3.編譯x86版的（依賴openssl靜態庫）

修改Android.mk
LOCAL_PATH:= $(call my-dir)/../..
common_CFLAGS := -Wpointer-arith -Wwrite-strings -Wunused -Winline -Wnested-externs -Wmissing-declarations -Wmissing-prototypes -Wno-long-long -Wfloat-equal -Wno-multichar -Wsign-compare -Wno-format-nonliteral -Wendif-labels -Wstrict-prototypes -Wdeclaration-after-statement -Wno-system-headers -DHAVE_CONFIG_H

include $(CLEAR_VARS) 
LOCAL_MODULE := libssl
LOCAL_SRC_FILES := /home/administrator/openssl-android/obj/local/x86/libssl.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS) 
LOCAL_MODULE := libcrypto
LOCAL_SRC_FILES :=/home/administrator/openssl-android/obj/local/x86/libcrypto.a 
include $(PREBUILT_STATIC_LIBRARY)
#########################
# Build the libcurl library

include $(CLEAR_VARS)
include $(LOCAL_PATH)/lib/Makefile.inc
CURL_HEADERS := \
curlbuild.h \
curl.h \
curlrules.h \
curlver.h \
easy.h \
mprintf.h \
multi.h \
stdcheaders.h \
typecheck-gcc.h

LOCAL_SRC_FILES := $(addprefix lib/,$(CSOURCES))
LOCAL_C_INCLUDES += $(LOCAL_PATH)/include/\
$(LOCAL_PATH)/lib/\
$(LOCAL_PATH)/../openssl-android/include/\
$(LOCAL_PATH)/../openssl-android/crypto/
LOCAL_STATIC_LIBRARIES += libssl libcrypto
LOCAL_SYSTEM_SHARED_LIBRARIES += libz
LOCAL_CFLAGS += $(common_CFLAGS)

LOCAL_COPY_HEADERS_TO := libcurl/curl
LOCAL_COPY_HEADERS := $(addprefix include/curl/,$(CURL_HEADERS))

LOCAL_MODULE:= libcurl
LOCAL_MODULE_TAGS := optional

ALL_PREBUILT += $(LOCAL_PATH)/NOTICE
$(LOCAL_PATH)/NOTICE: $(LOCAL_PATH)/COPYING | $(ACP)
$(copy-file-to-target)

include $(BUILD_STATIC_LIBRARY)

在Android.mk的同目錄中增加Application.mk,並增加以下內容：
APP_ABI := x86

TARGET_ARCH := x86

------------------------------------------------------------------------------------------------------------------------------------------------

export LDFLAGS="\-L/usr/local/Cellar/android-ndk/r8e/platforms/android-14/arch-arm/usr/lib"

export CPPFLAGS="\-I/usr/local/Cellar/android-ndk/r8e/platforms/android-14/arch-arm/usr/include"

./configure --host=arm-linux-androideabi \--disable-ftp \--disable-gopher \--disable-file \--disable-imap \--disable-ldap \--disable-ldaps \--disable-pop3 \--disable-proxy \--disable-rtsp \--disable-smtp \--disable-telnet \--disable-tftp \--without-gnutls \--without-libidn \--without-librtmp \--without-ssl \--disable-dict

make

生成的靜態庫檔案位於：lib/.libs/libcurl.a 動態庫：libcurl.so.5.3.0

一般我們使用靜態庫檔案。

複製 libcurl.a 到專案 jni/ 目錄，修改 Android.mk 檔案

# A simple test for the minimal standard C++ library

#LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)LOCAL_MODULE := curl

LOCAL_SRC_FILES := libcurl.a

include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)

LOCAL_CFLAGS = -Wno-psabi

LOCAL_MODULE := curltest

LOCAL_SRC_FILES := curltest.c

LOCAL_STATIC_LIBRARIES := libcurl

LOCAL_C_INCLUDES += $(LOCAL_PATH)/include

LOCAL_LDLIBS += -lz

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https://zhigang.net/2013/08/yi-zhi-libcurldao-android-ndk.html


http://piggyq.com/pen/compile-libcurl-and-openssl-on-android-using-ndk.html


http://www.bubuko.com/infodetail-557861.html

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libcurl使用

http://blog.csdn.net/JGood/article/details/4787670

http://www.cnblogs.com/moodlxs/archive/2012/10/15/2724318.html