由于项目需要在NDK中使用网络开发，对于c语言网络开发来说，libcurl库是个很不错的选择，但android系统中并没有自带该库，所以就得自己移植了。

下面是移植步骤：

1.  下载curl源码
我这里下载的是curl-7.22.0，源码下载地址为：http://curl.haxx.se/download.html

2. 准备android源码编译环境，

android源码应已全部编译过，具体细节这里不详述，我这里使用的是android2.2 froyo源码树。

3.  在android中编译curl
在最新的curl源码里其实已经带有Android.mk这个编译文件了，而且在这文件的开头注释部分比较详细地介绍编译方法。

1）拷贝curl源码至android源码树下的external/curl

2）cd 到 external/curl目录下，输入（红色字部分根据自己的环境做相应的更改）：

ANDROID_HOME=/home/braincol/workspace/android/froyo && \

NDK_HOME=/home/braincol/workspace/android/froyo/ndk && \

PATH="$ANDROID_HOME/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/bin:$PATH" \

./configure --host=arm-linux CC=arm-eabi-gcc --with-random=/dev/urandom \

CPPFLAGS="-I$NDK_HOME/platforms/android-8/arch-arm/usr/include \

-I $ANDROID_HOME/external/curl/include/  \

-I $ANDROID_HOME/external/curl/3rd/include   \

-I $ANDROID_HOME/external/curl   \

-I $ANDROID_HOME/out/target/product/generic/obj/STATIC_LIBRARIES/libcurl_intermediates   \

-I $ANDROID_HOME/dalvik/libnativehelper/include/nativehelper   \

-I $ANDROID_HOME/system/core/include   \

-I $ANDROID_HOME/hardware/libhardware/include   \

-I $ANDROID_HOME/hardware/libhardware_legacy/include   \

-I $ANDROID_HOME/hardware/ril/include   \

-I $ANDROID_HOME/dalvik/libnativehelper/include   \

-I $ANDROID_HOME/frameworks/base/include   \

-I $ANDROID_HOME/frameworks/base/opengl/include   \

-I $ANDROID_HOME/frameworks/base/native/include   \

-I $ANDROID_HOME/external/skia/include   \

-I $ANDROID_HOME/out/target/product/generic/obj/include   \

-I $ANDROID_HOME/bionic/libc/arch-arm/include   \

-I $ANDROID_HOME/bionic/libc/include   \

-I $ANDROID_HOME/bionic/libstdc++/include   \

-I $ANDROID_HOME/bionic/libc/kernel/common   \

-I $ANDROID_HOME/bionic/libc/kernel/arch-arm   \

-I $ANDROID_HOME/bionic/libm/include   \

-I $ANDROID_HOME/bionic/libm/include/arch/arm   \

-I $ANDROID_HOME/bionic/libthread_db/include \

-include $ANDROID_HOME/system/core/include/arch/linux-arm/AndroidConfig.h \

-I $ANDROID_HOME/system/core/include/arch/linux-arm/ \

-D__ARM_ARCH_5__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5TE__ -DANDROID -DNDEBUG -DNDEBUG -DHAVE_CONFIG_H" \

CFLAGS="-fno-exceptions -Wno-multichar -msoft-float -fpic -ffunction-sections \

-funwind-tables -fstack-protector -Wa,--noexecstack -Werror=format-security \

-fno-short-enums -march=armv5te -mtune=xscale  -Wno-psabi -mthumb-interwork  \

-fmessage-length=0 -W -Wall -Wno-unused -Winit-self -Wpointer-arith \

-Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point  \

-g -Wstrict-aliasing=2 -finline-functions -fno-inline-functions-called-once \

-fgcse-after-reload -frerun-cse-after-loop -frename-registers  -UDEBUG \

-mthumb -Os -fomit-frame-pointer -fno-strict-aliasing -finline-limit=64   \

-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"  \

LIBS="-nostdlib -Bdynamic -Wl,-T,$ANDROID_HOME/build/core/armelf.x \

-Wl,-dynamic-linker,/system/bin/linker -Wl,--gc-sections -Wl,-z,nocopyreloc \

-L$ANDROID_HOME/out/target/product/generic/obj/lib -Wl,-z,noexecstack \

-Wl,-rpath-link=$ANDROID_HOME/out/target/product/generic/obj/lib \

-lc -llog -lcutils -lstdc++ \

-Wl,--no-undefined $ANDROID_HOME/prebuilt/linux-x86/toolchain/arm-eabi-4.4.0/lib/gcc/arm-eabi/4.4.0/libgcc.a  \

$ANDROID_HOME/out/target/product/generic/obj/lib/crtend_android.o \

-lm $ANDROID_HOME/out/target/product/generic/obj/lib/crtbegin_dynamic.o \

-L$ANDROID_HOME/external/curl/3rd/libs"

如果$ANDROID_HOME目录下没有ndk的开发包，那么到google的官网上下载一个放进去就行了。

3）cd 到源码根目录 mmm extern/libcurl：

编译完成之后，会生成静态库：out/target/product/generic/obj/STATIC_LIBRARIES/libcurl_intermediates/libcurl.a  。

4）如果要生成动态库需要修改curl下的Android.mk ：
LOCAL_PRELINK_MODULE := false
LOCAL_MODULE:= libcurl
LOCAL_MODULE_TAGS := optional
# Copy the licence to a place where Android will find it.
# Actually, this doesn't quite work because the build system searches
# for NOTICE files before it gets to this point, so it will only be seen
# on subsequent builds.
ALL_PREBUILT += $(LOCAL_PATH)/NOTICE
$(LOCAL_PATH)/NOTICE: $(LOCAL_PATH)/COPYING | $(ACP)
$(copy-file-to-target)
#include $(BUILD_STATIC_LIBRARY)
include $(BUILD_SHARED_LIBRARY)

4.  在android中测试curl
1）在android froyo源码树中下建立一个mytest目录，该目录下再建立一个curltest目录。

2）在目录curtest下创建curl-test.cpp：

#include "curl/curl.h"
#include <stdio.h>;
int main() { 
    CURL *curl; 
    CURLcode res;

    curl_global_init(CURL_GLOBAL_ALL);

    curl = curl_easy_init();
    if (curl) {     
        curl_easy_setopt(curl, CURLOPT_URL, "http://www.cnblogs.com/hibraincol/"); 
        res = curl_easy_perform(curl); 
        if (0!=res) {      
            printf("curl error: %d\n", res);         
        }
        
        curl_easy_cleanup(curl);     
    }   

    curl_global_cleanup();
    return 0;
}

   

3）在目录curtest下创建Android.mk：

# curl test executable
#
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_C_INCLUDES += \
    $(LOCAL_PATH)/3rd/include

LOCAL_SRC_FILES:= curl-test.cpp

# No shared libraries.
LOCAL_SHARED_LIBRARIES :=

# No static libraries.
LOCAL_STATIC_LIBRARIES := libcurl

LOCAL_MODULE := curl-test
include $(BUILD_EXECUTABLE)

4）把libcurl的头文件拷贝到curtest目录下的3rd/include目录下：
cp -rf out/target/product/generic/obj/include/libcurl/curl  mytest/curltest/3rd/include

5）到android源码树的根目录下：mmm /mytest/curltest/

braincol@ubuntu:~/workspace/android/froyo$ mmm mytest/curltest/
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=2.2
TARGET_PRODUCT=generic
TARGET_BUILD_VARIANT=eng
TARGET_SIMULATOR=
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
HOST_ARCH=x86
HOST_OS=linux
HOST_BUILD_TYPE=release
BUILD_ID=MASTER
============================================
make: Entering directory `/home/braincol/workspace/android/froyo'
target thumb C++: curl-test <= mytest/curltest/curl-test.cpp
mytest/curltest/curl-test.cpp:2:19: warning: extra tokens at end of #include directive
target Executable: curl-test (out/target/product/generic/obj/EXECUTABLES/curl-test_intermediates/LINKED/curl-test)
target Non-prelinked: curl-test (out/target/product/generic/symbols/system/bin/curl-test)
target Strip: curl-test (out/target/product/generic/obj/EXECUTABLES/curl-test_intermediates/curl-test)
Install: out/target/product/generic/system/bin/curl-test
make: Leaving directory `/home/braincol/workspace/android/froyo'

可以看到在out/target/product/generic/system/bin/下生成了curl-test这个测试程序。

6）将curl-test拷贝到真机或者模拟器中运行。

  a.我这里是在android真机的根目录下建立了一个test目录.

  b.然后通过adb push将curl-test拷贝到该目录下，并更改curl-test为可执行权限：chmod 777 curl-test.

  c. adb shell 进入shell控制台，然后cd到test目录下， ./curl-test  执行，可以看到打印出的网页源码，移植成功。

这样在之后的android app开发中，如果需要用到libcurl的库，就可以直接out/target/product/generic/obj/include/libcurl/curl里的头文件和out/target/product/generic/obj/STATIC_LIBRARIES/libcurl_intermediates/libcurl.a拿到app工程中去用就行了。