解析libcurl在android下的移植、编译与测试

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）：

复制代码代码如下:

	
	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 ：

复制代码代码如下:

	
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：

复制代码代码如下:

	
	#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：

复制代码代码如下:

	
	#

	 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-testinclude

	 $(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/

复制代码代码如下:

	
	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。

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解析libcurl在android下的移植、编译与测试

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