libcurl在android下的移植、編譯與測試

由於項目需要在NDK中使用網路開發，對於c語言網路開發來說，libcurl庫是個很不錯的選擇，但android系統中並沒有內建該庫，所以就得自己移植了。

下面是移植步驟：

1.  下載curl源碼
我這裡下載的是curl-7.22.0，源碼為：http://curl.haxx.se/download.html

2. 準備android源碼編譯環境，

android源碼應已全部編譯過，具體細節這裡不詳述，我這裡使用的是android2.2 froyo源碼樹。

 

3.  在android中編譯curl
在最新的curl源碼裡其實已經帶有Android.mk這個編譯檔案了，而且在這檔案的開頭注釋部分比較詳細地介紹編譯方法。

1）拷貝curl源碼至android源碼樹下的external/curl

 

2）cd 到 external/curl目錄下，輸入（紅色字部分根據自己的環境做相應的更改）：

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目錄下沒有ndk的開發包，那麼到google的官網上下載一個放進去就行了。

 

3）cd 到源碼根目錄 mmm extern/libcurl：

編譯完成之後，會產生靜態庫：out/target/product/generic/obj/STATIC_LIBRARIES/libcurl_intermediates/libcurl.a  。

 

4）如果要產生動態庫需要修改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中測試curl
1）在android froyo源碼樹中下建立一個mytest目錄，該目錄下再建立一個curltest目錄。

 

2）在目錄curtest下建立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）在目錄curtest下建立Android.mk：

# curl test executable#LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_C_INCLUDES += \    $(LOCAL_PATH)/3rd/includeLOCAL_SRC_FILES:= curl-test.cpp# No shared libraries.LOCAL_SHARED_LIBRARIES :=# No static libraries.LOCAL_STATIC_LIBRARIES := libcurlLOCAL_MODULE := curl-testinclude $(BUILD_EXECUTABLE)

4）把libcurl的標頭檔拷貝到curtest目錄下的3rd/include目錄下：

cp -rf out/target/product/generic/obj/include/libcurl/curl  mytest/curltest/3rd/include

5）到android源碼樹的根目錄下：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/下產生了curl-test這個測試程式。

6）將curl-test拷貝到真機或者模擬器中運行。

  a.我這裡是在android真機的根目錄下建立了一個test目錄.

  b.然後通過adb push將curl-test拷貝到該目錄下，並更改curl-test為可執行許可權：chmod 777 curl-test.

  c. adb shell 進入shell控制台，然後cd到test目錄下， ./curl-test  執行，可以看到列印出的網頁源碼，移植成功。

 

這樣在之後的android app開發中，如果需要用到libcurl的庫，就可以直接out/target/product/generic/obj/include/libcurl/curl裡的標頭檔和out/target/product/generic/obj/STATIC_LIBRARIES/libcurl_intermediates/libcurl.a拿到app工程中去用就行了。