本文详细记录了使用Android NDK同时编译libxml2和libiconv库的过程，包括目录结构搭建、配置文件编写、解决编译过程中遇到的各种错误，并最终实现了库文件的正确调用。
使用Android NDK同时编译libxml2和libiconv库
首先做好准备工作按照如下创建好目录并准备好libiconv和libxml2的压缩文件
（我这里使用的版本为：libiconv-1.14.tar.gz libxml2-git-snapshot.tar.gz【libxml2-2.8.0】）
创建目录如下
buildlibxml2(root)
jni->Android.mk (root-child)
jni->main.c (root-child)
libiconv (root-child)
libxml2 (root-child)
Android.mk文件如下：
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := main
LOCAL_SRC_FILES := main.c
LOCAL_C_INCLUDES := \
$(LOCAL_PATH)/libxml2/include \
$(LOCAL_PATH)/libxml2/include/libxml \
$(LOCAL_PATH)/libiconv/include \
$(LOCAL_PATH)/libiconv \
$(LOCAL_PATH)/libiconv/libcharset \
$(LOCAL_PATH)/libiconv/lib \
$(LOCAL_PATH)/libiconv/libcharset/include
LOCAL_SHARED_LIBRARIES := libiconv libxml2
include $(BUILD_EXECUTABLE)
include $(call all-makefiles-under,$(LOCAL_PATH))
main.c 文件如下
#include <stdio.h>
#include <stdlib.h>
#include "libxml2/include/libxml/parser.h"
#include "libxml2/include/libxml/tree.h"
int main (int argc, char **argv)
{
xmlDocPtr pdoc = NULL;
xmlNodePtr proot_node = NULL,pnode = NULL,pnode1 = NULL;
pdoc = xmlNewDoc (BAD_CAST "1.0");
proot_node = xmlNewNode (NULL, BAD_CAST "root node");
xmlNewProp (proot_node, BAD_CAST "version", BAD_CAST "1.0");
xmlDocSetRootElement (pdoc, proot_node);
pnode = xmlNewNode (NULL, BAD_CAST "child node 1");
xmlNewChild (pnode, NULL, BAD_CAST "child child node 1", BAD_CAST "info");
xmlAddChild (proot_node, pnode);
pnode1 = xmlNewNode (NULL, BAD_CAST "child child node 1");
xmlAddChild (pnode, pnode1);
xmlAddChild (pnode1,xmlNewText (BAD_CAST "this will lower node, child child child node 1"));
xmlNewTextChild (proot_node, NULL, BAD_CAST "child node 2", BAD_CAST "child node 2 info");
xmlNewTextChild (proot_node, NULL, BAD_CAST "child node 3", BAD_CAST "child node info 3");
xmlSaveFormatFileEnc (argc > 1 ? argv[1]:"-", pdoc, "UTF-8", 1);
xmlFreeDoc (pdoc);
xmlCleanupParser ();
xmlMemoryDump ();
return 0;
}
将libiconv库和libxml2用tar xvvzf 命令解压
进入终端 进入libiconv目录
./configure --build=x86_64-pc-linux-gnu --host=arm-linux-eabi
进入libxml2目录
./configure (用上面的命令卡到某个步骤因此用这个)
在libiconv和libxml2文件夹里面添加Android.mk文件文件分别为
libiconv Android.mk:
LOCAL_PATH:= $(call my-dir)
#libiconv.so
include $(CLEAR_VARS)
LOCAL_MODULE := libiconv
LOCAL_CFLAGS := \
-Wno-multichar \
-DANDROID \
-DLIBDIR="c" \
-DBUILDING_LIBICONV \
-DIN_LIBRARY
LOCAL_SRC_FILES := \
libcharset/lib/localcharset.c \
lib/iconv.c \
lib/relocatable.c
LOCAL_C_INCLUDES += \
$(LOCAL_PATH)/include \
$(LOCAL_PATH)/libcharset \
$(LOCAL_PATH)/lib \
$(LOCAL_PATH)/libcharset/include \
$(LOCAL_PATH)/srclib
include $(BUILD_SHARED_LIBRARY)
libxml2 Android.mk:
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := \
c14n.c catalog.c chvalid.c debugXML.c dict.c DOCBparser.c \
encoding.c entities.c error.c globals.c hash.c HTMLparser.c \
HTMLtree.c legacy.c list.c nanoftp.c nanohttp.c parser.c \
parserInternals.c pattern.c relaxng.c SAX.c SAX2.c \
threads.c tree.c trionan.c triostr.c uri.c valid.c\
xinclude.c xlink.c xmlIO.c xmlmemory.c xmlmodule.c \
xmlreader.c xmlregexp.c xmlsave.c xmlschemas.c xmlschemastypes.c xmlstring.c \
xmlunicode.c xmlwriter.c xpath.c xpointer.c
LOCAL_C_INCLUDES := \
$(LOCAL_PATH)/include \
$(LOCAL_PATH)/include/libxml \
$(LOCAL_PATH)/../libiconv/include \
$(LOCAL_PATH)/../libiconv \
$(LOCAL_PATH)/../libiconv/libcharset \
$(LOCAL_PATH)/../libiconv/lib \
$(LOCAL_PATH)/../libiconv/libcharset/include
LOCAL_MODULE:=libxml2
LOCAL_SHARED_LIBRARIES :=libiconv
include $(BUILD_SHARED_LIBRARY)
打开终端进入buildlibxml2目录 进行ndk-build
报错 langinfo.h No such file or directiory
查找原因查看文件 \buildlibxml2\jni\libiconv\libcharset\lib\localcharset.c
# if HAVE_LANGINFO_CODESET
# include <langinfo.h>
# else
# if 0 /* see comment below */
# include <locale.h>
# endif
# endif
解决方法将\buildlibxml2\jni\libiconv\libcharset\config.h里面
将HAVE_LANGINFO_CODESET定义改成 0
#define HAVE_LANGINFO_CODESET 0
报错
'c'undeclared identitfier
查找原因查看文件 \buildlibxml2\jni\libiconv\libcharset\lib\localcharset.c
搜索int c
将int c的定义移到get_charset_aliases函数的开头
报错 ansidecl.h No such file or directiory
查找原因查看文件\buildlibxml2\jni\libxml2\include\libxml\xmlversion.h
#ifdef HAVE_ANSIDECL_H
#include <ansidecl.h>
#endif
解决方法打开文件\buildlibxml2\jni\libxml2\config.h
将define HAVE_ANSIDECL_H注释
//#define HAVE_ANSIDECL_H 1
报各类的如gzdopen gzopen 未定义的问题
将\buildlibxml2\jni\libxml2\config.h
HAVE_LIBZ 和HAVE_ZLIB_H
//#define HAVE_LIBZ 1
//#define HAVE_ZLIB_H 1
注释
报错 rand_r未定义
查找原因查看文件\buildlibxml2\jni\libxml2\dict.c
#ifdef HAVE_RAND_R
rand_seed = time(NULL);
rand_r(& rand_seed);
#else
srand(time(NULL));
#endif
#ifdef HAVE_RAND_R
ret = rand_r(& rand_seed);
#else
ret = rand();
#endif
解决方法打开文件\buildlibxml2\jni\libxml2\config.h
将HAVE_RAND_R 定义注释
//#define HAVE_RAND_R 1
重新ndk-build完成成功编译
编译这2个库我只遇到以上的一些问题。还是很幸运。编译好了！准备去用一下看可以用不痛苦的是我编译的可执行文件用cygwin在windows不能直接用- -#哎！悲哀
直接是说cannot execute binary file
然后我就在linux下用也是一样。。。不能执行二进制文件
然后我push到android模拟器上看能不能用./main运行..悲催permission denied 没有权限
你叫我情何以堪....是不是要root模拟器....
试了一下一个命令
adb remount
adb shell
mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system
cd /system/bin
cat sh > su
chmod 4755 su
su
发现不行 算了
还是好好的改JNI连接测试了。
哈哈哈！！
主activity：
package build.libxml2;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
public class testActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
TextView tv=new TextView(this);
tv.setText("开始程序运行了！");
Log.v("1", "程序开始了！");
setContentView(tv);
tv.setText("开始运行xmltest()了！");
Log.v("1", "开始运行xmltest()了");
natives.xmltest();
}
}
natives.class
package build.libxml2;
import android.util.Log;
public class natives {
static
{
Log.v("loadlibrary","start load iconv");
System.loadLibrary("iconv");
Log.v("loadlibrary","succse load iconv");
Log.v("loadlibrary","start load xml2");
System.loadLibrary("xml2");
Log.v("loadlibrary","succse load xml2");
Log.v("loadlibrary","start load main");
System.loadLibrary("main");
Log.v("loadlibrary","succse load main");
}
public static native void xmltest();
}
将main.c文件修改
#include <stdio.h>
#include <stdlib.h>
#include "libxml2/include/libxml/parser.h"
#include "libxml2/include/libxml/tree.h"
#include <jni.h>
#include <android/log.h>
JNIEXPORT void JNICALL Java_build_libxml2_natives_xmltest
(JNIEnv *env, jclass jc)
{
int i;
__android_log_print(ANDROID_LOG_INFO,"FILE_OPT","run to testmain");
i=testmain();
__android_log_print(ANDROID_LOG_INFO,"FILE_OPT","fun return %d",i);
}
//int main (int argc, char **argv)
int testmain()
{
char *szDocName="/mnt/sdcard/yy.xml";
FILE *fp;
fp=fopen(szDocName,"a+");
if(fp == NULL)
{
fclose(fp);
return 0;
}
__android_log_print(ANDROID_LOG_INFO,"FILE_OPT","file create");
xmlDocPtr pdoc = NULL;
xmlNodePtr proot_node = NULL,pnode = NULL,pnode1 = NULL;
pdoc = xmlNewDoc (BAD_CAST "1.0");
proot_node = xmlNewNode (NULL, BAD_CAST "root node");
xmlNewProp (proot_node, BAD_CAST "version", BAD_CAST "1.0");
xmlDocSetRootElement (pdoc, proot_node);
pnode = xmlNewNode (NULL, BAD_CAST "child node 1");
xmlNewChild (pnode, NULL, BAD_CAST "child child node 1", BAD_CAST "info");
xmlAddChild (proot_node, pnode);
pnode1 = xmlNewNode (NULL, BAD_CAST "child child node 1");
xmlAddChild (pnode, pnode1);
xmlAddChild (pnode1,xmlNewText (BAD_CAST "this will lower node, child child child node 1"));
xmlNewTextChild (proot_node, NULL, BAD_CAST "child node 2", BAD_CAST "child node 2 info");
xmlNewTextChild (proot_node, NULL, BAD_CAST "child node 3", BAD_CAST "child node info 3");
//xmlSaveFormatFileEnc (argc > 1 ? argv[1]:"-", pdoc, "UTF-8", 1);
xmlSaveFormatFileEnc(szDocName,pdoc, "UTF-8", 1);
xmlFreeDoc (pdoc);
xmlCleanupParser ();
xmlMemoryDump ();
return 0;
}
将\buildlibxml2\jni\Android.mk文件修改
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := main
LOCAL_SRC_FILES := main.c
LOCAL_C_INCLUDES := \
$(LOCAL_PATH)/libxml2/include \
$(LOCAL_PATH)/libxml2/include/libxml \
$(LOCAL_PATH)/libiconv/include \
$(LOCAL_PATH)/libiconv \
$(LOCAL_PATH)/libiconv/libcharset \
$(LOCAL_PATH)/libiconv/lib \
$(LOCAL_PATH)/libiconv/libcharset/include
LOCAL_SHARED_LIBRARIES := libiconv libxml2
LOCAL_LDLIBS := -llog
include $(BUILD_SHARED_LIBRARY)
include $(call all-makefiles-under,$(LOCAL_PATH))
进入终端进入目录buildlibxml2 ndk-build
成功生成
在AndroidManifest.xml添加文件访问权限
运行程序。
用adb pull 命令 将/mnt/sdcard/yy.xml拷出来
用notepad查看
<?xml version="1.0" encoding="UTF-8"?>
<root node version="1.0">
<child node 1>
<child child node 1>info</child child node 1>
<child child node 1>this will lower node, child child child node 1</child child node 1>
</child node 1>
<child node 2>child node 2 info</child node 2>
<child node 3>child node info 3</child node 3>
</root node>
测试的例子是在网上广为流传的借用然后改写了。具体链接记不起了！
移植这个库参考了一些其他的博客知识但大多是自己撰写和整编。
成功！！！！测试成功至此libxml2和libiconv成功移植到android
转载于:https://blog.51cto.com/laoyin/935912
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