Android NDK移植libiconv和libxml2

使用Android NDK同時編譯libxml2和libiconv庫
首先做好準備工作按照如下建立好目錄並準備好libiconv和libxml2的壓縮檔
（我這裡使用的版本為：libiconv-1.14.tar.gz libxml2-git-snapshot.tar.gz【libxml2-2.8.0】）
建立目錄如下
buildlibxml2(root)
 jni->Android.mk (root-child)
 jni->main.c (root-child)
 libiconv (root-child) 
 libxml2  (root-child)
Android.mk檔案如下：
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 檔案如下
#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;
}
 
將libiconv庫和libxml2用tar xvvzf 命令解壓
進入終端 進入libiconv目錄
./configure --build=x86_64-pc-linux-gnu --host=arm-linux-eabi
進入libxml2目錄
./configure (用上面的命令卡到某個步驟因此用這個)
在libiconv和libxml2檔案夾裡面添加Android.mk檔案檔案分別為
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)
開啟終端進入buildlibxml2目錄 進行ndk-build
報錯 langinfo.h No such file or directiory
尋找原因查看檔案 \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
解決方案將\buildlibxml2\jni\libiconv\libcharset\config.h裡面
將HAVE_LANGINFO_CODESET定義改成 0
#define HAVE_LANGINFO_CODESET 0
報錯
'c'undeclared identitfier
尋找原因查看檔案 \buildlibxml2\jni\libiconv\libcharset\lib\localcharset.c
搜尋int c
將int c的定義移到get_charset_aliases函數的開頭

報錯 ansidecl.h  No such file or directiory
尋找原因查看檔案\buildlibxml2\jni\libxml2\include\libxml\xmlversion.h
#ifdef HAVE_ANSIDECL_H
#include <ansidecl.h>
#endif
解決方案開啟檔案\buildlibxml2\jni\libxml2\config.h
將define HAVE_ANSIDECL_H注釋
//#define HAVE_ANSIDECL_H 1
報各類的如gzdopen gzopen 未定義的問題
將\buildlibxml2\jni\libxml2\config.h
HAVE_LIBZ 和HAVE_ZLIB_H
//#define HAVE_LIBZ 1
//#define HAVE_ZLIB_H 1
注釋
報錯 rand_r未定義
尋找原因查看檔案\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
解決方案開啟檔案\buildlibxml2\jni\libxml2\config.h
將HAVE_RAND_R 定義注釋
//#define HAVE_RAND_R 1

重新ndk-build完成成功編譯
編譯這2個庫我只遇到以上的一些問題。還是很幸運。編譯好了！準備去用一下看可以用不痛苦的是我編譯的可執行檔用cygwin在windows不能直接用- -#哎！悲哀
直接是說cannot execute binary file
然後我就在linux下用也是一樣。。。不能執行二進位檔案
然後我push到android模擬器上看能不能用./main運行..悲催permission denied 沒有許可權
你叫我情何以堪....是不是要root模擬器....
試了一下一個命令
adb remount
adb shell
mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system
cd /system/bin
cat sh > su
chmod 4755 su
su
發現不行 算了
還是好好的改JNI串連測試了。
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("開始程式運行了！");
        Log.v("1", "程式開始了！");
        setContentView(tv);
        tv.setText("開始運行xmltest()了！");
        Log.v("1", "開始運行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();
}
將main.c檔案修改
#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;
}

將\buildlibxml2\jni\Android.mk檔案修改
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))

進入終端進入目錄buildlibxml2 ndk-build
成功產生
在AndroidManifest.xml添加檔案存取權限
運行程式。
用adb pull 命令 將/mnt/sdcard/yy.xml拷出來 
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>
測試的例子是在網上廣為流傳的借用然後改寫了。具體連結記不起了！
移植這個庫參考了一些其他的部落格知識但大多是自己撰寫和整編。
成功！！！！測試成功至此libxml2和libiconv成功移植到android