JniHelper类的使用

加入如下头文件：

#include "platform/android/jni/JniHelper.h"

需要使用的接口如下：

static bool getStaticMethodInfo(JniMethodInfo &methodinfo, const char *className, const char *methodName, const char *paramCode);

static bool getMethodInfo(JniMethodInfo &methodinfo, const char *className, const char *methodName, const char *paramCode);

实现上我们只需要使用上面这两个接口，就可以获取java类的所有函数信息了。JNI环境的获取、各种错误处理都已经在这两个接口实现中封装好了。
先上代码，再来依次讲解每个参数的意义和使用方法：

    //函数信息结构体

    JniMethodInfo minfo;

    bool isHave = JniHelper::getStaticMethodInfo(minfo,/*JniMethodInfo的引用*/

                                                 "com/omega/MyApp",/*类的路径*/

                                                 "getJavaActivity",/*函数名*/

                                                 "()Ljava/lang/Object;");/*函数类型简写*/

    jobject activityObj;

    if (isHave)

    {

        //CallStaticObjectMethod调用java函数，并把返回值赋值给activityObj

        activityObj = minfo.env->CallStaticObjectMethod(minfo.classID, minfo.methodID);

    }

OK，很简单。上面的代码，就是使用JNI在C++中调用java类静态函数的典型使用方法。只有两步：

 1.获取java函数的信息，classid、methodid等等

 2.选择JNIEnv中的接口，进行函数调用

// @brief   LIU工具类

完成第一版（基于cocos2d-x 2.2.3）
移植至cocos2d-x-3.3
1.将被depreciated的函数与用法更新至3.3版本
2.更新JNI调用
3.代码整理（注释、命名等）

#ifndef __LIU_UTILS_H__
#define __LIU_UTILS_H__

#include <string>
#include "cocos2d.h"

#if(CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
#if defined(_LIUDLL)
#define LIU_DLL     __declspec(dllexport)  /* use a DLL library */
#else       
#define LIU_DLL     __declspec(dllimport)
#endif

#else
#define LIU_DLL 
#endif

class LIU_DLL LIUUtils
{
public:
// 视频播放
// @brief play a web video 
static void playVideo(const char* videoPath, bool isExternl = false, bool isHaveBtn = true, bool                    isCanBeStoped = false);
// @brief play a video with a position and size 
// if flag == true, then video can be stoped 
// if flag == false, then video can be paused and resume 
static void playVideo(const char* videoPath, int x, int y, int width, int height,bool flag);

// @brief play a video list with a position and size 
// if flag == true, then video can be stoped 
// if flag == false, then video can be paused and resume 
static void playVideoList(const char* videoPathList, int x, int y, int width, int height,bool flag);

static void setVideoVolume(float volume);
// @brief 设置视频结束后的延时时间 (单位是毫秒)
static void setVideoDelayTime(int delayTime);
// @brief 关掉视频 
static void stopVideo();
// @brief close video 
static void stopVideo(bool removeFlag);

// @brief check if the video is playing or not 
static bool isVideoPlaying();

// @brief 中文转码 
// @param gbkStr-------中文字符串 
static int GBKToUTF8(std::string &gbkStr);

static void setOrientationLandscape();

static void setOrientationPortrait();

// @brief 游戏退出弹出是否退出提示框 
// @param  message------提示语， 传NULL---默认提示与“您是否退出游戏” 
static void exitConfirm(const char* message);

/** @brief 获取SD上APK下载路径 */

static std::string LIUGetSDDownPath();

// @brief 关闭自动锁屏

static void setWakeOff();

// @brief 开启自动锁屏
static void setWakeOn();
};

#endif

// @brief   LIU工具类
// @version 1.00  2014.10 完成第一版（基于cocos2d-x 2.2.3）
// @version 1.10  2014.11 移植至cocos2d-x-3.3
//                         1.将被depreciated的函数与用法更新至3.3版本
//                         2.更新JNI调用
//                         3.代码整理（注释、命名等）


#include "LIUUtils.h"
#include "cocos2d.h"
using namespace cocos2d;

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
#include "platform/android/jni/JniHelper.h"
#endif


#if(CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
#include "external/win32-specific/icon/include/iconv.h"
#else
#include "libiconv/include/iconv.h"
#endif

void LIUUtils::playVideo( const char* videoPath, int x, int y, int width, int height,bool flag)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo,
"com/LIU/cocos2dx/lib/LIUVideoHelper",
"playVideoStatic",
"(Ljava/lang/String;IIIIZ)V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID,
methodInfo.env->NewStringUTF(videoPath),x,y,width,height,flag);
}
#endif


CCLOG("______Start to play video :%s______", videoPath);
}

void LIUUtils::playVideo(const char* videoPath, bool isExternl, bool isHaveBtn, bool isCanBeStoped)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo, 
"com/LIU/cocos2dx/lib/LIUVideoHelper",
"playVideoStatic", 
"(Ljava/lang/String;ZZZ)V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID, 
methodInfo.env->NewStringUTF(videoPath), isExternl, isHaveBtn, isCanBeStoped);
}
#endif


CCLOG("______Start to play web video :%s______", videoPath);
}


bool LIUUtils::isVideoPlaying()
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
jboolean ret = false;


if (JniHelper::getStaticMethodInfo(methodInfo, 
"com/LIU/cocos2dx/lib/LIUVideoHelper",
"isVideoPlayingStatic", 
"()Z"))
{
ret = methodInfo.env->CallStaticBooleanMethod(methodInfo.classID, methodInfo.methodID);
methodInfo.env->DeleteLocalRef(methodInfo.classID);
return ret;
}


return ret;
#else
return false;
#endif
}


void LIUUtils::stopVideo()
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo, 
"com/LIU/cocos2dx/lib/LIUVideoHelper",
"stopVideoStatic", 
"()V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID);
}
#endif
}


void LIUUtils::stopVideo(bool removeFlag)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo, 
"com/LIU/cocos2dx/lib/LIUVideoHelper",
"stopVideoStatic", 
"(Z)V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID,removeFlag);
}
#endif
}


void LIUUtils::setFullScreen(bool flag)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo,
"com/LIU/cocos2dx/lib/LIUVideoHelper",
"setFullScreenStatic",
"(Z)V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID,flag);
}
#endif


CCLOG("______Start to full screen flag :%d______", flag);
}


void LIUUtils::playVideoList( const char* videoPathList, int x, int y, int width, int height,bool flag)
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)


JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo,
"com/LIU/cocos2dx/lib/LIUVideoHelper",
"playVideoLisStatict",
"(Ljava/lang/String;IIIIZ)V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID,
methodInfo.env->NewStringUTF(videoPathList),x,y,width,height,flag);
}
#endif


CCLOG("______Start to play video :%s______", videoPathList);
}


void LIUUtils::setVideoSkipType( int type )
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo,
"com/LIU/cocos2dx/lib/LIUVideoHelper",
"setVideoSkipType",
"(I)V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID,
type);
}
#endif


CCLOG("setVideoSkipType = %d______", type);
}


void LIUUtils::setVideoDelayTime( int delayTime )
{
CCLOG("start______setVideoDelayTime = %d______", delayTime);
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo,
"com/LIU/cocos2dx/lib/LIUVideoHelper",
"setVideoDelayTime",
"(I)V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID,
delayTime);
}
#endif


CCLOG("end______setVideoDelayTime = %d______", delayTime);
}


void LIUUtils::setDelayShowSkipBtnTime( int delayShowSkipBtnTime )
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo,
"com/LIU/cocos2dx/lib/LIUVideoHelper",
"setDelayShowSkipBtnTime",
"(I)V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID,
delayShowSkipBtnTime);
}
#endif


CCLOG("-------------setDelayShowSkipBtnTime = %d______", delayShowSkipBtnTime);
}


void LIUUtils::setVideoVolume( float volume )
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo,
"com/LIU/cocos2dx/lib/LIUVideoHelper",
"setVideoVolume",
"(F)V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID,
volume);
}
#endif
}



void LIUUtils::recordFunctionBegin(const char* functionName ,const char* curActivityName ,const char* extend ,const char* moduleDetail)
{
std::string strFun(functionName), strCur(curActivityName), strEx(extend), strModu(moduleDetail);
GBKToUTF8(strFun);
GBKToUTF8(strCur);
GBKToUTF8(strEx);
GBKToUTF8(strModu);
const char* Fun = strFun.c_str();
const char* Cur = strCur.c_str();
const char* Ex = "";
const char* Modu = strModu.c_str();


#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
jboolean ret = false;


if (JniHelper::getStaticMethodInfo(methodInfo, 
"com/LIU/cocos2dx/lib/LIUBigData",
"recordFunctionBegin", 
"(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V"))
{
// ret = methodInfo.env->CallStaticBooleanMethod(methodInfo.classID, methodInfo.methodID);
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID, 
methodInfo.env->NewStringUTF(Fun), 
methodInfo.env->NewStringUTF(Cur),
methodInfo.env->NewStringUTF(Ex),
methodInfo.env->NewStringUTF(Modu));
// return ret;
}


// return ret;
#else
// return false;
#endif
}


int LIUUtils::GBKToUTF8(std::string &gbkStr)
{
iconv_t iconvH;    


iconvH              = iconv_open("utf-8","gb2312");    
if(iconvH == 0){    
return -1;    
}    
const char* strChar = gbkStr.c_str();    
const char** pin    = &strChar;    


size_t strLength    = gbkStr.length();    
if (0 == strLength)///< 特殊情况下，gbkStr为"",strLength = 0时，转码会有乱码
{
gbkStr = "";
}
else
{
char* outbuf        = (char*)malloc(strLength*4);    
char* pBuff         = outbuf;    
memset(outbuf,0,strLength*4);    
size_t outLength    = strLength*4;    
#if(CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)
if(-1 == iconv(iconvH,pin,&strLength,&outbuf,&outLength)){    
iconv_close(iconvH);    
return -1;    
} 
#else
if(-1 == iconv(iconvH,(char **)pin,&strLength,&outbuf,&outLength)){    
iconv_close(iconvH);    
return -1;    
} 
#endif


gbkStr =  pBuff; 
}


iconv_close(iconvH);    
return 0;    
}


void LIUUtils::setWakeOff()
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo, 
"com/LIU/cocos2dx/lib/LIUActivityHelper",
"setWakeOff", 
"()V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID);
}
#endif
}


void LIUUtils::setWakeOn()
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo, 
"com/LIU/cocos2dx/lib/LIUActivityHelper",
"setWakeOn", 
"()V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID);
}
#endif
}




void LIUUtils::setOrientationLandscape()
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo, 
"com/LIU/cocos2dx/lib/LIUActivityHelper",
"setOrientationLandscape", 
"()V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID);
}
#endif
}


void LIUUtils::setOrientationPortrait()
{
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo, 
"com/LIU/cocos2dx/lib/LIUActivityHelper",
"setOrientationPortrait", 
"()V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID);
}
#endif
}


void LIUUtils::exitConfirm(const char* message)
{
if(message == NULL)
{
message = "您确定要退出吗?";
}
std::string message_string(message);
GBKToUTF8(message_string);
const char* exit_message = message_string.c_str();
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
JniMethodInfo methodInfo;
if (JniHelper::getStaticMethodInfo(methodInfo, 
"com/LIU/cocos2dx/lib/LIUActivityHelper",
"exitConfirm", 
"(Ljava/lang/String;)V"))
{
methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID, 
methodInfo.env->NewStringUTF(exit_message));
}
#endif
}

/**调用java 函数
 * Activity管理类<p>
 * 包含的方法：唤醒锁设置、唤出退出框、屏幕方向设置
 */
public class XtcActivityHelper {
private static final int EXIT_MESSAGE = 5;


private static XtcActivityHelper sActivityHelper;
private Handler mExitHandler = null;
private AlertDialog.Builder mBuilder = null;
private String mExitMessage = null;


public XtcActivityHelper(final Context context) {
sActivityHelper = this;

mExitHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case EXIT_MESSAGE: {
if (mBuilder == null) {
mBuilder = new Builder(context);
mBuilder.setMessage(mExitMessage);
mBuilder.setTitle("温馨提示");
mBuilder.setPositiveButton(
"退出",
new android.content.DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,int which) {
dialog.dismiss();
OkiiDaily.exitTime(context);
android.os.Process.killProcess(android.os.Process.myPid());
}
});
mBuilder.setNegativeButton(
"取消",
new android.content.DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,int which) {
dialog.dismiss();
}
});
mBuilder.setOnDismissListener(new DialogInterface.OnDismissListener() {
@Override
public void onDismiss(DialogInterface dialog) {
mBuilder = null;
}
});
mBuilder.create().show();
}
}
break;
}
};
};
}

/** 设置屏幕方向为水平*/
public static void setOrientationLandscape() {
Cocos2dxActivity.getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}


/** 设置屏幕方向为垂直*/
public static void setOrientationPortrait() {
Cocos2dxActivity.getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}

/** 唤出退出框*/
public static void exitConfirm(String message)
{
sActivityHelper.mExitMessage = message;
Message msg = new Message();
msg.what = EXIT_MESSAGE;
sActivityHelper.mExitHandler.sendMessage(msg);
}
}