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 *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
static void playVideoList(const char* videoPathList,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,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,"(Ljava/lang/String;ZZZ)V")) { methodInfo.env->CallStaticVoidMethod(methodInfo.classID,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,"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,"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,"(Z)V")) { methodInfo.env->CallStaticVoidMethod(methodInfo.classID,removeFlag); } #endif } void LIUUtils::setFullScreen(bool flag) { #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) JniMethodInfo methodInfo; if (JniHelper::getStaticMethodInfo(methodInfo,"setFullScreenStatic",flag); } #endif CCLOG("______Start to full screen flag :%d______",flag); } void LIUUtils::playVideoList( const char* videoPathList,bool flag) { #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) JniMethodInfo methodInfo; if (JniHelper::getStaticMethodInfo(methodInfo,"playVideoLisStatict",methodInfo.env->NewStringUTF(videoPathList),videoPathList); } void LIUUtils::setVideoSkipType( int type ) { #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) JniMethodInfo methodInfo; if (JniHelper::getStaticMethodInfo(methodInfo,"setVideoSkipType","(I)V")) { methodInfo.env->CallStaticVoidMethod(methodInfo.classID,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,"setVideoDelayTime",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,"setDelayShowSkipBtnTime",delayShowSkipBtnTime); } #endif CCLOG("-------------setDelayShowSkipBtnTime = %d______",delayShowSkipBtnTime); } void LIUUtils::setVideoVolume( float volume ) { #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) JniMethodInfo methodInfo; if (JniHelper::getStaticMethodInfo(methodInfo,"setVideoVolume","(F)V")) { methodInfo.env->CallStaticVoidMethod(methodInfo.classID,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.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,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,&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",methodInfo.methodID); } #endif } void LIUUtils::setWakeOn() { #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) JniMethodInfo methodInfo; if (JniHelper::getStaticMethodInfo(methodInfo,"setWakeOn",methodInfo.methodID); } #endif } void LIUUtils::setOrientationLandscape() { #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) JniMethodInfo methodInfo; if (JniHelper::getStaticMethodInfo(methodInfo,"setOrientationLandscape",methodInfo.methodID); } #endif } void LIUUtils::setOrientationPortrait() { #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) JniMethodInfo methodInfo; if (JniHelper::getStaticMethodInfo(methodInfo,"setOrientationPortrait",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,"exitConfirm","(Ljava/lang/String;)V")) { methodInfo.env->CallStaticVoidMethod(methodInfo.classID,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",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); } }