from: http://www.cocoachina.com/bbs/read.php?tid=209403



  1. C++端工作

    环境还是cocos2d-js 3.0 beta,准备给javascript加一个osInfo的函数,来判断用户的系统信息以及网络信息。

    首先在项目目录下的frameworks/runtime-src/Classes/目录添加jsb_os_info.hpp,内容如下:

    #include "cocos2d_specifics.hpp"  
    #include "cocos2d.h"

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

    /**c++调用java中的方法*/
    std::string call_java() {
        cocos2d::JniMethodInfo osInfoBoard;

        bool isHave = cocos2d::JniHelper::getStaticMethodInfo(
            osInfoBoard,
            "org/cocos2dx/javascript/AppActivity", // 改的话对应frameworks/runtime-src/proj.android/src下修改
            "osInfoBoardStatic",
            "()Ljava/lang/String;"
        );
        if (!isHave) {
            cocos2d::CCLog("jni:osInfoBoardStatic false");
            return NULL;
        }

        jstring jstr = (jstring)osInfoBoard.env->CallStaticObjectMethod(osInfoBoard.classID, osInfoBoard.methodID);
        return cocos2d::JniHelper::jstring2string(jstr);
    }

    /**定义用来处理js请求的函数:
    *cx:JS的上下文
    *argc:参数的个数
    *vp:具体的参数列表
    */
    bool jsb_os_info(JSContext *cx, uint32_t argc, JS::Value *vp) {
        jsval ret = std_string_to_jsval(cx, call_java());
        JS_SET_RVAL(cx, vp, ret);

        return true;
    }

    /**在AppDelegate.cpp中被注册的函数:sc->addRegisterCallback(register_jsb_os_info);*/
    void register_jsb_os_info(JSContext* cx, JSObject* obj) {    
        //绑定:“osInfo”为开发给js调用的方法
        JS_DefineFunction(cx, obj, "osInfo", jsb_os_info, 0, 0);  
    }

    然后修改同目录下AppDelegate.cpp文件,添加相应的引用和注册javascript函数:

    ...
    #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
    #include "jsb_os_info.hpp"
    #include "platform/android/CCJavascriptJavaBridge.h"
    #endif
    ...
    #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
        sc->addRegisterCallback(register_jsb_os_info);
        sc->addRegisterCallback(JavascriptJavaBridge::_js_register);
    #endif
        sc->start();
    ...

    注意顺序,其他非相关代码都省略了。

    2. java端工作

    修改项目目录frameworks/runtime-src/proj.android/src/org/cocos2dx/javascript/AppActivity.java,这个程序本来是空的,增加代码如下:

    package org.cocos2dx.javascript;

    import org.cocos2dx.lib.Cocos2dxActivity;
    import android.content.Context;
    import android.net.ConnectivityManager;
    import android.net.NetworkInfo;
    import android.net.wifi.WifiManager;
    import android.net.wifi.WifiInfo;
    import android.telephony.TelephonyManager;

    public class AppActivity extends Cocos2dxActivity {
        private static Context mContext;

        private static String formatIp(int ip) {
            return  ( ip & 0xFF ) + "." +
                    ((ip >> 8 ) & 0xFF) + "." +
                    ((ip >> 16 ) & 0xFF) + "." +
                    ((ip >> 24 ) & 0xFF) ;
        }

        public static NetworkInfo getNetworkInfo(Context context){
            ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            return cm.getActiveNetworkInfo();
        }

        public static boolean isConnected(Context context){
            NetworkInfo info = AppActivity.getNetworkInfo(context);
            return (info != null && info.isConnected());
        }

        public static String getWifi(Context context){
            NetworkInfo info = AppActivity.getNetworkInfo(context);
            if (info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_WIFI) {
                WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
                WifiInfo wifiInfo = wifiManager.getConnectionInfo();

                return "Wifi|" + WifiManager.calculateSignalLevel(wifiInfo.getRssi(), 10) + "|" + wifiInfo.getLinkSpeed();
            } else {
                return "";
            }
        }

        public static String getMobile(Context context){
            NetworkInfo info = AppActivity.getNetworkInfo(context);
            if (info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_MOBILE) {
                String mobileType = AppActivity.getMobileType(info.getSubtype());

                return "Mobile|" + mobileType;
            } else {
                return "";
            }
        }

        public static String getMobileType(int subType){
            switch(subType){
                case TelephonyManager.NETWORK_TYPE_1xRTT:
                    return "1xRTT"; // ~ 50-100 kbps
                case TelephonyManager.NETWORK_TYPE_CDMA:
                    return "CDMA"; // ~ 14-64 kbps
                case TelephonyManager.NETWORK_TYPE_EDGE:
                    return "EDGE"; // ~ 50-100 kbps
                case TelephonyManager.NETWORK_TYPE_EVDO_0:
                    return "EVDO_0"; // ~ 400-1000 kbps
                case TelephonyManager.NETWORK_TYPE_EVDO_A:
                    return "EVDO_A"; // ~ 600-1400 kbps
                case TelephonyManager.NETWORK_TYPE_GPRS:
                    return "GPRS"; // ~ 100 kbps
                case TelephonyManager.NETWORK_TYPE_HSDPA:
                    return "HSDPA"; // ~ 2-14 Mbps
                case TelephonyManager.NETWORK_TYPE_HSPA:
                    return "HSPA"; // ~ 700-1700 kbps
                case TelephonyManager.NETWORK_TYPE_HSUPA:
                    return "HSUPA"; // ~ 1-23 Mbps
                case TelephonyManager.NETWORK_TYPE_UMTS:
                    return "UMTS"; // ~ 400-7000 kbps
                /*
                 * Above API level 7, make sure to set android:targetSdkVersion
                 * to appropriate level to use these
                 */
                //case TelephonyManager.NETWORK_TYPE_EHRPD: // API level 11
                case 14:
                    return "EHRPD"; // ~ 1-2 Mbps
                case TelephonyManager.NETWORK_TYPE_EVDO_B: // API level 9
                    return "EVDO_B"; // ~ 5 Mbps
                //case TelephonyManager.NETWORK_TYPE_HSPAP: // API level 13
                case 15: // TelephonyManager.NETWORK_TYPE_HSPAP
                    return "HSPAP"; // ~ 10-20 Mbps
                case TelephonyManager.NETWORK_TYPE_IDEN: // API level 8
                    return "IDEN"; // ~25 kbps
                //case TelephonyManager.NETWORK_TYPE_LTE: // API level 11
                case 13: // TelephonyManager.NETWORK_TYPE_LTE
                    return "LTE"; // ~ 10+ Mbps
                // Unknown
                case TelephonyManager.NETWORK_TYPE_UNKNOWN:
                default:
                    return "UNKNOWN";
            }
        }

        public static String getProvidersName(Context context) {
            try {
                TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
                String operator = telephonyManager.getSimOperator();
                if (operator == null || operator.equals("")) {
                    return "unknown";
                }

                if (operator.startsWith("46000") || operator.startsWith("46002")) {
                    return "cm";
                } else if (operator.startsWith("46001")) {
                    return "cu";
                } else if (operator.startsWith("46003")) {
                    return "ct";
                } else {
                    return "unknown";
                }
            } catch (Exception e) {
                return "error";
            }
        }

        public static String osInfoBoardStatic() {
            mContext = AppActivity.getContext();
            String info = android.os.Build.MODEL + "|Android|" + android.os.Build.VERSION.RELEASE + "|" + AppActivity.getProvidersName(mContext) + "|";
            String str = "";

            if (!AppActivity.isConnected(mContext)) {
                return info + "Disconnected";
            } else {
                str = AppActivity.getWifi(mContext);
                if (str != "") {
                    return info + str;
                }

                str = AppActivity.getMobile(mContext);
                if (str != "") {
                    return info + str;
                } else {
                    return info + "Unknown";
                }
            }
        }
    }

    因为判断4G的TelephonyManager.NETWORK_TYPE_LTE属于API level 11,用这个定义写法,编译无法通过(默认编译是API level 10,最低可以是API level 9),所以这里写了硬编码。

    3. 配置文件修改

    修改项目目录frameworks/runtime-src/proj.android/jni/Android.mk文件,加上jsb_os_info.hpp:

    ...
    LOCAL_SRC_FILES := hellojavascript/main.cpp \
                       ../../Classes/jsb_os_info.hpp \
                       ../../Classes/AppDelegate.cpp
    ...
    然后重新编译就可以在jsb环境下,用javascript执行osInfo这个函数。

    4. javascript端执行效果

    Wifi和手机上网状态,用javascript的osInfo函数返回分别是这样的:

    vivo Xplay3S|Android|4.3|cm|Wifi|4|39
    vivo Xplay3S|Android|4.3|cm|Mobile|LTE

    主要是游戏对网络比较敏感,所以判断了是Wifi上网还是手机上网,Wifi还判断了信号强度以及连接速率,手机上网判断是哪种上网方式。

    5. 反射机制调用

    就在文档写到尾声的时候,在英文论坛突然发现这篇文档:

    https://github.com/joshuastray/cocos-docs/blob/master/manual/framework/html5/v3/reflection/zh.md

    有点无语,白白多花了几个小时,原来世界这么简单。强烈呼吁cocos2d-js团队的童鞋有文档就先在论坛里扔一下,小白鼠们都会抢着去测试的。

    PS. IOS下javascript调用Objective-C有没有方便的方法?还是得普通jsb方式调用?

6. 参考文档

【集成友盟社会化SDK】COCOS2D-JS3.0ALPHA2中JAVA/C++/JAVASCRPIT 三方交互的实现
http://www.asmld.com/?p=113

3.jni_c++调用java中的方法
http://banshaotang.iteye.com/blog/2078501

cocos2d-x 使用JniHelper 调用 java代码 获取安卓生成的唯一标示UUID
http://blog.csdn.net/yxiaom/article/details/17137479