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cocos2d-js 3.0 jsb环境调用底层java代码
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‎android-jsb.md

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# cocos2d-js 3.0 jsb环境调用底层java代码
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------
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## 1. C++端工作
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------
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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。
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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：
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```
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#include "cocos2d_specifics.hpp"
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#include "cocos2d.h"
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#include <jni.h>
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#include "platform/android/jni/JniHelper.h"
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/**c++调用java中的方法*/
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std::string call_java() {
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cocos2d::JniMethodInfo osInfoBoard;
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bool isHave = cocos2d::JniHelper::getStaticMethodInfo(
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osInfoBoard,
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"org/cocos2dx/javascript/AppActivity", // 改的话对应frameworks/runtime-src/proj.android/src下修改
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"osInfoBoardStatic",
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"()Ljava/lang/String;"
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);
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if (!isHave) {
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cocos2d::CCLog("jni:osInfoBoardStatic false");
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return NULL;
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}
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jstring jstr = (jstring)osInfoBoard.env->CallStaticObjectMethod(osInfoBoard.classID, osInfoBoard.methodID);
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return cocos2d::JniHelper::jstring2string(jstr);
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}
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/**定义用来处理js请求的函数：
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*cx:JS的上下文
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*argc:参数的个数
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*vp：具体的参数列表
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*/
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bool jsb_os_info(JSContext *cx, uint32_t argc, JS::Value *vp) {
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jsval ret = std_string_to_jsval(cx, call_java());
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JS_SET_RVAL(cx, vp, ret);
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return true;
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}
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/**在AppDelegate.cpp中被注册的函数：sc->addRegisterCallback(register_jsb_os_info);*/
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void register_jsb_os_info(JSContext* cx, JSObject* obj) {
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//绑定：“osInfo”为开发给js调用的方法
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JS_DefineFunction(cx, obj, "osInfo", jsb_os_info, 0, 0);
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}
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```
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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：
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```
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...
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#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
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#include "jsb_os_info.hpp"
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#include "platform/android/CCJavascriptJavaBridge.h"
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#endif
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...
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#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
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sc->addRegisterCallback(register_jsb_os_info);
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sc->addRegisterCallback(JavascriptJavaBridge::_js_register);
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#endif
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sc->start();
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...
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```
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注意顺序，其他非相关代码都省略了。
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## 2. java端工作
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------
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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：
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```
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package org.cocos2dx.javascript;
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import org.cocos2dx.lib.Cocos2dxActivity;
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import android.content.Context;
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import android.net.ConnectivityManager;
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import android.net.NetworkInfo;
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import android.net.wifi.WifiManager;
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import android.net.wifi.WifiInfo;
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import android.telephony.TelephonyManager;
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public class AppActivity extends Cocos2dxActivity {
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private static Context mContext;
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private static String formatIp(int ip) {
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return ( ip & 0xFF ) + "." +
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((ip >> 8 ) & 0xFF) + "." +
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((ip >> 16 ) & 0xFF) + "." +
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((ip >> 24 ) & 0xFF) ;
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}
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public static NetworkInfo getNetworkInfo(Context context){
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ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
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return cm.getActiveNetworkInfo();
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}
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public static boolean isConnected(Context context){
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NetworkInfo info = AppActivity.getNetworkInfo(context);
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return (info != null && info.isConnected());
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}
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public static String getWifi(Context context){
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NetworkInfo info = AppActivity.getNetworkInfo(context);
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if (info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_WIFI) {
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WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
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WifiInfo wifiInfo = wifiManager.getConnectionInfo();
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return "Wifi|" + WifiManager.calculateSignalLevel(wifiInfo.getRssi(), 10) + "|" + wifiInfo.getLinkSpeed();
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} else {
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return "";
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}
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}
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public static String getMobile(Context context){
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NetworkInfo info = AppActivity.getNetworkInfo(context);
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if (info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_MOBILE) {
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String mobileType = AppActivity.getMobileType(info.getSubtype());
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return "Mobile|" + mobileType;
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} else {
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return "";
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}
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}
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public static String getMobileType(int subType){
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switch(subType){
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case TelephonyManager.NETWORK_TYPE_1xRTT:
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return "1xRTT"; // ~ 50-100 kbps
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case TelephonyManager.NETWORK_TYPE_CDMA:
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return "CDMA"; // ~ 14-64 kbps
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case TelephonyManager.NETWORK_TYPE_EDGE:
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return "EDGE"; // ~ 50-100 kbps
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case TelephonyManager.NETWORK_TYPE_EVDO_0:
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return "EVDO_0"; // ~ 400-1000 kbps
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case TelephonyManager.NETWORK_TYPE_EVDO_A:
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return "EVDO_A"; // ~ 600-1400 kbps
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case TelephonyManager.NETWORK_TYPE_GPRS:
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return "GPRS"; // ~ 100 kbps
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case TelephonyManager.NETWORK_TYPE_HSDPA:
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return "HSDPA"; // ~ 2-14 Mbps
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case TelephonyManager.NETWORK_TYPE_HSPA:
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return "HSPA"; // ~ 700-1700 kbps
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case TelephonyManager.NETWORK_TYPE_HSUPA:
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return "HSUPA"; // ~ 1-23 Mbps
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case TelephonyManager.NETWORK_TYPE_UMTS:
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return "UMTS"; // ~ 400-7000 kbps
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/*
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* Above API level 7, make sure to set android:targetSdkVersion
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* to appropriate level to use these
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*/
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//case TelephonyManager.NETWORK_TYPE_EHRPD: // API level 11
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case 14:
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return "EHRPD"; // ~ 1-2 Mbps
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case TelephonyManager.NETWORK_TYPE_EVDO_B: // API level 9
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return "EVDO_B"; // ~ 5 Mbps
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//case TelephonyManager.NETWORK_TYPE_HSPAP: // API level 13
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case 15: // TelephonyManager.NETWORK_TYPE_HSPAP
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return "HSPAP"; // ~ 10-20 Mbps
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case TelephonyManager.NETWORK_TYPE_IDEN: // API level 8
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return "IDEN"; // ~25 kbps
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//case TelephonyManager.NETWORK_TYPE_LTE: // API level 11
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case 13: // TelephonyManager.NETWORK_TYPE_LTE
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return "LTE"; // ~ 10+ Mbps
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// Unknown
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case TelephonyManager.NETWORK_TYPE_UNKNOWN:
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default:
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return "UNKNOWN";
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}
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}
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public static String getProvidersName(Context context) {
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try {
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TelephonyManager telephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
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String operator = telephonyManager.getSimOperator();
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if (operator == null || operator.equals("")) {
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return "unknown";
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}
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if (operator.startsWith("46000") || operator.startsWith("46002")) {
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return "cm";
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} else if (operator.startsWith("46001")) {
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return "cu";
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} else if (operator.startsWith("46003")) {
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return "ct";
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} else {
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return "unknown";
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}
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} catch (Exception e) {
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return "error";
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}
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}
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public static String osInfoBoardStatic() {
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mContext = AppActivity.getContext();
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String info = android.os.Build.MODEL + "|Android|" + android.os.Build.VERSION.RELEASE + "|" + AppActivity.getProvidersName(mContext) + "|";
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String str = "";
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if (!AppActivity.isConnected(mContext)) {
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return info + "Disconnected";
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} else {
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str = AppActivity.getWifi(mContext);
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if (str != "") {
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return info + str;
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}
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str = AppActivity.getMobile(mContext);
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if (str != "") {
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return info + str;
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} else {
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return info + "Unknown";
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}
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}
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}
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}
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```
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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。
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## 3. 配置文件修改
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------
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修改项目目录frameworks/runtime-src/proj.android/jni/Android.mk文件，加上jsb_os_info.hpp：
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```
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...
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LOCAL_SRC_FILES := hellojavascript/main.cpp \
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../../Classes/jsb_os_info.hpp \
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../../Classes/AppDelegate.cpp
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...
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```
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然后重新编译就可以在jsb环境下，用javascript执行osInfo这个函数。
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## 4. javascript端执行效果
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------
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Wifi和手机上网状态，用javascript的osInfo函数返回分别是这样的：
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```
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vivo Xplay3S|Android|4.3|cm|Wifi|4|39
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vivo Xplay3S|Android|4.3|cm|Mobile|LTE
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```
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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。
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## 5. 反射机制调用
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------
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就在文档写到尾声的时候，在英文论坛突然发现这篇文档：
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https://github.com/joshuastray/cocos-docs/blob/master/manual/framework/html5/v3/reflection/zh.md
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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。
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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？
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## 6. 参考文档
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------
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【集成友盟社会化SDK】COCOS2D-JS3.0ALPHA2中JAVA/C++/JAVASCRPIT 三方交互的实现
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http://www.asmld.com/?p=113
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3.jni_c++调用java中的方法
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http://banshaotang.iteye.com/blog/2078501
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cocos2d-x 使用JniHelper 调用 java代码 获取安卓生成的唯一标示UUID
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http://blog.csdn.net/yxiaom/article/details/17137479
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