說白了，就是JavaScript和Java之間的函數互相調用。

先看一下效果

有了這個交互，為了以後接sdk做準備。

要點：

javascript調用java：

jsb.reflection.callStaticMethod("org/cocos2dx/javascript/AppActivity", "hello", "(Ljava/lang/String;)V", "this is a message from js");

java調用javaScript：

Cocos2dxJavascriptJavaBridge.evalString("Global.mlayer.exit_cancle();"); // java to js

在這裏我把這cocos2d-js的app.js 和 Android工程的AppActivity.java 的代碼貼上，代碼也有註釋，純幹貨，拿走就能用！

app.js:

var HelloWorldLayer = cc.Layer.extend({
    
	txt_info:null, 
	
	
	sprite:null,
	ctor:function () 
	{
        //////////////////////////////
        // 1. super init first
        this._super();

        /////////////////////////////
        // 2. add a menu item with "X" image, which is clicked to quit the program
        //    you may modify it.
        // ask the window size
        var size = cc.winSize;

        var mainscene = ccs.load(res.MainScene_json);
        this.addChild(mainscene.node);

        /* you can create scene with following comment code instead of using csb file.
        /////////////////////////////
        // 3. add your codes below...
        // add a label shows "Hello World"
        // create and initialize a label
        var helloLabel = new cc.LabelTTF("Hello World", "Arial", 38);
        // position the label on the center of the screen
        helloLabel.x = size.width / 2;
        helloLabel.y = size.height / 2 + 200;
        // add the label as a child to this layer
        this.addChild(helloLabel, 5);

        // add "HelloWorld" splash screen"
        this.sprite = new cc.Sprite(res.HelloWorld_png);
        this.sprite.attr({
            x: size.width / 2,
            y: size.height / 2
        });
        this.addChild(this.sprite, 0);
        */
		
		
		//“測試傳參”按鈕
		var btn_hello = ccui.helper.seekWidgetByName(mainscene.node, "Button_1");
		btn_hello.addTouchEventListener(this.btn_hello_clicked,this);
		
		//"測試返回值" 按鈕
		var btn_testReturn = ccui.helper.seekWidgetByName(mainscene.node, "Button_2");
		btn_testReturn.addTouchEventListener(this.btn_testReturn_clicked,this);
		
		//“測試對話框” 按鈕
		var btn_dialog = ccui.helper.seekWidgetByName(mainscene.node, "Button_3");
		btn_dialog.addTouchEventListener(this.btn_dialog_clicked,this);
		
		//文本提示
		this.txt_info = ccui.helper.seekWidgetByName(mainscene.node, "Text_1");
		this.txt_info.setString("default");
		
        return true;
    },
	
	//打開java層的對話框
	btn_dialog_clicked:function(sender,type)
	{
		if(type == ccui.Widget.TOUCH_ENDED)
		{			
			//彈出提示框 ok
			jsb.reflection.callStaticMethod("org/cocos2dx/javascript/AppActivity", "showAlertDialog", "(Ljava/lang/String;Ljava/lang/String;)V", "提示","您確認要退出遊戲？");
			
		}
	},
	
	//測試 java函數的返回值
	btn_testReturn_clicked:function(sender,type)
	{
		if(type == ccui.Widget.TOUCH_ENDED)
		{
			//測試返回值 ok
			var result = jsb.reflection.callStaticMethod("org/cocos2dx/javascript/AppActivity", "sum", "(II)I", 3, 7);
			cc.log("result"+result);		
			this.txt_info.setString("sum="+result);						
		}
	},
	
	
	btn_hello_clicked:function(sender,type){
        //根據觸發事件的類型進行分情況處理
        switch (type) 
		{
        case ccui.Widget.TOUCH_BEGAN:
            //cc.log("btn_hello Touch Began");
            
            break;
        case ccui.Widget.TOUCH_MOVED:
            //cc.log("btn_hello Touch Moved");
            break;
        case ccui.Widget.TOUCH_ENDED:
            //cc.log("btn_hello Touch Ended");
			cc.log("TODO call java");
			jsb.reflection.callStaticMethod("org/cocos2dx/javascript/AppActivity", "hello", "(Ljava/lang/String;)V", "this is a message from js");			
            break;
        case ccui.Widget.TOUCH_CANCELED:
            //cc.log("btn_hello Touch Canceled");
            break;
        default:
            break;
        }
	},
	
	exit_sure:function()
	{
		this.txt_info.setString("確定");
	},
	
	exit_cancle:function()
	{
		this.txt_info.setString("取消");
	},
	
});



	
var HelloWorldScene = cc.Scene.extend({
    onEnter:function () {
        this._super();
        var layer = new HelloWorldLayer();
		Global.mlayer = layer;//保存到全局變量
        this.addChild(layer);
    }
});

AppActivity.java:

/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011      Zynga Inc.
Copyright (c) 2013-2014 Chukong Technologies Inc.
 
http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
***************************************************************************
 
*/
package org.cocos2dx.javascript;

import org.cocos2dx.lib.Cocos2dxActivity;
import org.cocos2dx.lib.Cocos2dxGLSurfaceView;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.pm.ActivityInfo;
import android.net.wifi.WifiInfo;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.WindowManager;
import android.widget.Toast;


import org.cocos2dx.lib.Cocos2dxJavascriptJavaBridge;


// The name of .so is specified in AndroidMenifest.xml. NativityActivity will load it automatically for you.
// You can use "System.loadLibrary()" to load other .so files.

public class AppActivity extends Cocos2dxActivity{
    
    /*
     * by joe
     */
    private static AppActivity app = null;
    //private static Context mContent = null;
    
    static String hostIPAdress = "0.0.0.0";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        
        if(nativeIsLandScape()) {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
        } else {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT);
        }
        if(nativeIsDebug()){
            getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        }
        hostIPAdress = getHostIpAddress();
        
        /**
         * by joe
         */
        app  =  this;
        //mContent = this;
    }
    
    @Override
    public Cocos2dxGLSurfaceView onCreateView() {
        Cocos2dxGLSurfaceView glSurfaceView = new Cocos2dxGLSurfaceView(this);
        // TestCpp should create stencil buffer
        glSurfaceView.setEGLConfigChooser(5, 6, 5, 0, 16, 8);

        return glSurfaceView;
    }

    public String getHostIpAddress() {
        WifiManager wifiMgr = (WifiManager) getSystemService(WIFI_SERVICE);
        WifiInfo wifiInfo = wifiMgr.getConnectionInfo();
        int ip = wifiInfo.getIpAddress();
        return ((ip & 0xFF) + "." + ((ip >>>= 8) & 0xFF) + "." + ((ip >>>= 8) & 0xFF) + "." + ((ip >>>= 8) & 0xFF));
    }
    
    public static String getLocalIpAddress() {
        return hostIPAdress;
    }
    
    private static native boolean nativeIsLandScape();
    private static native boolean nativeIsDebug();
    
    
    //---------------以下是cocos2dx-js 與  java 交互--------------------------
    
    /*
     * 目前Cocos2d-js中支持的Java類型簽名有下面4種
    Java類型     簽名
    int         I
    float       F
    boolean     Z
    String      Ljava/lang/String;
    */
    
    
    
    /**
     * 
     * jsb.reflection.callStaticMethod("org/cocos2dx/javascript/AppActivity", "hello", "(Ljava/lang/String;)V", "this is a message from js");
     * js->java
     * 測試無返回值的
     * @param msg
     */
    public static void hello(final String msg){  
        System.out.println(msg);  
        
        app.runOnUiThread(new Runnable() {
            
            @Override
            public void run() {
            
                Toast.makeText(app, msg, Toast.LENGTH_SHORT).show();
            }
        });

    }  
    
    /**
     * 
     * var result = jsb.reflection.callStaticMethod("org/cocos2dx/javascript/AppActivity", "sum", "(II)I", 3, 7);
     * js->java
     * 測試有返回值的
     * @param a
     * @param b
     * @return
     */
    public static int sum(int a, int b){
        return a + b;
    }
    
    
    /**
     * 彈出一個對話框
     * @param title
     * @param message
     */
    public static  void showAlertDialog(final String title,final String message) {

        //這裏一定要使用runOnUiThread
        app.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                // 創建構建器
                AlertDialog.Builder builder = new AlertDialog.Builder(app);
                builder.setTitle(title)//提示
                .setMessage(message)//您確認要退出遊戲？
                .setIcon(null)//.setIcon(R.drawable.icon)
                .setPositiveButton("確定", new DialogInterface.OnClickListener(){

                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        //System.out.println("是 clicked");
                        Toast.makeText(app, "確定", Toast.LENGTH_SHORT).show();
                        
                        //跳出一個提示。
                        //Toast.makeText(mContent, "確定", Toast.LENGTH_SHORT).show();
                        
                        //call cocos 函數 exit_sure
                        app.runOnGLThread(new Runnable() {  
                            @Override  
                            public void run() {  
                                Cocos2dxJavascriptJavaBridge.evalString("Global.mlayer.exit_sure();"); // java to js  
                            }  
                        });
                        
                    }})
                .setNegativeButton("取消", new DialogInterface.OnClickListener(){

                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                        //System.out.println("否 clicked");
                        Toast.makeText(app, "取消", Toast.LENGTH_SHORT).show();
                        
                        //call cocos 函數 exit_cancle
                        app.runOnGLThread(new Runnable() {  
                            @Override  
                            public void run() {  
                                Cocos2dxJavascriptJavaBridge.evalString("Global.mlayer.exit_cancle();"); // java to js  
                            }  
                        });
                        
                    }});
                builder.create().show();  
            }
        });
    }
         
    /**
     * java->js
     * @param a
     * @param b
     */
    public static void callcocos(int a){  

         app.runOnGLThread(new Runnable() {  
            @Override  
            public void run() {  
                //test
               // Cocos2dxJavascriptJavaBridge.evalString("SDKManage.javaToJSCall(\"a\", 5 , 7);"); // java to js  
            }  
        });
             
    }  
    
}

Cocos2d-js和Android交互