首先說明下，生成二維碼是用android原生的BitMatrix和Bitmap類來生成的，而掃描二維碼用到了google官方的zxing包(core.jar)。

這裡我把所有生成二維碼的程式碼和lua呼叫的掃描二維碼方法都放在了專案->frameworks->runtime-src->proj.android->src->org->cocos2dx->lua->AppActivity.java中。

而core_3.2.0.jar放在了proj.android->libs下，掃描二維碼相關類放到了專案->frameworks->runtime-src->proj.android

->src->zxing下。

-----1.下載zxing包core_3.2.0.jar

------------1.1下載地址：

------------1.2下載後放在libs中：

proj.android->libs->core_3.2.0.jar

-----2.下載掃描二維碼相關類及程式碼

------------2.1下載地址：

------------2.2將相關類引入工程：

將Android Zxing Demo->BarCodeTest->src->com->zxing複製貼上到專案->frameworks->runtime-src->

proj.android->src下。

------------2.3其中zxing包含的目錄結構為：

zxing

->activity    ->CaptureActivity.java

->camera   ->AutoFocusCallback.java

                  ->CameraConfigurationManager.java

                  ->CameraManager.java

                  ->FlashLightManager.java

                  ->PlanarYUVLuminanceSource.java

                  ->PreviewCallback.java

->decoding->CaptureActivityHandler.java

                  ->DecodeFormatManager.java

                  ->DecodeHandler.java

                  ->DecodeThread.java

                  ->FinishListener.java

                  ->InactivityTimer.java

                  ->Intents.java

->enCoding->EncodingHandler.java

->view        ->ViewfinderResultPointCallback.java

                  ->ViewfinderView.java

-----3.匯入資源

------------3.1 values：

將Android Zxing Demo->BarCodeTest->res->values中的ids.xml和colors.xml複製貼上到專案->frameworks->runtime-src->proj.android->res->values下,若已有這兩個檔案，合併下里面的程式碼。

------------3.2 raw：

將Android Zxing Demo->BarCodeTest->res->raw中的beep.ogg和relm_properties複製貼上到專案->frameworks->runtime-src->proj.android->res->raw下,若已有這兩個檔案，重新命名。

------------3.3 layout：

將Android Zxing Demo->BarCodeTest->res->layout中的camera.xml複製貼上到專案->frameworks->runtime-src->proj.android->res->layout下,若已有該檔案，重新命名。

------------3.4 圖片：

這裡只有一個drawable-mdpi下的navbar.9.png需要匯入，由於我後來更改了camera.xml檔案，所以我就匯入了我們的掃描介面資源，沒匯入Android Zxing Demo中的圖片資源。後面我會把我改的camera.xml檔案程式碼貼出來，其中有3張圖片，資源我就不放出來了，沒有的去網上隨便找個，名字一致就行。當然也放在drawable-mdpi下。

-----4.AndroidManifest.xml修改

------------4.1 增加許可權：

 	<!-- 二維碼 -->
 	<uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />

------------4.2 增加掃描介面Activity：

<Application />下新增Activity元素

        <activity
            android:name="zxing.activity.CaptureActivity"
            android:screenOrientation="landscape"
            android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
            android:hardwareAccelerated="true" >
        </activity>

其中有句android:hardwareAccelerated="true"，因為掃描介面是有個不斷掃動的條的，這裡我是用android的平移動畫來實現的，實現後出現了圖片閃爍顯示不全的問題，於是在該<activity />頁簽下加上了這句，意思是在該activity上開啟硬體加速。

-----5.生成二維碼

------------5.1專案->frameworks->runtime-src->proj.android->src->org->cocos2dx->lua->AppActivity.java新增程式碼：

其中報紅叉的類自己引入一下。

	private static final int BLACK = 0xff000000;
	private static final int WHITE = 0xffffffff;

	//生成二維碼
	public static boolean createQRCode(String str, int widthAndHeight, String filePath) throws WriterException {//Bitmap String str,int widthAndHeight
		Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();  
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 
		BitMatrix matrix = new MultiFormatWriter().encode(str,
				BarcodeFormat.QR_CODE, widthAndHeight, widthAndHeight);
		int width = matrix.getWidth();
		int height = matrix.getHeight();
		int[] pixels = new int[width * height];
		
		for (int y = 0; y < height; y++) {
			for (int x = 0; x < width; x++) {
				if (matrix.get(x, y)) {
					pixels[y * width + x] = BLACK;
				}else{
					pixels[y * width + x] = WHITE;
				}
			}
		}
		Bitmap bitmap = Bitmap.createBitmap(width, height,
				Bitmap.Config.ARGB_8888);
		bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
		saveBitmap(bitmap, filePath);
		return true;
	}

	//儲存圖片
	public static void saveBitmap(Bitmap bitmap, String filePath){
		File file = new File(filePath, "qrCode.png");
		if (file.exists()) {
			file.delete();
		}
		try {
			FileOutputStream out = new FileOutputStream(file);
			bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
			out.flush();
			out.close();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

其中createQRcode方法為最終lua掉用oc的方法，將生成的圖片存到cocos2dx的writablePath下,並儲存為"qrCode.png"。最後在lua端取出用sprite顯示。
------------5.2lua呼叫createQRcode方法，並顯示

    local luaj = require "src.cocos.cocos2d.luaj"
    local className = "org/cocos2dx/lua/AppActivity"
    local methodName = "createQRCode"
    local filePath = cc.FileUtils:getInstance():getWritablePath()
    local args = 
    {
        "https://www.baidu.com/",
        180,
        filePath
    }
    local sig = "(Ljava/lang/String;ILjava/lang/String;)Z"

    local ok, ret = luaj.callStaticMethod(className, methodName, args, sig)
    if ok and ret then
        print("ok and ret")
        filePath = filePath.."qrCode.png"
        local rect = cc.rect(0, 0, 180, 180)
        local sprite = cc.Sprite:create() 
        sprite:initWithFile(filePath, rect)
        sprite:setPosition(300, 300)
        self:addChild(sprite)
    end

luaj.callStaticMethod為lua呼叫java程式碼的方法。args為將要呼叫java方法的引數，sig為將要呼叫的java方法的引數型別和返回型別，括號裡為引數型別，括號外為返回型別。

-----6.掃描二維碼

------------6.1專案->frameworks->runtime-src->proj.android->src->org->cocos2dx->lua->AppActivity.java新增程式碼：

其中報紅叉的類自己引入一下。

	public static AppActivity activity;
	private static int luaFuncId;
	private final static int SCANNIN_GREQUEST_CODE = 1;

	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		activity = this;
	}

	//掃描二維碼
	public static void scanQRCode(final int luaFunctionId){
		luaFuncId = luaFunctionId;
		Intent intent = new Intent();
		intent.setClass(activity, CaptureActivity.class);
		intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
		activity.startActivityForResult(intent, SCANNIN_GREQUEST_CODE);
	}

	//二維碼掃描成功返回時處理
	@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
		case SCANNIN_GREQUEST_CODE:
			if(resultCode == RESULT_OK){
				Bundle bundle = data.getExtras();
				String result = bundle.getString("result");
				Cocos2dxLuaJavaBridge.callLuaFunctionWithString(luaFuncId, result);
				Cocos2dxLuaJavaBridge.releaseLuaFunction(luaFuncId);
			}
			break;
		}
    }

其中publicstatic AppActivityactivity;其中為呼叫掃描介面時需要的引數，其值在onCreate中賦值。

其中privatestaticintluaFuncId;為掃描成功後，java呼叫的lua方法。這裡在lua呼叫java的scanQRCode方法時作為引數傳進來，並賦值。

------------6.2lua掉用java掃描二維碼程式碼：

    local luaj = require "src.cocos.cocos2d.luaj"
    local callBack = function (result)
        print("cocos result : ", result)
    end

    local className = "org/cocos2dx/lua/AppActivity"
    local methodName = "scanQRCode"
    local args = 
    {
        callBack
    }
    local sig = "(I)V"
    luaj.callStaticMethod(className, methodName, args, sig)

-----7.掃描二維碼程式碼修改

說明：由於我們的掃描介面是橫屏的，並且修改了掃描時的介面，同時加上掃描時的動畫，所以在demo的程式碼上做了些小改動。
------------7.1 橫屏掃描：

src->zing->camera->CameraConfigurationManager.java類的void setDesiredCameraParameters(Camera camera)方法中，

將camera.setDisplayOrientation(90);註釋掉。

------------7.2 自己的掃描介面：

---------------------7.2.1ViewFinderView.java修改：
src->zing->view->ViewFinderView.java類的publicvoid onDraw(Canvas canvas)方法的裡面全部註釋，不用demo中的介面。

---------------------7.2.2camera.xml修改：
全部程式碼為：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <SurfaceView
        android:id="@+id/preview_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />

	<zxing.view.ViewfinderView
        android:id="@+id/viewfinder_view"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />
        
	<ImageView
		android:id="@+id/scan_bg"
	    android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center"
		android:src="@drawable/bg_saoyisao" />
        
	<ImageView
		android:id="@+id/scan_line"
		android:layout_width="280dp"
		android:layout_height="2dp"
		android:layout_alignParentTop="true"
		android:layout_gravity="center_horizontal"
		android:layout_marginTop="70dp"
		android:src="@drawable/bg_saoyisao_tiao" />

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center"
        android:orientation="vertical" >

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:paddingBottom="10dp"
            android:paddingTop="10dp"
            android:text="@string/saoyisao"
            android:textColor="@android:color/white"
            android:textSize="25sp"	/>

        <Button
            android:id="@+id/btn_cancel_scan"
            android:layout_width="19dp"
            android:layout_height="33dp"
            android:gravity="top|left"
            android:layout_marginTop="10dp"
            android:layout_marginLeft="10dp"
            android:background="@drawable/btn_fanhui1" />
        
    </RelativeLayout>

</FrameLayout>

其中scan_bg為掃描框及其餘部分半透的一個大背景，scan_line為不斷掃描的條，btn_cancel_scan為返回按鈕。沒有圖片資源的可以在網上隨便找個，然後把名字改為上面對應的名字，放在res->drawable-mdpi下。
------------7.3 掃描線動畫：
src->zxing->activity->CaptureActivity.java類中publicvoid onCreate(Bundle savedInstanceState)方法最後新增程式碼：

		TranslateAnimation animation = new TranslateAnimation(0, 0, 0, 650); 
		animation.setDuration(2000);//設定動畫持續時間 
		animation.setRepeatCount(-1);//設定重複次數 Animation.INFINITE
//		animation.setRepeatMode(Animation.REVERSE);//設定反方向執行 
		scanLine.startAnimation(animation);

由於播放掃描條的動畫時，掃描條閃爍顯示不全，所以在AndroidManifest.xml中添加了開啟硬體加速的程式碼，參考4.2 。 -----8.備註： ------------8.1 完整AppAcitivity.java程式碼：

/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2010-2016 cocos2d-x.org
Copyright (c) 2013-2016 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.lua;

import org.cocos2dx.lib.Cocos2dxActivity;
import org.cocos2dx.lib.Cocos2dxLuaJavaBridge;

import zxing.activity.CaptureActivity;

/**
 * 以下均為掃描二維碼倒入的類 
 */
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Hashtable;

import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.WindowManager;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

public class AppActivity extends Cocos2dxActivity{  
	public static AppActivity activity;
	private static int luaFuncId;
	private final static int SCANNIN_GREQUEST_CODE = 1;
	private static final int BLACK = 0xff000000;
	private static final int WHITE = 0xffffffff;
	
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		activity = this;
	}
	
	//生成二維碼
	public static boolean createQRCode(String str, int widthAndHeight, String filePath) throws WriterException {//Bitmap String str,int widthAndHeight
		Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();  
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 
		BitMatrix matrix = new MultiFormatWriter().encode(str,
				BarcodeFormat.QR_CODE, widthAndHeight, widthAndHeight);
		int width = matrix.getWidth();
		int height = matrix.getHeight();
		int[] pixels = new int[width * height];
		
		for (int y = 0; y < height; y++) {
			for (int x = 0; x < width; x++) {
				if (matrix.get(x, y)) {
					pixels[y * width + x] = BLACK;
				}else{
					pixels[y * width + x] = WHITE;
				}
			}
		}
		Bitmap bitmap = Bitmap.createBitmap(width, height,
				Bitmap.Config.ARGB_8888);
		bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
		saveBitmap(bitmap, filePath);
		return true;
	}
	
	//掃描二維碼
	public static void scanQRCode(final int luaFunctionId){
		luaFuncId = luaFunctionId;
		Intent intent = new Intent();
		intent.setClass(activity, CaptureActivity.class);
		intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
		activity.startActivityForResult(intent, SCANNIN_GREQUEST_CODE);
	}
	
	//儲存圖片
	public static void saveBitmap(Bitmap bitmap, String filePath){
		File file = new File(filePath, "qrCode.png");
		if (file.exists()) {
			file.delete();
		}
		try {
			FileOutputStream out = new FileOutputStream(file);
			bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
			out.flush();
			out.close();
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//二維碼掃描成功返回時處理
	@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch (requestCode) {
		case SCANNIN_GREQUEST_CODE:
			if(resultCode == RESULT_OK){
				Bundle bundle = data.getExtras();
				String result = bundle.getString("result");
				Cocos2dxLuaJavaBridge.callLuaFunctionWithString(luaFuncId, result);
				Cocos2dxLuaJavaBridge.releaseLuaFunction(luaFuncId);
			}
			break;
		}
    }
}

------------8.2 若遇到R.xx.xx找不到或者報紅時，可能是layout中的佈局檔案xxx.xml有問題或者values中的xxx.xml有問題，請仔細檢查並更改。
------------8.3 enCoding->EncodingHandler.java這個類是生成二維碼的程式碼，我這裡將生成的程式碼放在了AppActivity.java中，所以就沒用到這個類。不需要的也可以將EncodingHandler.java刪除。