开始编写Cocosd-x对Java进行调用的测试代码

目前计划是这样的， 首先， 在Java代码中写两个测试的函数，JniTestFunction_Static, JniTestFunction.

话说，在VIM还不熟练的时候使用VIM真的是降低效率思密达。VIM和Emacs还是得会一个，考虑到Stalllman的固执己见，我还是觉得VIM更体贴一些。

JniHelper.h中定义了一个结构体JniMethodInfo和一个类JniHelper. 代码如下：

/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org

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.
****************************************************************************/
#ifndef __ANDROID_JNI_HELPER_H__
#define __ANDROID_JNI_HELPER_H__

#include <jni.h>
#include <string>
#include "platform/CCPlatformMacros.h"

NS_CC_BEGIN

typedef struct JniMethodInfo_
{
	
//	The env pointer is a structure that contains the interface to the 
//	JVM. It includes all of the functions necessary to interact with 
//	the JVM and to work with Java objects. Example JNI functions are 
//	converting native arrays to/from Java arrays, converting native 
//	strings to/from Java strings, instantiating objects, throwing 
//	exceptions, etc. Basically, anything that Java code can do can be 
//	done using JNIEnv, albeit with considerably less ease.
	
//	env指针是一个包含了JVM接口的指针。他包含了全部必要的用来和JVM进行通讯的函数。比如
//	将本地数组转换成Java数组，将本地字符串转换成Java字符串，实例化对象，抛出异常等等。
//	基本上，任何可以用Java代码实现的功能都可以通过JNIEnv实现，尽管实现的不是那么轻松。
	
//  A JNI interface pointer (JNIEnv*) is passed as an argument for each 
//  native function mapped to a Java method, allowing for interaction 
//  with the JNI environment within the native method. This JNI 
//  interface pointer can be stored, but remains valid only in the 
//  current thread. Other threads must first call AttachCurrentThread() 
//  to attach themselves to the VM and obtain a JNI interface pointer. 
//  Once attached, a native thread works like a regular Java thread 
//  running within a native method. The native thread remains attached 
//  to the VM until it calls DetachCurrentThread() to detach itself.[4]

//	JNI interface pointer (JNIEnv*) 在每一个对应于Java函数的Native函数中都作为
//	一个参数传入，这样做可以让JNI环境和Native函数进行沟通。这个JNI接口会被储存，但是
//	只有在当前线程中有效。其他的线程必须首先调用AttachCurrentThread()来将他们自己
//	附到VM上并且获取一个JNIEnv.一旦附属到VM上，一个Native线程就会像一个Java线程那样
//	运行。本地线程会保持附属直到调用DetachCurrentThread().

//  参见 jni.h
    JNIEnv *    env;
    jclass      classID;
    jmethodID   methodID;
} JniMethodInfo;

class CC_DLL JniHelper
{
public:
    static JavaVM* getJavaVM();
    static void setJavaVM(JavaVM *javaVM);
    static jclass getClassID(const char *className, JNIEnv *env=0);
    static bool getStaticMethodInfo(JniMethodInfo &methodinfo, const char *className, const char *methodName, const char *paramCode);
    static bool getMethodInfo(JniMethodInfo &methodinfo, const char *className, const char *methodName, const char *paramCode);
    static std::string jstring2string(jstring str);

private:
    static JavaVM *m_psJavaVM;
};

NS_CC_END

#endif // __ANDROID_JNI_HELPER_H__

现在我定义一个JniMethodInfo. 然后用getStaticMethodInfo来尝试获得Java里面的jniTestFunction_Static的函数信息

写道HelloWorldScene.cpp中

#include "HelloWorldScene.h"
#include "SimpleAudioEngine.h"

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
#include <jni.h>
#include "platform/android/jni/JniHelper.h"
#include <android/log.h>
#endif

using namespace cocos2d;
using namespace CocosDenshion;

CCScene* HelloWorld::scene()
{
    // 'scene' is an autorelease object
    CCScene *scene = CCScene::create();
    
    // 'layer' is an autorelease object
    HelloWorld *layer = HelloWorld::create();

    // add layer as a child to scene
    scene->addChild(layer);

    // return the scene
    return scene;
}

// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !CCLayer::init() )
    {
        return false;
    }

    /////////////////////////////
    // 2. add a menu item with "X" image, which is clicked to quit the program
    //    you may modify it.

    // add a "close" icon to exit the progress. it's an autorelease object
    CCMenuItemImage *pCloseItem = CCMenuItemImage::create(
                                        "CloseNormal.png",
                                        "CloseSelected.png",
                                        this,
                                        menu_selector(HelloWorld::menuCloseCallback) );
    pCloseItem->setPosition( ccp(CCDirector::sharedDirector()->getWinSize().width - 20, 20) );

    // create menu, it's an autorelease object
    CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);
    pMenu->setPosition( CCPointZero );
    this->addChild(pMenu, 1);

    /////////////////////////////
    // 3. add your codes below...

    // add a label shows "Hello World"
    // create and initialize a label
    CCLabelTTF* pLabel = CCLabelTTF::create("Hello World", "Thonburi", 34);

    // ask director the window size
    CCSize size = CCDirector::sharedDirector()->getWinSize();

    // position the label on the center of the screen
    pLabel->setPosition( ccp(size.width / 2, size.height - 20) );

    // add the label as a child to this layer
    this->addChild(pLabel, 1);

    // add "HelloWorld" splash screen"
    CCSprite* pSprite = CCSprite::create("HelloWorld.png");

    // position the sprite on the center of the screen
    pSprite->setPosition( ccp(size.width/2, size.height/2) );

    // add the sprite as a child to this layer
    this->addChild(pSprite, 0);
    
    // JNI call test
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) //判断当前是否为Android平台
    JniMethodInfo minfo;//定义Jni函数信息结构体
    //getStaticMethodInfo 次函数返回一个bool值表示是否找到此函数
    bool isHave = JniHelper::getStaticMethodInfo(minfo,"com/chen/FuckAndroid","JniTestFunction_Static", "()V");
 
    if (!isHave) {
        CCLog("jni:此函数不存在");
    }else{
        CCLog("jni:此函数存在");
        //调用此函数
        minfo.env->CallStaticVoidMethod(minfo.classID, minfo.methodID);
    }
    CCLog("jni-java函数执行完毕");
#endif
    
    
    return true;
}

void HelloWorld::menuCloseCallback(CCObject* pSender)
{
    CCDirector::sharedDirector()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    exit(0);
#endif
}

调用的方法在com.chen.FuckAndroid.java中

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org

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 com.chen;

import org.cocos2dx.lib.Cocos2dxActivity;
import org.cocos2dx.lib.Cocos2dxEditText;
import org.cocos2dx.lib.Cocos2dxGLSurfaceView;
import org.cocos2dx.lib.Cocos2dxRenderer;

import android.app.ActivityManager;
import android.content.Context;
import android.content.pm.ConfigurationInfo;
import android.os.Bundle;
import android.util.Log;
import android.widget.FrameLayout;
import android.view.ViewGroup;

public class FuckAndroid extends Cocos2dxActivity{

	protected void onCreate(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);
		
		if (detectOpenGLES20()) {
			// get the packageName,it's used to set the resource path
			String packageName = getApplication().getPackageName();
			super.setPackageName(packageName);
			
            // FrameLayout
            ViewGroup.LayoutParams framelayout_params =
                new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
                                           ViewGroup.LayoutParams.FILL_PARENT);
            FrameLayout framelayout = new FrameLayout(this);
            framelayout.setLayoutParams(framelayout_params);

            // Cocos2dxEditText layout
            ViewGroup.LayoutParams edittext_layout_params =
                new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
                                           ViewGroup.LayoutParams.WRAP_CONTENT);
            Cocos2dxEditText edittext = new Cocos2dxEditText(this);
            edittext.setLayoutParams(edittext_layout_params);

            // ...add to FrameLayout
            framelayout.addView(edittext);

            // Cocos2dxGLSurfaceView
	        mGLView = new Cocos2dxGLSurfaceView(this);

            // ...add to FrameLayout
            framelayout.addView(mGLView);

	        mGLView.setEGLContextClientVersion(2);
	        mGLView.setCocos2dxRenderer(new Cocos2dxRenderer());
            mGLView.setTextField(edittext);

            // Set framelayout as the content view
			setContentView(framelayout);
		}
		else {
			Log.d("activity", "don't support gles2.0");
			finish();
		}	
	}
	
	 @Override
	 protected void onPause() {
	     super.onPause();
	     mGLView.onPause();
	 }

	 @Override
	 protected void onResume() {
	     super.onResume();
	     mGLView.onResume();
	 }
	 
	 private boolean detectOpenGLES20() 
	 {
	     ActivityManager am =
	            (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
	     ConfigurationInfo info = am.getDeviceConfigurationInfo();
	     return (info.reqGlEsVersion >= 0x20000);
	 }
	 
	 //////////////////////////
	 // These functions will be called by C++ code
	 public static void JniTestFunction_Static(){
		 System.out.println("JniTestFunction_Static_Called");
	 }
	 public void JniTestFunction(){
		 System.out.println("JniTestFunction_Called");
	 }
	 /////////////////////////
	 
     static {
         System.loadLibrary("game");
     }
}

调用结果：