Cocos2d-x学习记录 -- Java调用C++方法

    UmengGame的代码如下， 该代码演示了集成友盟Social SDK的。

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package com.umeng.game;

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

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.widget.Toast;

import com.umeng.socialize.bean.SHARE_MEDIA;
import com.umeng.socialize.bean.SocializeEntity;
import com.umeng.socialize.controller.RequestType;
import com.umeng.socialize.controller.UMServiceFactory;
import com.umeng.socialize.controller.UMSocialService;
import com.umeng.socialize.controller.listener.SocializeListeners.SnsPostListener;

public class UmengGame extends Cocos2dxActivity {

	/**
	 * Handler, 用于包装友盟的openShare方法，保证openShare方法在UI线程执行
	 */
	private static Handler mHandler = null;
	/**
	 * 保存当前Activity实例， 静态变量
	 */
	private static Activity mActivity = null;
	/**
	 * 友盟Social SDK实例，整个SDK的Controller
	 */
	private static UMSocialService mController = UMServiceFactory
			.getUMSocialService("com.umeng.cocos2dx", RequestType.SOCIAL);
	/**
	 * 
	 */
	private static final int DELAY = 100;

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.cocos2dx.lib.Cocos2dxActivity#onCreate(android.os.Bundle)
	 */
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		mActivity = this;
		mHandler = new Handler(Looper.getMainLooper());
		
		mController.setShareContent("COCOS2D-X HACKATHON.");

	}

	/**
	 * 打开分享面板
	 */
	public static void openShare() {
		mHandler.postDelayed(new Runnable() {

			@Override
			public void run() {
				mController.registerListener(mPostListener);
				// 打开友盟的分享平台选择面板
				mController.openShare(mActivity, false);
			}
		}, DELAY);
	}

	/**
	 * 
	 */
	public static SnsPostListener mPostListener = new SnsPostListener() {

		@Override
		public void onStart() {
			onNativeStart();
		}

		@Override
		public void onComplete(SHARE_MEDIA platform, int eCode,
				SocializeEntity entity) {
			Toast.makeText(mActivity, platform + ", " + eCode,
					Toast.LENGTH_SHORT).show();
			onNativeComplete(platform.toString(), eCode, entity.mDescriptor);
		}

	};

	public native static void onNativeStart();

	public native static void onNativeComplete(String platform, int eCode,
			String descriptor);

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.cocos2dx.lib.Cocos2dxActivity#onCreateView()
	 */
	public Cocos2dxGLSurfaceView onCreateView() {
		Cocos2dxGLSurfaceView glSurfaceView = new Cocos2dxGLSurfaceView(this);
		// UmengGame should create stencil buffer
		glSurfaceView.setEGLConfigChooser(5, 6, 5, 0, 16, 8);

		return glSurfaceView;
	}

	/**
	 * load lib
	 */
	static {
		System.loadLibrary("cocos2dcpp");
	}
}

     代码中，包含两个native方法， 因此需要使用javah 命令生成.h文件。 首先通过eclipse编译该项目( javac不能编译引用了android SDK的类)， 生成.class文件。然后在命令行下进入到项目的src目录下， 本项目的src目录为 :  ~/dev/cocos2d-x-2.2.1/projects/UmengGame/proj.android/src ，然后使用javah  com.umeng.game.UmengGame 命令生成.h文件， 注意要写类的完整路径， 而且没有后缀名。成功后会在src目录下生成.h文件， 重建一个.cpp文件， 实现两个方法即可。