Cocos2d-x调用Java 代码

Java代码：

package com.dishu;

import com.dishu.org.R;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Looper;

public class Dialog {
    public static Dialog ins = null;
    public static Dialog getInstance(){
        if (ins == null){
            ins = new Dialog();
        }
        return ins;
    }  

    private Activity _activity;
    public void initRoot(Activity root)
    {
        _activity = root;
    }
    public void showQuitDialog()
    {
        _activity.runOnUiThread(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                AlertDialog.Builder builder = new AlertDialog.Builder(_activity);
                builder.setMessage(R.string.msg);
                builder.setPositiveButton(R.string.sure, new DialogInterface.OnClickListener(){
                    public void onClick(DialogInterface dialoginterface, int i){
                        //按钮事件
                        _activity.finish();
                        System.exit(0);
                     }
                });
                builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialoginterface, int i){
                        //按钮事件
                     }
                });
                builder.create().show();
            }
        });
    }
}

public class AppActivity extends Cocos2dxActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Dialog.getInstance().initRoot(this);
    }
}

cocos2dx代码：

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

        // JNI call test
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
        JniMethodInfo minfo;
        jobject jobj;
        if (JniHelper::getStaticMethodInfo(minfo, "com/dishu/Dialog",
            "getInstance", "()Lcom/dishu/Dialog;"))
        {
            jobj = minfo.env->CallStaticObjectMethod(minfo.classID, minfo.methodID);
            if (JniHelper::getMethodInfo(minfo, "com/dishu/Dialog",
                "showQuitDialog", "()V"))
            {
                minfo.env->CallVoidMethod(jobj, minfo.methodID);
            }
        }

#endif