Problem with JNI context always null

cocos2d-x C++
1

I create share function in java use sharingIntent.
About JNI call from c++ is fine It can call java side.
But when I debug, It always return null context.
This is my code.

File: “shareGame.java” in “src” folder

package com.dejo.rollingplanet;

import android.app.Application;
import android.content.Context;
import android.content.Intent;
import android.util.Log;


public class shareGame extends Application {
	public static Context mContext;
   	
	@Override
    public void onCreate() {
        super.onCreate();
        mContext = getApplicationContext();
    }
	    	
	public static void shareText() {
		Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND); 
		sharingIntent.setType("text/plain");
		String shareBody = "Come and help this little guy!!";
		sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Rolling Planet");
		sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareBody);
		if (mContext == null) return;
		mContext.startActivity(Intent.createChooser(sharingIntent, "Share via"));
	}

}

File “MenuScene.h”

/*
 * Include JNI
 */
#include <jni.h>
#include <platform/android/jni/JniHelper.h>

/*
 * myStatic function for JNI
 */
static void shareIt();

File “MenuScene.cpp”

 /*
  * myStatic function for JNI
  */
void MenuScene::shareIt() {
	cocos2d::JniMethodInfo methodInfo;

	if (! cocos2d::JniHelper::getStaticMethodInfo(methodInfo, "com/dejo/rollingplanet/shareGame", "shareText", "()V")) {
		return;
	}

	methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID);
	methodInfo.env->DeleteLocalRef(methodInfo.classID);

}

Please Help