Cococ2D-X call native Android(JNI) and IOS method’s

Well we all like cross programming I guess and especially when it works 🙂
Here is a c++ class that can call JNI or IOS methods according to the running platform. With it you can execute any native (openUrl,market etc. ) function. Be sure to see the examples for Android and IOS.

NativeInterface


#ifndef NATIVEINTERFACE_H_
#define NATIVEINTERFACE_H_

#include "cocos2d.h"
using namespace cocos2d;

class NativeInterface {
public:

	CCString * nativeCallback(const char* str);

	NativeInterface();
	virtual ~NativeInterface();
};

#endif /* NATIVEINTERFACE_H_ */

#ifndef NATIVEINTERFACE_H_

#define NATIVEINTERFACE_H_

#include "cocos2d.h"

using namespace cocos2d;

class NativeInterface {

public:

CCString * nativeCallback(const char* str);

NativeInterface();

virtual ~NativeInterface();

};

#endif /* NATIVEINTERFACE_H_ */


#include "NativeInterface.h"
#if(CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
#include "platform/android/jni/JniHelper.h"
#include "platform/CCCommon.h"
#endif
#if(CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
#include "IOSHelper.h"
#endif
#include <string>

using namespace std;

CCString * NativeInterface::nativeCallback(const char* str){

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) // won't compile this part if IOS

	JniMethodInfo minfo;

	if(JniHelper::getStaticMethodInfo(minfo, "com/example/package/path/JniHelper",  "open", "(Ljava/lang/String;)Ljava/lang/String;"))
	{

		string tmp(str);
		tmp = tmp + " from Android";

		jstring message = minfo.env->NewStringUTF(tmp.c_str());
		jstring return_value = (jstring) minfo.env->CallStaticObjectMethod(minfo.classID, minfo.methodID, message);

		string ret = JniHelper::jstring2string(return_value);

		CCString *sret = CCString::create("ef");

		minfo.env->DeleteLocalRef(message);
		//minfo.env->DeleteLocalRef(return_value);
		minfo.env->DeleteLocalRef(minfo.classID);

		return sret;
	}

#elif (CC_TARGET_PLATFORM == CC_PLATFORM_IOS) // won't compile this part if ANDROID

		IOSHelper *hios = new IOSHelper();

                string tmp(str);
		string ret = hios->nativeCallback(tmp);

		CCString *sret = CCString::create(ret.c_str());

		return sret;

#endif

	CCString *pret = CCString::create("none");
	return pret;

}
NativeInterface::NativeInterface() {


}

NativeInterface::~NativeInterface() {
	
}

#include "NativeInterface.h"

#if(CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)

#include "platform/android/jni/JniHelper.h"

#include "platform/CCCommon.h"

#endif

#if(CC_TARGET_PLATFORM == CC_PLATFORM_IOS)

#include "IOSHelper.h"

#endif

#include <string>

using namespace std;

CCString * NativeInterface::nativeCallback(const char* str){

#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) // won't compile this part if IOS

JniMethodInfo minfo;

if(JniHelper::getStaticMethodInfo(minfo, "com/example/package/path/JniHelper", "open", "(Ljava/lang/String;)Ljava/lang/String;"))

{

string tmp(str);

tmp = tmp + " from Android";

jstring message = minfo.env->NewStringUTF(tmp.c_str());

jstring return_value = (jstring) minfo.env->CallStaticObjectMethod(minfo.classID, minfo.methodID, message);

string ret = JniHelper::jstring2string(return_value);

CCString *sret = CCString::create("ef");

minfo.env->DeleteLocalRef(message);

//minfo.env->DeleteLocalRef(return_value);

minfo.env->DeleteLocalRef(minfo.classID);

return sret;

}

#elif (CC_TARGET_PLATFORM == CC_PLATFORM_IOS) // won't compile this part if ANDROID

IOSHelper *hios = new IOSHelper();

string tmp(str);

string ret = hios->nativeCallback(tmp);

CCString *sret = CCString::create(ret.c_str());

return sret;

#endif

CCString *pret = CCString::create("none");

return pret;

}

NativeInterface::NativeInterface() {

}

NativeInterface::~NativeInterface() {

}

Android

Okay we have

One action that runs our Cocos2D-X application – MyGame.java
a helper class to call another Action(s) – JniHelper.java
the Action that will be called by the heper class – MyAction.java
If you get error like method id not found check your method signature and if it doesent work make your method static

Notice the method I’ll be calling has one parameter and a return value both string. If you want to use another method like void with no return value you should change the method signature in NativeInterface.cpp, 4th parameter of JniHelper::getStaticMethodInfo


//everybody has this class under src folder, it starts you cocos2d app/game

package com.donkeycat.RankMaster;

import org.cocos2dx.lib.Cocos2dxActivity;

import android.os.Bundle;

public class MyGame extends Cocos2dxActivity{

	protected JniHelper mHelper;

	protected void onCreate(Bundle savedInstanceState){
		
		super.onCreate(savedInstanceState);
		mHelper = new JniHelper(this);
	
	}

	static {
		System.loadLibrary("game");
	}
}

//everybody has this class under src folder, it starts you cocos2d app/game

package com.donkeycat.RankMaster;

import org.cocos2dx.lib.Cocos2dxActivity;

import android.os.Bundle;

public class MyGame extends Cocos2dxActivity{

protected JniHelper mHelper;

protected void onCreate(Bundle savedInstanceState){

super.onCreate(savedInstanceState);

mHelper = new JniHelper(this);

}

static {

System.loadLibrary("game");

}


package com.example.MyGame;

import android.app.Activity;
import android.content.Intent;
import android.util.Log;

public class JniHelper {

	static Activity activity;

	public JniHelper(Activity activity){
		JniHelper.activity = activity;
	}

	public static java.lang.String open(java.lang.String message)
	{

		Intent intent = new Intent(JniHelper.activity, MyActivity.class);
		
		JniHelper.activity.startActivity(intent);

		return "Yes No";

	}
}

package com.example.MyGame;

import android.app.Activity;

import android.content.Intent;

import android.util.Log;

public class JniHelper {

static Activity activity;

public JniHelper(Activity activity){

JniHelper.activity = activity;

}

public static java.lang.String open(java.lang.String message)

{

Intent intent = new Intent(JniHelper.activity, MyActivity.class);

JniHelper.activity.startActivity(intent);

return "Yes No";

}


package com.example.MyGame;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.util.Log;
import android.view.Menu;

public class MyActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		AlertDialog alertDialog = new AlertDialog.Builder(this).create();

		Log.v("cocos2dx", "alert create ist done");

		alertDialog.setIcon(R.drawable.icon);
		alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
			public void onClick(DialogInterface dialog, int which) {

				//here you can add functions

			} });

		alertDialog.show();
		
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
}

package com.example.MyGame;

import android.os.Bundle;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.DialogInterface;

import android.util.Log;

import android.view.Menu;

public class MyActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

AlertDialog alertDialog = new AlertDialog.Builder(this).create();

Log.v("cocos2dx", "alert create ist done");

alertDialog.setIcon(R.drawable.icon);

alertDialog.setButton("OK", new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int which) {

//here you can add functions

} });

alertDialog.show();

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}

IOS

Well this is straight forward, we just have to provide a class like a bridge, which will be included only if the platform is IOS. In Xcode 4 for .mm extension just rename your .cpp file.


#ifndef IOSHELPER_H_
#define IOSHELPER_H_

#include 
using namespace std;

class IOSHelper {
public:
    
    string nativeCallback(string str,void(*callback)(int index));
    
    IOSHelper();
    virtual ~IOSHelper();
};

#endif /* IOSHELPER_H_ */

#ifndef IOSHELPER_H_

#define IOSHELPER_H_

#include

using namespace std;

class IOSHelper {

public:

string nativeCallback(string str,void(*callback)(int index));

IOSHelper();

virtual ~IOSHelper();

};

#endif /* IOSHELPER_H_ */


  #include "IOSHelper.h"


string IOSHelper::nativeCallbackTest(string str,void(*callback)(int index)){
    
    UIAlertView* message=[[UIAlertView alloc] initWithTitle:@"Hello"
                                                    message:@"ABC"
                                                   delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
    
    [message show];
    callback(99);
    
    return str;
}

IOSHelper::IOSHelper() {
	// TODO Auto-generated constructor stub
    
}

IOSHelper::~IOSHelper() {
	// TODO Auto-generated destructor stub
}

#include "IOSHelper.h"

string IOSHelper::nativeCallbackTest(string str,void(*callback)(int index)){

UIAlertView* message=[[UIAlertView alloc] initWithTitle:@"Hello"

message:@"ABC"

delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];

[message show];

callback(99);

return str;

}

IOSHelper::IOSHelper() {

// TODO Auto-generated constructor stub

}

IOSHelper::~IOSHelper() {

// TODO Auto-generated destructor stub

}

This entry was posted in Cocos2D-X and tagged cocos2dx call ios method,cocos2dx call jni method,cocos2dx native android on July 21, 2013