Cocos2d-x android back button

Cocos2d-x 3.x version,

if use android back button,
in scene class add this code.
(I add this code on 'init' function)
this->setKeypadEnabled(true);

And add event listener

void className::onKeyReleased(cocos2d::EventKeyboard::KeyCode keycode, cocos2d::Event* e)
{
if(EventKeyboard::KeyCode::KEY_MENU == keycode)
{
//do something
}
if(EventKeyboard::KeyCode::KEY_BACK == keycode)
{
//do something
}

}

if you want example code

//this->setKeypadEnabled(true);
https://github.com/pineoc/robot-puzzle/blob/master/Classes/p1Scene.cpp#L115,

//event listener
https://github.com/pineoc/robot-puzzle/blob/master/Classes/p1Scene.cpp#L205

This project make puzzle game
:)

good luck make games