Going Back to a scene with Android 'Back' Button

Solar2D Android
#1

Hi. I wrote a code where if a user clicks on help button in menu, it goes to a scene where he can read the help info. When he clicks the back button, its supposed to go back to menu.

This is how I wrote the code in menu.lua for going to help screen. It worked fine.

local function gotoHelp()     composer.removeScene( "help" )     composer.gotoScene( "help" ) end helpButton:addEventListener( "tap", gotoHelp )

Now I wrote the code in help.lua in such a way that the user goes back to menu once he presses the back button.

-- Called when a key event has been received local function onKeyEvent( event ) -- If the "back" key was pressed on Android or Windows Phone, make sure it gets back to menu if ( event.keyName == "back" ) then local platformName = system.getInfo( "platformName" ) if ( platformName == "Android" ) or ( platformName == "WinPhone" ) then composer.removeScene( "menu" ) composer.gotoScene( "menu" ) end end return false end Runtime:addEventListener( "key", onKeyEvent )

But this one didn’t work. The game is just getting stopped from being exited but nothing else is happening.

Can anyone please help me?

#2

Hi karthik.cvr70,

In your key event listener, you’ll want to return true if the Back key was pressed. This tells the Android OS that you’re overriding the behavior of that key.

See our KeyEvents sample on GitHub for an example of this: https://github.com/coronalabs/samples-coronasdk/blob/master/Hardware/KeyEvents/main.lua#L72

#3

Hi karthik.cvr70,

In your key event listener, you’ll want to return true if the Back key was pressed. This tells the Android OS that you’re overriding the behavior of that key.

See our KeyEvents sample on GitHub for an example of this: https://github.com/coronalabs/samples-coronasdk/blob/master/Hardware/KeyEvents/main.lua#L72