local logo = display.newImage( "logo.png", 160, 240 )
function logo:enterFrame(event)
        -- do something like make the logo bounce around the edges of the screen 
end
 
Runtime:addEventListener( "enterFrame", logo );
 
function logo:tap( event )
        if logo.isPaused then -- initially nil which is false anyways
                Runtime:removeEventListener( "enterFrame", self )
        else
                Runtime:addEventListener( "enterFrame", self )
        end
        return true -- we handled the event so don't propagate
end
 
logo:addEventListener( "tap", logo )

local path = system.pathForFile( "data.txt", system.DocumentsDirectory )
 
-- io.open opens a file at path. returns nil if no file found
local file = io.open( path, "r" )
if file then
   -- read all contents of file into a string
   local contents = file:read( "*a" )
   print( "Contents of " .. path .. "\n" .. contents )
   io.close( file )
else
   -- create file b/c it doesn't exist yet
   file = io.open( path, "w" )
   local numbers = {1,2,3,4,5,6,7,8,9}
   file:write( "Feed me data!\n", numbers[1], numbers[2], "\n" )
   for _,v in ipairs( numbers ) do file:write( v, " " ) end
   file:write( "\nNo more data\n" )
   io.close( file )
end

local function shouldResume()
        -- return true or false depending on whether we need to resume
end
 
local function onSystemEvent( event )
        if event.type == "applicationExit" then
                -- save stuff to disk
        elseif event.type == "applicationStart" then
                if shouldResume() then 
                        -- load stuff off disk
                else
                        -- start app up normally
                end
        end
end
 
Runtime:addEventListener( "system", onSystemEvent );