im building now a apk with a orange bg for android as intelxdk tutorial compiling should do, then il try one with the cordova package inside
im using the same size as you 400x240 and leterboxscale with landscape locked.
give me a moment.
Edited1: same results as you said on 400x240 its missing like 20 pixels each side... but then i guess the aspect ratio is not 16:9 or 16:10 ... that is the issue you have... that 400x240 it should be 480x260 if im not mistaken
let me add another 20 pixels and make it 420 x240
Edited2: yep so its the aspect ratio you need to follow the 16:9 or 16:10 what ever the size of 440 x240 is .. i did the test on the size of 420x240 and the margins are shorter then before, they now missing like 10 pixels ... so im guessing just increase the width of your project to 430x240 or 440x240 if that is not a big replacement for you project system, but its only 30 - 40 px difference shouldn't make a big of a difference. unless you have everything scaled down to 1 pixel movement.
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430x240 should fix the margins... however to be more safe you can try 440x240
since i never seen a 4:3 aspect ratio mobile phone... maybe ipads or tablets are squarish.. but not mobiles...
Which leads to think that this is a bug in android.
I mean the loss of the full screen using 400x240.
It is not normal that the first time you run you have full screen but if you do "close all" then you lose the full screen.
I have to evaluate 440x240.
Thanks for the test!