java - libGDX about OrthographicCamera -

i'm trying game mega jump.

now have problem: have no idea how on devices same number of columns items. , how player opposite of screen if reaches screen end.

i'm working whith orthographiccamera , box2d.

for devices use viewports , screen end should calculate dimensions(gdx.graphics.getwidth or gdx.graphics.getheight). player should actor create stage , group, add group stage , actor group. hope may you.