'No, boy: I was just playing' = 'No, chico; solamente jugaba' 'No boy. I was just playing.' = 'Ningun chico. Solamente jugaba'. Punctuation makes a difference!
"I have been playing" is "He jugado".
Estoy jugando
diga no
Felton does not have a translation into Spanish. You'd say it just the same.
you just say hola
you just say hola
para jugando
Está jugando críquet.
Jugando con el Ipad.
the way you say "just" is unknown right now
Since Cheez-Its are a brand name, you just say Cheez-its in Spanish.