Android - setBackgroundColor int value too large?

Question

I'm trying to understand something about this method, setBackgroundColor(int) in android.

I keep seeing people say that to use it with hex values, you should do

0xFF000000 + 0x[6 digit hex value that you want]

But, and correct me if I'm wrong, isn't 0xFFFFFFFF, a legal input to the function, larger than the maximum size of an integer? Why am I allowed to put it in as input? Is it because of two's complement cutting the max size of integers in half?

setBacgroundColor(getResources().getColor(R.color.red)) – Illegal Argument Oct 22 '14 at 04:27 — Illegal Argument, Oct 22 '14 at 04:27

score 2 · Answer 1 · edited May 23 '17 at 10:33

2

This is not #RRGGBB format. Its actually 0xAARRGGBB format.

AA is for transparency (Alpha). And RR is the red, GG is the green, and BB is the blue component. This is hexadecimal, so the values range from 00 to FF (255).

You can also refer to: Why is Java able to store 0xff000000 as an int?

edited May 23 '17 at 10:33

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answered Oct 22 '14 at 04:28

MysticMagicϡ

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Thank you - I was primarily asking about why java is able to store that as an integer. I understand how the hex thing works inside that function but was confused on the semantics of the hex to int thing. – user3475234 Oct 22 '14 at 04:31
@user3475234 That link will explain that :) – MysticMagicϡ Oct 22 '14 at 04:31

Android - setBackgroundColor int value too large?

1 Answers1