Hex Colors in Android are some times 8 digits. How? What is the difference between #FFFFFF and #FFFFFF00

Question

I sometimes have seen in examples where the coloring in Android is done as #FF191919. I mean a 8 digit hex number . But it should be only a 6 digit number. How are they rela

Answer 1

The extra 2 digits are used to define the colors transparency, or alpha channel.

Android uses the ARGB format (or AARRGGBB as you use in your example)

For more (Android-specific) information take a look at the Color documentation