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I sometimes have seen in examples where the coloring in Android is done as #FF191919. I mean an eight-digit hex number. But it should only be a six-digit number. How are they related?
If I want to convert a six-digit number to a eight-digit number, how can I do it? I mean convert #424242 to a eight-digit number coloring? What are the the details?
The extra two 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.