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androidcolor-codes

Color opacity in Android XML

Android color code is 8-digit hex code like #ff123456. First 2 digits are for opacity and rest of them are the general RGB color code. And the opacity value is optional assuming it is 0xff.

My question is, for a given color value, say:

<color name="vivid_red">#ffff0000</color>

Or

<color name="vivid_red">#ff0000</color>

Can I set a color with opacity 50% by referring a color value vivid_red, or should I define different color codes while their RGB parts are all the same, but only opacity parts are different?

Solution

  • If it's XML, it will only be able to distinguish what you mean in your usage by the name of the element, unless you have some other code that parses the color element for a particular name attribute.

    So,

    <color name="vivid_red">#ff0000</color>

    and

    <color name="vivid_red_half_trans">#80ff0000</color>