Android Resources - Color

#RGB
#ARGB
#RRGGBB
#AARRGGBB


<resources>
<color name="red">#f00</color>
<color name="blue">#0000ff</color>
<color name="green">#f0f0</color>
<color name="main_back_ground_color">#ffffff00</color>
</resources>


http://code.google.com/android/reference/android/R.color.html