Android UI 的 ARGB

ARGB 即 Alpha + RGB
*** Alpha = Opacity = (100% - transparent) ***
Alpha 的值表示透明度，FF 表示不透明，00 表示全透明。
Alpha 百分比对应十六进制值：

100%  FF
 99%  FC
 98%  FA
 97%  F7
 96%  F5
 95%  F2
 94%  F0
 93%  ED
 92%  EB
 91%  E8
 90%  E6
 89%  E3
 88%  E0
 87%  DE
 86%  DB
 85%  D9
 84%  D6
 83%  D4
 82%  D1
 81%  CF
 80%  CC
 79%  C9
 78%  C7
 77%  C4
 76%  C2
 75%  BF
 74%  BD
 73%  BA
 72%  B8
 71%  B5
 70%  B3
 69%  B0
 68%  AD
 67%  AB
 66%  A8
 65%  A6
 64%  A3
 63%  A1
 62%  9E
 61%  9C
 60%  99
 59%  96
 58%  94
 57%  91
 56%  8F
 55%  8C
 54%  8A
 53%  87
 52%  85
 51%  82
 50%  80
 49%  7D
 48%  7A
 47%  78
 46%  75
 45%  73
 44%  70
 43%  6E
 42%  6B
 41%  69
 40%  66
 39%  63
 38%  61
 37%  5E
 36%  5C
 35%  59
 34%  57
 33%  54
 32%  52
 31%  4F
 30%  4D
 29%  4A
 28%  47
 27%  45
 26%  42
 25%  40
 24%  3D
 23%  3B
 22%  38
 21%  36
 20%  33
 19%  30
 18%  2E
 17%  2B
 16%  29
 15%  26
 14%  24
 13%  21
 12%  1F
 11%  1C
 10%  1A
  9%  17
  8%  14
  7%  12
  6%  0F
  5%  0D
  4%  0A
  3%  08
  2%  05
  1%  03
  0%  00