Android中颜色值是通过红(Red)、绿(Green)、蓝 (Blue)三原色，以及一个透明度(Alpha)值来表示的，颜色值总是以井号(#)开头，接下来就是Alpha-Red-Green-Blue的形 式。其中Alpha值可以省略，如果省略了Alpha的值，那么该颜色默认是完全不透明的。
Android的颜色值支持常见的四种形式如下所示：
- #RGB:分别指定红、绿、蓝三原色的值（只支持0~f这16级颜色）来代表颜色。
- #ARGB:分别指定红、绿、蓝三原色的值(只支持0~f这16级颜色)及透明度(只支持0~f这16级透明度)来代表颜色。
- #RRGGBB:分别指定红、绿、蓝三原色的值（支持00~ff这256级颜色）来代表颜色。
- #AARRGGBB:分别指定红、绿、蓝三原色的值(支持00~fff这256级颜色)及透明度(支持00~fff这256级透明度)来代表颜色。
上面四种形式中，A、R、G、B都代表一个十六进制的数，其中A代表透明度，R代表红色的数值，G代表绿色数值，B代表蓝色数值。
附：
RGB颜色对照表
| #FFFFFF | #FFFFF0 | #FFFFE0 | #FFFF00 |
| #FFFAFA | #FFFAF0 | #FFFACD | #FFF8DC |
| #FFF68F | #FFF5EE | #FFF0F5 | #FFEFDB |
| #FFEFD5 | #FFEC8B | #FFEBCD | #FFE7BA |
| #FFE4E1 | #FFE4C4 | #FFE4B5 | #FFE1FF |
| #FFDEAD | #FFDAB9 | #FFD700 | #FFD39B |
| #FFC1C1 | #FFC125 | #FFC0CB | #FFBBFF |
| #FFB90F | #FFB6C1 | #FFB5C5 | #FFAEB9 |
| #FFA54F | #FFA500 | #FFA07A | #FF8C69 |
| #FF8C00 | #FF83FA | #FF82AB | #FF8247 |
| #FF7F50 | #FF7F24 | #FF7F00 | #FF7256 |
| #FF6EB4 | #FF6A6A | #FF69B4 | #FF6347 |
| #FF4500 | #FF4040 | #FF3E96 | #FF34B3 |
| #FF3030 | #FF1493 | #FF00FF | #FF0000 |
| #FDF5E6 | #FCFCFC | #FAFAFA | #FAFAD2 |
| #FAF0E6 | #FAEBD7 | #FA8072 | #F8F8FF |
| #F7F7F7 | #F5FFFA | #F5F5F5 | #F5F5DC |
| #F5DEB3 | #F4F4F4 | #F4A460 | #F2F2F2 |
| #F0FFFF | #F0FFF0 | #F0F8FF | #F0F0F0 |
| #F0E68C | #F08080 | #EEEEE0 | #EEEED1 |
| #EEEE00 | #EEE9E9 | #EEE9BF | #EEE8CD |
| #EEE8AA | #EEE685 | #EEE5DE | #EEE0E5 |
| #EEDFCC | #EEDC82 | #EED8AE | #EED5D2 |
| #EED5B7 | #EED2EE | #EECFA1 | #EECBAD |
| #EEC900 | #EEC591 | #EEB4B4 | #EEB422 |
| #EEAEEE | #EEAD0E | #EEA9B8 | #EEA2AD |
| #EE9A49 | #EE9A00 | #EE9572 | #EE82EE |
| #EE8262 | #EE7AE9 | #EE799F | #EE7942 |
| #EE7621 | #EE7600 | #EE6AA7 | #EE6A50 |
| #EE6363 | #EE5C42 | #EE4000 | #EE3B3B |
| #EE3A8C | #EE30A7 | #EE2C2C | #EE1289 |
| #EE00EE | #EE0000 | #EDEDED | #EBEBEB |
| #EAEAEA | #E9967A | #E8E8E8 | #E6E6FA |
| #E5E5E5 | #E3E3E3 | #E0FFFF | #E0EEEE |
| #E0EEE0 | #E0E0E0 | #E066FF | #DEDEDE |
| #DEB887 | #DDA0DD | #DCDCDC | #DC143C |
| #DBDBDB | #DB7093 | #DAA520 | #DA70D6 |
| #D9D9D9 | #D8BFD8 | #D6D6D6 | #D4D4D4 |
| #D3D3D3 | #D2B48C | #D2691E | #D1EEEE |
| #D1D1D1 | #D15FEE | #D02090 | #CFCFCF |
| #CDCDC1 | #CDCDB4 | #CDCD00 | #CDC9C9 |
| #CDC9A5 | #CDC8B1 | #CDC673 | #CDC5BF |
| #CDC1C5 | #CDC0B0 | #CDBE70 | #CDBA96 |
| #CDB7B5 | #CDB79E | #CDB5CD | #CDB38B |
| #CDAF95 | #CDAD00 | #CDAA7D | #CD9B9B |
| #CD9B1D | #CD96CD | #CD950C | #CD919E |
| #CD8C95 | #CD853F | #CD8500 | #CD8162 |
| #CD7054 | #CD69C9 | #CD6889 | #CD6839 |
| #CD661D | #CD6600 | #CD6090 | #CD5C5C |
| #CD5B45 | #CD5555 | #CD4F39 | #CD3700 |
| #CD3333 | #CD3278 | #CD2990 | #CD2626 |
| #CD1076 | #CD00CD | #CD0000 | #CCCCCC |
| #CAFF70 | #CAE1FF | #C9C9C9 | #C7C7C7 |
| #C71585 | #C6E2FF | #C67171 | #C5C1AA |
| #C4C4C4 | #C2C2C2 | #C1FFC1 | #C1CDCD |
| #C1CDC1 | #C1C1C1 | #C0FF3E | #BFEFFF |
| #BFBFBF | #BF3EFF | #BEBEBE | #BDBDBD |
| #BDB76B | #BCEE68 | #BCD2EE | #BC8F8F |
| #BBFFFF | #BABABA | #BA55D3 | #B9D3EE |
| #B8B8B8 | #B8860B | #B7B7B7 | #B5B5B5 |
| #B4EEB4 | #B4CDCD | #B452CD | #B3EE3A |
| #B3B3B3 | #B2DFEE | #B23AEE | #B22222 |
| #B0E2FF | #B0E0E6 | #B0C4DE | #B0B0B0 |
| #B03060 | #AEEEEE | #ADFF2F | #ADD8E6 |
| #ADADAD | #ABABAB | #AB82FF | #AAAAAA |
| #A9A9A9 | #A8A8A8 | #A6A6A6 | #A52A2A |
| #A4D3EE | #A3A3A3 | #A2CD5A | #A2B5CD |
| #A1A1A1 | #A0522D | #A020F0 | #9FB6CD |
| #9F79EE | #9E9E9E | #9C9C9C | #9BCD9B |
| #9B30FF | #9AFF9A | #9ACD32 | #9AC0CD |
| #9A32CD | #999999 | #9932CC | #98FB98 |
| #98F5FF | #97FFFF | #96CDCD | #969696 |
| #949494 | #9400D3 | #9370DB | #919191 |
| #912CEE | #90EE90 | #8FBC8F | #8F8F8F |
| #8EE5EE | #8E8E8E | #8E8E38 | #8E388E |
| #8DEEEE | #8DB6CD | #8C8C8C | #8B8B83 |
| #8B8B7A | #8B8B00 | #8B8989 | #8B8970 |
| #8B8878 | #8B8682 | #8B864E | #8B8386 |
| #8B8378 | #8B814C | #8B7E66 | #8B7D7B |
| #8B7D6B | #8B7B8B | #8B795E | #8B7765 |
| #8B7500 | #8B7355 | #8B6969 | #8B6914 |
| #8B668B | #8B6508 | #8B636C | #8B5F65 |
| #8B5A2B | #8B5A00 | #8B5742 | #8B4C39 |
| #8B4789 | #8B475D | #8B4726 | #8B4513 |
| #8B4500 | #8B3E2F | #8B3A62 | #8B3A3A |
| #8B3626 | #8B2500 | #8B2323 | #8B2252 |
| #8B1C62 | #8B1A1A | #8B0A50 | #8B008B |
| #8B0000 | #8A8A8A | #8A2BE2 | #8968CD |
| #87CEFF | #87CEFA | #87CEEB | #878787 |
| #858585 | #848484 | #8470FF | #838B8B |
| #838B83 | #836FFF | #828282 | #7FFFD4 |
| #7FFF00 | #7F7F7F | #7EC0EE | #7D9EC0 |
| #7D7D7D | #7D26CD | #7CFC00 | #7CCD7C |
| #7B68EE | #7AC5CD | #7A8B8B | #7A7A7A |
| #7A67EE | #7A378B | #79CDCD | #787878 |
| #778899 | #76EEC6 | #76EE00 | #757575 |
| #737373 | #71C671 | #7171C6 | #708090 |
| #707070 | #6E8B3D | #6E7B8B | #6E6E6E |
| #6CA6CD | #6C7B8B | #6B8E23 | #6B6B6B |
| #6A5ACD | #698B69 | #698B22 | #696969 |
| #6959CD | #68838B | #68228B | #66CDAA |
| #66CD00 | #668B8B | #666666 | #6495ED |
| #63B8FF | #636363 | #616161 | #607B8B |
| #5F9EA0 | #5E5E5E | #5D478B | #5CACEE |
| #5C5C5C | #5B5B5B | #595959 | #575757 |
| #556B2F | #555555 | #551A8B | #54FF9F |
| #548B54 | #545454 | #53868B | #528B8B |
| #525252 | #515151 | #4F94CD | #4F4F4F |
| #4EEE94 | #4D4D4D | #4B0082 | #4A708B |
| #4A4A4A | #48D1CC | #4876FF | #483D8B |
| #474747 | #473C8B | #4682B4 | #458B74 |
| #458B00 | #454545 | #43CD80 | #436EEE |
| #424242 | #4169E1 | #40E0D0 | #404040 |
| #3D3D3D | #3CB371 | #3B3B3B | #3A5FCD |
| #388E8E | #383838 | #36648B | #363636 |
| #333333 | #32CD32 | #303030 | #2F4F4F |
| #2E8B57 | #2E2E2E | #2B2B2B | #292929 |
| #282828 | #27408B | #262626 | #242424 |
| #228B22 | #218868 | #212121 | #20B2AA |
| #1F1F1F | #1E90FF | #1E1E1E | #1C86EE |
| #1C1C1C | #1A1A1A | #191970 | #1874CD |
| #171717 | #141414 | #121212 | #104E8B |
| #0F0F0F | #0D0D0D | #0A0A0A | #080808 |
| #050505 | #030303 | #00FFFF | #00FF7F |
| #00FF00 | #00FA9A | #00F5FF | #00EEEE |
| #00EE76 | #00EE00 | #00E5EE | #00CED1 |
| #00CDCD | #00CD66 | #00CD00 | #00C5CD |
| #00BFFF | #00B2EE | #009ACD | #008B8B |
| #008B45 | #008B00 | #00868B | #00688B |
| #006400 | #0000FF | #0000EE | #0000CD |
| #0000AA | #00008B | #000080 | #000000 |
