android使用 ARGB颜色
A表示 alpha 透明
Alpha component [0..255] of the color |
Red component [0..255] of the color |
Green component [0..255] of the color |
Blue component [0..255] of the color |
ARGB color占四个字节,可以int或16进制数表示
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black --- Value: -16777216 (0xff000000)
green --- Value: -16711936 (0xff00ff00)