android 颜色(color)
16lz
2021-01-23
SDK文档定义如下:
The Color class defines methods for creating and converting color ints. Colors are represented as packed ints, made up of 4 bytes: alpha, red, green, blue. The values are unpremultiplied, meaning any transparency is stored solely in the alpha component, and not in the color components. The components are stored as follows (alpha << 24) | (red << 16) | (green << 8) | blue. Each component ranges between 0..255 with 0 meaning no contribution for that component, and 255 meaning 100% contribution. Thus opaque-black would be 0xFF000000 (100% opaque but no contributions from red, green, or blue), and opaque-white would be 0xFFFFFFFF
Alpha通道是一个8位的灰度通道，该通道用256级灰度来记录图像中的透明度信息，定义透明、不透明和半透明区域，其中黑表示全透明，白表示不透明，灰表示半透明。
public static final intBLACK
Since: API Level 1Constant Value:-16777216 (0xff000000)
public static final intBLUE
Since: API Level 1Constant Value:-16776961 (0xff0000ff)
public static final intCYAN
Since: API Level 1Constant Value:-16711681 (0xff00ffff)
public static final intDKGRAY
Since: API Level 1Constant Value:-12303292 (0xff444444)
public static final intGRAY
Since: API Level 1Constant Value:-7829368 (0xff888888)
public static final intGREEN
Since: API Level 1Constant Value:-16711936 (0xff00ff00)
public static final intLTGRAY
Since: API Level 1Constant Value:-3355444 (0xffcccccc)
public static final intMAGENTA
Since: API Level 1Constant Value:-65281 (0xffff00ff)
public static final intRED
Since: API Level 1Constant Value:-65536 (0xffff0000)
public static final intTRANSPARENT
Since: API Level 1Constant Value:0 (0x00000000)
public static final intWHITE
Since: API Level 1Constant Value:-1 (0xffffffff)
public static final intYELLOW
Since: API Level 1Constant Value:-256 (0xffffff00)
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