将整数颜色值转换为 RGB [英] Convert integer color value to RGB

问题描述

我正在尝试修改第三方软件.我想使用由某些方法(我无法修改)返回的颜色作为整数.但是，我想使用 RGB 格式，例如#FF00FF.如何进行转换?

I am trying to modify a third party software. I want to use a color which is returned by some methods (which I cant modifiy) as an integer. However, I would like to use RGB format, like #FF00FF. How can I make a conversion?

这是一个 HTML 示例 http://www.shodor.org/stella2java/rgbint.html我想在 Android 上用 Java 归档相同的内容.

Here is an HTML example http://www.shodor.org/stella2java/rgbint.html I would like to archive same thing in Java, on Android.

推荐答案

使用这个

String hexColor = String.format("#%06X", (0xFFFFFF & intColor));

我们知道 HEX 中颜色值的长度是 6.所以你在这里看到 6.%06X 匹配来自 (0xFFFFFF & intColor) 的结果，如果长度小于 6，则通过在结果的左侧附加零来使结果为 6.你会看到 #，所以这个 # 字符被附加到结果中，最后你会得到一个十六进制颜色值.

We know lenght of color value in HEX is 6. So you see 6 here. %06X matches the result coming from (0xFFFFFF & intColor) and if length is less than 6, it makes result with 6 by appending ZERO to left side of result. And you see #, so this # char gets appended to result and finally you get a HEX COLOR value.

自 API 26 起更新

Update since API 26

自 API 26 起，新方法 Color.valueOf(....) 出于类似的原因被引入来转换颜色.你可以像

Since API 26, new methods Color.valueOf(....) has been introduced to convert colors for similar reason. you can use it like

// sRGB
Color opaqueRed = Color.valueOf(0xffff0000); // from a color int
Color translucentRed = Color.valueOf(1.0f, 0.0f, 0.0f, 0.5f);

// Wide gamut color
ColorSpace sRgb = ColorSpace.get(ColorSpace.Named.SRGB);
@ColorLong long p3 = Color.pack(1.0f, 1.0f, 0.0f, 1.0f, sRgb);
Color opaqueYellow = Color.valueOf(p3); // from a color long

// CIE L*a*b* color space
ColorSpace lab = ColorSpace.get(Named.CIE_LAB);
Color green = Color.valueOf(100.0f, -128.0f, 128.0f, 1.0f, lab);

mView.setBackgroundColor(opaqueRed.toArgb());
mView2.setBackgroundColor(green.toArgb());
mView3.setBackgroundColor(translucentRed.toArgb());
mView4.setBackgroundColor(opaqueYellow.toArgb());

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