Android自定义视图属性-不允许使用“颜色"作为属性名称 [英] Android custom view attributes - 'color' as attribute name disallowed

问题描述

我已经制作了一个简单的自定义视图，即"ColorSwatch".它是圆形的，显示分配的颜色，如果该颜色具有透明性，则将该颜色绘制在检查图案的顶部.视图工作正常.

I've made a simple custom view, a "ColorSwatch". It's circular, shows the assigned color and if that color has transparency, the color is drawn atop a checker pattern. The view works fine.

我的问题是，当我为色板定义自定义属性(在values/attrs_color_swatch_view.xml中)时，无法指定名为"color"的属性.编译器抱怨已经定义了颜色，并把我指向了colors.xml文件.作为解决方法，我调用了参数swatchColor，但我希望它只是color.

My problem is that when I define the custom attributes for the swatch (in values/attrs_color_swatch_view.xml), I can't specify an attribute named "color". The compiler complains that color is already defined, and points me to my colors.xml file. As a workaround, I called the parameter swatchColor, but I'd prefer it to simply be color.

文件:values/attrs_color_swatch_view.xml

<resources>
    <declare-styleable name="ColorSwatchView">
        <attr name="swatchColor" format="color"/><!-- would prefer to simply be 'color', not 'swatchColor' -->
        <attr name="selectionThickness" format="dimension"/>
        <attr name="isSelected" format="boolean"/>
        <attr name="selectionColor" format="color"/>
        <attr name="alphaCheckerSize" format="dimension" />
    </declare-styleable>
</resources>

是否可以使用属性名称color?还是保留关键字?在我看来，有什么方法可以对其命名空间吗?

Is there a way to use the attribute name color? Or is it a reserved keyword? Is there a way to namespace it somehow to my view?

推荐答案

出于与不能使用background相同的原因，您不能使用color.它们已经在android名称空间中定义.

You can't use color for the same reason you can't use background. They are already defined in the android namespace.

那么如何使用color或任何其他保留的属性名称?通过使用已定义的内容，而不创建新的内容.

So how to use color or any other attribute name that's reserved ? By using the ones that's already defined, and not creating new ones.

而不是:

<attr name="swatchColor" format="color"/>

使用此:

<attr name="android:color"/>

始终确保您使用android提供的功能.只有在您认为它不适合您的需求时，才继续创建您自己的属性.

Always make sure that you use the ones supplied by android. Only if you think it doesn't suit your needs, go ahead and create your own attribute.

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