RippleDrawable面膜颜色是什么? [英] RippleDrawable mask color, what is it for?

问题描述

在提及Android L的RippleDrawable时， https://developer.android.com/reference/android/graphics/drawable/RippleDrawable.html 中，有一种方法可以掩盖视图中的波纹效果.遮罩的完成方式是

In referring to the RippleDrawable for Android L, https://developer.android.com/reference/android/graphics/drawable/RippleDrawable.html, there's a way to mask away to contain the ripple effect within the view. The masking is done as

<ripple android:color="#ff0000ff">
    <item android:drawable="@drawable/white" />
</ripple>

我们也可以使用

<ripple android:color="#ff0000ff">
    <item android:drawable="@drawable/black" />
</ripple>

如文档中所述，遮罩层不是在屏幕上绘制的，而只是掩盖了波纹效果.我很好奇，为什么要在那里设置一种颜色(白色或黑色或其他颜色)?我们是否有任何重要意义将颜色设置为遮罩"，或者确实有任何值可以做到?

As mentioned in the document, the mask layer is not drawn on the screen, but just masking away the ripple effect. I'm curious, why should one set a color (White or Black or anything) there? Is there any significant of us setting a color as the Mask, or it is indeed any value will do?

希望有人启发...谢谢！

Hopes someone enlighten... thanks!

推荐答案

使用不透明的颜色作为蒙版-不管是@android:color/white，#ff000000还是#ff123456都不重要-表示您正在蒙版与完全不透明的矩形相对应，该矩形与您的可绘制对象具有相同的大小.这是波纹遮罩的最有效渲染路径.

Using an opaque color for your mask -- whether that's @android:color/white, #ff000000, or #ff123456 doesn't matter -- means you are masking against a fully opaque rectangle that is the same size as your drawable. It's the most efficient rendering path for ripple masks.

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