如何根据它覆盖的 ImageView 的颜色更改文本的颜色?

How can I change the color of my text based on the color of the ImageView it overlays?(如何根据它覆盖的 ImageView 的颜色更改文本的颜色?)

问题描述

所以我在用户上传的 ImageView 上设置了带有白色文本标签的透明按钮.如果用户上传的图片大部分是白色的，那么按钮如果不是完全不可见就很难看到.

有谁知道获取 ImageView 的源图片/drawable 的平均颜色的方法吗?如果我能做到这一点，我可以将它与我可以反复试验的某个阈值进行比较......如果我能得到这个，那么我可以将按钮上的文本颜色更改为这种颜色的反转版本...还是什么??

只是想吐在这里..

当然，如果有人知道更好的方法，将不胜感激更多信息，谢谢！！

你可以使用

So I've got transparant buttons with white text labels set up over a user uploaded ImageView. If the user uploads an image that is mostly white, then the buttons are hard to see if not completely invisible.

Does anyone know of a way to get the average color of a ImageView's source picture/drawable? If I can do this, I can compare it to a certain threshold I can trial and error for... If I can get this, then I can change the color of the text on my buttons to the inverted version of this color...or something??

Just idea spitting here..

And of course, if someone knows a better way, more info would be much appreciated, thanks!!

You could use the Palette class.

From the developers guide:

You can retrieve the prominent colors from the image using the getter methods in the Palette class, such as Palette.getVibrantColor().

Palette.from() expects a Bitmap param, so you'll have to get it from your ImageView.

Something like this should work:

Bitmap bitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap();
Palette colorPalette = Palette.from(bitmap).generate();

And then you can call the appropriate methods on this Palette instance to get the prominent colors, for example:

int darkVibrantColor = colorPalette.getDarkVibrantColor(someDefaultColor);

Check out this example screenshot on how the Palette class recognizes colors:

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