设置 Android Studio 预览背景色

Question

I'm creating a custom view that is supposed to go on top of my other views inside a normal layout/view. I want it to be a half-transparent white color, so that what's behind it is still visible and I want it to contain fully solid white borders and white font color. On a black/dark background, this is easily readable. However, in the preview, which has a white background, I'm not able to see anything.

Is there a way to change the background color of the preview, so that I can't test the look of my custom view?

If possible, I'd like to achieve that without adding unnecessary components that imitate a black background.

Answer 1

Ok, I just stumbled over it by accident:

Put xmlns:tools="http://schemas.android.com/tools in the root xml bracket of your layout.

After that, you can use tools:background= to set your background as you like it. This also works with other attributes.