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Does changing background color in android destroy the widget's appearance?

问题描述:

I've noticed that changing the background color of an android widget (ex. Button or TextView) by program:

myButton.setBackgroundColor(Color.BLUE);

makes it to loose its 3D shape, border, and shadows effects, and then appears like a ugly flat square. What am I missing?

Sorry for the very naive question but I couldn't get it right although tried for a time.

网友答案:

Rounded corners, shadow effects, etc are often accomplished in Android by using images. See this developer documentation for an explanation of how that works.

A widget can have either an image background, or a solid color background. So, by setting the background color you are override the background image. If you want to change the color without losing everything else, you need to edit the image files.

网友答案:

See:

  • How to set background color of a View
  • Is it possible to have a Button with a background image with text on top?
  • How to gradient fill a button's background?
  • Problem with EditText background (android)
网友答案:

Since background is a drawable, you can modify the drawable to change the color:

myButton.getBackground().setColorFilter(Color.BLUE, PorterDuff.Mode.SRC_ATOP);
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