When I change the background of a Card view, the corner radius is reset

Question

The situation is that when I modify a Card view background from a program then the corner radius of the Card view reset. But why?
(I don't think I need to provide any other information (code, picture of the result, etc.), because I think it's clear enough to understand. If you need more information then you should write down in a comment.)

score 29 · Accepted Answer · edited Jul 30 '18 at 08:25

29

If you try to use CardView with corner radius you will face this problem when you set background color dynamically. Please use yourCardView.setCardBackgroundColor() methord instead of yourCardView.setBackgroundColor() :)

edited Jul 30 '18 at 08:25

Amir Dora.

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answered Jul 30 '18 at 06:57

Dulanga

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score 6 · Answer 2 · answered Apr 15 '18 at 11:37

6

I found a solution to the question.
I needed to retrieve the background of the view and set its color, then I assigned the new background to the view.

Drawable backgroundOff = v.getBackground(); //v is a view
backgroundOff.setTint(defaultColor); //defaultColor is an int 
v.setBackground(backgroundOff);

(This answer helped: https://stackoverflow.com/a/18394982/9377499)

answered Apr 15 '18 at 11:37

Noel Nemeth

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Works like a charm for instance when you want to change color of every other `CardView` inside a `RecyclerView` and preserve rounded corners. During the process you are only able to access `CardView` elements as `android.view.View` *itemViews*, which have `setBackgroundColor()` method (it fails) but there is no `setCardBackgroundColor()` method available. – Theta Nov 27 '20 at 22:15

Mohamad Rezaei · Answer 3 · 2020-09-27T10:01:04.957

Same problem and fix the problem this way

At first, create the shape named in Drawable "shape_background_cardview" and this add below code

<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">

<solid android:color="@color/gray500" />
<corners android:radius="5dp" />

</shape>

step second, set the shape to the background CardView yourself

yourCardView.setBackgroundResource(R.drawable.shape_background_cardview);

GoodLuck

When I change the background of a Card view, the corner radius is reset

3 Answers3