Rounded corners cardView don't work in RecyclerView - Android?

It turns out that calling View.setBackgroundColor(int) on a CardView removes the rounded corners.

To change the background colour of a card and retain the corners, one needs to call CardView.setCardBackgroundColor(int) instead.

That may be the case for certain visitors to this post.

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When subclassing CardView, I suggest adding the following method to protect your corners from accidental removal:

/**
 * Override prevents {@link View#setBackgroundColor(int)} being called,
 * which removes the rounded corners.
 */
@Override
public void setBackgroundColor(@ColorInt int backgroundColor) {
    setCardBackgroundColor(backgroundColor);
}

In particular, I was working on a custom view implementation for React Native, and React was automatically applying a background colour to the view. This override solved that problem; it means other developers do not need to know the details of the underlying view.

use this in topmost layout declaration in xml layout file:

xmlns:card_view="http://schemas.android.com/apk/res-auto"

This solved the problem for me.

Try adding this two attributes in your card view

card_view:cardPreventCornerOverlap="false"
card_view:cardUseCompatPadding="true"

Here is the documentation for the first attribute (which contains reference to the second) https://developer.android.com/reference/android/support/v7/widget/CardView.html#setPreventCornerOverlap(boolean)

This should do the trick