react-native: Elevation and border radius do not work well with opacity from Android 9

Using backgroundColor: '#fff' sets it right and works as expected.

I found that this problem occur when changing opacity on a wrapping element that contain child elements using elevation for shadow. What fixed this bug for me temporarily was to set flag needsOffscreenAlphaCompositing on the wrapping element that i animated opacity style prop for. (For best practice usage check: https://reactnative.dev/docs/view#needsoffscreenalphacompositing) Otherwise setting opacity on each of the child elements should also work, instead of only the parent wrapper.

This was mentioned here: https://github.com/facebook/react-native/issues/23090#issuecomment-669157170

I discovered a simple way to fix the problem, which is adding an opacity property to the child component to overide the effect done by the parent element, such as opacity: 0.99;, see if it works for you.

Using backgroundColor: '#fff' sets it right and works as expected.

worked for me, what happened was my component was transparent hence i can see whats happening in the back, setting a background color makes it work as intended

The problem is that if you lower or animate the opacity of this element, fading it out, the background color doesn’t help. You can still see the shadow being rendered underneath, like a thick border.

Using backgroundColor: '#fff' sets it right and works as expected.

worked for me, what happened was my component was transparent hence i can see whats happening in the back, setting a background color makes it work as intended

Facing this issue with RN 0.59.8 as well.

Seems like needsOffscreenAlphaCompositing isn’t working for me. Anyone else encountered and sorted this?

@ferrannp hello sir, is there anyways to make this bug more priority. I am waiting for this too long sir.

Still facing the issue on RN 0.60.4

Still not work well.

Seems like the issue is reproducible only on Android version 9.0 (I was testing that bug also on Android version 7.0 and 8.1 where it looks properly).

Still an issue.

Setting backgroundColor: '#fff' works.

Using @simongoot solution, needsOffscreenAlphaCompositing worked great. In case someone else has the problem with a TouchableOpacity, where needsOffscreenAlphaCompositing did not work for me. You can replace the TouchableOpacity with an Animated Presseable and then animate the opacity via onPressIn and onPressOut.

import { Pressable, Animated } from 'react-native';
const AnimatedPressable = Animated.createAnimatedComponent(Pressable);

const Button = ({children}) => {
  const animatedButtonOpacity = useRef(new Animated.Value(1));
  
  const buttonOpacity = {
    opacity: animatedButtonOpacity.current
  };
  return (
    <>
      {properties.map((property, index) => (
        <AnimatedPressable
          onPressIn={() => animatedButtonOpacity.current.setValue(0.5)}
          onPressOut={() => animatedButtonOpacity.current.setValue(1)}
          onPres={...}
          style={buttonOpacity}
          needsOffscreenAlphaCompositing
        >
          {children}
        </AnimatedPressable>
      ))}
    </>
  );
};

I think this is related to https://github.com/facebook/react-native/issues/23090 and https://github.com/react-navigation/react-navigation/issues/5535.

I discovered a simple way to fix the problem, which is adding an opacity property to the child component to overide the effect done by the parent element, such as opacity: 0.99;, see if it works for you.

This does not work for me, is there already another fix? (Expect from using two View components (one for shadow and one for the background color with opacity))