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Android interpolate color - Attempt to invoke virtual method 'int java.lang.Double.intValue()' on a null object reference

See original GitHub issue

Description

I’m attempting to combine useAnimatedProps and interpolateColor with react-native-linear-gradient, everything works fine on iOS, however on Android I seem to get an exception.

I don’t think this is a react-native-linear-gradient issue to be clear, it looks like setProps sends null values even though the JS thread reports them as not being null;

// JS
11-18 09:46:50.445 12090 12298 I ReactNativeJS: { colors: [ -16763747, -14621774, -14024762 ] }
Native     @ReactProp(name=PROP_COLORS)
11-18 09:46:50.469 12090 12090 I System.out: [null,null,null]

Working version on iOS

Attempt to invoke virtual method 'int java.lang.Double.intValue()' on a null object reference
11-18 09:10:52.905  7892  7892 E unknown:ReactNative: 	at com.facebook.react.bridge.ReadableNativeArray.getInt(ReadableNativeArray.java:97)
11-18 09:10:52.905  7892  7892 E unknown:ReactNative: 	at com.BV.LinearGradient.LinearGradientView.setColors(LinearGradientView.java:51)
11-18 09:10:52.905  7892  7892 E unknown:ReactNative: 	at com.BV.LinearGradient.LinearGradientManager.setColors(LinearGradientManager.java:35)
11-18 09:10:52.905  7892  7892 E unknown:ReactNative: 	... 23 more

Steps To Reproduce

The Repository

The Component

Expected behavior

Animation works.

Actual behavior

App crashes with above exception. It looks like however reanimated v2 sets props on android, it results in sending [null,null,null].

Package versions

 "react-native": "0.63.3",
    "react-native-linear-gradient": "^2.5.6",
    "react-native-reanimated": "^2.0.0-alpha.9",

Issue Analytics

State:
Created 3 years ago
Comments:12 (8 by maintainers)

Top GitHub Comments

1reaction

karol-bisztygacommented, Nov 24, 2020

If you have your doubts, you can open a new issue with the question about what bothers you. Here we wanted to find out why the app crashes.

Thanks for cooperation and quick replies, best regards ✌️

0reactions

kyle-ssgcommented, Nov 24, 2020

Ok sure I guess this can be closed, I think I’m still a bit confused as to why I had to run Android prop updates via state / runOnJS (essentially an infinite loop as you say) rather than useAnimatedProps but I guess this could be react-native-linear-gradient side rather than reanimated.

Ok will just do some more figuring out, thanks.

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