rn-activityindicator-bugreport's Introduction

RN-ActivityIndicator-BugReport

Sample App for a bug report for React Native

(Update) Workaround

It seems like a bug with zIndex. As janicduplessis suggested, I added collapsable={false} to the parent View and it worked. The fixed implementation is available under index.android.fixed.js.

The problem

I put an ActivityIndicator on screen, which should be removed after some time (i.e. when the data arrives). But the problem is that it still remains on screen even after it is removed (or not outputted) in the render function. In addition, the backgroundColor of the View above disappears, too.

I also found out that doing one of the following fixes the problem, but I don't know why:

Unset the zIndex for the View above (having zIndex here has no reason what so ever, but I needed this in the project I was working on)
Set a backgroundColor for the View element containing this ActivityIndicator.

Inline code:

export default class TestReport extends Component {
    state = {
        showIndicator: true,
    };

    componentDidMount() {
        setTimeout(() => this.setState({showIndicator: false}), 3000);
    }

    render() {
        return (
            <View style={styles.container}>
                <View style={styles.firstHalf}>
                </View>
                <View style={styles.secondHalf}>
                    {this.state.showIndicator
                        ? (<ActivityIndicator size="large"/>)
                        : (<Text>hello</Text>)}
                </View>
            </View>
        );
    }
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
    },
    firstHalf: {
        zIndex: 1,
        flex: 1,
        backgroundColor: "#2f2",
    },
    secondHalf: {
        flex: 1,
    },
});

Here's a screen recording of what happens:

What should happen: the indicator should be removed after 3 seconds and the message hello should appear.
What happens: the indicator remains after the 3 seconds, and the message hello appears. In addition, the backgroundColor of the View above disappears.