Use component state. In your constructor, set the start url:
this.state = { image: { uri: 'http://example.com/my_image.jpg' } }
Create a handler onError:
onError(error){
this.setState({ image: require('your_local_image.path')})
}
Then combine everything together:
<Image style={ styles.userImage }
source={ this.state.image }
onError={ this.onError.bind(this) }
/>
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