import {RadioGroup, RadioButton} from 'react-native-flexi-radio-button'

onSelect(index, value){
  this.setState({
    text: `Selected index: ${index} , value: ${value}`
  })
}

render(){
  return(
    <View style={styles.container}>
    
      <RadioGroup
        onSelect = {(index, value) => this.onSelect(index, value)}
      >
        <RadioButton value={'item1'} >
          <Text>This is item #1</Text>
        </RadioButton>

        <RadioButton value={'item2'}>
          <Text>This is item #2</Text>
        </RadioButton>

        <RadioButton value={'item3'}>
          <Text>This is item #3</Text>
        </RadioButton>
      </RadioGroup>
      
      <Text style={styles.text}>{this.state.text}</Text>
      
    </View>
  )
}

<RadioGroup
  size={24}
  thickness={2}
  color='#9575b2'
  highlightColor='#ccc8b9'
  selectedIndex={1}
  onSelect = {(index, value) => this.onSelect(index, value)}
>
  <RadioButton 
    style={{alignItems:'center'}}
    value='Yo!! I am a cat.' 
  >
    <Image
      style={{width:100, height: 100}}
      source={{uri:'https://cloud.githubusercontent.com/assets/21040043/18446298/fa576974-794b-11e6-8430-b31b30846084.jpg'}}
    />
  </RadioButton>

  <RadioButton 
    value='index1'
  > 
    <Text>Start from item index #1</Text>
  </RadioButton>

  <RadioButton 
    value='red color'
    color='red'
  >
    <Text>Red Dot</Text>
  </RadioButton>

  <RadioButton 
    value='green color'
    color='green'
  >
    <Text>Green Dot</Text>
  </RadioButton>

  <RadioButton 
    value='blue color'
    color='blue'
  >
    <Text>Blue Dot</Text>
  </RadioButton>
</RadioGroup>