handleClick = (link) => {
    Linking.canOpenURL(link).then(supported => {
        if (supported) {
            Linking.openURL(link);
        } else {
            console.log('Don't know how to open URI: ' + link);
        }
    });
};


<View style={styles.AddressRow}>
                            {
                                    item.Online != ''? <TouchableOpacity  onPress={() => Linking.openURL(  item.Online )}>
                                    </TouchableOpacity>: null

                             }


                          <TouchableOpacity  onPress={() => Linking.openURL(item.Online)}>
                                            <Text style={styles.underLineText}>Online</Text>
                         </TouchableOpacity>

[


    {
        "id":"1",
        "fk": 1,
        "addr": "Test Drive",
        "phone": "951-955-6200",
        "LatL":"33.9",
        "Long2":"-117.373423",
        "Online": "http://www.test.com",

        "image" : "png"
     },



     {
        "id":"3",
        "fk": 1,
        "addr": "880 N State St, Hemet 92543-1496",
        "phone": "951-955-6200",
        "LatL":"33.7",
        "Long2":"-116.971169",
        "Online": "",
        "image" : "Home"


     }
]

<View style={styles.AddressRow}>
  {item.Online !== '' && <TouchableOpacity  onPress={() => Linking.openURL(item.Online)}>
    <Text style={styles.underLineText}>Online</Text>
  </TouchableOpacity>}