JAVASCRIPT

react native vector icon

import Icon from 'react-native-vector-icons/FontAwesome';
const myIcon = <Icon name="rocket" size={30} color="#900" />;

icon shwoing a box react native vector icons

In 'android/app/build.gradle' (not in android/build.gradle),

apply from: "../../node_modules/react-native-vector-icons/fonts.gradle"

Then,
react-native link react-native-vector-icons 
react-native run-android
react-native start

react native vector icons link

react-native link react-native-vector-icons