Use Case :

import { BackHandler } from 'react-native'

componentDidMount() {
    BackHandler.addEventListener('hardwareBackPress', this.handleBackPress);
  }

  componentWillUnmount() {
    BackHandler.removeEventListener('hardwareBackPress', this.handleBackPress);
  }

  handleBackPress = () => {
    this.goBack(); // works best when the goBack is async
    return true;
  }