React Native - Device back button handling

Question

I want to check if there are more than one screens are on stack when device back button is hit. If yes, I want to show previous screen and if no, I want to exit app.

Answer 1

In react hooks

import { BackHandler } from 'react-native';

function handleBackButtonClick() {
    navigation.goBack();
    return true;
  }

  useEffect(() => {
    BackHandler.addEventListener('hardwareBackPress', handleBackButtonClick);
    return () => {
      BackHandler.removeEventListener('hardwareBackPress', handleBackButtonClick);
    };
  }, []);