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

try this react navigation

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


    handleBackButton = () => {

        const pushAction = StackActions.push({
            routeName: 'DefaultSelections',
        });

        this.props.navigation.dispatch(pushAction);
    }

current screen is "DefaultSelections" , on back button press, would be shifted on to the same and hence back button disabled work around, as disabling back button by

return true

for backButton ( as suggested by the official docs ) disables back button on all screens ; not wanted