vadiraja

<View>
  <Button onPress={() => Auth.signOut({ global: true })}  transparent>
    <Icon type="FontAwesome" name="sign-out" style={{color: 'white'}}/>
  </Button>
</View>

vadiraja

<View style={styles.containFbBg}>
  <Button
    onPress={() => Auth.federatedSignIn({provider: 'Facebook'})}
    iconRight
    style={styles.fbButton}
  >
  <FontAwesome name="facebook" size={28} color="#ffffff" />
  <Text style={styles.fbButtonText}>Sign in with facebook</Text>
  </Button>
</View>

vadiraja

<NavigationContainer>
  <Stack.Navigator 
    headerMode="screen"
    screenOptions={{
      headerTintColor: 'white',
      headerStyle: styles.header,
    }}  
  >
    {this.state.isLoggedIn ? (
      <>

vadiraja

import { Linking } from 'expo';
import * as WebBrowser from 'expo-web-browser';

/**Amplify documentation has this example */
const urlOpenerExpo = async (url, redirectUrl) => {
  console.log(">>>>>>>>> in urlOpener")
  // On Expo, use WebBrowser.openAuthSessionAsync to open the Hosted UI pages.
  const { type, url: newUrl } = await WebBrowser.openAuthSessionAsync(url, redirectUrl);

  console.log("Type")