Prompt Title: React Native Badge Icon

To display the number of notifications in a badge icon in React Native Expo, you can use the Notifications.setBadgeNumberAsync method from the expo-notifications library. Here's an example implementation:

javascriptCopy code
import React, { useEffect } from 'react';
import { Text, View } from 'react-native';
import { Notifications } from 'expo-notifications';

export default function App() {
  useEffect(() => {
    registerForPushNotificationsAsync();
    Notifications.setBadgeNumberAsync(0); // set the badge count to 0 when the app is launched
    const subscription = Notifications.addNotificationReceivedListener(handleNotification);
    return () => subscription.remove();
  }, []);

  const registerForPushNotificationsAsync = async () => {
    const { status } = await Notifications.requestPermissionsAsync();
    if (status !== 'granted') {
      alert('Failed to get push token for push notification!');
      return;
    }
    const token = (await Notifications.getExpoPushTokenAsync()).data;
    console.log('Expo push token:', token);
  };

  const handleNotification = (notification) => {
    const { data: { badge } } = notification.request.content; // extract the badge count from the notification data
    Notifications.setBadgeNumberAsync(badge); // set the badge count to the notification badge count
  };

  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <Text>My App</Text>
    </View>
  );
}

In the above example, we set the badge count to 0 when the app is launched using Notifications.setBadgeNumberAsync(0). When a notification is received, we extract the badge count from the notification data and set the badge count using Notifications.setBadgeNumberAsync(badge).

Note that you'll need to ensure that the badge field is included in the notification data when sending push notifications from your server.