Retrieving data from notifications without having to interact with them (using Firebase Cloud Messaging and React Native)

Currently, I am able to handle messages whether the app is open, minimized, or closed. However, how can I process a message if a user logs into the application without receiving a notification?

 useEffect(() => {
    messaging().setBackgroundMessageHandler(async remoteMessage => {
        handlerMessage(remoteMessage)
        setInitialRoute('Messenger')
    });
    messaging().onMessage(async remoteMessage => {
        handlerMessage(remoteMessage);
    });

    messaging()
        .getInitialNotification()
        .then(remoteMessage => {
            if (remoteMessage) {
                handlerMessage(remoteMessage);
                setInitialRoute('Messenger')
            }
        });
}, []);
javascripttypescriptfirebasereact-nativefirebase-cloud-messaging

Answer №1

Initially, ensure that your "setBackgroundMessageHandler" function is placed in your index.js file as per the instructions on the react-native-firebase documentation. It's essential to review this. Regarding your query: You are looking to handle data from a fcmNotification while your app is in the background or closed state. Remember, the setBackgroundMessageHandler is restricted from making UI updates (such as altering state, mentioned in the documentation). Instead, it can carry out network operations or update localStorage. Make sure to implement this correctly. Upon receiving a message through the backgroundHandler, update your LocalStorage. Later, upon reopening your app, check if the LocalStorage holds any data processed by the backgroundHandler. If affirmative, take action and then remove the data to avoid triggering actions with outdated information on the next app launch. In the case of no data present, simply do nothing.

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