Firebase cloud messaging is a free real-time notification service that sends client app notifications. It can consistently send notifications with payloads up to 4Kb. Through FCM supports sending notifications via an app server, the Firebase admin SDK is used in this case.
Just like cloud messaging you can learn the information about other tech features with techwhoop that you never knew existed. This page includes a sample app that can demonstrate to you the way to use this service.
Step 1: Include Firebase in The Project
Please see Adding Firebase to Android App for instructions on incorporating Firebase into your project. The following is a rundown on how to add FCM to the app.
To access Cloud Messaging, go to Tools -> Firebase -> Cloud Messaging -> Create a Firebase Cloud Messaging account. Connect your app to Firebase using the following steps: Complete the three stages in the Firebase project creation process.
Step 2: Gather All of The Necessary Drawable Resources
As a drawable resource, the following icon has been utilized. Toss all the drawable resources into a folder called drawable resources.
Step 3: Edit The Activity main.xml File
The app’s home screen currently only contains a Text View, but it can be customized to meet specific needs.
Step 4: Develop The Notification Layout
To design the layout for the Notification, create a new notification.xml file. This step is optional because you can set the content and Title directly without changing the Notification’s appearance; however, the notice in this example has the following layout. The following is the Notification content: An Image View is a container for images—a Text View for the Message and a Text View for the Title.
Step 5: Create The Message-Receiving Class
Make a class called FirebaseMessageReceiver.java. This class extends the Firebase Messaging Service. To recognize the Firebase Messaging Service as a service in the app, add the following code to the AndroidManifest.xml file between the /activity> and /application> tags.
While the client app is running in the background, this service must handle messages beyond receiving notifications. You can also use it to get notifications from foreground apps, among other things. The AndroidManifest.xml file in its entirety is provided below.
Step 6: Working With The FirebaseMessageReceiver.java Class
Firebase Message Receiver. The on Message Received () method of the java class is overridden to handle two events:
If the Notification has a data payload, the app server sends it if the Notification is sent via the Firebase Admin SDK and has any notification payload.
Remote Message is passed as a parameter to this method. Remote Message is an Object Class extension that implements the Parcel able interface. It’s nothing more than the Message’s object transmitted through FCM. After that, the above function runs a user-defined method called show Notification (), which has two parameters. The code itself contains comments that provide a full explanation. Notifications in Android versions higher than Oreo require a notification channel.
Step 7: Finish The MainActivity.java Program
Because the activity main.xml file does not include much information, the Main Activity file does not require any more code.
Step 8: Use FCM to Send The Notification
1) Select the relevant project from the Firebase console.
2) Cloud Messaging is a good option.
3) Choose First, and send a message. The window below appears. Fill in the blanks. The text field is required, while the rest is optional. You can even add an image via a link or by uploading it; however, adding an image incurs additional storage fees.
4) Choose the app domain in the target area.
5) You can either send the Notification right away or schedule it for a later date.
6) The remaining fields are optional and can be left blank. After that, select Review and then Publish.
