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Firebase Cloud Messaging (FCM) offers a broad range of messaging options
and capabilities. The information in this page is intended to
help you understand the different types of FCM messages and what you
can do with them.

Message types

With FCM, you can send two types of messages to clients:

  • Notification messages, sometimes thought of as “display messages.” These are handled by the FCM SDK automatically.
  • Data messages, which are handled by the client app.

Notification messages contain a predefined set of user-visible keys.
Data messages, by contrast, contain only your user-defined custom key-value
pairs. Notification messages can contain an optional
data payload. Maximum payload for both message types is 4000 bytes, except when
sending messages from the Firebase console, which enforces a 1024 character

Use scenario
How to send

Notification message
FCM automatically displays the message to end-user devices
on behalf of the client app. Notification messages have a predefined set
of user-visible keys and an optional data payload of custom key-value

  1. In a trusted environment such as Cloud Functions
    or your app server, use the
    Admin SDK or the

    FCM Server Protocols
    : Set the
    notification key. May have optional data payload.
    Always collapsible.

    See some

    examples of display notifications
    and send request payloads.

  2. Use the

    Notifications composer
    : Enter the Message Text, Title, etc., and send.
    Add optional data payload by providing Custom data.

Data message
Client app is responsible for processing data messages. Data messages
have only custom key-value pairs with no reserved key names (see below).

In a trusted environment such as
Cloud Functions

or your app server, use the
Admin SDK or the

FCM Server Protocols
: Set the data key only.

Use notification messages when you want FCM to handle displaying
a notification on your client
app’s behalf. Use data messages when you want to process the messages on your
client app.

FCM can send a notification message including an optional data
payload. In such cases, FCM handles displaying the notification
payload, and the client app handles the data payload.

Notification messages

For testing or for marketing and user re-engagement, you can send
notification messages using the Firebase console
The Firebase console provides analytics-based
A/B testing to help you refine and
improve marketing messages.

To programmatically send notification messages using the Admin SDK or the
FCM protocols, set the notification key with the
necessary predefined set of key-value options for the user-visible
part of the notification message. For example, here is a JSON-formatted
notification message in an IM app. The user can expect to see a
message with the title “Portugal vs. Denmark” and the text
“great match!” on the device:

      "title":"Portugal vs. Denmark",
      "body":"great match!"

Notification messages are delivered to the notification tray when the app
is in the background. For apps in the foreground, messages are handled by
a callback function.

See the reference documentation
for the full list of predefined keys available for building notification

Data messages

Set the appropriate key with your custom key-value pairs to
send a data payload to the client app.

Make sure that you do not use any reserved words in
your custom key-value pairs. Reserved words include “from”, “notification,”
“message_type”, or any word starting with “google” or “gcm.”

For example, here is a
JSON-formatted message in the same IM app as above,
where the information is encapsulated in the common data key and
the client app is expected to interpret the content:

      "Nick" : "Mario",
      "body" : "great match!",
      "Room" : "PortugalVSDenmark"

The above example shows usage of the top-level, or common data field,
which is interpreted by clients on all platforms that receive the message.
On each platform, the client app receives the data payload
in a callback function.

Encryption for data messages

The Android Transport Layer
(see FCM architecture)
uses point-to-point encryption. Depending on your
needs, you may decide to add end-to-end encryption to data messages.
FCM does not provide an end-to-end solution.
However, there are external solutions available such
as Capillary or

Notification messages with optional data payload

Both programmatically or via the Firebase console, you can send notification
messages that contain an optional payload of custom key-value pairs. In
Notifications composer
, use the Custom data fields in
Advanced options.

App behavior when receiving messages that include both notification and data
payloads depends on whether the app is in the background or the
foreground—essentially, whether or not it is active at the time of

  • When in the
    , apps receive the notification payload in the
    notification tray, and only handle the data payload when the user
    taps on the notification.
  • When in the foreground, your app receives a message
    object with both payloads available.

Here is a JSON-formatted message containing both the
notification key and the data key:

      "title":"Portugal vs. Denmark",
      "body":"great match!"
    "data" : {
      "Nick" : "Mario",
      "Room" : "PortugalVSDenmark"

Customizing a message across platforms

The Firebase Admin SDK and the FCM v1 HTTP protocol both allow your message
requests to set all fields available in the
object. This includes:

  • a common set of fields to be interpreted by all app instances that
    receive the message.
  • platform-specific sets of fields, such as AndroidConfig and WebpushConfig,
    interpreted only by app instances running on the specified platform.

Platform-specific blocks give you flexibility to customize messages for
different platforms to ensure that they are handled correctly when received. The
FCM backend will take all specified parameters into account and customize the
message for each platform.

When to use common fields

Use common fields when you’re:

  • Targeting app instances on all platforms — Apple, Android, and web
  • Sending messages to topics

All app instances, regardless of platform, can interpret the following common

When to use platform-specific fields

Use platform-specific fields when you want to:

  • Send fields only to particular platforms
  • Send platform-specific fields in addition to the common fields

Whenever you want to send values only to particular platforms, don’t use
common fields; use platform-specific fields. For example, to send a notification
only to Apple platforms and web but not to Android, you must use two separate sets of
fields, one for Apple and one for web.

When you are sending messages with specific
delivery options,
use platform-specific fields to set them.
You can specify different values per platform if
you want. However, even when you want to set essentially the same value across
platforms, you must use platform-specific fields. This is because each platform
may interpret the value slightly differently—for example, time-to-live is
set on Android as an expiration time in seconds, while on Apple it is set as an
expiration date.

Example: notification message with platform-specific delivery options

The following v1 send request sends a common notification title and
content to all platforms, but also sends some platform-specific overrides.
Specifically, the request:

  • sets a long time-to-live for Android and Web platforms, while setting the APNs (Apple platforms) message priority to a low setting
  • sets the appropriate keys to define the result of a user tap on the notification on Android and Apple — click_action, and category, respectively.
       "title":"Match update",
       "body":"Arsenal goal in added time, score is now 3-0"
     "apns": {
       "headers": {
         "apns-priority": "5",
       "payload": {
         "aps": {
           "category": "NEW_MESSAGE_CATEGORY"

See the HTTP v1 reference documentation
for complete detail on the keys available in
platform-specific blocks in the message body. For more information about
building send requests that contain the message body, see
Build Send Requests.

Delivery options

FCM provides a specific set of delivery options for messages sent to
Android devices, and allows for similar options on
Apple platforms and web. For example, “collapsible” message behavior is supported on
Android via FCM’s collapse_key, on Apple via
apns-collapse-id, and on JavaScript/Web via Topic. For details, see
descriptions in this section and related reference documentation.

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Non-collapsible and collapsible messages

A message denotes that each individual message is
delivered to the device. A non-collapsible message delivers some useful
content, as opposed to a collapsible message like a content-free “ping” to
the mobile app to contact the server to fetch data.

FCM does not guarantee the order of delivery.

Some typical use cases of non-collapsible messages are chat messages or
critical messages.
For example, in an IM app, you would want to deliver every message, because
every message has different content.

For Android there is a limit of 100 messages that can be stored without
collapsing. If the
limit is reached, all stored messages are discarded. When the device is back
online, it receives a special message indicating that the limit was reached.
The app can then handle the situation properly, typically by requesting a full
sync from the app server.

A is a message that may be replaced by a
new message if it has yet to be delivered to the device.

A common use cases of collapsible messages are messages used to tell
a mobile app to sync data from the server. An
example would be a sports app that updates users with the latest score.
Only the most recent message is relevant.

To mark a message as collapsible on Android, include the
collapse_key parameter in
the message payload. By default, the collapse key is the app package name
registered in the Firebase console. The FCM server can
simultaneously store four different collapsible messages per
device, each with a different collapse key. If you exceed this number,
FCM only keeps
four collapse keys, with no guarantees about which ones are kept.

Topic messages with no payload are collapsible by default. Notification messages
are always collapsible and will ignore the collapse_key parameter.

Which should I use?

Collapsible messages are a better choice from a performance standpoint,
provided your app doesn’t need to use non-collapsible messages. However,
if you use collapsible messages, remember that
FCM only allows a maximum of four different collapse keys to be used
by FCM per
registration token at any given time. You must not exceed this number, or it
could cause unpredictable consequences.

Use scenario
How to send

Every message is important to the client app and needs to be
Except for notification messages, all messages are non-collapsible by

When there is a newer message that renders an older, related message
irrelevant to the client app, FCM replaces the older message.
For example:
messages used to initiate a data sync from the server, or outdated
notification messages.
Set the appropriate parameter in your message request:

  • collapseKey on Android
  • apns-collapse-id on Apple
  • Topic on Web
  • collapse_key in legacy protocols
    (all platforms)

Setting the priority of a message

You have two options for assigning delivery priority to downstream messages
on Android:
normal and high priority. Delivery of normal and high priority messages works
like this:

  • Normal priority. This is the default priority for
    data messages.
    Normal priority messages are delivered immediately when the app is in the
    foreground. When the device is in Doze, delivery may be
    delayed to conserve battery. For less time-sensitive messages, such as
    notifications of new email, keeping your UI in sync, or syncing app data in
    the background, choose normal delivery priority.

    When receiving a normal priority
    message on Android that requests a background data sync for your app, you
    can schedule a task with

    to handle it when the network is available.

  • High priority. FCM attempts to deliver high priority
    messages immediately, allowing FCM to wake a sleeping device when
    necessary and to run some limited processing (including very limited network
    access). High priority messages generally should result in user interaction
    with your app or its notifications. If FCM detects a pattern in which they
    don’t, your messages may be de-prioritized. Android P introduced
    app standby buckets
    which limit the number of FCM high priority messages you can send to your app
    that don’t result in the user using your app or viewing a notification. If, in
    response to a high priority message, a notification is displayed in a way that
    is visible to the user, then your app standby bucket quota will not be consumed
    by that message.

    When sending data messages to Apple devices, the priority
    must be set to 5, or normal priority. Messages sent with high priority are
    rejected by the FCM backend with the error

    Because a small portion of the Android mobile population are
    on high latency networks, avoid opening a connection to your servers before
    displaying a notification. Calling back to the server before the end of the
    allowed processing time may be risky for users on high latency networks.
    Instead, include the
    notification content in the FCM message and display it immediately. If you need
    to sync for additional in-app content on Android, you can schedule a task with

    to handle that in the background.

Here is an example of a normal priority message sent via the FCM
HTTP v1 protocol to notify a magazine
subscriber that new content is available to download:

      "body" : "This week's edition is now available.",
      "title" : "NewsMagazine.com",
    "data" : {
      "volume" : "3.21.15",
      "contents" : "http://www.news-magazine.com/world-week/21659772"
    "webpush": {
      "headers": {
        "Urgency": "high"

For more platform-specific detail on setting message priority:

Setting the lifespan of a message

FCM usually delivers messages immediately after they are sent.
However, this might not always be possible. For example, if the platform is
Android, the device could be turned off, offline, or otherwise unavailable.
Or FCM might intentionally delay messages
to prevent an app from consuming excessive resources and negatively
affecting battery life.

When this happens, FCM stores the message and delivers it as soon
as it’s feasible. While this is fine in most cases, there are some apps for
which a late message might as well never be delivered. For example, if the
message is an incoming call or video chat notification, it is meaningful only
for a short period of time before the call is terminated. Or if the message is
an invitation to an event, it is useless if received after the event has ended.

On Android and Web/JavaScript, you can specify the maximum lifespan of a
message. The value must be a duration from 0 to 2,419,200 seconds (28
days), and it corresponds to the maximum period of time for which FCM
stores and attempts to deliver the message. Requests that don’t contain this
field default to the maximum period of four weeks.

Here are some possible uses for this feature:

  • Video chat incoming calls
  • Expiring invitation events
  • Calendar events

Another advantage of specifying the lifespan of a message is that
FCM never throttles messages with a time-to-live value of 0 seconds.
In other words, FCM guarantees best effort for messages that must be
delivered “now or never.” Keep in mind that a
time_to_live value of
0 means messages that can’t be delivered immediately are discarded. However,
because such messages are never stored, this provides the best latency for
sending notification messages.

Here is an example of a request that includes TTL:

      "Nick" : "Mario",
      "body" : "great match!",
      "Room" : "PortugalVSDenmark"

Receiving messages from multiple senders

FCM allows multiple parties to send messages to the same client
app. For example, suppose the client app is an article aggregator with
multiple contributors, and
each of them should be able to send a message when they publish a new article.
This message might contain a URL so that the client app can download the article.
Instead of having to centralize all sending activity in one location, FCM gives
you the ability to let each of these contributors send its own messages.

To enable this feature, make sure you have each sender’s
sender ID. When
requesting registration, the client app fetches the token multiple
times, each time with a different sender ID in audience field, using
the token retrieval method for the given platform:

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Make sure that you do not add multiple sender IDs to a single token request,
as this can have unpredictable results. Make each call separately, once per
sender ID.

Finally, share the registration token with the corresponding senders, and
they’ll be able to send messages to the client app using their own
authentication keys.

Note that there is limit of 100 multiple senders.

Lifetime of a message

When an app server posts a message to FCM and receives a message
ID back, it does not mean that the message was already delivered to the
device. Rather, it means that it was accepted for delivery. What happens to
the message after it is accepted depends on many factors.

In the best-case scenario, if the device is connected to FCM,
the screen is on and there are no throttling restrictions, the message is
delivered right away.

If the device is connected but in Doze, a low priority message is stored
by FCM until the device is out of Doze. And
that’s where the collapse_key flag plays a role: if there is
already a message with the same collapse key (and registration token) stored
and waiting for
delivery, the old message is discarded and the new message takes its place
(that is, the old message is collapsed by the new one). However, if the collapse
key is not set, both the new and old messages are stored for future delivery.

If the device is not connected to FCM, the message is stored until
a connection is established (again respecting the collapse key rules). When a
connection is established, FCM delivers all pending messages to the
device. If the device never gets connected again
(for instance, if it was factory reset), the message eventually times out and
is discarded from FCM storage. The default timeout is four weeks,
unless the time_to_live flag is set.

To get more insight into the delivery of a message:

    To get more insight into the delivery of messages on Android or Apple platforms, see
    FCM reporting dashboard
    , which records the
    number of messages sent and opened on Apple and Android devices, along with
    data for “impressions” (notifications seen by users) for Android apps.

For Android devices with direct channel messaging enabled, if the
device has not connected to FCM for more than one month,
FCM still accepts the message but immediately discards it. If the
device connects within four weeks of the last data message you sent to it,
your client receives the onDeletedMessages() callback.
The app can then handle the situation properly, typically by requesting a full
sync from the app server.

Finally, when FCM attempts to deliver a message to the device and
the app was uninstalled, FCM discards that message right away and
invalidates the registration token. Future attempts to send a message to that
device results in a NotRegistered error.

Throttling and scaling

Our goal is to always deliver every message sent via FCM. However,
delivering every message sometimes results in a poor overall user experience.
In other cases, we need to provide boundaries to ensure that FCM provides a
scalable service for all senders.


The limits discussed in this section are subject to change.

Collapsible message throttling

As described above, collapsible messages are content-free notifications designed
to collapse on top of each other. In the event that a developer is repeating the
same message to an app too frequently, we delay (throttle) messages to reduce
the impact on a user’s battery.

For example, if you send large numbers of new email sync requests to a single
device, we might delay the next email sync request a few minutes so that the
device can sync at a lower average rate. This throttling is done strictly to
limit the battery impact experienced by the user.

If your use case requires high burst send patterns, then non-collapsible messages may
be the right choice. For such messages, make sure to include the content in
such messages in order to reduce the battery cost.

We limit collapsible messages to a burst of 20 messages per app per device, with
a refill of 1 message every 3 minutes.

XMPP server throttling

We limit the rate that you can connect to FCM XMPP servers to 400 connections
per minute per project. This shouldn’t be an issue for message delivery, but it
is important for ensuring the stability of our system.

For each project, FCM allows 2500 connections in parallel.

Maximum message rate to a single device

You can send up to 240 messages/minute and 5,000 messages/hour to a single
device. This high threshold is meant to allow for short term bursts of traffic,
such as when users are interacting rapidly over chat. This limit prevents errors
in sending logic from inadvertently draining the battery on a device.


Do not routinely send messages near this maximum rate. This
could waste end users’ resources, and your app may be marked as abusive.

Upstream message limit

We limit upstream messages at 1,500,000/minute per project to avoid overloading
upstream destination servers.

We limit upstream messages per device at 1,000/minute to protect against battery
drain from bad app behavior.

Topic message limit

The topic subscription add/remove rate is limited to 3,000 QPS per project.

For message sending rates, see Fanout Throttling.

Fanout throttling

Message fanout is the process of sending a message to multiple devices, such as
when you target topics and groups, or when you use the
Notifications composer
to target audiences or user segments.

Message fanout is not instantaneous and so occasionally you have multiple
fanouts in progress concurrently. We limit the number of concurrent message
fanouts per project to 1,000. After that, we may reject additional fanout
requests or defer the fanout of the requests until some of the already in
progress fanouts complete.

The actual achievable fanout rate is influenced by the number of projects
requesting fanouts at the same time. A fanout rate of 10,000 QPS for an
individual project is not uncommon, but that number is not a guarantee and is a
result of the total load on the system. It is important to note that the
available fanout capacity is divided among projects and not across fanout
requests. So, if your project has two fanouts in progress, then each fanout will
only see half of the available fanout rate. The recommended way to maximize your
fanout speed is to only have one active fanout in progress at a time.

FCM ports and your firewall

If your organization has a firewall to restrict traffic to or
from the Internet, you need to configure it to allow mobile devices to connect
with FCM in order for devices on your network to receive messages.
FCM typically uses port 5228, but it sometimes uses 443, 5229, and

For devices connecting on your network, FCM doesn’t provide
specific IPs because our IP range changes too frequently and your firewall rules
could get out of date, impacting your users’ experience. Ideally, allowlist
ports 5228-5230 & 443 with no IP restrictions. However, if you must have an IP
restriction, you should allowlist all of the IP addresses listed in goog.json.
This large list is updated regularly, and you are recommended to update your
rules on a monthly basis. Problems caused by
firewall IP restrictions are often intermittent and difficult to diagnose.

We do offer a set of domain names that can be allowlisted instead of IP
addresses. Those hostnames are listed below. If we start using additional
hostnames, we will update the list here. Using domain names for your firewall
rule may or may not be functional in your firewall

Ports to open:

  • 5228
  • 5229
  • 5230
  • 443
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Hostnames to open:

  • mtalk.google.com
  • mtalk4.google.com
  • mtalk-staging.google.com
  • mtalk-dev.google.com
  • alt1-mtalk.google.com
  • alt2-mtalk.google.com
  • alt3-mtalk.google.com
  • alt4-mtalk.google.com
  • alt5-mtalk.google.com
  • alt6-mtalk.google.com
  • alt7-mtalk.google.com
  • alt8-mtalk.google.com
  • android.apis.google.com
  • device-provisioning.googleapis.com

Network Address Translation and/or Stateful Packet Inspection firewalls:

If your network implements Network Address Translation (NAT) or Stateful Packet
Inspection (SPI), implement a 30 minute or larger timeout
for our connections over ports 5228-5230. This enables us to provide reliable
connectivity while reducing the battery consumption of your users’ mobile


If you are receiving notifications over APNs, make sure you have also opened the ports specified by Apple


Depending on which FCM features you implement, you may need the
following credentials from your Firebase project:

Project ID
A unique identifier for your Firebase project, used in requests to the
FCM v1 HTTP endpoint. This value is
available in the
Firebase console Settings

Registration token

A unique token string that identifies each client app instance.
The registration token is required for single device and device
group messaging. Note that
registration tokens must be kept secret.

Sender ID
A unique numerical value created when you create your Firebase project,
available in the
Cloud Messaging
tab of the Firebase console
Settings pane. The sender ID is used to identify each
sender that can send messages to the client app.

Access token
A short-lived OAuth 2.0 token that authorizes requests to the HTTP v1
API. This token is associated with a service account that belongs to
your Firebase project. To create and rotate access tokens, follow the
steps described in
Authorize Send Requests

Server key (for legacy protocols)

A server key that authorizes your app server for
access to Google services, including sending messages via the
Firebase Cloud Messaging
legacy protocols. You obtain the server key when you create your Firebase
project. You can view it in the

Cloud Messaging
tab of the Firebase console Settings

Important: Do not include the server key anywhere in
your client code. Also, make sure to use only server keys to authorize your
app server. Android, Apple platform, and browser keys are rejected by FCM.

Xem thêm những bài viết liên quan đến chủ đề firebase push notification


  • Tác giả: JAS ACADAMY
  • Ngày đăng: 2022-01-11
  • Đánh giá: 4 ⭐ ( 6614 lượt đánh giá )
  • Khớp với kết quả tìm kiếm: Relevant push notifications are a great way to boost a user’s engagement towards an application. According to some analysis, push notifications increase app engagement by 88%. It’s also curious to see that the click-through rate for push notifications in Android (4.06%) is much higher than in iOS (1.7%).

    In this tutorial, you are going to learn how to implement push notifications as an app feature using React Native and Firebase. We will be testing out the notification feature on an Android device, but you can go ahead and try it out on iOS yourself.

    There are two main ways you can send push notifications to your app users: local and remote. Local notifications are sent from a React Native application, while remote push notifications are sent from the server or a push notification service such as Firebase Cloud Messaging service (FCM). We will explore both approaches.

    Create React Native app
    npx react-native init Project-name

    React Native Firebase

    React Native Firebase is the officially recommended collection of packages that brings React Native support for all Firebase services on both Android and iOS apps.

    Install the React Native Firebase “app” module to the root of your React Native project with NPM or Yarn:

    Using npm
    npm install –save @react-native-firebase/app
    Using Yarn
    yarn add @react-native-firebase/app


    Generating Android credentials

    On the Firebase console, add a new Android application and enter your projects details. The “Android package name” must match your local projects package name which can be found inside of the manifest tag within the /android/app/src/main/AndroidManifest.xml file within your project.


    Notifee is a local notifications library and does not integrate with any 3rd party messaging services. This provides developers greater flexibility on how notifications are managed and integrated with new and existing applications.

    The library is a successor to the notifications module in React Native Firebase v5. The entire library has been reworked from the ground up focusing on new features, testing, documentation and device compatibility.


    Send Notification to React Native App using Firebase Cloud Messaging

    Firebase Cloud Messaging is a cross-platform cloud solution for messages and notifications for Android, iOS, and web applications, which is available for free. Using Firebase Cloud Messaging(FCM), we can easily notify a client app about new updates or can send offers or exiting messages to keep them engaged. FCM is the best way to drive user re-engagement and retention. We can also use FCM for the instant messaging(Chat app) as a message can transfer a payload of up to 4KB to a client app.

    Test FCM Notification with POSTMAN

    You have to copy Legacy Server Key from Firebase Console
    Note: Firebase has upgraded our server keys to a new version. You may continue to use your Legacy server key, but it is recommended that you upgrade to the newest version.


    Notifee build issue

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Android – Push Notification

  • Tác giả: www.tutorialspoint.com
  • Đánh giá: 5 ⭐ ( 2296 lượt đánh giá )
  • Khớp với kết quả tìm kiếm: Android – Push Notification, A notification is a message you can display to the user outside of your application’s normal UI. You can create your own notifications in android very easily.

React Native Firebase

  • Tác giả: rnfirebase.io
  • Đánh giá: 4 ⭐ ( 7829 lượt đánh giá )
  • Khớp với kết quả tìm kiếm: Installation and getting started with Cloud Messaging.

How to Push Notification in Android using Firebase Cloud Messaging?

  • Tác giả: www.geeksforgeeks.org
  • Đánh giá: 4 ⭐ ( 2290 lượt đánh giá )
  • Khớp với kết quả tìm kiếm: A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions.

FCM Push Notification Plugin for Firebase Cloud Messaging

  • Tác giả: ionicframework.com
  • Đánh giá: 5 ⭐ ( 4926 lượt đánh giá )
  • Khớp với kết quả tìm kiếm: The FCM push notification plugin provides basic functionality for Firebase Cloud Messaging. Read and learn more about the Cordova FCM Plugin for Ionic Apps.

How to Add Push Notifications to a Flutter App using Firebase Cloud Messaging

  • Tác giả: www.freecodecamp.org
  • Đánh giá: 3 ⭐ ( 8733 lượt đánh giá )
  • Khớp với kết quả tìm kiếm: Flutter has quickly become one the most popular frameworks for cross-platform mobile application development. It helps developers build native UIs with support for different device sizes, pixel densities, and orientations creating a beautiful pixel-perfect UI/UX. In this tutorial, we are going to learn how to add push notifications to

Push Notifications with Firebase Cloud Messaging

  • Tác giả: www.pluralsight.com
  • Đánh giá: 3 ⭐ ( 5760 lượt đánh giá )
  • Khớp với kết quả tìm kiếm: Learn how to leverage Firebase Cloud Messaging in setting up push notifications in your Android project. Take your Android skills to the next level with this free tutorial!

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