How to handle notification when app in background in Firebase

Question

Here is my manifest       lt service android name   fcm PshycoFirebaseMessagingServices  gt           lt intent-filter gt               lt action android name  com google firebase MESSAGING EVENT    gt           lt  intent-filter gt       lt  service gt        lt service android name   fcm PshycoFirebaseInstanceIDService  gt           lt intent-filter gt               lt action android name  com google firebase INSTANCE ID EVENT    gt           lt  intent-filter gt       lt  service gt    When the app is in background and notification arrives then the default notification comes and doesn t run my code of onMessageReceived   Here is my onMessageReceived code  This invokes if my app is running on foreground  not when app in background  How to run this code when the app is in background too       START receive message   Override public void onMessageReceived RemoteMessage remoteMessage           TODO developer   Handle FCM messages here         If the application is in the foreground handle both data and notification messages here         Also if you intend on generating your own notifications as a result of a received FCM        message  here is where that should be initiated  See sendNotification method below      data   remoteMessage getData        String title   remoteMessage getNotification   getTitle        String message   remoteMessage getNotification   getBody        String imageUrl    String  data get  image        String action    String  data get  action        Log i TAG   onMessageReceived  title     title       Log i TAG   onMessageReceived  message     message       Log i TAG   onMessageReceived  imageUrl     imageUrl       Log i TAG   onMessageReceived  action     action        if  imageUrl    null            sendNotification title message action         else           new BigPictureNotification this title message imageUrl action               END receive message

User · Answer

According to docs

Handle messages in a backgrounded app

When your app is in the background, Android directs notification messages to the system tray. A user tap on the notification opens the app launcher by default.

This includes messages that contain both notification and data payload. In these cases, the notification is delivered to the device's system tray, and the data payload is delivered in the extras of the intent of your launcher Activity.

If you want to open your app and perform a specific action, set click_action in the notification payload and map it to an intent filter in the Activity you want to launch. For example, set click_action to OPEN_ACTIVITY_1 to trigger an intent filter like the following:

 <intent-filter>   <action android:name="OPEN_ACTIVITY_1" />  
 <category android:name="android.intent.category.DEFAULT" />
 </intent-filter>

Edit :

Based on this thread :

You can't set click_action payload using Firebase Console. You could try testing with a curl command or a custom http server

curl --header "Authorization: key=<YOUR_KEY_GOES_HERE>" 
     --header Content-Type:"application/json" https://fcm.googleapis.com/fcm/send  
     -d "{\"to\":\"/topics/news\",\"notification\": 
         {\"title\": \"Click Action Message\",\"text\": \"Sample message\",
            \"click_action\":\"OPEN_ACTIVITY_1\"}}"

User · Answer

According to OAUTH 2 0    There will be Auth problem for this case beacuse FCM now using OAUTH 2  So I read firebase documentation and according to documentation new way to post data message is   POST  https   fcm googleapis com v1 projects YOUR FIREBASEDB ID messages send   Headers  Key  Content-Type  Value  application json   Auth  Bearer YOUR TOKEN    Example Body        message         topic     xxx        data                body     This is a Firebase Cloud Messaging Topic Message              title     FCM Message                           In the url there is Database Id which you can find it on your firebase console   Go project setttings   And now lets take our token  It will valid only 1 hr    First in the Firebase console  open Settings   Service Accounts  Click Generate New Private Key  securely store the JSON file containing the key  I was need this JSON file to authorize server requests manually  I downloaded it   Then I create a node js project and used this function to get my token   var PROJECT ID    YOUR PROJECT ID   var HOST    fcm googleapis com   var PATH     v1 projects     PROJECT ID     messages send   var MESSAGING SCOPE    https   www googleapis com auth firebase messaging   var SCOPES    MESSAGING SCOPE      router get      function req  res  next          res render  index     title   Express            getAccessToken   then function accessToken            console log  TOKEN    accessToken                     function getAccessToken     return new Promise function resolve  reject        var key   require    YOUR DOWNLOADED JSON FILE json        var jwtClient   new google auth JWT          key client email          null          key private key          SCOPES          null            jwtClient authorize function err  tokens            if  err                reject err               return                    resolve tokens access token                   Now I can use this token in my post request  Then I post my data message  and it is now handled by my apps onMessageReceived function

User · Answer

I figured out the scenarios   When app is in foreground  onMessageReceived   method is called from the FirebaseService So the pendingIntent defined in the service class will be called   And when app is in background  first activity is called   Now  if you use a splash activity  then must keep in mind the splashactivity will be called  else if there is no splashActivity  then whatever the first activity is  will be called   Then you need to check getIntent   of the firstActivity to see if it has any bundle  if everything is alright you will see bundle is there with values filled in  If the value in data tag sent from server looks like this     data          user name    arefin sajib        value    user name notification        Then in the first activity  you will see  there is a valid intent  getIntent   is not null    valid bundle and inside bundle   there will the whole JSON mentioned above with data  as key   For this scenario  code for extraction of value will look like this       if getIntent    null               Bundle bundle   getIntent   getExtras                if  bundle    null                    try                      JSONObject object   new JSONObject bundle getStringExtra  data     String user name   object optString  user name                       catch  JSONException e                        e printStackTrace

User · Answer

Thanks to All of you for your Answers  But I solved this by sending data message instead of sending Notification  Server code   lt  php  url    https   fcm googleapis com fcm send    token    C-l6T a7HouUK        serverKey    AAAAaOcKS00            define   API ACCESS KEY    serverKey     registrationIds   array  token      prep the bundle   msg   array      message     gt   here is a message  message     title           gt   This is a title  title     subtitle    gt   This is a subtitle  subtitle     tickerText      gt   Ticker text here   Ticker text here   Ticker text   here     vibrate     gt  1    sound           gt  1    largeIcon       gt   large icon     smallIcon       gt   small icon        fields   array       registration ids       gt   registrationIds     data               gt   msg      headers   array       Authorization  key     API ACCESS KEY    Content-Type  application json         ch   curl init     curl setopt   ch CURLOPT URL   https   android googleapis com gcm send       curl setopt   ch CURLOPT POST  true     curl setopt   ch CURLOPT HTTPHEADER   headers     curl setopt   ch CURLOPT RETURNTRANSFER  true     curl setopt   ch CURLOPT SSL VERIFYPEER  false     curl setopt   ch CURLOPT POSTFIELDS  json encode   fields        result   curl exec  ch     curl close   ch     echo  result     gt    And caught the Data in onMessageReceived  public class MyFirebaseMessagingService extends FirebaseMessagingService          private static final String TAG    MyFirebaseMsgService     Override public void onMessageReceived RemoteMessage remoteMessage        Log d TAG   From      remoteMessage getFrom             Check if message contains a data payload      if  remoteMessage getData   size    gt  0            Log d TAG   Message data payload      remoteMessage getData            sendNotification remoteMessage getData   get  message                  Check if message contains a notification payload      else if  remoteMessage getNotification      null            Log d TAG   Message Notification Body      remoteMessage getNotification   getBody         sendNotification remoteMessage getNotification   getBody                  private void sendNotification String messageBody        Intent intent   new Intent this  Notify class  putExtra  msg  messageBody       intent addFlags Intent FLAG ACTIVITY CLEAR TOP       PendingIntent pendingIntent   PendingIntent getActivity this  0    Request code     intent              PendingIntent FLAG ONE SHOT        String channelId    idddd       Uri defaultSoundUri  RingtoneManager getDefaultUri RingtoneManager TYPE NOTIFICATION       NotificationCompat Builder notificationBuilder               new NotificationCompat Builder MyFirebaseMessagingService this                       setSmallIcon R mipmap ic launcher                       setContentTitle  FCM Message                        setContentText messageBody                       setAutoCancel true                       setSound defaultSoundUri                       setContentIntent pendingIntent        NotificationManager notificationManager                NotificationManager  getSystemService Context NOTIFICATION SERVICE        notificationManager notify 0    ID of notification     notificationBuilder build

User · Answer

1  Why is this happening   There are two types of messages in FCM  Firebase Cloud Messaging     Display Messages  These messages trigger the onMessageReceived   callback only when your app is in foreground Data Messages  Theses messages trigger the onMessageReceived   callback even if your app is in foreground background killed      NOTE  Firebase team have not developed a UI to send data-messages to   your devices  yet  You should use your server for sending this type       2  How to   To achieve this  you have to perform a POST request to the following URL      POST https   fcm googleapis com fcm send   Headers   Key  Content-Type  Value  application json Key  Authorization  Value  key  lt your-server-key gt    Body using topics         to     topics my topic        data              my custom key    my custom value            my custom key2   true            Or if you want to send it to specific devices         data              my custom key    my custom value            my custom key2   true              registration ids      device-token     device2-token     device3-token             NOTE  Be sure you re not adding JSON key notification   NOTE  To get your server key  you can find it in the firebase console  Your project - gt  settings - gt  Project settings - gt  Cloud messaging - gt  Server Key   3  How to handle the push notification message   This is how you handle the received message    Override public void onMessageReceived RemoteMessage remoteMessage          Map lt String  String gt  data   remoteMessage getData         String myCustomKey   data get  my custom key             Manage data

User · Answer

Using this code you can get the notification in background foreground and also put action     Data should come in this format from the notification      to     xyz Notifications      data            key1    title notification          key2    description notification          In-App use this code      Override     public void onMessageReceived RemoteMessage remoteMessage            super onMessageReceived remoteMessage         String key1Data   remoteMessage getData   get  key1             use key1Data to according to your need

User · Answer

Here is more clear concepts about firebase message  I found it from their support team  Firebase has three message types  Notification messages   Notification message works on background or foreground  When app is in background  Notification messages are delivered to the system tray  If the app is in the foreground  messages are handled by onMessageReceived   or didReceiveRemoteNotification callbacks  These are essentially what is referred to as Display messages  Data messages  On Android platform  data message can work on background and foreground  The data message will be handled by onMessageReceived    A platform specific note here would be  On Android  the data payload can be retrieved in the Intent used to launch your activity  To elaborate  if you have  quot click action quot   quot launch Activity 1 quot   you can retrieve this intent through getIntent   from only Activity 1  Messages with both notification and data payloads  When in the background  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  Secondly  the click action parameter is often used in notification payload and not in data payload  If used inside data payload  this parameter would be treated as custom key-value pair and therefore you would need to implement custom logic for it to work as intended  Also  I recommend you to use onMessageReceived method  see Data message  to extract the data bundle  From your logic  I checked the bundle object and haven t found expected data content  Here is a reference to a similar case which might provide more clarity  For more info visit my this thread

User · Answer

I feel like all the responses are incomplete but all of them have something that you need to process a notification that have data when your app is in background   Follow these steps and you will be able to process your notifications when your app is in background   1 Add an intent-filter like this    lt activity android name   MainActivity  gt         lt intent-filter gt              lt action android name   MainActivity    gt              lt category android name  android intent category DEFAULT    gt         lt  intent-filter gt   lt  activity gt    to an activity that you want to process the notification data    Send notifications with the next format        notification               click action      MainActivity             body     new Symulti update               title     new Symulti update               icon     ic notif symulti        data              to     c9Vaa3ReGdk APA91bH-AuXgg3lDN2WMcBrNhJZoFtYF9       The key here is add    click action      MainActivity    where  MainActivity is the activity with the intent-filter that you added in step 1    Get  data  info from notification in the onCreate of   MainActivity    protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity main         get notification data info     Bundle bundle   getIntent   getExtras        if  bundle    null             bundle must contain all info sent in  data  field of the notification            And that should be all you need to do  I hope this helps somebody

User · Answer

June 2018 Answer -   You have to make sure there is not a  notification  keyword anywhere in the message   Only include  data   and the app will be able to handle the message in onMessageReceived  even if in background or killed   Using Cloud Functions   const message         token  token id       obtain device token id by querying data in firebase     data           title   my custom title          body    my custom body message                   return admin messaging   send message  then response   gt           handle response       Then in your onMessageReceived    in your class extending com google firebase messaging FirebaseMessagingService    if  data    null      Log d TAG   data title is      data get  title      Log d TAG   data body is      data get  body          build notification using the body  title  and whatever else you want

User · Answer

According to the firebase documentation in send downstream using firebase  there is 2 type of payload     data     This parameter specifies the custom key-value pairs of the message s payload    Client app is responsible for processing data messages  Data messages have only custom key-value pairs   notification     This parameter specifies the predefined  user-visible key-value pairs of the notification payload  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     When you are in the foreground you can get the data inside FCM using onMessageReceived    you can get your data from data payload   data   remoteMessage getData    String customData    String  data get  customData      When you are in background  FCM will showing notification in system tray based on the info from notification payload  Title  message  and icon which used for the notification on system tray are get from the notification payload        notification              title     title            body      body text            icon      ic notification            click action     OPEN ACTIVITY 1               This notification payload are used when you want to automactically showing notification on the system tray when your app is in the background  To get notification data when your app in the background  you should add click action inside notification payload      If you want to open your app and perform a specific action  while backgrounded   set click action in the notification payload and map it to an intent filter in the Activity you want to launch  For example  set click action to OPEN ACTIVITY 1 to trigger an intent filter like the following     lt intent-filter gt     lt action android name  OPEN ACTIVITY 1    gt     lt category android name  android intent category DEFAULT    gt   lt  intent-filter gt    Put that intent-filter on your manifest  inside one of your activity tag  When you click the notification  it will open the app and go straight to activity that you define in click action  in this case  OPEN ACTIVTY 1   And inside that activity you can get the data by    Bundle b   getIntent   getExtras    String someData   b getString  someData      I m using FCM for my android app and use both of the payload  Here is the example JSON i m using         to    FCM registration ID      notification          title     title        body      body text        icon      ic notification        click action     OPEN ACTIVITY 1            data           someData      This is some data         someData2     etc

User · Answer

Since the display-messages which are sent from Firebase Notification UI only works if your app is in foreground  For data-messages  there is a need to make a POST call to FCM  Steps   Install Advanced Rest Client Google Chrome Extension   Add the following headers   Key  Content-Type  Value  application json  Key  Authorization  Value  key  your server key   Add the body   If using topics           to      topics topic name        data          key1     value1        key2     value2            If using registration id           registration ids        id    id1          data          key1     value1        key2     value2                  Thats it   Now listen to onMessageReceived callback as usual    Override public void onMessageReceived RemoteMessage remoteMessage          Map lt String  String gt  data   remoteMessage getData         String value1   data get  key1         String value2   data get  key2

User · Answer

To capture the message in background you need to use a BroadcastReceiver  import android content Context import android content Intent import android util Log import androidx legacy content WakefulBroadcastReceiver import com google firebase messaging RemoteMessage  class FirebaseBroadcastReceiver   WakefulBroadcastReceiver          val TAG  String   FirebaseBroadcastReceiver  class java simpleName      override fun onReceive context  Context  intent  Intent             val dataBundle   intent extras         if  dataBundle    null              for  key in dataBundle keySet                      Log d TAG   dataBundle      key           dataBundle get key                         val remoteMessage   RemoteMessage dataBundle                    and add this to your manifest    lt receiver       android name  MY PACKAGE NAME FirebaseBroadcastReceiver        android exported  true        android permission  com google android c2dm permission SEND  gt           lt intent-filter gt               lt action android name  com google android c2dm intent RECEIVE    gt           lt  intent-filter gt   lt  receiver gt

User · Answer

you want to work onMessageReceived RemoteMessage remoteMessage  in background send only data part notification part this     data       image           message    Firebase Push Message Using API         AnotherActivity    True       to     device id Or Device token       By this onMessageRecivied is call background and foreground no need to handle notification using notification tray on your launcher activity   Handle data payload in using this         public void onMessageReceived RemoteMessage remoteMessage      if  remoteMessage getData   size    gt  0       Log d TAG   Message data payload      remoteMessage getData

User · Answer

Remove notification payload completely from your server request  Send only data and handle it in onMessageReceived    otherwise your onMessageReceived will not be triggered when the app is in background or killed   Here is what I am sending from server        data         id   1       missedRequests   5      addAnyDataHere   123         to    fhiT7evmZk8 APA91bFJq7Tkly4BtLRXdYvqHno2vHCRkzpJT8QZy0TlIGs            So you can receive your data in onMessageReceived RemoteMessage message  like this   let s say I have to get the id   Object obj   message getData   get  id            if  obj    null                int id   Integer valueOf obj toString                 And similarly you can get any data which you have sent from server within onMessageReceived

User · Answer

According to the docs   May 17  2017     When your app is in the background  Android   directs notification messages to the system tray  A user tap on the   notification opens the app launcher by default       This includes messages that contain both notification and data payload    and all messages sent from the Notifications console   In these   cases  the notification is delivered to the device s system tray  and   the data payload is delivered in the extras of the intent of your   launcher Activity    So you should use both of the payload notification   data        to    FCM registration ID      notification          title     title        body      body text        icon      ic notification            data           someData      This is some data         someData2     etc           There is no need to use click action You should just get exras from intent on LAUNCHER activity     lt activity android name   MainActivity  gt           lt intent-filter gt               lt category android name  android intent category LAUNCHER    gt           lt  intent-filter gt   lt  activity gt    Java code should be on onCreate method on MainActivity    Intent intent   getIntent    if  intent    null  amp  amp  intent getExtras      null        Bundle extras   intent getExtras        String someData  extras getString  someData        String someData2   extras getString  someData2        You can test  both of the payload notification   data from Firebase Notifications Console   Don t forget to fill custom data fields on Advanced options section

User · Answer

I ve experienced the same problem and recompiled the firebase library and prevented it from sending notifications when the application is in the background   library https   github com erdalceylan com-google-firebase-messaging   dependencies           compile  com google firebase firebase-core 11 2 0          compile  com github erdalceylan com-google-firebase-messaging v1-11 2 0              WorkerThread public void onMessageReceived RemoteMessage var1        your app is in background or foreground all time calling     hope helps  Good luck

User · Answer

In general There are two types of messages in FCM  Firebase Cloud Messaging    Display Messages  These messages trigger the onMessageReceived   callback only when your app is in foreground  Data Messages  Theses messages trigger the onMessageReceived   callback even if your app is in foreground background killed   Data Messages example        quot to quot    quot  path quot       quot data quot                   quot my custom key quot    quot my custom value quot           quot my custom key2 quot   true             Display Messages example           quot notification quot                  quot title quot     quot title quot                quot body quot      quot body text quot                quot icon quot      quot ic notification quot                quot click action quot     quot OPEN ACTIVITY 1 quot                  Android side can handle notifications like  public class MyFirebaseMessagingService extends FirebaseMessagingService                   Override public void onMessageReceived RemoteMessage remoteMessage              Map lt String  String gt  data   remoteMessage getData               String myCustomKey   data get  quot my custom key quot                                    More details about FCM you can find here   Set up a Firebase Cloud Messaging client app on Android

User · Answer

In addition to above answers   If you are testing push notifications using FCM console   data  key and object is not added to Push Notification bundle  So you will not receive detailed push notification when App is background or killed   In this case you have to opt for your back end admin console to test App background scenario   Here  you will have added  data  key to your push bundle  so  detailed push will be shown as expected  Hope this helps few

User · Answer

Override public void onMessageReceived RemoteMessage remoteMessage         is not called every time it is called only when app is in forground  there is one override method this method is called every time   no matter what app is in foreground or in background or killed but this method is available with this firebase api version   this is the version u have to import from gradle  compile  com google firebase firebase-messaging 10 2 1    this is the method   Override public void handleIntent Intent intent        super handleIntent intent           you can get ur data here        intent getExtras   get  your data key          with previous firebase api this method was not there so in that case  fire base handle itself when app is in background      now u have this method  what ever u want to do     u can do it here in this method         if you are using previous version than default activity will start  in that case u can get data same way   if getIntent   getExtras      null  amp  amp  getIntent   getExtras   get  your data key      null    String strNotificaiton   getIntent   getExtras   get  your data key   toString         do what ever u want              generally this is the structure from server we get in notification          notification              body    Cool offers  Get them before expiring             title    Flat 80  discount            icon    appicon            click action    activity name    optional if required                  data              product id   11           product details    details                 other info                       it s up to u how u want to give that data key or u want give notification anything u can give         what ever u will give here with same key u will get that data             there are few cases if u r not sending click action in that case when u will click on notification default activity will open   but if u want to open your specific activity when app is in background u can call your activity from this on handleIntent method because this is called every time

User · Answer

Simple summary like this   if your app is running   onMessageReceived      is triggers    if your app is not running  killed by swiping     onMessageReceived      is not triggered and delivered by direclty  If you have any specialy key-value pair  They don  t work beacuse of onMessageReceived   not working    I  ve found this way   In your launcher activity  put this logic   protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState  R layout activity splash        if  getIntent   getExtras      null  amp  amp  getIntent   getExtras   containsKey  PACKAGE NAME                  do what you want             and this for killing app if we dont want to start         android os Process killProcess android os Process myPid            else              continue to app           in this if block  search for your keys according to firebase UI   In this example my key and value like above   sorry for language        When my code works  i get  com rda note     android os Process killProcess android os Process myPid       with this line of code  i closed my application and open Google Play Market  happy coding

User · Answer

2017 updated answer  Here is a clear-cut answer from the docs regarding this

User · Answer

To make firebase library to call your onMessageReceived   in the following cases  App in foreground App in background App has been killed  you must not put JSON key  notification  in your request to firebase API but instead use  data   see below  The following message will not call your onMessageReceived   when your app is in the background or killed  and you can t customize your notification        quot to quot    quot  topics journal quot       quot notification quot             quot title quot     quot title quot           quot text quot    quot data  quot           quot icon quot    quot ic notification quot           but instead using this will work      quot to quot    quot  topics dev journal quot       quot data quot             quot text quot   quot text quot           quot title quot   quot  quot           quot line1 quot   quot Journal quot           quot line2 quot   quot    quot           Basically  the message is sent in the argument RemoteMessage along with your data object as Map lt String  String gt   then you can manage the notification in onMessageReceived as in the snippet here  Override public void onMessageReceived RemoteMessage remoteMessage          Map lt String  String gt  data   remoteMessage getData            you can get your text message here       String text  data get  quot text quot           NotificationCompat Builder notificationBuilder   new NotificationCompat Builder this             optional  this is to make beautiful icon               setLargeIcon BitmapFactory decodeResource                                      getResources    R mipmap ic launcher              setSmallIcon smallIcon     mandatory                     You can read more on notification here      https   developer android com training notify-user build-notification html     https   www youtube com watch v -iog fmm6mE

User · Answer

Since 2019  Google Firebase has a big change in their APIs I mean     com google firebase firebase-messaging 18 0 0   in 18 0 0 they removed MyFirebaseInstanceIDService and you need to get token in MyFirebaseMessagingService so you just need to write     Override public void onNewToken String token        Log d TAG   Refreshed token      token        and also in your AndroidManifest xml  you have to remove     lt service android name   service MyFirebaseInstanceIDService  gt           lt intent-filter gt               lt action android name  com google firebase INSTANCE ID EVENT    gt           lt  intent-filter gt       lt  service gt    Also  you re recommended to set default values to customize the appearance of notifications  You can specify a custom default icon and a custom default color that are applied whenever equivalent values are not set in the notification payload   Add these lines inside the application tag to set the custom default icon and custom color        lt meta-data         android name  com google firebase messaging default notification icon          android resource   drawable ic notification    gt        lt meta-data         android name  com google firebase messaging default notification color          android resource   color colorAccent    gt        lt meta-data         android name  com google firebase messaging default notification channel id          android value   string push channel    gt    now to handle notification messages in a backgrounded app you should define an Intent in your first Activity even if it is SplashScreen  When your app is in the background  Android directs notification messages to the system tray  A user tap on the notification opens the app launcher by default   for example  if your Json is like this     data      message    2    title    1    pushType     banner    bannerLink    http   www google com    image     https   www google com images branding googlelogo 1x googlelogo color 272x92dp png     you just need to write a simple intent to get those values           Bundle extras   intent getExtras            String bannerLink   extras getString  bannerLink                        String channelId   extras getString  channelId

User · Answer

I had same problem  After some digging why my MainActivity is called with intent without data I realized that my LAUNCHER activity  as in Manifest  is SplashActivity  There I found the message data and forwarded them to MainActivity  Works like sharm  I beleive this can help someone  Thanks for all another answers

User · Answer

Working as of July 2019  Android compileSdkVersion 28   buildToolsVersion 28 0 3  and  firebase-messaging 19 0 1  After many many hours of researching through all of the other StackOverflow questions and answers  and trying innumerable outdated solutions  this solution managed to show notifications in these 3 scenarios   - App is in foreground       the notification is received by the onMessageReceived method at my MyFirebaseMessagingService class  - App has been killed  it is not running in background        the notification is sent to the notification tray automatically by FCM  When the user touches the notification the app is launched by calling the activity that has android intent category LAUNCHER in the manifest  You can get the data part of the notification by using getIntent   getExtras   at the onCreate   method   - App is in background       the notification is sent to the notification tray automatically by FCM  When the user touches the notification the app is brought to the foreground by launching the activity that has android intent category LAUNCHER in the manifest  As my app has launchMode  singleTop  in that activity  the onCreate   method is not called because one activity of the same class is already created  instead the onNewIntent   method of that class is called and you get the data part of the notification there by using intent getExtras     Steps  1- If you define your app s main activity like this    lt activity     android name   MainActivity      android label   string app name      android largeHeap  true      android screenOrientation  portrait      android launchMode  singleTop  gt       lt intent-filter gt           lt action android name   MainActivity    gt           lt action android name  android intent action MAIN    gt           lt category android name  android intent category LAUNCHER    gt           lt category android name  android intent category DEFAULT    gt       lt  intent-filter gt   lt  activity gt    2- add these lines at the onCreate   method of your MainActivity class  Intent i   getIntent    Bundle extras   i getExtras    if  extras    null        for  String key   extras keySet              Object value   extras get key           Log d Application APPTAG   Extras received at onCreate   Key      key     Value      value             String title   extras getString  title        String message   extras getString  body        if  message  null  amp  amp  message length   gt 0            getIntent   removeExtra  body            showNotificationInADialog title  message             and these methods to the same MainActivity class    Override public void onNewIntent Intent intent         called when a new intent for this class is created         The main case is when the app was in background  a notification arrives to the tray  and the user touches the notification      super onNewIntent intent        Log d Application APPTAG   onNewIntent - starting        Bundle extras   intent getExtras        if  extras    null            for  String key   extras keySet                  Object value   extras get key               Log d Application APPTAG   Extras received at onNewIntent   Key      key     Value      value                     String title   extras getString  title            String message   extras getString  body            if  message  null  amp  amp  message length   gt 0                getIntent   removeExtra  body                showNotificationInADialog title  message                       private void showNotificationInADialog String title  String message            show a dialog with the provided title and message     AlertDialog Builder builder   new AlertDialog Builder this       builder setTitle title       builder setMessage message       builder setPositiveButton  OK   new DialogInterface OnClickListener             public void onClick DialogInterface dialog  int whichButton                dialog cancel                          AlertDialog alert   builder create        alert show        3- create the class MyFirebase like this   package com yourcompany app   import android content Intent  import android util Log   import com google firebase messaging FirebaseMessagingService  import com google firebase messaging RemoteMessage   public class MyFirebaseMessagingService extends FirebaseMessagingService         public MyFirebaseMessagingService             super                Override     public void onMessageReceived RemoteMessage remoteMessage             Log d Application APPTAG   myFirebaseMessagingService - onMessageReceived - message      remoteMessage            Intent dialogIntent   new Intent this  NotificationActivity class           dialogIntent addFlags Intent FLAG ACTIVITY NEW TASK           dialogIntent putExtra  msg   remoteMessage           startActivity dialogIntent               4- create a new class NotificationActivity class like this   package com yourcompany app   import android app Activity  import android app AlertDialog  import android content DialogInterface  import android os Bundle  import android util Log   import androidx appcompat app AppCompatActivity  import androidx appcompat view ContextThemeWrapper   import com google firebase messaging RemoteMessage   public class NotificationActivity extends AppCompatActivity    private Activity context    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       context   this      Bundle extras   getIntent   getExtras         Log d Application APPTAG   NotificationActivity - onCreate - extras      extras        if  extras    null            context finish            return             RemoteMessage msg    RemoteMessage  extras get  msg         if  msg    null            context finish            return             RemoteMessage Notification notification   msg getNotification         if  notification    null            context finish            return             String dialogMessage      try           dialogMessage   notification getBody          catch  Exception e           context finish            return            String dialogTitle   notification getTitle        if  dialogTitle    null    dialogTitle length      0            dialogTitle                  AlertDialog Builder builder   new AlertDialog Builder new ContextThemeWrapper context  R style myDialog        builder setTitle dialogTitle       builder setMessage dialogMessage       builder setPositiveButton getResources   getString R string accept   new DialogInterface OnClickListener             public void onClick DialogInterface dialog  int whichButton                dialog cancel                          AlertDialog alert   builder create        alert show            5- Add these lines to your app Manifest  inside your  tags       lt service         android name   MyFirebaseMessagingService          android exported  false  gt           lt intent-filter gt               lt action android name  com google firebase MESSAGING EVENT    gt           lt  intent-filter gt       lt  service gt        lt meta-data android name  com google firebase messaging default notification channel id  android value   string default notification channel id   gt        lt activity android name   NotificationActivity          android theme   style myDialog  gt   lt  activity gt        lt meta-data         android name  com google firebase messaging default notification icon          android resource   drawable notification icon   gt        lt meta-data         android name  com google firebase messaging default notification color          android resource   color color accent    gt    6- add these lines in your Application java onCreate   method  or in MainActivity class onCreate   method            notifications channel creation   if  Build VERSION SDK INT  gt   Build VERSION CODES O             Create channel to show notifications        String channelId   getResources   getString  default channel id          String channelName   getResources   getString  General announcements          NotificationManager notificationManager   getSystemService NotificationManager class         notificationManager createNotificationChannel new NotificationChannel channelId                channelName  NotificationManager IMPORTANCE LOW          Done     Now for this to work well in the 3 mentioned scenarios  you have to send the notification from the Firebase web console in the following way   In the Notification section      Notification Title   Title to display in the notification dialog  optional      Notification text   Message to show to the user  required  Then in the Target section      App   your Android app and in Additional Options section      Android Notification Channel   default channel id     Custom Data         key  title  value   same text here than in the Title field of the Notification section          key  body   value   same text here than in the Message field of the Notification section          key click action value   MainActivity      Sound Disabled      Expires 4 weeks  You can debug it in the Emulator with API 28 with Google Play   Happy coding

User · Answer

The easy way to send messages even if the app is in background and foreground as follow - To send a message using API  you can use a tool called AdvancedREST Client  its a chrome extension  and send a message with the following parameters   Rest client tool Link   https   chrome google com webstore detail advanced-rest-client hgmloofddffdnphfgcellkdfbfbjeloo  use this url -   https   fcm googleapis com fcm send Content-Type application json Authorization key Your Server key From or Authoization key see below ref      data          image    https   static pexels com photos 4825 red-love-romantic-flowers jpg        message    Firebase Push Message Using API       AnotherActivity    True             to     device id Or Device token      Authorization key can be obtained by visiting Google developers console and click on Credentials button on the left menu for your project  Among the API keys listed  the server key will be your authorization key   And you need to put tokenID of the receiver in the    to    section of your POST request sent using API

[android] How to handle notification when app in background in Firebase

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