Notification not showing in Oreo

Question

Normal Notification Builder doesn t show notifications on Android O   How could I show notification on Android 8 Oreo   Is there any new piece of code to add for showing notification on Android O

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NotificationCompat Builder notificationBuilder   new NotificationCompat Builder this   CHANNEL ID                             NotificationManager mNotificationManager                NotificationManager  getSystemService Context NOTIFICATION SERVICE        if  Build VERSION SDK INT  gt   Build VERSION CODES O            CharSequence name    Hello     The user-visible name of the channel          int importance   NotificationManager IMPORTANCE HIGH          NotificationChannel mChannel   new NotificationChannel CHANNEL ID  name  importance           mNotificationManager createNotificationChannel mChannel             mNotificationManager notify notificationId  notificationBuilder build

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public class MyFirebaseMessagingServices extends FirebaseMessagingService       private NotificationChannel mChannel      private NotificationManager notifManager       Override     public void onMessageReceived RemoteMessage remoteMessage            if  remoteMessage getData   size    gt  0                try                   JSONObject jsonObject   new JSONObject remoteMessage getData                     displayCustomNotificationForOrders jsonObject getString  title    jsonObject getString  description                   catch  JSONException e                    e printStackTrace                                       private void displayCustomNotificationForOrders String title  String description            if  notifManager    null                notifManager    NotificationManager  getSystemService                      Context NOTIFICATION SERVICE                     if  Build VERSION SDK INT  gt   Build VERSION CODES O                NotificationCompat Builder builder              Intent intent   new Intent this  Dashboard class               intent addFlags Intent FLAG ACTIVITY CLEAR TOP               PendingIntent pendingIntent              int importance   NotificationManager IMPORTANCE HIGH              if  mChannel    null                    mChannel   new NotificationChannel                           0   title  importance                   mChannel setDescription description                   mChannel enableVibration true                   notifManager createNotificationChannel mChannel                             builder   new NotificationCompat Builder this   0                 intent setFlags Intent FLAG ACTIVITY CLEAR TOP                       Intent FLAG ACTIVITY SINGLE TOP               pendingIntent   PendingIntent getActivity this  1251  intent  PendingIntent FLAG ONE SHOT               builder setContentTitle title                         setSmallIcon getNotificationIcon       required                      setContentText description      required                      setDefaults Notification DEFAULT ALL                       setAutoCancel true                       setLargeIcon BitmapFactory decodeResource                              getResources    R mipmap logo                        setBadgeIconType R mipmap logo                       setContentIntent pendingIntent                       setSound RingtoneManager getDefaultUri                              RingtoneManager TYPE NOTIFICATION                Notification notification   builder build                notifManager notify 0  notification             else                Intent intent   new Intent this  Dashboard class               intent addFlags Intent FLAG ACTIVITY CLEAR TOP               PendingIntent pendingIntent   null               pendingIntent   PendingIntent getActivity this  1251  intent  PendingIntent FLAG ONE SHOT                Uri defaultSoundUri   RingtoneManager getDefaultUri RingtoneManager TYPE NOTIFICATION               NotificationCompat Builder notificationBuilder   new NotificationCompat Builder this                       setContentTitle title                       setContentText description                       setAutoCancel true                       setColor ContextCompat getColor getBaseContext    R color colorPrimary                        setSound defaultSoundUri                       setSmallIcon getNotificationIcon                         setContentIntent pendingIntent                       setStyle new NotificationCompat BigTextStyle   setBigContentTitle title  bigText description                 NotificationManager notificationManager    NotificationManager  getSystemService Context NOTIFICATION SERVICE               notificationManager notify 1251  notificationBuilder build                          private int getNotificationIcon             boolean useWhiteIcon    Build VERSION SDK INT  gt   Build VERSION CODES LOLLIPOP           return useWhiteIcon   R mipmap logo   R mipmap logo

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CHANNEL ID in NotificationChannel and Notification Builder must be the same  try this code   String CHANNEL ID    my channel 01   NotificationChannel channel   new NotificationChannel CHANNEL ID   Solveta Unread   NotificationManager IMPORTANCE DEFAULT     Notification Builder notification   new Notification Builder getApplicationContext    CHANNEL ID

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For anyone struggling with this after trying the above solutions  ensure that the channel id used when creating the notification channel is identical to the channel id you set in the Notification builder   const val CHANNEL ID    EXAMPLE CHANNEL ID      create notification channel val notificationChannel   NotificationChannel CHANNEL ID   NOTIFICATION NAME  NotificationManager IMPORTANCE HIGH      building notification NotificationCompat Builder context                       setSmallIcon android R drawable ic input add                       setContentTitle  Title                        setContentText  Subtitle                           setPriority NotificationCompat PRIORITY MAX                       setChannelId CHANNEL ID

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This is bug in firebase api version 11 8 0  So if you reduce API version you will not face this issue

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Well In my case  I have Android 8 1 0 and model number vivo1811   and I have tried with all of the above solutions but Nothing works   So At last  I have written to Firebase Support then on further debugging  I was getting this-   Failed to broadcast to stopped app    Ensure that app has not been force stopped     And this was the reply from Firebase team -      This is a known issue that is caused by a battery optimization   implemented by some OEMs  When an app is swiped away in the app   switcher  the application is treated as if it was force-stopped  which   is not the default Android behavior  The unfortunate side effect of   this is that it can cause the FCM service for your app to stop   running  We are working to improve this behavior from our end  but the   actual fix has to come from the OEM side    Here OEM stands for Original Equipment Manufacturer

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The below piece of code is working for me in the Oreo  you can try this  hope it will work for you  private void sendNotification Context ctx  String title  int notificationNumber  String message  String subtext  Intent intent                try                PendingIntent pendingIntent   PendingIntent getActivity ctx  notificationNumber  intent                      PendingIntent FLAG UPDATE CURRENT               Uri url   null                         NotificationCompat Builder notificationBuilder   null              try                   if  Build VERSION SDK INT  gt   26                         try                          NotificationManager notificationManager    NotificationManager getApplicationContext   getSystemService Context NOTIFICATION SERVICE                           notificationManager deleteNotificationChannel CHANNEL ID 1                           notificationManager deleteNotificationChannel CHANNEL ID 2                            if  intent getStringExtra  type   equalsIgnoreCase    TYPE REQUEST                                NotificationChannel breaking   new NotificationChannel CHANNEL ID 1  CHANNEL ID 1 NAME  NotificationManager IMPORTANCE HIGH                               breaking setShowBadge false                               breaking enableLights true                               breaking enableVibration true                               breaking setLightColor Color WHITE                               breaking setVibrationPattern new long   100  200  100  200  100  200  100                                breaking setSound url new AudioAttributes Builder   build                                  notificationBuilder   new NotificationCompat Builder this CHANNEL ID 1                                       setSmallIcon R mipmap ic launcher                               notificationManager createNotificationChannel breaking                             else                               NotificationChannel politics   new NotificationChannel CHANNEL ID 2 CHANNEL ID 2 NAME  NotificationManager IMPORTANCE DEFAULT                               politics setShowBadge false                               politics enableLights true                               politics enableVibration true                               politics setLightColor Color BLUE                               politics setVibrationPattern new long   100  200  100  200  100                                politics setSound url new AudioAttributes Builder   build                                  notificationBuilder   new NotificationCompat Builder this CHANNEL ID 2                                       setSmallIcon R mipmap ic launcher                               notificationManager createNotificationChannel politics                                                  catch  Exception e                           e printStackTrace                                             else                       notificationBuilder   new NotificationCompat Builder ctx                               setSmallIcon R mipmap ic launcher                                   catch  Exception e                    e printStackTrace                               if  notificationBuilder    null                    notificationBuilder   new NotificationCompat Builder ctx                           setSmallIcon R mipmap ic launcher                               notificationBuilder setContentTitle title                         notificationBuilder setSubText subtext               notificationBuilder setAutoCancel true                notificationBuilder setContentIntent pendingIntent               notificationBuilder setNumber notificationNumber               NotificationManager notificationManager                        NotificationManager  ctx getSystemService Context NOTIFICATION SERVICE                notificationManager notify notificationNumber  notificationBuilder build                catch  Exception e                e printStackTrace

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I was having the same issue on Oreo and discovered that if you first create your Channel with NotificationManager IMPORTANCE NONE  then update it later  the channel will retain the original importance level   This is backed up by the Google Notification training documentation which states      After you create a notification channel  you cannot change the notification behaviors   the user has complete control at that point    Removing and re-installing the app will allow you to reset the channel behaviors    Best to avoid using IMPORTANCE NONE unless you want to suppress the notifications for that Channel  ie  to make use of silent notifications

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You Need to create a notification channel for API level above 26 oreo     NotificationChannel channel   new NotificationChannel STRING ID CHANNEL NAME NotificationManager IMPORTANCE HIGH     STRING ID   string notification channelid is the same as in Notification Builder like this   Notification notification   new Notification Builder this STRING ID               setSmallIcon android R drawable ic menu help               setContentTitle  Hello Notification                setContentText  It is Working                setContentIntent pendingIntent               build       Channel id in the notification and in the notification should be same Whole code is like this            RequiresApi api   Build VERSION CODES O    private void callNotification2          Intent intent   new Intent getApplicationContext   MainActivity class       PendingIntent pendingIntent   PendingIntent getActivity this 11       intent PendingIntent FLAG UPDATE CURRENT       Notification notification   new Notification Builder this  22                setSmallIcon android R drawable ic menu help               setContentTitle  Hello Notification                setContentText  It is Working                setContentIntent pendingIntent               build        NotificationChannel channel   new      NotificationChannel  22   newName  NotificationManager IMPORTANCE HIGH       NotificationManager manager    NotificationManager       getSystemService NOTIFICATION SERVICE       manager createNotificationChannel channel       manager notify 11 notification

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Here s how you do it  private fun sendNotification         val notificationId   100     val chanelid    chanelid      val intent   Intent this  MainActivity  class java      intent setFlags Intent FLAG ACTIVITY NEW TASK or Intent FLAG ACTIVITY CLEAR TASK      val pendingIntent   PendingIntent getActivity this  0  intent  0      if  Build VERSION SDK INT  gt   Build VERSION CODES O       you must create a notification channel for API 26 and Above         val name    my channel          val description    channel description          val importance   NotificationManager IMPORTANCE DEFAULT         val channel   NotificationChannel chanelid  name  importance           channel setDescription description              Register the channel with the system  you can t change the importance            or other notification behaviors after this         val notificationManager   getSystemService NotificationManager  class java          notificationManager createNotificationChannel channel             val mBuilder   NotificationCompat Builder this  chanelid               setSmallIcon R drawable ic notification               setContentTitle  Want to Open My App                 setContentText  Open my app and see good things                setPriority NotificationCompat PRIORITY DEFAULT               setContentIntent pendingIntent               setAutoCancel true     cancel the notification when clicked              addAction R drawable ic check   YES   pendingIntent    add a btn to the Notification with a corresponding intent      val notificationManager   NotificationManagerCompat from this       notificationManager notify notificationId  mBuilder build         Read full tutorial at    https   developer android com training notify-user build-notification

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Try this Code      x000D   x000D  public class FirebaseMessagingServices extends com google firebase messaging FirebaseMessagingService   x000D      private static final String TAG    MY Channel   x000D      Bitmap bitmap  x000D   x000D       Override x000D      public void onMessageReceived RemoteMessage remoteMessage    x000D          super onMessageReceived remoteMessage   x000D          Utility printMessage remoteMessage getNotification   getBody     x000D   x000D             Check if message contains a data payload  x000D          if  remoteMessage getData   size    gt  0    x000D              Log d TAG   Message data payload      remoteMessage getData     x000D   x000D              String title   remoteMessage getData   get  title    x000D              String body   remoteMessage getData   get  body    x000D              String message   remoteMessage getData   get  message    x000D              String imageUri   remoteMessage getData   get  image    x000D              String msg id   remoteMessage getData   get  msg-id    x000D             x000D   x000D              Log d TAG   1      title   x000D              Log d TAG   2      body   x000D              Log d TAG   3      message   x000D              Log d TAG   4      imageUri   x000D             x000D   x000D              if  imageUri    null  x000D                  bitmap   getBitmapfromUrl imageUri   x000D   x000D                x000D   x000D              sendNotification message  bitmap  title  msg id   x000D                       x000D            x000D   x000D   x000D        x000D   x000D      private void sendNotification String message  Bitmap image  String title String msg id    x000D          int notifyID   0  x000D          try   x000D              notifyID   Integer parseInt msg id   x000D            catch  NumberFormatException e    x000D              e printStackTrace    x000D            x000D   x000D          String CHANNEL ID    my channel 01                 The id of the channel  x000D          Intent intent   new Intent this  HomeActivity class   x000D          intent putExtra  title   title   x000D          intent putExtra  message   message   x000D          intent addFlags Intent FLAG ACTIVITY CLEAR TOP   x000D   x000D   x000D          PendingIntent pendingIntent   PendingIntent getActivity this  0    Request code     intent  x000D                  PendingIntent FLAG ONE SHOT   x000D   x000D          Uri defaultSoundUri   RingtoneManager getDefaultUri RingtoneManager TYPE NOTIFICATION   x000D          NotificationCompat Builder notificationBuilder   new NotificationCompat Builder this   01   x000D                   setContentTitle title  x000D                   setSmallIcon R mipmap ic notification  x000D                   setStyle new NotificationCompat BigTextStyle   x000D                           bigText message   x000D                   setContentText message  x000D                   setAutoCancel true  x000D                   setSound defaultSoundUri  x000D                   setChannelId CHANNEL ID  x000D                   setContentIntent pendingIntent   x000D   x000D          if  image    null    x000D              notificationBuilder setStyle new NotificationCompat BigPictureStyle       Set the Image in Big picture Style with text  x000D                       bigPicture image  x000D                       setSummaryText message  x000D                       bigLargeIcon null    x000D            x000D   x000D   x000D          NotificationManager notificationManager   x000D                   NotificationManager  getSystemService Context NOTIFICATION SERVICE   x000D   x000D          if  Build VERSION SDK INT  gt   Build VERSION CODES O             For Oreo and greater than it  we required Notification Channel  x000D             CharSequence name    My New Channel                        The user-visible name of the channel  x000D              int importance   NotificationManager IMPORTANCE HIGH  x000D   x000D              NotificationChannel channel   new NotificationChannel CHANNEL ID name  importance     Create Notification Channel x000D              notificationManager createNotificationChannel channel   x000D            x000D   x000D          notificationManager notify notifyID    ID of notification     notificationBuilder build     x000D        x000D   x000D      public Bitmap getBitmapfromUrl String imageUrl          This method returns the Bitmap from Url  x000D          try   x000D              URL url   new URL imageUrl   x000D              HttpURLConnection connection    HttpURLConnection  url openConnection    x000D              connection setDoInput true   x000D              connection connect    x000D              InputStream input   connection getInputStream    x000D              Bitmap bitmap   BitmapFactory decodeStream input   x000D              return bitmap  x000D   x000D            catch  Exception e    x000D                 TODO Auto-generated catch block x000D              e printStackTrace    x000D              return null  x000D   x000D            x000D   x000D        x000D   x000D    x000D   x000D   x000D

User · Answer

NotificationCompat Builder Context context    already deprecated for version greater than or equal android Oreo  You can change implementation into using   NotificationCompat Builder Context context  String channelId

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Here i post some quick solution function with intent handling  public void showNotification Context context  String title  String body  Intent intent        NotificationManager notificationManager    NotificationManager  context getSystemService Context NOTIFICATION SERVICE        int notificationId   1      String channelId    channel-01       String channelName    Channel Name       int importance   NotificationManager IMPORTANCE HIGH       if  android os Build VERSION SDK INT  gt   android os Build VERSION CODES O            NotificationChannel mChannel   new NotificationChannel                  channelId  channelName  importance           notificationManager createNotificationChannel mChannel              NotificationCompat Builder mBuilder   new NotificationCompat Builder context  channelId               setSmallIcon R mipmap ic launcher               setContentTitle title               setContentText body        TaskStackBuilder stackBuilder   TaskStackBuilder create context       stackBuilder addNextIntent intent       PendingIntent resultPendingIntent   stackBuilder getPendingIntent              0              PendingIntent FLAG UPDATE CURRENT            mBuilder setContentIntent resultPendingIntent        notificationManager notify notificationId  mBuilder build

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In Android O it s a must to use a channel with your Notification Builder below is a sample code      Sets an ID for the notification  so it can be updated  int notifyID   1   String CHANNEL ID    quot my channel 01 quot     The id of the channel   CharSequence name   getString R string channel name     The user-visible name of the channel  int importance   NotificationManager IMPORTANCE HIGH  NotificationChannel mChannel   new NotificationChannel CHANNEL ID  name  importance      Create a notification and set the notification channel  Notification notification   new Notification Builder MainActivity this               setContentTitle  quot New Message quot                setContentText  quot You ve received new messages  quot                setSmallIcon R drawable ic notify status               setChannelId CHANNEL ID               build     Or with Handling compatibility by  NotificationCompat notification           new NotificationCompat Builder this           setSmallIcon R drawable notification icon           setContentTitle  quot My notification quot            setContentText  quot Hello World  quot            setChannelId CHANNEL ID  build     Now make it notify NotificationManager mNotificationManager                NotificationManager  getSystemService Context NOTIFICATION SERVICE    mNotificationManager createNotificationChannel mChannel       Issue the notification  mNotificationManager notify notifyID   notification    or if you want a simple fix then use the following code  NotificationManager mNotificationManager                NotificationManager  getSystemService Context NOTIFICATION SERVICE   if  Build VERSION SDK INT  gt   Build VERSION CODES O           mNotificationManager createNotificationChannel mChannel          Updates  NotificationCompat Builder reference NotificationCompat Builder Context context   This constructor was deprecated in API level 26 0 0 so you should use Builder Context context  String channelId   so no need to setChannelId with the new constructor  And you should use the latest of AppCompat library currently 26 0 2 compile  quot com android support appcompat-v7 26 0   quot   Source from Android Developers Channel on Youtube Also  you could check official Android Docs

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private void addNotification                     NotificationCompat Builder builder                   new NotificationCompat Builder this                   setSmallIcon R drawable ic launcher background                   setContentTitle  Notifications Example                    setContentText  This is a test notification                    Intent notificationIntent   new Intent this  MainActivity class                   PendingIntent contentIntent   PendingIntent getActivity this  0  notificationIntent                  PendingIntent FLAG UPDATE CURRENT                   builder setContentIntent contentIntent                      Add as notification                 NotificationManager manager    NotificationManager  getSystemService Context NOTIFICATION SERVICE                   if  android os Build VERSION SDK INT  gt   android os Build VERSION CODES O                                    NotificationChannel nChannel   new NotificationChannel NOTIFICATION CHANNEL ID   NOTIFICATION CHANNEL NAME   NotificationManager IMPORTANCE HIGH                   nChannel enableLights true                   assert manager    null                  builder setChannelId NOTIFICATION CHANNEL ID                   manager createNotificationChannel nChannel                                     assert manager    null                  manager notify 0  builder build

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fun pushNotification message  String   clickAtion  String             val ii   Intent clickAtion          ii addFlags Intent FLAG ACTIVITY CLEAR TOP          val pendingIntent   PendingIntent getActivity this  REQUEST CODE  ii  PendingIntent FLAG ONE SHOT           val soundUri   RingtoneManager getDefaultUri RingtoneManager TYPE NOTIFICATION           val largIcon   BitmapFactory decodeResource applicationContext resources                  R mipmap ic launcher            val notificationManager   getSystemService Context NOTIFICATION SERVICE  as NotificationManager          val channelId    default channel id          val channelDescription    Default Channel     Since android Oreo notification channel is needed    Check if notification channel exists and if not create one         if  android os Build VERSION SDK INT  gt   android os Build VERSION CODES O                var notificationChannel   notificationManager getNotificationChannel channelId              if  notificationChannel    null                    val importance   NotificationManager IMPORTANCE HIGH   Set the importance level                 notificationChannel   NotificationChannel channelId  channelDescription  importance                    notificationChannel lightColor   Color GREEN   Set if it is necesssary                 notificationChannel enableVibration true    Set if it is necesssary                 notificationManager createNotificationChannel notificationChannel                    val noti builder   NotificationCompat Builder this                           setContentTitle  MMH                            setContentText message                           setSmallIcon R drawable ic launcher background                           setChannelId channelId                           build                   val random   Random                   val id   random nextInt                   notificationManager notify id noti builder                                    else                       val notificationBuilder   NotificationCompat Builder this                       setSmallIcon R mipmap ic launcher  setColor resources getColor R color colorPrimary                        setVibrate longArrayOf 200  200  0  0  0                        setContentTitle getString R string app name                         setLargeIcon largIcon                       setContentText message                       setAutoCancel true                       setStyle NotificationCompat BigTextStyle   bigText message                        setSound soundUri                       setContentIntent pendingIntent                val random   Random               val id   random nextInt               notificationManager notify id  notificationBuilder build

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In android Oreo notification app is done by using channels and NotificationHelper class It should have a channel id and channel name   First u have to create a NotificationHelper Class  public class NotificationHelper extends ContextWrapper    private static final String EDMT CHANNEL ID  com example safna notifier1 EDMTDEV   private static final String EDMT CHANNEL NAME  EDMTDEV Channel   private NotificationManager manager   public  NotificationHelper Context base        super base       createChannels      private void createChannels         NotificationChannel edmtChannel new NotificationChannel EDMT CHANNEL ID EDMT CHANNEL NAME NotificationManager IMPORTANCE DEFAULT       edmtChannel enableLights true       edmtChannel enableVibration true       edmtChannel setLightColor Color GREEN       edmtChannel setLockscreenVisibility Notification VISIBILITY PRIVATE        getManager   createNotificationChannel edmtChannel      public NotificationManager getManager        if  manager  null         manager  NotificationManager getSystemService Context NOTIFICATION SERVICE      return manager     public NotificationCompat Builder getEDMTChannelNotification String title String body        return new NotificationCompat Builder getApplicationContext   EDMT CHANNEL ID               setContentText body               setContentTitle title               setSmallIcon R mipmap ic launcher round               setAutoCancel true             Create a button in activity xml file then In the main activity  protected void onCreate Bundle savedInstanceState         super onCreate savedInstanceState       setContentView R layout activity main        helper new NotificationHelper this        btnSend  Button findViewById R id btnSend        btnSend setOnClickListener new View OnClickListener              Override         public void onClick View v                String title  Title               String content  Content               Notification Builder builder helper getEDMTChannelNotification title content               helper getManager   notify new Random   nextInt   builder build                            Then run ur project

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First of all  if you dont know  from Android Oreo i e API level 26 it s compulsory that notifications are resgitered with a channel  In that case many tutorials might confuse you because they show different example for notification above oreo and below  So here is is a common code which runs on both above and below oreo  String CHANNEL ID    quot MESSAGE quot   String CHANNEL NAME    quot MESSAGE quot    NotificationManagerCompat manager   NotificationManagerCompat from MainActivity this    if  Build VERSION SDK INT  gt   Build VERSION CODES O        NotificationChannel channel   new NotificationChannel CHANNEL ID  CHANNEL NAME      NotificationManager IMPORTANCE DEFAULT       manager createNotificationChannel channel      Notification notification   new NotificationCompat Builder MainActivity this CHANNEL ID           setSmallIcon R drawable ic android black 24dp           setContentTitle TitleTB getText   toString             setContentText MessageTB getText   toString             build    manager notify getRandomNumber    notification      In case you pass a number instead of getRandoNumber   then the new notification will override old one and you wont have more then one notification so to do so u need to pass unique number every time so here is how we can do it by  quot getRandoNumber   quot   private static int getRandomNumber         Date dd  new Date        SimpleDateFormat ft  new SimpleDateFormat   quot mmssSS quot        String s ft format dd       return Integer parseInt s      Video Tutorial  YOUTUBE VIDEO In case you want to download this demo  GitHub Link

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Use this class for Android 8 Notification  public class NotificationHelper    private Context mContext  private NotificationManager mNotificationManager  private NotificationCompat Builder mBuilder  public static final String NOTIFICATION CHANNEL ID    10001    public NotificationHelper Context context        mContext   context            Create and push the notification      public void createNotification String title  String message               Creates an explicit intent for an Activity in your app        Intent resultIntent   new Intent mContext   SomeOtherActivity class       resultIntent addFlags Intent FLAG ACTIVITY NEW TASK        PendingIntent resultPendingIntent   PendingIntent getActivity mContext              0    Request code     resultIntent              PendingIntent FLAG UPDATE CURRENT        mBuilder   new NotificationCompat Builder mContext       mBuilder setSmallIcon R mipmap ic launcher       mBuilder setContentTitle title               setContentText message               setAutoCancel false               setSound Settings System DEFAULT NOTIFICATION URI               setContentIntent resultPendingIntent        mNotificationManager    NotificationManager  mContext getSystemService Context NOTIFICATION SERVICE        if  android os Build VERSION SDK INT  gt   android os Build VERSION CODES O                int importance   NotificationManager IMPORTANCE HIGH          NotificationChannel notificationChannel   new NotificationChannel NOTIFICATION CHANNEL ID   NOTIFICATION CHANNEL NAME   importance           notificationChannel enableLights true           notificationChannel setLightColor Color RED           notificationChannel enableVibration true           notificationChannel setVibrationPattern new long   100  200  300  400  500  400  300  200  400            assert mNotificationManager    null          mBuilder setChannelId NOTIFICATION CHANNEL ID           mNotificationManager createNotificationChannel notificationChannel             assert mNotificationManager    null      mNotificationManager notify 0    Request Code     mBuilder build

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Following method will show Notification  having big text and freeze enabled  Notification will not get removed even after user swipes    We need NotificationManager service  public static void showNotificationOngoing Context context String title            NotificationManager notificationManager                    NotificationManager  context getSystemService NOTIFICATION SERVICE            PendingIntent contentIntent   PendingIntent getActivity context  0                  new Intent context  MainActivity class   PendingIntent FLAG UPDATE CURRENT            Notification Builder notificationBuilder   new Notification Builder context                   setContentTitle title   DateFormat getDateTimeInstance   format new Date            accuracy                   setContentText addressFragments toString                     setSmallIcon R mipmap ic launcher                   setContentIntent contentIntent                   setOngoing true                   setStyle new Notification BigTextStyle   bigText addressFragments toString                      setAutoCancel true           notificationManager notify 3  notificationBuilder build         Method to Remove Notifications  public static void removeNotification Context context       NotificationManager notificationManager                NotificationManager  context getSystemService NOTIFICATION SERVICE       notificationManager cancelAll        Source Link

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Android Notification Demo App for Android O as well as lower API versions   Here is best demo app on GitHub-Demo 1 and GitHub-Demo 2

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If you can t get the push notification in 26  SDK version      your solution is here    public static void showNotification Context context  String title  String messageBody             boolean isLoggedIn   SessionManager getInstance   isLoggedIn            Log e TAG   User logged in state      isLoggedIn            Intent intent   null          if  isLoggedIn                  goto notification screen             intent   new Intent context  MainActivity class               intent putExtra Extras EXTRA JUMP TO  DrawerItems ITEM NOTIFICATION             else                 goto login screen             intent   new Intent context  LandingActivity class                      intent addFlags Intent FLAG ACTIVITY CLEAR TOP           PendingIntent pendingIntent   PendingIntent getActivity context  0    Request code     intent  PendingIntent FLAG ONE SHOT              Uri defaultSoundUri  RingtoneManager getDefaultUri RingtoneManager TYPE NOTIFICATION             Bitmap largeIcon   BitmapFactory decodeResource getResources    R drawable ic app notification icon            String channel id   createNotificationChannel context            NotificationCompat Builder notificationBuilder   new NotificationCompat Builder context  channel id                   setContentTitle title                   setContentText messageBody                   setStyle new NotificationCompat BigTextStyle   bigText messageBody                      setLargeIcon largeIcon                     setSmallIcon R drawable app logo color    needs white icon with transparent BG  For all platforms                   setColor ContextCompat getColor context  R color colorPrimaryDark                    setVibrate new long   1000  1000                    setSound Settings System DEFAULT NOTIFICATION URI                   setContentIntent pendingIntent                   setPriority Notification PRIORITY HIGH                   setAutoCancel true            NotificationManager notificationManager    NotificationManager  context getSystemService Context NOTIFICATION SERVICE           notificationManager notify  int    new Date System currentTimeMillis    getTime     1000L    Integer MAX VALUE     ID of notification     notificationBuilder build            public static String createNotificationChannel Context context                NotificationChannels are required for Notifications on O  API 26  and above          if  Build VERSION SDK INT  gt   Build VERSION CODES O                    The id of the channel              String channelId    Channel id                   The user-visible name of the channel              CharSequence channelName    Application name                  The user-visible description of the channel              String channelDescription    Application name Alert               int channelImportance   NotificationManager IMPORTANCE DEFAULT              boolean channelEnableVibrate   true                int channelLockscreenVisibility   Notification                   Initializes NotificationChannel              NotificationChannel notificationChannel   new NotificationChannel channelId  channelName  channelImportance               notificationChannel setDescription channelDescription               notificationChannel enableVibration channelEnableVibrate                 notificationChannel setLockscreenVisibility channelLockscreenVisibility                   Adds NotificationChannel to system  Attempting to create an existing notification                channel with its original values performs no operation  so it s safe to perform the                below sequence              NotificationManager notificationManager    NotificationManager  context getSystemService Context NOTIFICATION SERVICE               assert notificationManager    null              notificationManager createNotificationChannel notificationChannel                return channelId            else                  Returns null for pre-O  26  devices              return null                    NotificationCompat Builder notificationBuilder   new NotificationCompat Builder context  channel id   -  Here you will get push notification using channel id in your device which is consist 26  SDK version   -  Because  the NotificationCompat Builder context  is deprecated method now you will use an updated version which is having two parameters one is context  other is channel id   -  NotificationCompat Builder context  channel id  updated method  try it   -  In 26  SDK version of device you will create channel id every time

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In addition to this answer  you need to create the notification channel before it can be used     if  Build VERSION SDK INT  gt   Build VERSION CODES O              Create or update           NotificationChannel channel   new NotificationChannel  my channel 01              Channel human readable title              NotificationManager IMPORTANCE DEFAULT         mNotificationManager createNotificationChannel channel         Also you need to use channels only if your targetSdkVersion is 26 or higher   If you are using NotificationCompat Builder  you also need to update to the beta version of the support library  https   developer android com topic libraries support-library revisions html 26-0-0-beta2  to be able to call setChannelId on the compat builder    Be careful as this library update raises minSdkLevel to 14

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I have faced the problem but found a unique solution  for me this was the old code String NOTIFICATION CHANNEL ID    quot com codedevtech emplitrack quot    and the working code is String NOTIFICATION CHANNEL ID    quot emplitrack channel quot    may be the channel id should not contain dot

[android] Notification not showing in Oreo

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