Android notification is not showing

Question

I need a program that will add a notification on Android  And when someone clicks on the notification  it should lead them to my second activity   I have established code  The notification should be working  but for some reason it is not working  The Notification isn t showing at all  I don t know what am I missing   Code of those files   Notification n   new Notification Builder this           setContentTitle  New mail from      test gmail com            setContentText  Subject            setContentIntent pIntent  setAutoCancel true           setStyle new Notification BigTextStyle   bigText longText            build     NotificationManager notificationManager    NotificationManager  getSystemService NOTIFICATION SERVICE      Hide the notification after it s selected  notificationManager notify 0  n

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If you are on version    Android 8 1  Oreo  while using a Notification channel  set its importance to high   int importance   NotificationManager IMPORTANCE HIGH  NotificationChannel channel   new NotificationChannel CHANNEL ID  name  importance

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Notifications may not be shown if you show the notifications rapidly one after the other or cancel an existing one  then right away show it again  e g  to trigger a heads-up-notification to notify the user about a change in an ongoing notification   In these cases the system may decide to just block the notification when it feels they might become too overwhelming spammy for the user    Please note  that at least on stock Android  tested with 10  from the outside this behavior looks a bit random  it just sometimes happens and sometimes it doesn t  My guess is  there is a very short time threshold during which you are not allowed to  send too many notifications  Calling NotificationManager cancel   and then NotificationManager notify   might then sometimes cause this behavior   If you have the option  when updating a notification don t cancel it before  but just call NotificationManager notify   with the updated notification  This doesn t seem to trigger the aforementioned blocking by the system

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This tripped me up today  but I realized it was because on Android 9 0  Pie   Do Not Disturb by default also hides all notifications  rather than just silencing them like in Android 8 1  Oreo  and before  This doesn t apply to notifications    I like having DND on for my development device  so going into the DND settings and changing the setting to simply silence the notifications  but not hide them  fixed it for me

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Actually the answer by   ernando Valle doesn t seem to be correct  Then again  your question is overly vague because you fail to mention what is wrong or isn t working   Looking at your code I am assuming the Notification simply isn t showing   Your notification is not showing  because you didn t provide an icon  Even though the SDK documentation doesn t mention it being required  it is in fact very much so and your Notification will not show without one   addAction is only available since 4 1  Prior to that you would use the PendingIntent to launch an Activity  You seem to specify a PendingIntent  so your problem lies elsewhere  Logically  one must conclude it s the missing icon

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For me it was an issue with deviceToken  Please check if the receiver and sender device token is properly updated in your database or wherever you are accessing it to send notifications   For instance  use the following to update the device token on app launch  Therefore it will be always updated properly      Device token for push notifications FirebaseInstanceId getInstance   getInstanceId   addOnSuccessListener    new OnSuccessListener lt InstanceIdResult gt            Override     public void onSuccess InstanceIdResult instanceIdResult             deviceToken   instanceIdResult getToken                Insert device token into Firebase database         fbDbRefRoot child  user detail profile   child currentUserId  child  device token    setValue deviceToken                   addOnSuccessListener                    new OnSuccessListener lt Void gt                            Override                     public void onSuccess Void aVoid

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Creation of notification channels are compulsory for Android versions after Android 8 1  Oreo  for making notifications visible  If notifications are not visible in your app for Oreo  Androids  you need to call the following function when your app starts -  private void createNotificationChannel        Create the NotificationChannel  but only on API 26  because    the NotificationChannel class is new and not in the support library     if  Build VERSION SDK INT  gt   Build VERSION CODES O            CharSequence name   getString R string channel name           String description   getString R string channel description           int importance   NotificationManager IMPORTANCE DEFAULT          NotificationChannel channel   new NotificationChannel CHANNEL ID  name         importance           channel setDescription description              Register the channel with the system  you can t change the importance            or other notification behaviours after this         NotificationManager notificationManager           getSystemService NotificationManager class           notificationManager createNotificationChannel channel

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I had the same issue with my Android app  I was trying out notifications and found that notifications were showing on my Android emulator which ran a Android 7 0  Nougat  system  whereas it wasn t running on my phone which had Android 8 1  Oreo    After reading the documentation  I found that Android had a feature called notification channel  without which notifications won t show up on Oreo devices  Below is the link to official Android documentation on notification channels    Notifications Overview  Notification anatomy Create and Manage Notification Channels

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I think that you forget the   addAction int icon  CharSequence title  PendingIntent intent    Look here  Add Action

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You also need to change the build gradle file  and add the used Android SDK version into it   implementation  com android support appcompat-v7 28 0 0    This worked like a charm in my case

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You were missing the small icon  I did the same mistake and the above step resolved it   As per the official documentation    A Notification object must contain the following     A small icon  set by setSmallIcon       A title  set by setContentTitle   Detail text  set by setContentText   On Android 8 0  API level 26  and higher  a valid notification channel ID  set by setChannelId   or provided in the NotificationCompat Builder constructor when creating a channel    See http   developer android com guide topics ui notifiers notifications html

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The code won t work without an icon  So  add the setSmallIcon call to the builder chain like this for it to work   setSmallIcon R drawable icon    Android Oreo  8 0  and above Android 8 introduced a new requirement of setting the channelId property by using a NotificationChannel  private NotificationManager mNotificationManager   NotificationCompat Builder mBuilder       new NotificationCompat Builder mContext getApplicationContext     quot notify 001 quot    Intent ii   new Intent mContext getApplicationContext    RootActivity class   PendingIntent pendingIntent   PendingIntent getActivity mContext  0  ii  0    NotificationCompat BigTextStyle bigText   new NotificationCompat BigTextStyle    bigText bigText verseurl   bigText setBigContentTitle  quot Today s Bible Verse quot    bigText setSummaryText  quot Text in detail quot     mBuilder setContentIntent pendingIntent   mBuilder setSmallIcon R mipmap ic launcher round   mBuilder setContentTitle  quot Your Title quot    mBuilder setContentText  quot Your text quot    mBuilder setPriority Notification PRIORITY MAX   mBuilder setStyle bigText    mNotificationManager        NotificationManager  mContext getSystemService Context NOTIFICATION SERVICE           Removed some obsoletes if  Build VERSION SDK INT  gt   Build VERSION CODES O        String channelId    quot Your channel id quot       NotificationChannel channel   new NotificationChannel                                          channelId                                           quot Channel human readable title quot                                           NotificationManager IMPORTANCE HIGH      mNotificationManager createNotificationChannel channel     mBuilder setChannelId channelId      mNotificationManager notify 0  mBuilder build

[android] Android notification is not showing

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