Develop Reference

Notification Count not shown Badges in App Launcher Icon in Android Version 29 and 27

I want to show unread messages count on my android app's launcher icon. It should be cleared only once the user read all messages. I have tried setnumber() in NotificationCompat.Builder. But it is not showing the notification count.
I executed my code in two android devices.
Real Android device - version is 29 (red dot appeared in app launcher when i generate notification)
Android Emulator - version is 27 (nothing is shown)
Notification Channel Creation:
private void createNotificationChannel(String notificationChannelId, String systemTrayNotificationName){
Log.i("Tag","createNotificationChannel "+Build.VERSION.SDK_INT);
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
CharSequence name = systemTrayNotificationName;
String description = systemTrayNotificationName;
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel notificationChannel = new NotificationChannel(notificationChannelId, name,importance);
notificationChannel.setDescription(description);
notificationChannel.setShowBadge(true);
notificationChannel.canShowBadge();
NotificationManager notificationManager = getContext().getSystemService(NotificationManager.class);
notificationManager.createNotificationChannel(notificationChannel);
}
}
Code to form notification
public void buildNotification(){
createNotificationChannel(NOTIFICATION_CHANNEL_ID,SYSTEM_TRAY_NOTIFICATION_NAME);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(getContext(), NOTIFICATION_CHANNEL_ID)
.setSmallIcon(R.drawable.ic_home_black_24dp)
.setLargeIcon(BitmapFactory.decodeResource(getContext().getResources(), R.mipmap.ic_launcher))
.setContentTitle("Title")
.setContentText("Content Text")
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setDefaults(NotificationCompat.DEFAULT_ALL)
.setNumber(5)
.setBadgeIconType(NotificationCompat.BADGE_ICON_NONE)
.setAutoCancel(true);
// Get an instance of the NotificationManager service
NotificationManagerCompat notificationManager =
NotificationManagerCompat.from(getContext());
// Issue the notification with notification manager.
notificationManager.notify(200, notificationBuilder.build());
}

The number of notifications must be supported by the launcher you are using.
As far as I know, the pixel launcher typical of google phones and present by default as launcher3 of the emulators does not support the notification count exactly as it happens in your first case.
You could try with a third party launcher to see if the counting works but as just said this feature must be natively supported by the launcher.

Android notification is not showing as a message

The notification it self is working good, but not as I want. It vibrates and shows the icon defined but not as a Watsapp Notification and in the setCategory I put CATEGORY_MESSAGE but still, nothing!
on my App class i put :
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
NotificationChannel channel = new NotificationChannel(CHANNEL_ID,CHANNEL_NAME,NotificationManager.IMPORTANCE_HIGH);
channel.setDescription(CHANNEL_DESC);
channel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
NotificationManager manager = getSystemService(NotificationManager.class);
assert manager != null;
manager.createNotificationChannel(channel);
}
Fragment :
private void T(String message){
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext(),CHANNEL_ID)
.setContentText(message)
.setContentTitle("Test")
.setColor(0xff123456)
.setSmallIcon(R.drawable.com_facebook_button_icon)
.setCategory(CATEGORY_MESSAGE)
.setPriority(PRIORITY_HIGH);
NotificationManagerCompat compat = NotificationManagerCompat.from(getApplicationContext());
compat.notify(1,mBuilder.build());
}
This is How I want it to notify :
This is how is current notifying
I'm using the SDK 27

After discussing with OP in chat, here's my best explanation about what could have happened:
A notification channel can only be created once, after which it becomes immutable to the app. It can only be tweaked by the user through the Settings. If someone follows the examples in the official docs first, they might create the channel with IMPORTANCE_DEFAULT. After this, even if they change the code later, the channel will remain at level 'High: Make Sound' and not be set to 'Urgent: Make Sound and pop on screen' as desired. Docs on importance level
The code in the question is perfectly fine, and should create a channel with the 'Urgent' level when installed for the first time. In any case, uninstalling the app manually and then installing it again will recreate the channels, setting the level to whatever is mentioned in the latest code.

Android Notification Not working on Android 6.0 (Marshmallow)

I'm implementing local notification on Android and I have the problem that they are not appearing on Android 6.0 (Samsung S7).
I was searching for solutions, but I coulnd't find anything for this problem. I have the icon in the proper res/drawable folder, also I have defined a notification title, text, ringtone (raw folder) but it's not showing up...
There is my code:
Context acontext = getApplicationContext();
PackageManager pm = acontext.getPackageManager();
Intent notificationIntent = pm.getLaunchIntentForPackage(acontext.getPackageName());
notificationIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(acontext, 0, notificationIntent, 0);
int notification_icon = acontext.getResources().getIdentifier("icon", "drawable", acontext.getPackageName());
int notificationID = 0;
// Build notification
Notification noti = new Notification.Builder(acontext)
.setContentTitle("Title")
.setContentText("Incoming text")
.setSmallIcon(notification_icon)
.setContentIntent(pendingIntent)
.setLights(Color.RED, 1, 1)
.build();
NotificationManager notificationManager = (NotificationManager) acontext.getSystemService(Context.NOTIFICATION_SERVICE);
// hide the notification after its selected
noti.sound = Uri.parse("android.resource://" + acontext.getPackageName() + "/raw/incoming");
noti.flags |= Notification.FLAG_AUTO_CANCEL;
notificationManager.notify(notificationID, noti);
Did anyone else experience this problem? Any help would be appreciated. Thank you.

There are some changes in new notification. new NotificationCompat.Builder(this) is deprecated and need NotificationChannelfor android oreo above. You can try this solution.
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(mContext.getApplicationContext(), "notify_001");
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("Title");
bigText.setSummaryText("Text in detail");
mBuilder.setContentIntent(pendingIntent);
mBuilder.setSmallIcon(R.mipmap.ic_launcher_round);
mBuilder.setContentTitle("Your Title");
mBuilder.setContentText("Your text");
mBuilder.setPriority(Notification.PRIORITY_MAX);
mBuilder.setStyle(bigText);
NotificationManager mNotificationManager =
(NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel channel = new NotificationChannel("notify_001",
"Channel human readable title",
NotificationManager.IMPORTANCE_DEFAULT);
mNotificationManager.createNotificationChannel(channel);
}
mNotificationManager.notify(0, mBuilder.build());

There are various layers involved in showing notifications in Android, Please first check if this works for other devices of same OS version. Normally these kind of issues are device specific not OS specific, Also check notification logs how to check notification logs in android ?
If issue is device specific, following can be handy tips:
Check notifications not blocked for your app by device settings.
Check power settings blocking non-priority notifications.
If there are notifications in logs but not showing up, there can be some issue with your internal OS settings/configs. (believe me Android is not very clean OS)
If you can, try factory resetting your device. (In my case this worked)

Google Play Services must be enabled in order to receive push notifications on your Android device. If Google Play Services are enabled and the general troubleshooting steps have not resolved the issue, it may be necessary to reset the app. To reset the app, go to Settings → Apps → PagerDuty and tap Clear Data.
For Android 6.0 and newer, make sure the app is set as a prioritized app in priority mode.
For Android 6.0 and newer, check to see if the app is being silenced by Doze mode.

Check the android version accordingly set the icon for > 6.0 and for other.For 6.0 version we need white background icon.
if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
icon = R.mipmap.your_logo_for_Lolipop;
}else{
icon = R.drawable.your_logo_for_Kitkat ;
}

How to stop heads-up notification being posted via Android Code?

I am building an android app that replaces the notification drawer and show notifications in its own window. I managed to show notifications on my drawer when they are posted by overriding onNotificationPosted() method. But, same notification is also shown by android. So,I want that notifications should be shown ONLY on my window, there are other apps who have done it,so it's not impossible. Please tell me how to override default behavior of android. Thanks in advance. :)
EDIT
What i want is to disable heads-up notification. Any solutions there?

In Oreo and above OS It is in the Notification channel Where you have to set the Priority any thing lesser than NotificationManager.IMPORTANCE_HIGH or some thing like this below stops the heads up banner.
NotificationChannel channel = new NotificationChannel(CHANNEL_ID,
CHANNEL_NAME,
NotificationManager.IMPORTANCE_DEFAULT)
On Pre-Oreo devices, the notification priority itself helps the system to show/hide the heads up banner.
Also remember when you make this change you have to delete the app and reinstall to see the change!

I used NotificationManager.IMPORTANCE_DEFAULT with setPriority(NotificationCompat.PRIORITY_DEFAULT) and it seems to work (Oneplus 3 and Note 8).
String channelId = "ch01";
String channelName = "Status";
int importance = NotificationManager.IMPORTANCE_DEFAULT;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
NotificationChannel mChannel = new NotificationChannel(
channelId, channelName, importance);
notificationManager.createNotificationChannel(mChannel);
}
NotificationCompat.Builder nb = new NotificationCompat.Builder(this, channelId);
nb.setSmallIcon(R.drawable.ic_logo);
nb.setContentTitle(notificationText);
nb.setContentText("");
nb.setContentIntent(mainActivityPendingIntent);
nb.setPriority(NotificationCompat.PRIORITY_DEFAULT);
nb.setOnlyAlertOnce(true);
nb.setOngoing(true);
nb.setWhen(System.currentTimeMillis());

Huh! Looks like Android provides no way to disable heads-up notification of other apps via code.
Here is a little hack!
So, what we need is, not show any heads-up notification from any other app. To solve this, we need to understand that at one time there could be only one heads-up notification on screen.
Hack is, send your own notification right after you listen any notification being posted i.e. in onNotificationPosted() of a NotificationListener subclass.
this.mNotificationManager.notify(12321, new Notification.Builder(this)
.setContentTitle("").setContentText("")
.setSmallIcon(R.drawable.transparent)
.setPriority(Notification.PRIORITY_DEFAULT)
.setFullScreenIntent(this.mBlankIntent, true)
.setAutoCancel(true)
.build());
It will replace the notification of the 3rd app with your almost blank notification. Oh wow! Wait!! This looks ugly.
Ofcourse, Now we need to remove this notification before the user could even see this.
Now that you know package name of the android. You can show cancel your notification some thing like this.
if(packageName.equals("com.my.package")){
mNotificationManager.cancel(12321);
return;
}
So, what we are doing is showing our notification, when any other heads up notification shows up, and then remove our own notification. All this happens so quick that user does not sees any heads-up notification, and for doing this, I did not needed to store the notification in memory even.

Set the IMPORTANCE to LOW and PRIORITY to LOW.
It work for me
var notificationChannel = NotificationChannel(channelId, "Call" , NotificationManager.IMPORTANCE_LOW)
var notification = NotificationCompat.Builder(context,channelId)
.setContentTitle("Calling")
.setContentText("Call")
.setContentIntent(pendingIntent)
.setAutoCancel(true)
.setPriority(NotificationCompat.PRIORITY_LOW)

Android notification is not showing

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);

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.
NotificationManager mNotificationManager;
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(mContext.getApplicationContext(), "notify_001");
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("Today's Bible Verse");
bigText.setSummaryText("Text in detail");
mBuilder.setContentIntent(pendingIntent);
mBuilder.setSmallIcon(R.mipmap.ic_launcher_round);
mBuilder.setContentTitle("Your Title");
mBuilder.setContentText("Your text");
mBuilder.setPriority(Notification.PRIORITY_MAX);
mBuilder.setStyle(bigText);
mNotificationManager =
(NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
// === Removed some obsoletes
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
{
String channelId = "Your_channel_id";
NotificationChannel channel = new NotificationChannel(
channelId,
"Channel human readable title",
NotificationManager.IMPORTANCE_HIGH);
mNotificationManager.createNotificationChannel(channel);
mBuilder.setChannelId(channelId);
}
mNotificationManager.notify(0, mBuilder.build());

Actually the answer by ƒernando 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.

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

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.

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 >= 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);
}
}

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.

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

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

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<InstanceIdResult>() {
#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<Void>() {
#Override
public void onSuccess(Void aVoid) {
}
});
}
});

I encountered a similar problem to yours and while searching for a solution I found these answers but they weren't as direct as I hoped they would be but it gives an Idea; Your notifications may not be showing because for versions >=8 notifications are done relatively differently there is a NotificationChannel which aids in managing notifications this helped me. Happy coding.
void Note(){
//Creating a notification channel
NotificationChannel channel=new NotificationChannel("channel1",
"hello",
NotificationManager.IMPORTANCE_HIGH);
NotificationManager manager=(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
manager.createNotificationChannel(channel);
//Creating the notification object
NotificationCompat.Builder notification=new NotificationCompat.Builder(this,"channel1");
//notification.setAutoCancel(true);
notification.setContentTitle("Hi this is a notification");
notification.setContentText("Hello you");
notification.setSmallIcon(R.drawable.ic_launcher_foreground);
//make the notification manager to issue a notification on the notification's channel
manager.notify(121,notification.build());
}

Make sure your notificationId is unique. I couldn't figure out why my test pushes weren't showing up, but it's because the notification ids were generated based on the push content, and since I was pushing the same notification over and over again, the notification id remained the same.

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.

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);

val pendingIntent = PendingIntent.getActivity(applicationContext, 0, Intent(), 0)
var notification = NotificationCompat.Builder(applicationContext, CHANNEL_ID)
.setContentTitle("Title")
.setContentText("Text")
.setSmallIcon(R.drawable.icon)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setContentIntent(pendingIntent)
.build()
val mNotificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
mNotificationManager.notify(sameId, notification)