Develop Reference

setgroup() in notification not working

I'm tring to create notification group, this is my code:
// Build the notification, setting the group appropriately
Notification notif = new NotificationCompat.Builder(getApplicationContext())
.setContentTitle("New mail from " + 1)
.setContentText("cv")
.setSmallIcon(R.drawable.rh_logo)
.setStyle(new NotificationCompat.InboxStyle()
.addLine("Alex Faaborg Check this out")
.addLine("Jeff Chang Launch Party")
.setBigContentTitle("2 new messages")
.setSummaryText("johndoe#gmail.com"))
.setGroup(GROUP_KEY_EMAILS)
.setGroupSummary(true)
.build();
// Issue the notification
NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(++NOTIFICATION_ID, notif);
When I run the app, and send notification messages, they do not show in group.
Can someone explain me what I need to change?

You have to create a group notification before creating your custom notification. Just like this:
NotificationCompat.Builder groupBuilder =
new NotificationCompat.Builder(context)
.setContentTitle(title)
.setContentText(content)
.setGroupSummary(true)
.setGroup("GROUP_1")
.setStyle(new NotificationCompat.BigTextStyle().bigText(content))
.setContentIntent(pendingIntent);
Do not forget setGroupSummary to true.
Then create your child notification which group value is same to groupBuilder's value。Here is "GROUP_1".
NotificationCompat.Builder builder =
new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.ic_stat_communication_invert_colors_on)
.setContentTitle(title)
.setContentText(content)
.setGroup("GROUP_1")
.setStyle(new NotificationCompat.BigTextStyle().bigText(content))
.setContentIntent(pendingIntent)
Finally use NoticationManagerCompat to notify them.
NotificationManagerCompat manager = NotificationManagerCompat.from(context);
manager.notify(GROUP_ID, groupBuilder.build());
manager.notify(id, builder.build());

Replace
NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(++NOTIFICATION_ID, notif);
with
NotificationManagerCompat.from(mCtx).notify(++NOTIFICATION_ID,notif);
because you are using NotificationCompat

There is a strange behavior of notification. If you add autocancel notification group doesn't work, if you add setGroup or setGroupSummary. It will not work. Removing all that fixed the problem for me. Basically, you don't need to mention any group it will auto group. TESTED on Redmi 10 pr0, Poco x3 NFC, huawei device.
return new NotificationCompat.Builder(context, CHANNEL_ID)
.setSmallIcon(R.drawable.ic_action_name)
.setContentTitle(title)
.setContentText(body)
.setStyle(new NotificationCompat.BigTextStyle().bigText(body))
.setPriority(NotificationCompat.PRIORITY_LOW);

Notification doesn't show but doesn't throw any error altough [Android]

I've just updated my ic_launcher in my android application (made in Android Studio, btw). I'm trying to create a test notification, and it used to work, but now it doesn't and I don't know why.
Notification.Builder builder = new Notification.Builder(this);
builder
.setWhen(System.currentTimeMillis())
.setContentTitle("TEST")
.setContentText("Hello! This is a notification test!")
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher));
NotificationManager NoMa = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
NoMa.notify(1, builder.build());
It doesn't even work if I remove the setLargeIcon line, which in my point of view makes no sense. I don't discard the possibility that there's something wrong with my code. Thanks.

You have to setSmallIcon() if you want to show any notification.
So change your code to
Notification.Builder builder = new Notification.Builder(this);
builder
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.mipmap.ic_launcher) //Any icon you want
.setContentTitle("TEST")
.setContentText("Hello! This is a notification test!")
.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher));
NotificationManager NoMa = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
NoMa.notify(1, builder.build());

Android:Modify Pending Notification's Content

I am trying to modify existing notifications in android.
What I have in my app
When a notification is already in system tray and another notification appears, the second one overwrites the first notification content.
What I am looking for
If second Notification arrives then instead of overwriting the first I need to change title to show 2 New Messages and go on incrementing as notifications arrive.
Code Implemented
Bitmap icon = BitmapFactory.decodeResource(ctx.getResources(),
R.drawable.icon);
Intent launchActivity = new Intent(ctx, CordovaApp.class);
launchActivity.putExtra("heading",newsHeader);
launchActivity.putExtra("content",newsText);
PendingIntent pi = PendingIntent.getActivity(ctx,0, launchActivity, PendingIntent.FLAG_NO_CREATE);
ParseAnalytics.trackAppOpened(launchActivity);
if(pi==null){
Log.d(TAG, "Pending Intenet is null.");
}else{
Log.d(TAG, "Pending Intenet is not null.");
}
Notification noti = new NotificationCompat.Builder(ctx)
.setContentTitle(newsHeader)
.setContentText(newsText)
.setSmallIcon(R.drawable.icon)
.setLargeIcon(icon)
.setContentIntent(pi)
.setAutoCancel(true)
.build();
NotificationManager nm = (NotificationManager)ctx.getSystemService(Context.NOTIFICATION_SERVICE);
nm.notify(0, noti);
Update
I implemented the solution mentioned below by #yogendra and now I am getting two separate notifications. Instead of getting stacked. Below is updated code
Notification noti = new NotificationCompat.Builder(ctx)
.setContentTitle(newsHeader)
.setContentText(newsText)
.setSmallIcon(R.drawable.icon)
.setGroup(GROUP_KEY_EMAILS)
.setLargeIcon(icon)
.setContentIntent(pi)
.setLights(Color.parseColor("green"), 5000, 5000)
.setAutoCancel(true)
.setPriority(2)
.setTicker("Notification from App")
.setGroupSummary(true)
.build();
NotificationManager nm = (NotificationManager)ctx.getSystemService(Context.NOTIFICATION_SERVICE);
int timeSeconds = (int)System.currentTimeMillis()%Integer.MAX_VALUE;
Log.i(TAG,"Timing function called "+timeSeconds);
nm.notify(timeSeconds, noti);

See your code
nm.notify(0, noti);
where
notify(int id, Notification notification)
Here 0 is the ID of notification which is to be managed with respect to each notification. If you want to show a different notification your notification id should be unique each time. If you try to post a notification with the same notification id your previously displayed notification will be replaced with the latest notification.
Solution
Now you need to display a custom notification with a custom layout and update the counter each time .
Source code to create a Custom Notification.

create global variable in your class :
private int count = 0;
private ArrayList<String> notificationList = new ArrayList<String>();
private String GROUP_KEY_EMAILS = "email";
/call method createNotification when you need to create notification and pass message what you need to show on message./
private void createNotification(String notificationMassage) {
notificationList.add(notificationMassage);
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
Bitmap largeIcon = BitmapFactory.decodeResource(getResources(),
R.drawable.ic_launcher);
// Create builder
Builder summaryNotification = new NotificationCompat.Builder(this)
.setContentTitle(notificationList.size()+" new messages")
.setSmallIcon(R.drawable.settings)
.setLargeIcon(largeIcon)
.setGroup(GROUP_KEY_EMAILS)
.setGroupSummary(true)
.setAutoCancel(true);
// Create style
InboxStyle nStyle = new NotificationCompat.InboxStyle();
nStyle.setBigContentTitle(notificationList.size()+" new messages");
nStyle.setSummaryText("Summery Text...<you can set as blank>");
for (String Str : notificationList) {
nStyle.addLine(Str);
}
summaryNotification.setStyle(nStyle);
mNotificationManager.notify(0, summaryNotification.build());
count++;
}
/**
please clear notification array list after tap on notification.
*/
For more detail please refer below link:
https://developer.android.com/training/wearables/notifications/stacks.html#AddGroup
https://developer.android.com/training/wearables/notifications/stacks.html#AddGroup

Android notification button in normal view

I want to add a pause button and if possible a remove button in the notifications.
Like this:
How can I do this?
This is my Code for the notification:
notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
context = getApplicationContext();
builder = new NotificationCompat.Builder(context)
.setContentTitle("Go!")
.setContentText("Timer set to " + waitingtime/1000 + " seconds")
.setTicker("Started!")
.setWhen(System.currentTimeMillis())
.setDefaults(Notification.DEFAULT_SOUND)
.setAutoCancel(false)
.setOngoing(true)
.setSmallIcon(R.drawable.notlogosmall);

You will need to add a custom view, it is like how you show views on a home screen widget:
Look at this method on the Notification Builder
http://developer.android.com/reference/android/support/v4/app/NotificationCompat.Builder.html#setContent(android.widget.RemoteViews)
Pass it your RemoteView with the two buttons you want in the layout.
small example:
RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.custom_notification);
NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_launcher)
.setContent(remoteViews);

Implement expand and collapse notification android

I need to implement expand and collapse notification in status bar for android 4.0 and above version. I have search on google for this but didn't getting any code solution for implementation does anybody have I idea how to implement this
Thank You in advance

An expandable Notification is a special case of a Notification Big View. If the Big View is not at the top of the notification drawer, it it shown 'closed' and is expandable by swipe. Quote from Android Developers:
A notification's big view appears only when the notification is expanded, which happens when the notification is at the top of the notification drawer, or when the user expands the notification with a gesture. Expanded notifications are available starting with Android 4.1.
The Big View Notification can be created as follows:
Notification notification = new Notification.BigTextStyle(builder)
.bigText(myText).build();
or
Notification notification = new Notification.BigPictureStyle(builder)
.bigPicture(
BitmapFactory.decodeResource(getResources(),
R.drawable.my_picture)).build();
Here is a tutorial.

Notification noti = new Notification.Builder()
... // The same notification properties as the others
.setStyle(new Notification.BigPictureStyle().bigPicture(mBitmap))
.build();
You change
.setStyle(new NotificationCompat.BigTextStyle().bigText(th_alert))
along with the announcement OK !!!
notification = new NotificationCompat.Builder(context)
Here is an example:
Expandable Notifications and Notifications Groups
You can set Code
Intent intent = new Intent(context, ReserveStatusActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
NotificationManager notificationManager =
(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
intent = new Intent(String.valueOf(PushActivity.class));
intent.putExtra("message", MESSAGE);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
stackBuilder.addParentStack(PushActivity.class);
stackBuilder.addNextIntent(intent);
// PendingIntent pendingIntent =
stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
// android.support.v4.app.NotificationCompat.BigTextStyle bigStyle = new NotificationCompat.BigTextStyle();
// bigStyle.bigText((CharSequence) context);
notification = new NotificationCompat.Builder(context)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(th_title)
.setContentText(th_alert)
.setAutoCancel(true)
// .setStyle(new Notification.BigTextStyle().bigText(th_alert) ตัวเก่า
// .setStyle(new NotificationCompat.BigTextStyle().bigText(th_title))
.setStyle(new NotificationCompat.BigTextStyle().bigText(th_alert))
.setContentIntent(pendingIntent)
.setNumber(++numMessages)
.build();
notification.sound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
notificationManager.notify(1000, notification);
or
private void sendNotification(RemoteMessage.Notification notification, Map<String, String> data) {
Bitmap icon = BitmapFactory.decodeResource(getResources(), R.drawable.logo);
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
// .setContentTitle(notification.getTitle())
.setContentTitle(getResources().getText(R.string.app_name))
.setContentText(notification.getBody())
.setAutoCancel(true)
.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
.setContentIntent(pendingIntent)
.setStyle(new NotificationCompat.BigTextStyle().bigText(notification.getBody()))
.setContentInfo(notification.getTitle())
.setLargeIcon(icon)
.setColor(Color.RED)
.setSmallIcon(R.drawable.logo);
try {
String picture_url = data.get("picture_url");
if (picture_url != null && !"".equals(picture_url)) {
URL url = new URL(picture_url);
Bitmap bigPicture = BitmapFactory.decodeStream(url.openConnection().getInputStream());
notificationBuilder.setStyle(
new NotificationCompat.BigPictureStyle().bigPicture(bigPicture).setSummaryText(notification.getBody())
);
}
} catch (IOException e) {
e.printStackTrace();
}
notificationBuilder.setDefaults(Notification.DEFAULT_VIBRATE);
notificationBuilder.setLights(Color.YELLOW, 1000, 300);
NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, notificationBuilder.build());
}
27/07/2021 :
You should can read detail this : Expandable Notifications and Notifications Groups

I Couldn't able to set new instance of new NotificationCompat.BigTextStyle() in .setStyle() method of Notification. So I have used the below one, new instance of new Notification.BigTextStyle() in .setStyle().
Notification builder =new Notification.Builder(this)
.setSmallIcon(Notification_icons[icon])
.setContentTitle(title)
.setContentText(description)
.setChannelId(channelID_Default)
.setOngoing(true)
.setStyle(new Notification.BigTextStyle()
.bigText(description))
.build();

There is a method for this function you can show a small icon when notification collapsed and show a large one when a notification expanded.
val bitmap = BitmapFactory.decodeResource(resources, R.drawable.notification)
var notification = NotificationCompat.Builder(context, CHANNEL_ID)
.setSmallIcon(R.drawable.new_post)
.setContentTitle(imageTitle)
.setContentText(imageDescription)
.setLargeIcon(bitmap)
.setStyle(NotificationCompat.BigPictureStyle()
.bigPicture(bitmap)
.bigLargeIcon(null))
.build()

(2021) Stumbled upon this question when I was having issues with expanding my notification which had a larger text.
Solved by referring to the Android docs on Expandable Notifications: Create an Expandable Notification
Nimisha V's answer shows how to expand a large image on a notification. The below code is used for expanding large text on a notification.
var notification = NotificationCompat.Builder(context, CHANNEL_ID)
.setSmallIcon(R.drawable.icon)
.setContentTitle(notification_title)
.setContentText(notification_message)
.setStyle(NotificationCompat.BigTextStyle()
.bigText(notification_message))
.build()

We can't create expandable notification in below android 4.1 versions.
But Instead of this we can do that we can stacked the notifications and then we can set a pending intent to our pretty custom activity which shows all notification in list.
User will happy to see this :)