Develop Reference

Notification Group not working without summary

I am implementing notifications and want to group them for display in notification bar.
Currently I am implementing the example from
Create a Group of Notifications in Android's official developer documentation.
I implemented this method:
private void makeNotification()
{
createNotificationChannel();
int SUMMARY_ID = 0;
String GROUP_KEY_WORK_EMAIL = "com.android.example.WORK_EMAIL";
String CHANNEL_ID = "MY_CHANNEL_ID";
Notification newMessageNotification1 =
new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID)
.setSmallIcon(R.drawable.ic_map_position_icon)
.setContentTitle("First summary")
.setContentText("You will not believe...")
.setGroup(GROUP_KEY_WORK_EMAIL)
.build();
Notification newMessageNotification2 =
new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID)
.setSmallIcon(R.drawable.ic_map_nav_position_icon_grey)
.setContentTitle("Second summary")
.setContentText("Please join us to celebrate the...")
.setGroup(GROUP_KEY_WORK_EMAIL)
.build();
Notification summaryNotification =
new NotificationCompat.Builder(MainActivity.this, CHANNEL_ID)
.setContentTitle("Total summary")
.setContentText("Two new messages")
.setSmallIcon(R.drawable.ic_wdw_dont_drive)
.setGroup(GROUP_KEY_WORK_EMAIL)
.setGroupSummary(true)
.build();
NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
notificationManager.notify(1, newMessageNotification1);
notificationManager.notify(2, newMessageNotification2);
notificationManager.notify(SUMMARY_ID, summaryNotification);
}
The method createNotificationChannel()just creates the channel, I left it out here for better readability.
Now the documentation says:
On Android 7.0 (API level 24) and higher, the system automatically builds a summary for your group using snippets of text from each notification.
So the last notify() call shall be optional and creating the summaryNotification, too. But this example only works for me when I notify the summary notification. When I don't do that, the notifications are not grouped.
What is going wrong here?

On Android 7.0 (API level 24) and higher, the system automatically builds a summary for your group using snippets of text from each notification.
"Summary [text]" but not "Group summary notification". This just means that whatever text you set in summary notification style it will be replaced by combined text from grouped notifications for Android >= N.
This doesn't affect the fact that the notifications are not grouped without summary.
Yes, this was highly misleading for me too, had to learn it the hard way. Try building the group on Kitkat and compare it to Nougat one.

Mixpanel push notification text not getting enlarged on Android devices

Account details on Mixpanel:
maaz.shaikh#bwellthy.com
Notification text: Hey {{USER_NICK_NAME}}, you can check your HbA1c test result by clicking on it, then click GET STARTED to start your journey with us.
Notification custom packet: { "mp_icnm_l": "app_logo", "mp_icnm_w": "notification_logo", "mp_color": "#FF7531", "sound": "yes", "vibrate": "yes"}
The notification pops up on android device like this, but does not enlarge on dragging it downwards
I am using the latest release of Mixpanel(v5.2.1) in the Android code.
Mixpanel is using BigStyle Text notifications in their library, so ideally the single line notification on dragging should enlarge on dragging it.
Can you tell me the possible reason for this?

Use BigTextStyle for setting big text in notification.
Notification notification = new Notification.Builder(mContext)
.setContentTitle("New mail from " + sender.toString())
.setContentText(subject)
.setSmallIcon(R.drawable.new_mail)
.setLargeIcon(aBitmap)
.setStyle(new Notification.BigTextStyle()
.bigText(aVeryLongString))
.build();

How to show notification from Android wear watchface

I am trying to show a notification from my Watch face, as I want to show additional information when the user first opens the watchface.
This is similar to the GMT watch face that is installed with the LG G Watch R, that asks the user to swipe left to select the timezone.
This code does not seem to work for me:
Notification.Builder builder = new Notification.Builder(context)
.setContentTitle("Title")
.setContentText("Content");
((NotificationManager) getSystemService(NOTIFICATION_SERVICE))
.notify(1, builder.build());
This was copied from one of Android wear's examples (was not used in a watchface example, just a regular wear app)

You are most likely missing the icon, you need to specify the icon for Android to show your notification. Try specifying everything that the example from the docs mentions:
Notification noti = new Notification.Builder(mContext)
.setContentTitle("New mail from " + sender.toString())
.setContentText(subject)
.setSmallIcon(R.drawable.new_mail)
.setLargeIcon(aBitmap)
.build();

Android parse push notification with message count like whatsapp

Sending push notification .. correct but notification from same parse User it shows repeated messages .I want message count like whatsapp.....pls help me

That is called InboxStyle Notification, here is sample code to implement that.
Notification notification = new Notification.InboxStyle(new Notification.Builder(context)
.setTicker(message)
.setSmallIcon(icon)
.setContentTitle(title)
.setContentText(subTitle)
.setNumber(3)
.setContentIntent(intent))
.addLine("Hi")
.addLine("Hello")
.addLine("How are you?")
.setBigContentTitle("Custom message")
.setSummaryText("+8 more")
.build();

Android Notification- Display full message

My Android Application has to be able to send short alerts out to a large group of people. The obvious place to do this is in the notification center. The full notification shows up in the ticker without a problem, but in the notification center a user can only see the first couple words and then an elipsis. The notifications are not long at all, just 10-15 words at the most. How can I make the text wrap down to a new line?
My code to build the notifications is here
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.splash)
.setContentTitle("Student Engauge")
.setContentText(extras.getString("message"))
.setAutoCancel(true)
.setTicker(extras.getString("message"));
final int notificationId = 1;
NotificationManager nm = (NotificationManager) getApplicationContext()
.getSystemService(Context.NOTIFICATION_SERVICE);
nm.notify(notificationId, mBuilder.build());

To show large chunk of text, use the BigTextStyle. Here is a sample code as given in BigTextStyle. This notification will one line of text and will expand to more lines if needed.
Notification noti = new Notification.Builder()
.setContentTitle("New mail from " + sender.toString())
.setContentText(subject)
.setSmallIcon(R.drawable.new_mail)
.setLargeIcon(aBitmap)
.setStyle(new Notification.BigTextStyle()
.bigText(aVeryLongString))
.build();
For android support library
Notification noti = new Notification.Builder()
.setContentTitle("New mail from " + sender.toString())
.setContentText(subject)
.setSmallIcon(R.drawable.new_mail)
.setLargeIcon(aBitmap)
.setStyle(new NotificationCompat.BigTextStyle()
.bigText(aVeryLongString))
.build();

For Android 4.1 and later devices, big view is the most suitable solution to show large amount of text. For pre 4.1 devices, you can use custom notification layout to show more data like mentioned here. But you should keep in mind two things:
From the official documentation
Caution: When you use a custom notification layout, take special care to ensure that your custom layout works with different device orientations and resolutions. While this advice applies to all View layouts, it's especially important for notifications because the space in the notification drawer is very restricted. Don't make your custom layout too complex, and be sure to test it in various configurations.
Custom notification layouts have some limitations. Too long texts are not shown fully, but 10-15 words probably fit to the custom layout. This answer has more info about the limitation of custom notification layouts