Develop Reference

Android 11 - Foreground service notification isn't visible

I have an android app that makes use of Foreground Services. My foreground service is supposed to display a notification.
I have updated one of my devices to Android 11 and the foreground service's notification is not being displayed. The foreground notification works as expected and is visible on all previous versions.
My code for starting a foreground service with a notification is as follows:
String channelName = "MyChannel";
NotificationChannel chan = new NotificationChannel("com.my.package", channelName, NotificationManager.IMPORTANCE_NONE);
chan.setLightColor(Color.BLUE);
chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.createNotificationChannel(chan);
RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.my_layout);
remoteViews.setImageViewResource(R.id.my_notification_id, R.drawable.my_icon);
remoteViews.setTextViewText(R.id.my_title, "Title");
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, "com.my.package");
notificationBuilder.setOngoing(true)
.setSmallIcon(R.drawable.ic_image_icon)
.setContentTitle("My Title")
.setPriority(NotificationManager.IMPORTANCE_MIN)
.setCategory(Notification.CATEGORY_SERVICE)
.setStyle(new android.support.v4.media.app.NotificationCompat.DecoratedMediaCustomViewStyle()
.setMediaSession(new MediaSessionCompat(context, MY_TAG).getSessionToken()))
.setColor(0x169AB9)
.setWhen(System.currentTimeMillis())
.setOnlyAlertOnce(true)
.setColorized(true);
PendingIntent contentIntent = PendingIntent.getActivity(context, MYMConstants.NOTIFICATION_GO_TO_ACTIVITY_REQUEST_CODE,
new Intent(context, MainActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
notificationBuilder.setContent(remoteViews);
notificationBuilder.setContentIntent(contentIntent);
Notification notification = notificationBuilder.build();
startForeground(10000, notification);
The foreground service is started as follows:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
context.startForegroundService(serviceIntent);
} else {
context.startService(serviceIntent);
}
I searched for the official documentation on Android 11 and underlying changes to Foreground services, but I couldn't find anything. Could someone help me out with this?

Nothing has changed the way how notifications are added to Foreground Service as part of Android 11.
I did find where the problem lies though. This piece of code above was causing the problem.
.setStyle(new android.support.v4.media.app.NotificationCompat.DecoratedMediaCustomViewStyle()
.setMediaSession(new MediaSessionCompat(context, MY_TAG).getSessionToken()))
Removing this fixed the issue.
To utilize setStyle(), we need to replace android.support.v4.media.app by androidx.media.app.

Android - notification does not appear in status bar

When starting an IntentService to upload a file in the background, I want to show a notification to the user that the upload is in progress by calling showNotification() from inside my service:
private void showNotification() {
Notification notification = new Notification.Builder(this)
.setSmallIcon(R.drawable.ic_cloud_upload_black_24dp)
.setWhen(System.currentTimeMillis())
.setContentTitle("Uploading")
.setContentText("Your upload is in progress.")
.setOngoing(true)
.build();
mNotificationManager.notify(NOTIFICATION_ID, notification);
}
Now here's my problem: the notification appears on the lock screen, but not in the status bar when the screen is unlocked. What am I missing?
Deployment target is API level 24, so a missing NotificationChannel should not be the cause.

try it :
PendingIntent pendingIntent = PendingIntent.getActivity(getmContext(), 0, new Intent(getmContext(), MainActivity.class), 0);
android.app.Notification pp = new NotificationCompat.Builder(getmContext())
.setSmallIcon(R.drawable.ic_launcher_background)
.setContentText(getMessage())
.setContentIntent(pendingIntent)
.build();
NotificationManager notificationManager = (NotificationManager) getmContext().getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(0, pp);

This is my code which is working fine with target SDK 25
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
mContext);
NotificationCompat.InboxStyle inboxStyle = new NotificationCompat.InboxStyle();
inboxStyle.addLine(message);
Notification notification;
notification = mBuilder.setSmallIcon(icon).setTicker(title).setWhen(0)
.setAutoCancel(true)
.setContentTitle(title)
.setContentIntent(resultPendingIntent)
.setStyle(inboxStyle)
.setSmallIcon(R.mipmap.ic_launcher)
.setLargeIcon(BitmapFactory.decodeResource(mContext.getResources(), icon))
.setContentText(message)
.build();
NotificationManager notificationManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(NOTIFICATION_ID, notification);
where NOTIFICATION_ID
public static final int NOTIFICATION_ID = 100;

I feel so dumb. Turns out the notification was displayed all the time, but with a black icon on black background.
Changed the icon colour in the xml from
android:fillColor="#FF000000"
to
android:fillColor="#FFFFFFFF"
and it works like a charm

How to create Notification.contentView in android Nougat and above?

I use Notification.contentView to replicate notification views:
View notificationView = notification.contentView.apply(context, parent);
Unfortunately as of version N, Notification.contentView may be null and deprecated, so how can I create Notification.contentView manually?
Generally I create notification this way:
NotificationCompat.Builder builder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
builder.setAutoCancel(true)
.setColor(ContextCompat.getColor(this, R.color.colorAccent))
.setContentTitle(title)
.setContentText(text)
.setDefaults(Notification.DEFAULT_ALL)
.setWhen(when)
.setSmallIcon(smallIcon);
Then if I create the contentView manually, what can I do to map all the above settings?
Important note: I don't call setCustomContentView, I want to reproduce a contentView for the standard notification.

Notification.contentView()
YES From android N, this field may be null
The notification view is determined by the inputs to Notification.Builder; a custom RemoteViews can optionally be supplied with Notification.Builder.setCustomContentView(RemoteViews)
SAMPLE CODE
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
String NOTIFICATION_CHANNEL_ID = "Nilesh_channel";
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel notificationChannel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, "Your Notifications",
NotificationManager.IMPORTANCE_HIGH);
notificationChannel.setDescription("");
notificationChannel.enableLights(true);
notificationChannel.enableVibration(true);
mNotificationManager.createNotificationChannel(notificationChannel);
}
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
RemoteViews notificationView = new RemoteViews(getPackageName(), R.layout.custom_layout);
notificationBuilder.setAutoCancel(true)
.setColor(ContextCompat.getColor(this, R.color.colorAccent))
.setContentTitle(getString(R.string.app_name))
.setContentText("")
.setDefaults(Notification.DEFAULT_ALL)
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.drawable.ic_launcher_background)
.setCustomContentView(notificationView) // set here your RemoteViews
.setAutoCancel(true);
OUTPUT

Answer my own question:
Create contentView by Notification.Builder:
builder.createContentView();
Create contentView by Notification:
Notification.Builder.recoverBuilder(context, notification).createContentView();
Since Notification.Builder.createContentView() was introduced in api level 24, so the above code can only be called from Nougat 7.0 or newer devices; For a lower version phones, it's always safe to reference non-null Notification.contentView directly, it's created automatically by the android system after builder.build() was called.

Status Bar Notification Not Showing?

I have a simple method which onclick() of a Button should generate status bar notification, but for some reason, it isn't showing up.
public void createNotification() {
NotificationCompat.Builder builder = new NotificationCompat.Builder(this)
.setSmallIcon(android.R.drawable.ic_dialog_alert)
.setContentTitle("Notification!")
.setContentText("This is my first notification!");
Notification notification = builder.build();
NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
notificationManager.notify(0, notification);
}

In Android 8 (API level 26), all notifications must be assigned to a channel.
This work for me:
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getContext(), CHANNEL_ID)
.setSmallIcon(R.drawable.emo_no_paint_120)
.setContentTitle("title")
.setContentText("content")
.setColor(Color.parseColor("#009add"))
.setAutoCancel(true);
NotificationManager notificationManager = (NotificationManager) getContext().getSystemService(
NOTIFICATION_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel mChannel = new NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_HIGH);
notificationManager.createNotificationChannel(mChannel);
}
notificationManager.notify(0, mBuilder.build());
And you should add AppCompat library
implementation 'com.android.support:support-compat:27.1.0'
You could check official Android Docs

Your code is okay. But since you are targeting Android 8.0, you need to implement Notification Channels since this the preferred way in Android Oreo.
https://developer.android.com/guide/topics/ui/notifiers/notifications.html

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);