Develop Reference

How to create multiple notifications in Kotlin in foreground service

I am working on a parental control app which notify parent multiple times but when I try to create notification with a background service it generates only one 1.
Here is how I do it:
fun createNotification(parent_name: String, notificationText:String, id: Int){
val MchannelId = channelId+id.toString()
if (Build.VERSION.SDK_INT >= 26) {
val channel = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel(
MchannelId,
"Channel human readable title",
NotificationManager.IMPORTANCE_DEFAULT
)
} else {
TODO("VERSION.SDK_INT < O")
}
(getSystemService(NOTIFICATION_SERVICE) as NotificationManager).createNotificationChannel(
channel
)
}
val notificationIntent = Intent(this, TabbedActivity::class.java)
val pendingIntent = PendingIntent.getActivity(
this,
id, notificationIntent, 0
)
val notification: Notification = NotificationCompat.Builder(this, "$MchannelId")
.setContentTitle("Hi $parent_name")
.setContentText(notificationText)
.setSmallIcon(R.drawable.icon_child)
//.setContentIntent(pendingIntent)
.build()
startForeground(random_number, notification)
}
My Full-Service Class:
const val TAG2 = "Child Service"
class ParentService: Service() {
val db = FirebaseFirestore.getInstance()
private val channelId = "Notification from Service"
var parent_name = userName
override fun onBind(intent: Intent?): IBinder? = null
//OnBind Function Implementation
init {
Log.d(TAG2, "Started Service!")
}
//onCreate Method Implementation
override fun onCreate() {
super.onCreate()
}
//OnStartCommand Override
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
Thread{
while (true){
checkStatus()
Thread.sleep(PARENT_CHECK_TIME)
}
}.start()
return START_STICKY
}
private fun checkStatus() {
var listOfNames = ""
var i = 1
val calendar: Calendar = Calendar.getInstance()
var list = ArrayList<String>()
db.collection(LINKED_CHILDS)
.whereEqualTo(USER_PHONE, userPhone)
.get()
.addOnSuccessListener { documents ->
for (document in documents){
val startTime: Long = calendar.getTimeInMillis()
val diff = startTime - (document.data[ACTIVE_STATUS] as Long)
Log.d("TAG", "Time Difference : $diff")
Log.d("TAG", "${document.data[USER_NAME].toString()}")
if (diff> MAX_GAP_TIME){
Log.d("TAG", "Entered IFF")
list.add(document.data[USER_NAME].toString())
}
}
for (name in list){
listOfNames = listOfNames + "$i. Your child $name is not active\n"
i++
createNotification(parent_name, listOfNames, i)
Log.d("TAG Notification ID:", "ID: $i")
}
Log.d("TAG: ", "$listOfNames")
}
}
fun createNotification(parent_name: String, notificationText:String, id: Int){
val MchannelId = channelId+id.toString()
if (Build.VERSION.SDK_INT >= 26) {
val channel = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel(
MchannelId,
"Channel human readable title",
NotificationManager.IMPORTANCE_DEFAULT
)
} else {
TODO("VERSION.SDK_INT < O")
}
(getSystemService(NOTIFICATION_SERVICE) as NotificationManager).createNotificationChannel(
channel
)
}
val notificationIntent = Intent(this, TabbedActivity::class.java)
val pendingIntent = PendingIntent.getActivity(
this,
id, notificationIntent, 0
)
val notification: Notification = NotificationCompat.Builder(this, "$MchannelId")
.setContentTitle("Hi $parent_name")
.setContentText(notificationText)
.setSmallIcon(R.drawable.icon_child)
//.setContentIntent(pendingIntent)
.build()
startForeground(id, notification)
}
}
Kinldy let me know how I can create multiple Notifications using this background service. Thank You so much in advance!
Kinldy let me know how I can create multiple Notifications using this background service. Thank You so much in advance!
Kinldy let me know how I can create multiple Notifications using this background service. Thank You so much in advance!

If you create a non-persistent notification, it will show your notifications. The permanent notification will be used for your service to run in the background.
#RequiresApi(Build.VERSION_CODES.O)
private fun createNotification() {
val intent = Intent(this, TabbedActivity::class.java).apply {
flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
}
val pendingIntent: PendingIntent =
PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_IMMUTABLE)
val notification = NotificationCompat.Builder(this, channelId)
.setSmallIcon(R.drawable.icon_child)
.setContentTitle("Hi $parent_name")
.setContentText(notificationText)
.setAutoCancel(true)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setContentIntent(pendingIntent)
with(NotificationManagerCompat.from(this)) {
notify(notifManagerId, notification.build())
notifManagerId++
}
parmanentNotification()
}
this is a permanent notification will not be lost and destroyed will keep the service running permanently
private fun parmanentNotification() {
val notification=NotificationCompat.Builder(this,channelId)
.setSmallIcon(R.drawable.icon_child)
.setContentTitle("Hi $parent_name")
.setContentText("Application service running in the background")
.build()
startForeground(1,notification)
}

you aren't creating a common Notification in this scenario, you are running a Service, which must have a foreground representation on screen. So Activity visible or sticked, fixed Notification, and you are showing it
Now you can have much Notifications using similar code, but don't show them using startForeground, instead use NotificationManager, preferably compat version
NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this);
notificationManager.notify(uniqueId, notification);
or just like you are using it already when creating channel inside if: (getSystemService(NOTIFICATION_SERVICE) as NotificationManager).notify(...)
foreground-related Notification is sticky and lives as long as Service works in background, they are "tied". other Notifications may be configured to be sticky or swipeable, also should be posted on some own Channel (per child? per action?). Note that if you show yet another sticky Notification then you have to release it by own through code, just killing Service won't dismiss it as it does with foreground-related Notification
some DOC in here, read carefully, all answers are there

How to dismiss all desired notifications on Android?

I'm creating a chat app that sends and receives notifications through Firebase Cloud Functions. Let's suppose I have 2 friends, and each friend sends me 5 messages(5 notifications). When I open a chat in my chat list, I want all notifications for that chat to be dismissed and the others not.
Currently I can only dimiss 1 notification. If I get more than one notification the notificationManager.cancel(notificationId) doesn't work. I don't want to use notificationManager.cancelAll() as I just want to dismiss some notifications.
override fun onMessageReceived(remoteMessage: RemoteMessage) {
remoteMessage.notification.let { notification ->
val type = remoteMessage.data[NOTIFICATION_TYPE]
val notificationChannelId = getNotificationChannelId(type)
val soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
val intent = Intent(this, HomeActivity::class.java)
val notificationIntent = setIntent(remoteMessage.data)
val stackBuilder: TaskStackBuilder = TaskStackBuilder.create(this)
stackBuilder.addParentStack(HomeActivity::class.java)
stackBuilder.addNextIntent(intent)
stackBuilder.addNextIntent(notificationIntent)
val pendingIntent: PendingIntent =
stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT)
val notificationManager =
getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
val notificationBuilder = NotificationCompat.Builder(this, notificationChannelId)
.setContentTitle(notification?.title ?: "")
.setContentText(notification?.body ?: "")
.setStyle(
NotificationCompat.BigTextStyle()
.bigText(notification?.body ?: "")
)
.setSmallIcon(R.drawable.ic_stat)
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.setSound(soundUri)
.setColor(ContextCompat.getColor(applicationContext, R.color.colorNotification))
.setVibrate(vibrationPattern)
.setContentIntent(pendingIntent)
.setAutoCancel(true)
notify(remoteMessage.data, notificationManager, notificationBuilder)
}
}
private fun notify(
data: Map<String, String>,
notificationManager: NotificationManager,
notificationBuilder: NotificationCompat.Builder
) {
when (data[NOTIFICATION_TYPE]) {
CHAT_MSG -> {
if (data[NotificationUtils.CHAT_ID] != ChatActivity.currentChat) {
notificationManager.notify(
CHAT_MSG_NOTIFICATION_ID,
notificationBuilder.build()
)
}
}
FRIEND_REQUEST -> {
notificationManager.notify(
FRIEND_REQUEST_NOTIFICATION_ID,
notificationBuilder.build()
)
}
}
}
OnStart():
fun dismissNotifications(notificationId: Int) {
val notificationManager =
getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
notificationManager.cancel(notificationId)
}

My thoughts is:
Save all notificationIds in map where:
key is userName/userId in message.
value is List of notificationId
When you need to clear all notifications you just ask you map and clear all that notificationIds for that userName/userId

Notification works in Activity but not in Service

I am trying to integrate Firebase Cloud Messages into my app. The code I used in the showNotification function is from the Android User Interface Samples. I tried it in the Activity and it worked but am not sure why it's not working in the service. The println is showing the function is getting called and values are coming as expected. Is there anything am missing from the function?
class MessagingService : FirebaseMessagingService() {
override fun onMessageReceived(remoteMessage: RemoteMessage) {
if (remoteMessage.data.isNotEmpty()) {
val message = Gson().fromJson(remoteMessage.data.toString(), Message.Res::class.java).payload!!
showNotification(message.title, message.body, message.count)
}
}
private fun showNotification(title: String?, body: String?, count: Int = 0) {
println("_print::showNotification(title:$title, body:$body, count:$count)")
val mainPendingIntent = PendingIntent.getActivity(
applicationContext, BuildConfig.REQUEST_CODE,
Intent(applicationContext, MainActivity::class.java),
PendingIntent.FLAG_UPDATE_CURRENT
)
val builder = NotificationCompat.Builder(applicationContext, "channel_email_1")
.setContentTitle(title)
.setContentText(body)
.setSmallIcon(R.mipmap.ic_launcher)
.setLargeIcon(BitmapFactory.decodeResource(resources, R.mipmap.ic_launcher_round))
.setContentIntent(mainPendingIntent)
.setDefaults(NotificationCompat.DEFAULT_ALL)
.setColor(ContextCompat.getColor(applicationContext, R.color.primary))
.setSubText(if (count > 1) "You have $count pending notifications" else title)
.setCategory(Notification.CATEGORY_EMAIL)
.setPriority(1)
.setVisibility(NotificationCompat.VISIBILITY_PRIVATE)
NotificationManagerCompat.from(applicationContext)
.notify(BuildConfig.NOTIFICATION_ID, builder.build())
}
}

Instead of
val mainPendingIntent = PendingIntent.getActivity(
applicationContext, BuildConfig.REQUEST_CODE,
Intent(applicationContext, MainActivity::class.java),
PendingIntent.FLAG_UPDATE_CURRENT
)
NotificationManagerCompat.from(applicationContext)
.notify(BuildConfig.NOTIFICATION_ID, builder.build())
I use:
val notificationManager =
getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
// Since android Oreo notification channel is needed.
setupChannels(notificationManager, builder)
// Create pending intent, mention the Activity which needs to be triggered
// when user clicks on notification.
val notificationId = Random.nextInt()
navigateToScreen(builder, notificationId)
val notification = builder.build()
notificationManager.notify(notificationId, notification)
}
private fun setupChannels(notificationManager: NotificationManager,
builder: NotificationCompat.Builder) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val channelId = "channel_email_1"
val channel = NotificationChannel(channelId, "title",
NotificationManager.IMPORTANCE_DEFAULT).apply {
description = "body"
// Add other settings.
lockscreenVisibility = Notification.VISIBILITY_PUBLIC
canShowBadge()
setShowBadge(true)
}
notificationManager.createNotificationChannel(channel)
builder.setChannelId(channelId)
}
}
private fun navigateToScreen(builder: NotificationCompat.Builder,
notificationId: Int) {
val intent = Intent(this, MainActivity::class.java)
val pendingIntent = PendingIntent.getActivity(this, notificationId, intent,
PendingIntent.FLAG_UPDATE_CURRENT)
builder.setContentIntent(pendingIntent)
}

How to send fcm notification when app is not running

I have tried many solutions but none of them are worked. I am able receive FCM notification when app is active, but not getting notification when app is background or killed.

you need to create a service class extending FirebaseMessagingService and override onMessageReceived method in that class to send notification
class MyFirebaseMessagingService : FirebaseMessagingService() {
override fun onMessageReceived(message: RemoteMessage) {
super.onMessageReceived(message)
try {
message.notification?.let {
showNotification(
it.title ?: "",
it.body ?: ""
)
}
} catch (e: Exception) {
e.printStackTrace()
}
}
}
you are now getting the notification info from backend and showing it as a notification by using the function showNotification. of course, you must implement the function showNotification. it just a simple function for showing notifications in android
Edit: this the implementation of the function, add this to your class
class MyFirebaseMessagingService : FirebaseMessagingService() {
companion object {
const val channelId = "Channel"
const val channelName = "MyChannel"
const val smallIcon: Int = R.drawable.ic_logo
const val notificationId = 1
}
fun showNotification(myTitle: String, myBody: String) {
val notificationBuilder = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
Notification.Builder(applicationContext, channelId)
} else {
Notification.Builder(applicationContext)
}
val intent = Intent(applicationContext, HomeActivity::class.java)
val pendingIntent = PendingIntent.getActivity(
applicationContext,
0,
intent,
PendingIntent.FLAG_UPDATE_CURRENT
)
val notificationManager =
applicationContext.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
when {
Build.VERSION.SDK_INT >= 26 -> {
val channel = NotificationChannel(
channelId,
channelName,
NotificationManager.IMPORTANCE_DEFAULT
)
notificationManager.createNotificationChannel(channel)
notificationBuilder
.setContentIntent(pendingIntent)
.setContentText(myBody)
.setSmallIcon(smallIcon)
.setContentTitle(myTitle)
}
Build.VERSION.SDK_INT >= 24 -> notificationBuilder
.setContentText(myBody)
.setContentTitle(myTitle)
.setSmallIcon(smallIcon)
.setContentIntent(pendingIntent)
else -> notificationBuilder
.setContentText(myBody)
.setContentTitle(myTitle)
.setSmallIcon(smallIcon)
.setContentIntent(pendingIntent)
}
notificationManager.notify(notificationId, notificationBuilder.build())
}
}

If you want to get notification when app is background or killed your json object has to be this like:
{
"data":{
"title" : "your_title",
"body" : "your_body"
},
"to": "device_token",
"priority": "high"
}
You can catch notification onMessageReceived

Android: Service doesn't work after screen is off

I am trying to create service which will be fetch data from server (periodicaly) and send notification to user. I achieved almost my goal, but service stops work when screen is off. When I turn on my phone I get plenty of notifications from previous time.
Service code:
class MyService: Service() {
override fun onCreate() {
super.onCreate()
val handler = Handler()
val runnable = object: Runnable {
override fun run() {
getDataFromServer()
handler.postDelayed(this, 1800000)
}
}
handler.post(runnable)
}
private fun getDataFromServer() {
// fetch data
displayNotification(description)
}
private fun displayNotification(description: String) {
val intent = Intent(this, MainActivity::class.java)
val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
val notificationId = (0..300).random()
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val adminChannelName = "Messages channel"
val adminChannelDescription = "Notification about new data"
NotificationChannel(ADMIN_CHANNEL_ID, adminChannelName, NotificationManager.IMPORTANCE_HIGH).apply {
description = adminChannelDescription
enableLights(true)
lightColor = Color.RED
enableVibration(true)
notificationManager.createNotificationChannel(this)
}
}
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
val pendingIntent = PendingIntent.getActivity(
this, 0, intent, PendingIntent.FLAG_ONE_SHOT
)
val notificationSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
val notificationBuilder = NotificationCompat.Builder(this, ADMIN_CHANNEL_ID)
.setSmallIcon(R.drawable.icon_small)
.setContentTitle(getText(R.string.notification_new_data_title))
.setContentText(getString(R.string.notification_new_data_text, description))
.setAutoCancel(true)
.setSound(notificationSoundUri)
.setContentIntent(pendingIntent)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
notificationBuilder.color = ContextCompat.getColor(context, R.color.icon_background)
}
notificationManager.notify(notificationId, notificationBuilder.build())
}
override fun onBind(intent: Intent): IBinder ? {
return null
}
}
Thank you for your help!

Try to start you service using the startForegroundService instead of startService, whether you need a background service, you can convert you Service to JobIntentService:
https://developer.android.com/reference/androidx/core/app/JobIntentService