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

Can't silence notification on Android API29

Need to silence a notification that is shown by a foreground service. To silence the notification I have used many suggested solution from SO. But nothing seems to silence the annoying notification sound. It is silenced on SDK25. But on SDK 29 emulator it is not silenced. What can be the solution?
Code:
//service
override fun onBind(intent: Intent?): IBinder? {
return null
}
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
createNotificationChannel()
val notificationIntent = Intent(this, MainActivity::class.java)
val pendingIntent = PendingIntent.getActivity(
this,
0, notificationIntent, 0
)
val notification: Notification =
NotificationCompat.Builder(this, CHANNEL_ID)
.setContentTitle("app_name")
.setContentText("Updating database.")
.setSmallIcon(R.drawable.logo)
.setContentIntent(pendingIntent)
.build()
startForeground(1, notification)
thread() {
Thread.sleep(3000)
stopSelf()
}
return START_NOT_STICKY
}
override fun onDestroy() {
super.onDestroy()
}
private fun createNotificationChannel() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val name = SettingsHelper.KEY_NOTIFICATION_channel_name_service
val description = SettingsHelper.KEY_NOTIFICATION_CH_ID_SERVICE
val channel = NotificationChannel(
SettingsHelper.KEY_NOTIFICATION_CH_ID,
name,
NotificationManager.IMPORTANCE_NONE
)
channel.description = description
channel.setSound(null, null)
val manager = getSystemService(
NotificationManager::class.java
)
manager.createNotificationChannel(channel)
}
}

Could you use setSilent() from NotificationCompat.Builder
If true, silences this instance of the notification, regardless of the sounds or vibrations set on the notification or notification channel. If false, then the normal sound and vibration logic applies. Defaults to false.
Note, that if you are changing notification settings, I recommend you to uninstall and re-install the app everytime since it might not be updated the settings you set in the new run.

Disable service restart on button click

I start a foreground service that downloads a file when users click on a button. What happens now is when I click again on the button, the thread inside service starts second time and I see in a notification that progress is updated for both threads (jumps presentae between threads).
How can I prevent starting the second thread in case the first one is running, how can I prevent startService() or onStartCommand() is being called if the service is still running?
class ForegroundService : Service() {
private val CHANNEL_ID = "ForegroundService Kotlin"
companion object {
fun startService(context: Context, message: String) {
val startIntent = Intent(context, ForegroundService::class.java)
startIntent.putExtra("inputExtra", message)
ContextCompat.startForegroundService(context, startIntent)
}
fun stopService(context: Context) {
val stopIntent = Intent(context, ForegroundService::class.java)
context.stopService(stopIntent)
}
}
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
val input = intent?.getStringExtra("inputExtra")
createNotificationChannel()
val notificationIntent = Intent(this, MainActivity::class.java)
val pendingIntent = PendingIntent.getActivity(
this,
0, notificationIntent, 0
)
//start doing some work and update the notification
//when done calling stopSelf();
val notification = NotificationCompat.Builder(this, CHANNEL_ID)
.setContentTitle("Foreground Service Kotlin Example")
.setContentText(input)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentIntent(pendingIntent)
.build()
startForeground(1, notification)
return START_NOT_STICKY
}
override fun onBind(intent: Intent): IBinder? {
return null
}
private fun createNotificationChannel() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val serviceChannel = NotificationChannel(
CHANNEL_ID, "Foreground Service Channel",
NotificationManager.IMPORTANCE_DEFAULT
)
val manager = getSystemService(NotificationManager::class.java)
manager!!.createNotificationChannel(serviceChannel)
}
}
}
Calling
buttonGoNext.setOnClickListener {
val intent = Intent(this, DownloadActivity::class.java)
startActivity(intent)
}

In your startService function you want to check if this service is already running. If the service is already running, you could just early return. There is multiple SO threads already regarding the problem of how to find out if a service is already running.
To have a little more control over your background work, I would suggest you familiarize yourself with Android's WorkManager. You could create a unique OneTimeWorkRequest with a KEEP policy, that would solve the problem as well.
Also, you should seperate your responsibilities in your code a little better. Your ForegroundService class currently takes care of too many things at once. You create notification channels, show notifications and probably also want to take care of the behaviour you described. It is generally good practice to seperate those concerns and move them to different classes. This also makes it more testable.

Android Doze mode kills foregreound MediaPlayer service

I've been researching awhile about how to keep active a constantly running audio playback in the background (online radio). For last I made a foreground service for it and its works for the most phones, but not on Samsung Android P and above... (as this article show in the "Foreground service limitations" section: https://proandroiddev.com/android-foreground-service-restrictions-d3baa93b2f70)
I heard that there is a advanced tool for audio playback called ExoPlayer. Could this lib help me out?
I'v been tried these solutions:
ping google.com every 2 sec
request battery optimization ignoring
set wake lock for mediplayer with: setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK) (still in use)
Starting the service:
viewModel.isMusicControlServiceNeedToStart.observe(this, Observer {
if (it) {
val intent = Intent(this, MusicControlForegroundServiceImpl::class.java).apply { action = ACTION_SHOW_MUSIC_CONTROL }
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) startForegroundService(intent) else startService(intent)
} else {
stopService(Intent(this, MusicControlForegroundServiceImpl::class.java))
}
})
The service itself:
class MusicControlForegroundServiceImpl : Service(), KoinComponent {
private val notificationManager: NotificationManager by inject()
private val radioManager: RadioManager by inject()
private val context: Context by inject()
private val preferences: Preferences by inject()
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
if (intent != null && intent.action == ACTION_SHOW_MUSIC_CONTROL) {
val lastSelectedRadio = preferences.getJSON(Globals.LAST_SELECTED_RADIO_KEY, Radio::class.java)
?: return START_NOT_STICKY
val notification = notificationManager.createMediaControlNotificationIfNeeded(context, lastSelectedRadio)
startForeground(1, notification)
}
return START_NOT_STICKY
}
override fun onTaskRemoved(rootIntent: Intent?) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) startForegroundService(rootIntent) else startService(rootIntent)
super.onTaskRemoved(rootIntent)
}
override fun onDestroy() {
if (!notificationManager.musicControlServiceRestart) radioManager.release()
synchronized(MUSIC_CONTROL_SERVICE_LOCK) { notificationManager.musicControlServiceRestart = false }
synchronized(MEDIA_PLAYER_LOCK) { radioManager.lastPlayedMediaUrl = null }
stopForeground(true)
super.onDestroy()
}
override fun onBind(intent: Intent?): IBinder? = null
}
The notification creation:
override fun createMediaControlNotificationIfNeeded(context: Context, selectedRadio: Radio): Notification {
val resultIntent = Intent(context, RadioDetailActivity::class.java)
val resultPendingIntent: PendingIntent? = TaskStackBuilder.create(context).run {
addNextIntentWithParentStack(resultIntent)
getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT)
}
val playIntent = Intent(context, NotificationReceiver::class.java).apply {
putExtra(MusicState::class.java.name, MusicState.PLAY)
}
val pauseIntent = Intent(context, NotificationReceiver::class.java).apply {
putExtra(MusicState::class.java.name, MusicState.PAUSE)
}
val notificationManager = NotificationManagerCompat.from(context)
#Suppress("DEPRECATION") val builder = NotificationCompat.Builder(context, CHANNEL_ID)
.setSmallIcon(R.drawable.ic_notification_icon)
.setContentTitle(selectedRadio.name)
.setDefaults(0)
.setOngoing(true)
.setNotificationSilent()
.addAction(
R.drawable.ic_notification_pause,
context.getString(R.string.pause),
PendingIntent.getBroadcast(context, 1, pauseIntent, 0)
)
.addAction(
R.drawable.ic_notification_play,
context.getString(R.string.play),
PendingIntent.getBroadcast(context, 2, playIntent, 0)
)
.setStyle(
androidx.media.app.NotificationCompat.MediaStyle().setMediaSession(
MediaSessionCompat(
context,
RadioDetailActivity::class.java.name
).sessionToken
)
)
.setContentIntent(resultPendingIntent)
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
val channel = NotificationChannel(
CHANNEL_ID,
context.getString(R.string.app_name),
NotificationManager.IMPORTANCE_LOW
)
notificationManager.createNotificationChannel(channel)
builder.setChannelId(CHANNEL_ID)
}
return builder.build()
}
If you need any other resources please let me know and help if you can! I'm struggling with this problem for weeks now.. :(
UPDATE
Now I throw my media control notification in every 2 minutes to update previous, so the app can survive like 30 minutes on the affected phone, but still not a working solution...

Periodic Task in Background

I'm currently building an app that starts a session by sending a request to the backend. After that, the app has to send a heartbeat request every 4.5 minutes. If the app does not send a request to the backend after 4.5 minutes since the last successful request, the session will get terminated. The heartbeat request can be sent earlier which also means that the next heartbeat has to be sent 4.5 minutes after that request.
Once the user has started the session, he should be able to put the app to the background to use the device for other things.
I'm struggling with coming up with a solution that works with the background restrictions (doze mode, etc).
I'm currently running the app with a foreground service. But the requests stop after a couple of minutes if I don't use the device actively. I tried the WorkManager and the AlarmManager. But the requests keep getting delayed.
I played around with REQUEST_IGNORE_BATTERY_OPTIMIZATIONS and this seems to work but I don't want to use that approach since Google seems to really dislike apps using this permission.
I created a test app to play around with different approaches. Maybe I'm doing something completely wrong?
Service:
class MainService : Service() {
private lateinit var wakeLock: PowerManager.WakeLock
override fun onBind(intent: Intent?): IBinder? = null
override fun onCreate() {
super.onCreate()
if (Build.VERSION.SDK_INT >= 26) {
val appName = getString(R.string.app_name)
val channelName = "$appName channel name"
val channelImportance = NotificationManager.IMPORTANCE_HIGH
val channelDescription = "$appName channel description"
createNotificationChannel(this, NOTIFICATION_CHANNEL_ID, channelName, channelImportance, channelDescription)
}
val notification = createOngoingNotification(this, NOTIFICATION_REQUEST_CODE, R.mipmap.ic_launcher_round, "Content Text")
startForeground(1000, notification)
wakeLock = (getSystemService(Context.POWER_SERVICE) as PowerManager).run {
newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyApp::MyWakelockTag").apply {
acquire(1 * 60 * 60 * 1000L)
}
}
}
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
intent?.action?.let {
if (it == "Heartbeat") {
val v = getSystemService(Context.VIBRATOR_SERVICE) as Vibrator
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
v.vibrate(VibrationEffect.createOneShot(500, VibrationEffect.DEFAULT_AMPLITUDE))
}
}
}
setNext()
return START_STICKY
}
private fun setNext() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
val intent = Intent(applicationContext, MainService::class.java)
intent.action = "Heartbeat"
val pendingIntent = PendingIntent.getService(applicationContext, REQUEST_CODE, intent, PendingIntent.FLAG_UPDATE_CURRENT)
val alarmManager = getSystemService(Context.ALARM_SERVICE) as AlarmManager
alarmManager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 5 * 1000, pendingIntent)
}
}
override fun onDestroy() {
stopForeground(true)
wakeLock.release()
super.onDestroy()
}
companion object {
const val REQUEST_CODE = 101
const val NOTIFICATION_REQUEST_CODE = 100
const val NOTIFICATION_CHANNEL_ID = "notification_channel_id"
fun createOngoingNotification(context: Context, requestCode: Int, icon: Int, text: String): Notification {
val contentIntent = Intent(context, MainActivity::class.java)
.setAction(Intent.ACTION_MAIN)
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK or Intent.FLAG_ACTIVITY_NEW_TASK)
val contentPendingIntent = PendingIntent.getActivity(context, requestCode, contentIntent, PendingIntent.FLAG_UPDATE_CURRENT)
return NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID)
.setOngoing(true)
.setSmallIcon(icon)
.setContentTitle("Test Notification")
.setContentText(text)
.setContentIntent(contentPendingIntent)
.build()
}
#RequiresApi(api = 26)
fun createNotificationChannel(context: Context,
id: String, name: String, importance: Int,
description: String) {
val channel = NotificationChannel(id, name, importance)
channel.description = description
val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
notificationManager.createNotificationChannel(channel)
}
}
}

I think that foreground service may be stopped as you are not executing anything inside it after you set the alarm. Foreground service keeps running if you are using it, so for making it work periodically i would put an observable that emits a value every 5 seconds for example. You only need the one emmited after 4.5 minutes but that will keep the foreground service active until you need it. Using rxjava:
Observable.intervalRange( 0 , 54, 0, 5, TimeUnit.SECONDS )
.doOnNext{
//You may not need this
}
.doOnComplete {
//heartbeat
//start this observable again for other 4.5 minutes
}
You will emit a value every 5 seconds 54 times. 54x5 = 270 seconds (what is 4.5 minutes)