Chitranshi Srivastava

Posted on Jun 12, 2021 • Updated on Jun 18, 2021

Creating Notifications in Android with Kotlin

STEPS

Create a Notification

NotificationUtils, EggTimerViewModel, EggTimerFragment

A Basic Notification

Implement an extension fun sendN in NotificationManager - to send Ns w/o rewriting the code

Create an extension fun to send messages
Create the content intent for the notification to launch this activity
Create PendingIntent
Set content intent
Cancel all notifications

Get an instance of NotificationCompat.Builder to build the notification
Set title, text and icon to the Builder
Call notify
Use the new notification channel

Add style
Add style to the Builder
Add snooze action

Set priority

// NotificationUtils.kt

package com.example.android.eggtimernotifications.util

import android.app.NotificationManager
import android.app.PendingIntent
import android.content.Context
import android.content.Intent
import android.graphics.BitmapFactory
import androidx.core.app.NotificationCompat
import com.example.android.eggtimernotifications.MainActivity
import com.example.android.eggtimernotifications.R
import com.example.android.eggtimernotifications.receiver.SnoozeReceiver

// Notification ID.
private val NOTIFICATION_ID = 0
private val REQUEST_CODE = 0
private val FLAGS = 0

// Step 1.1 extension function to send messages (GIVEN)
/**
 * Builds and delivers the notification.
 *
 * @param context, activity context.
 */
fun NotificationManager.sendNotification(messageBody: String, applicationContext: Context) {
    // Create the content intent for the notification, which launches
    // this activity
    // TODO: Step 1.11 create intent

    // TODO: Step 1.12 create PendingIntent

    // TODO: Step 2.0 add style

    // TODO: Step 2.2 add snooze action

    // TODO: Step 1.2 get an instance of NotificationCompat.Builder
    // Build the notification
    val builder = NotificationCompat.Builder(
        applicationContext,
        applicationContext.getString(R.string.egg_notification_channel_id)
    )

    // TODO: Step 1.8 use the new 'breakfast' notification channel

    // TODO: Step 1.3 set title, text and icon to builder
        .setSmallIcon(R.drawable.cooked_egg)
        .setContentTitle(applicationContext
            .getString(R.string.notification_title))
        .setContentText(messageBody)

    // TODO: Step 1.13 set content intent

        // TODO: Step 2.1 add style to builder

        // TODO: Step 2.3 add snooze action

        // TODO: Step 2.5 set priority

    // TODO: Step 1.4 call notify
    notify(NOTIFICATION_ID, builder.build())
}

// TODO: Step 1.14 Cancel all notifications

Get an instance of NotificationManager and call sendNotification

EggTimerViewModel

package com.example.android.eggtimernotifications.ui

import android.app.*
import android.content.Context
import android.content.Intent
import android.os.CountDownTimer
import android.os.SystemClock
import androidx.core.app.AlarmManagerCompat
import androidx.core.content.ContextCompat
import androidx.lifecycle.*
import com.example.android.eggtimernotifications.receiver.AlarmReceiver
import com.example.android.eggtimernotifications.R
import com.example.android.eggtimernotifications.util.sendNotification
import kotlinx.coroutines.*

class EggTimerViewModel(private val app: Application) : AndroidViewModel(app) {

    private val REQUEST_CODE = 0
    private val TRIGGER_TIME = "TRIGGER_AT"

    private val minute: Long = 60_000L
    private val second: Long = 1_000L

    private val timerLengthOptions: IntArray
    private val notifyPendingIntent: PendingIntent

    private val alarmManager = app.getSystemService(Context.ALARM_SERVICE) as AlarmManager
    private var prefs = app.getSharedPreferences(
                        "com.example.android.eggtimernotifications",
                        Context.MODE_PRIVATE
        )
    private val notifyIntent = Intent(app, AlarmReceiver::class.java)

    private val _timeSelection = MutableLiveData<Int>()
    val timeSelection: LiveData<Int>
        get() = _timeSelection

    private val _elapsedTime = MutableLiveData<Long>()
    val elapsedTime: LiveData<Long>
        get() = _elapsedTime

    private var _alarmOn = MutableLiveData<Boolean>()
    val isAlarmOn: LiveData<Boolean>
        get() = _alarmOn

    private lateinit var timer: CountDownTimer

    init {
        _alarmOn.value = PendingIntent.getBroadcast(
            getApplication(),
            REQUEST_CODE,
            notifyIntent,
            PendingIntent.FLAG_NO_CREATE
        ) != null

        notifyPendingIntent = PendingIntent.getBroadcast(
            getApplication(),
            REQUEST_CODE,
            notifyIntent,
            PendingIntent.FLAG_UPDATE_CURRENT
        )

        timerLengthOptions = app.resources.getIntArray(R.array.minutes_array)

        //If alarm is not null, resume the timer back for this alarm
        if (_alarmOn.value!!) {
            createTimer()
        }

    }

    /**
     * Turns on or off the alarm
     *
     * @param isChecked, alarm status to be set.
     */
    fun setAlarm(isChecked: Boolean) {
        when (isChecked) {
            true -> timeSelection.value?.let { startTimer(it) }
            false -> cancelNotification()
        }
    }

    /**
     * Sets the desired interval for the alarm
     *
     * @param timerLengthSelection, interval timerLengthSelection value.
     */
    fun setTimeSelected(timerLengthSelection: Int) {
        _timeSelection.value = timerLengthSelection
    }

    /**
     * Creates a new alarm, notification and timer
     */
    private fun startTimer(timerLengthSelection: Int) {
        _alarmOn.value?.let {
            if (!it) {
                _alarmOn.value = true
                val selectedInterval = when (timerLengthSelection) {
                    0 -> second * 10 //For testing only
                    else ->timerLengthOptions[timerLengthSelection] * minute
                }
                val triggerTime = SystemClock.elapsedRealtime() + selectedInterval

                // Step 1.5 get an instance of NotificationManager and call sendNotification
                val notificationManager = ContextCompat.getSystemService(                       
                    app,                                                                        
                    NotificationManager::class.java                                             
                ) as NotificationManager                                                        
                notificationManager.sendNotification(app.getString(R.string.timer_running), app)

                              // Step 1.15 call cancel notification

                AlarmManagerCompat.setExactAndAllowWhileIdle(
                    alarmManager,
                    AlarmManager.ELAPSED_REALTIME_WAKEUP,
                    triggerTime,
                    notifyPendingIntent
                )

                viewModelScope.launch {
                    saveTime(triggerTime)
                }
            }
        }
        createTimer()
    }

    /**
     * Creates a new timer
     */
    private fun createTimer() {
        viewModelScope.launch {
            val triggerTime = loadTime()
            timer = object : CountDownTimer(triggerTime, second) {
                override fun onTick(millisUntilFinished: Long) {
                    _elapsedTime.value = triggerTime - SystemClock.elapsedRealtime()
                    if (_elapsedTime.value!! <= 0) {
                        resetTimer()
                    }
                }

                override fun onFinish() {
                    resetTimer()
                }
            }
            timer.start()
        }
    }

    /**
     * Cancels the alarm, notification and resets the timer
     */
    private fun cancelNotification() {
        resetTimer()
        alarmManager.cancel(notifyPendingIntent)
    }

    /**
     * Resets the timer on screen and sets alarm value false
     */
    private fun resetTimer() {
        timer.cancel()
        _elapsedTime.value = 0
        _alarmOn.value = false
    }

    private suspend fun saveTime(triggerTime: Long) =
        withContext(Dispatchers.IO) {
            prefs.edit().putLong(TRIGGER_TIME, triggerTime).apply()
        }

    private suspend fun loadTime(): Long =
        withContext(Dispatchers.IO) {
            prefs.getLong(TRIGGER_TIME, 0)
        }
}

Notification Channels

Create an extension fun createChannel (& call it in onCreate)

Create a NotificationChannel instance - pass id, name & importance
On the NotificationChannel obj, set the props - enableLights, lightColor, enableVibration, channel description
Get an instance of NotificationManager by calling getSystemService
Call createNotificationChannel on NotificationManager and pass the NotificationChannel obj.
To create the channel, call this createChannel ext. fun in the onCreate fun.
NotificationUtils → build: verify the channel id you previously set is correct

Pull the status bar and observe the notification title, content and icon are just like you set in the previous steps.
To verify the newly created channel, close the app and find the app icon. Perform a long click on the app icon and select app info.

// EggTimerFragment.kt

package com.example.android.eggtimernotifications.ui

import android.app.NotificationChannel
import android.app.NotificationManager
import android.graphics.Color
import android.os.Build
import android.os.Bundle
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.databinding.DataBindingUtil
import androidx.fragment.app.Fragment
import androidx.lifecycle.ViewModelProvider
import com.example.android.eggtimernotifications.R
import com.example.android.eggtimernotifications.databinding.FragmentEggTimerBinding
import com.google.firebase.messaging.FirebaseMessaging

class EggTimerFragment : Fragment() {

    private val TOPIC = "breakfast"

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {

        val binding: FragmentEggTimerBinding = DataBindingUtil.inflate(
            inflater, R.layout.fragment_egg_timer, container, false
        )

        val viewModel = ViewModelProvider(this).get(EggTimerViewModel::class.java)

        binding.eggTimerViewModel = viewModel
        binding.lifecycleOwner = this.viewLifecycleOwner

        // Step 1.7 call create channel
        createChannel(
            getString(R.string.egg_notification_channel_id),
            getString(R.string.egg_notification_channel_name)
        )

        return binding.root
    }

    private fun createChannel(channelId: String, channelName: String) {
        // Step 1.6 START create a channel
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val notificationChannel = NotificationChannel(
                channelId,
                channelName,
                // Change importance
                NotificationManager.IMPORTANCE_LOW
            )

            notificationChannel.enableLights(true)
            notificationChannel.lightColor = Color.RED
            notificationChannel.enableVibration(true)
            notificationChannel.description = "Time for breakfast!"

            val notificationManager = requireActivity().getSystemService(
                NotificationManager::class.java
            )
            notificationManager.createNotificationChannel(notificationChannel)

        } else {
            Log.d(TAG, "VERSION.SDK_INT < O")
            Toast.makeText(context, "VERSION.SDK_INT < O", Toast.LENGTH_SHORT).show()
        }

        // Step 1.6 END create a channel

    }

    companion object {
        private const val TAG = "EggTimerFragment"
        fun newInstance() = EggTimerFragment()
    }
}

Add a New Notification

AlarmReceiver

Add Notifications to Your App

Create another notification using AlarmReceiver

Create an AlarmReceiver class that inherits BroadcastReceiver
Get an instance of NotificationManager by calling getSystemService & call sendNotification on it

package com.example.android.eggtimernotifications.receiver

import android.app.NotificationManager
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.widget.Toast
import androidx.core.content.ContextCompat
import com.example.android.eggtimernotifications.R
import com.example.android.eggtimernotifications.util.sendNotification

class AlarmReceiver: BroadcastReceiver() {

    override fun onReceive(context: Context, intent: Intent) {
        // Step 1.10 remove toast (since we're now sending a notification for the same)
        // Toast.makeText(context, context.getText(R.string.eggs_ready), Toast.LENGTH_SHORT).show()

        // TODO: Step 1.9 add call to sendNotification
        val notificationManager = ContextCompat.getSystemService(
            context,
            NotificationManager::class.java
        ) as NotificationManager

                notificationManager.sendNotification(
            context.getText(R.string.eggs_ready).toString(),
            context
        )

    }

}

Go Back to the App from the Notification using PendingIntent

NotificationUtils

Add a Content Intent

Navigate back to the app on tapping the notification

Create an intent
Create a pending intent
Pass the pending intent to the notification by calling setContentIntent on the NotificationBuilder
For the notification to dismiss itself as it takes you to the app when you tap on the it, set setAutoCancel to true

package com.example.android.eggtimernotifications.util

import android.app.NotificationManager
import android.app.PendingIntent
import android.content.Context
import android.content.Intent
import android.graphics.BitmapFactory
import androidx.core.app.NotificationCompat
import com.example.android.eggtimernotifications.MainActivity
import com.example.android.eggtimernotifications.R
import com.example.android.eggtimernotifications.receiver.SnoozeReceiver

// Notification ID.
private val NOTIFICATION_ID = 0
private val REQUEST_CODE = 0
private val FLAGS = 0

// Step 1.1 extension function to send messages (GIVEN)
/**
 * Builds and delivers the notification.
 *
 * @param context, activity context.
 */
fun NotificationManager.sendNotification(messageBody: String, applicationContext: Context) {
    // Create the content intent for the notification, which launches
    // this activity
    // Step 1.11 create intent
    val contentIntent = Intent(applicationContext, MainActivity::class.java)

    // Step 1.12 create PendingIntent
    val contentPendingIntent = PendingIntent.getActivity(
        applicationContext,
        NOTIFICATION_ID,
        contentIntent,
        PendingIntent.FLAG_UPDATE_CURRENT
    )

    // TODO: Step 2.0 add style

    // TODO: Step 2.2 add snooze action

    // Step 1.2 get an instance of NotificationCompat.Builder
    // Build the notification
    val builder = NotificationCompat.Builder(
        applicationContext,
        applicationContext.getString(R.string.egg_notification_channel_id)
    )

    // TODO: Step 1.8 use the new 'breakfast' notification channel

    // Step 1.3 set title, text and icon to builder
        .setSmallIcon(R.drawable.cooked_egg)
        .setContentTitle(applicationContext
            .getString(R.string.notification_title))
        .setContentText(messageBody)

    // Step 1.13 set content intent
        .setContentIntent(contentPendingIntent)
        .setAutoCancel(true)

        // TODO: Step 2.1 add style to builder

        // TODO: Step 2.3 add snooze action

        // TODO: Step 2.5 set priority

    // Step 1.4 call notify
    notify(NOTIFICATION_ID, builder.build())
}

// TODO: Step 1.14 Cancel all notifications

Clear the Previous Notifications using cancelAll

NotificationUtils, EggTimerViewModel

Cancel the Notification

Create an extension fun cancelNotifications
- Add an extension fun on NotificationManager that calls cancelAll
NotificationUtils
```
funNotificationManager.cancelNotifications() {
    cancelAll()
}
```
Call the extension fun cancelNotifications in startTimer fun

EggTimerViewModel
```
notificationManager.cancelNotifications()
```

Styling Your Notification

NotificationUtils

Style your Notification in BigPictureStyle

Load the image from resources using the BitmapFactory
Create a new BigPictureStyle bigPicStyle & set your image
For the large icon to go away when the notification is expanded, set the bigLargeIcon to null
Set the new style bigPicStyle to the NotificationBuilder
For the image to be displayed as a smaller icon when the notification is collapsed, set your image as setLargeIcon on the builder

package com.example.android.eggtimernotifications.util

import android.app.NotificationManager
import android.app.PendingIntent
import android.content.Context
import android.content.Intent
import android.graphics.BitmapFactory
import androidx.core.app.NotificationCompat
import com.example.android.eggtimernotifications.MainActivity
import com.example.android.eggtimernotifications.R
import com.example.android.eggtimernotifications.receiver.SnoozeReceiver

// Notification ID.
private const val NOTIFICATION_ID = 0
private const val REQUEST_CODE = 0
private const val FLAGS = 0

// Step 1.1 extension function to send messages (GIVEN)
/**
 * Builds and delivers the notification.
 *
 * @param context, activity context.
 */
fun NotificationManager.sendNotification(messageBody: String, applicationContext: Context) {
    // Create the content intent for the notification, which launches
    // this activity
    // Step 1.11 create intent
    val contentIntent = Intent(applicationContext, MainActivity::class.java)

    // Step 1.12 create PendingIntent
    val contentPendingIntent = PendingIntent.getActivity(
        applicationContext,
        NOTIFICATION_ID,
        contentIntent,
        PendingIntent.FLAG_UPDATE_CURRENT
    )

    // Step 2.0 add style
    val eggImage =  BitmapFactory.decodeResource(
            applicationContext.resources,
            R.drawable.cooked_egg
    )

    val bigPicStyle = NotificationCompat.BigPictureStyle()
            .bigPicture(eggImage)
            .bigLargeIcon(null)

    // TODO: Step 2.2 add snooze action

    // Step 1.2 get an instance of NotificationCompat.Builder
    // Build the notification
    val builder = NotificationCompat.Builder(
        applicationContext,
        applicationContext.getString(R.string.egg_notification_channel_id)
    )

    // TODO: Step 1.8 use the new 'breakfast' notification channel

    // Step 1.3 set title, text and icon to builder
        .setSmallIcon(R.drawable.cooked_egg)
        .setContentTitle(applicationContext
            .getString(R.string.notification_title))
        .setContentText(messageBody)

    // Step 1.13 set content intent
        .setContentIntent(contentPendingIntent)
        .setAutoCancel(true)

    // Step 2.1 add style to builder
            .setStyle(bigPicStyle)
            .setLargeIcon(eggImage)

    // TODO: Step 2.3 add snooze action

    // TODO: Step 2.5 set priority

    // TODO: Step 1.4 call notify
    notify(NOTIFICATION_ID, builder.build())
}

// Step 1.14 Cancel all notifications
fun NotificationManager.cancelNotifications() {
    cancelAll()
}

Add Snooze Action

SnoozeReceiver, NotificationUtils

Schedule a new notification & remove the snoozed one

Get an instance of NotificationManager

package com.example.android.eggtimernotifications.receiver

import android.app.AlarmManager
import android.app.NotificationManager
import android.app.PendingIntent
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.os.SystemClock
import android.text.format.DateUtils
import androidx.core.app.AlarmManagerCompat
import androidx.core.content.ContextCompat

class SnoozeReceiver: BroadcastReceiver() {
    private val REQUEST_CODE = 0

    override fun onReceive(context: Context, intent: Intent) {
        val triggerTime = SystemClock.elapsedRealtime() + DateUtils.MINUTE_IN_MILLIS

        val notifyIntent = Intent(context, AlarmReceiver::class.java)
        val notifyPendingIntent = PendingIntent.getBroadcast(
            context,
            REQUEST_CODE,
            notifyIntent,
            PendingIntent.FLAG_UPDATE_CURRENT
        )

        val alarmManager = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
        AlarmManagerCompat.setExactAndAllowWhileIdle(
            alarmManager,
            AlarmManager.ELAPSED_REALTIME_WAKEUP,
            triggerTime,
            notifyPendingIntent
        )

        val notificationManager = ContextCompat.getSystemService(
                context,
                NotificationManager::class.java
        ) as NotificationManager
        notificationManager.cancelAll()
    }

}

Set up a new alarm to post a new notification after 60 secs when the snooze button is tapped by the user by using a PendingIntent

Create intent
Create a PendingIntent
Call the addAction fun on the NotificationBuilder

package com.example.android.eggtimernotifications.util

import android.app.NotificationManager
import android.app.PendingIntent
import android.content.Context
import android.content.Intent
import android.graphics.BitmapFactory
import androidx.core.app.NotificationCompat
import com.example.android.eggtimernotifications.MainActivity
import com.example.android.eggtimernotifications.R
import com.example.android.eggtimernotifications.receiver.SnoozeReceiver

// Notification ID.
private const val NOTIFICATION_ID = 0
private const val REQUEST_CODE = 0
private const val FLAGS = 0

// Step 1.1 extension function to send messages (GIVEN)
/**
 * Builds and delivers the notification.
 *
 * @param context, activity context.
 */
fun NotificationManager.sendNotification(messageBody: String, applicationContext: Context) {
    // Create the content intent for the notification, which launches
    // this activity
    // Step 1.11 create intent
    val contentIntent = Intent(applicationContext, MainActivity::class.java)

    // Step 1.12 create PendingIntent
    val contentPendingIntent = PendingIntent.getActivity(
        applicationContext,
        NOTIFICATION_ID,
        contentIntent,
        PendingIntent.FLAG_UPDATE_CURRENT
    )

    // Step 2.0 add style
    val eggImage =  BitmapFactory.decodeResource(
            applicationContext.resources,
            R.drawable.cooked_egg
    )

    val bigPicStyle = NotificationCompat.BigPictureStyle()
            .bigPicture(eggImage)
            .bigLargeIcon(null)

    // Step 2.2 add snooze action
    val snoozeIntent = Intent(applicationContext, SnoozeReceiver::class.java)
    val snoozePendingIntent = PendingIntent.getBroadcast(
            applicationContext,
            REQUEST_CODE,
            snoozeIntent,
            FLAGS
    )

    // Step 1.2 get an instance of NotificationCompat.Builder
    // Build the notification
    val builder = NotificationCompat.Builder(
        applicationContext,
        applicationContext.getString(R.string.egg_notification_channel_id)
    )

    // TODO: Step 1.8 use the new 'breakfast' notification channel

    // Step 1.3 set title, text and icon to builder
        .setSmallIcon(R.drawable.cooked_egg)
        .setContentTitle(applicationContext
            .getString(R.string.notification_title))
        .setContentText(messageBody)

    // Step 1.13 set content intent
        .setContentIntent(contentPendingIntent)
        .setAutoCancel(true)

    // Step 2.1 add style to builder
            .setStyle(bigPicStyle)
            .setLargeIcon(eggImage)

    // Step 2.3 add snooze action
            .addAction(
                    R.drawable.egg_icon,
                    applicationContext.getString(R.string.snooze),
                    snoozePendingIntent
            )

    // TODO: Step 2.5 set priority

    // Step 1.4 call notify
    notify(NOTIFICATION_ID, builder.build())
}

// Step 1.14 Cancel all notifications
fun NotificationManager.cancelNotifications() {
    cancelAll()
}

Change Importance

EggTimerFragment, NotificationUtils

Set the picture

// NotificationUtils()

    // Step 2.0 add style
    val eggImage =  BitmapFactory.decodeResource(
            applicationContext.resources,
            R.drawable.cooked_egg
    )

    val bigPicStyle = NotificationCompat.BigPictureStyle()
            .bigPicture(eggImage)
            .bigLargeIcon(null)

**********************************************************************************

    val builder = NotificationCompat.Builder(
        applicationContext,
        applicationContext.getString(R.string.egg_notification_channel_id)
    )
                        ...
    // Step 2.1 add style to builder
            .setStyle(bigPicStyle)
            .setLargeIcon(eggImage)

Change importance from low to high

NotificationManager → IMPORTANCE

...

class EggTimerFragment : Fragment() {

    ...

    private fun createChannel(channelId: String, channelName: String) {
        // Step 1.6 START create a channel
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val notificationChannel = NotificationChannel(
                channelId,
                channelName,
                // Change importance
                NotificationManager.IMPORTANCE_HIGH
            )

            notificationChannel.enableLights(true)
            notificationChannel.lightColor = Color.RED
            notificationChannel.enableVibration(true)
            notificationChannel.description = "Time for breakfast!"

            val notificationManager = requireActivity().getSystemService(
                NotificationManager::class.java
            )
            notificationManager.createNotificationChannel(notificationChannel)

        } else {
            Log.d(TAG, "VERSION.SDK_INT < O")
            Toast.makeText(context, "VERSION.SDK_INT < O", Toast.LENGTH_SHORT).show()
        }

        // Step 1.6 END create a channel

    }

    ...
}

Add PRIORITY_HIGH to notification builder object

To support devices running API level 25 or lower, you must call setPriority for each notification, using a constant from the NotificationCompat class. To fix this, we're doing the above.

// *NotificationUtils.kt*

fun NotificationManager.sendNotification(messageBody: String, applicationContext: Context) {
    ...

    // Step 1.2 get an instance of NotificationCompat.Builder
    // Build the notification
    val builder = NotificationCompat.Builder(
        applicationContext,
        applicationContext.getString(R.string.egg_notification_channel_id)
    )

    ...

    // Step 2.5 set priority
            .setPriority(NotificationCompat.PRIORITY_HIGH)

      ...
}

...

Notification Badges

EggTimerFragment

Disable badge

Set setShowBadge to false on the NotificationChannel obj.

// *EggTimerFragment.kt*

private fun createChannel(channelId: String, channelName: String) {
        // Step 1.6 START create a channel
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            val notificationChannel = NotificationChannel(
                channelId,
                channelName,
                // Change importance
                NotificationManager.IMPORTANCE_HIGH
            )
            // Step 2.6 Disable badges for this channel
                    .apply {
                        setShowBadge(false)
                    }
                        ...
                }
}

DEV Community

Creating Notifications in Android with Kotlin

STEPS

Create a Notification

Add a New Notification

Go Back to the App from the Notification using PendingIntent

Clear the Previous Notifications using cancelAll

Styling Your Notification

Add Snooze Action

Change Importance

Notification Badges

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