Lavanyagaur22

 val icon = BitmapFactory.decodeResource(
                this.resources,
                R.drawable.ic_launcher_foreground
            )

            val not = NotificationCompat.Builder(this, "first")
                .setSmallIcon(R.drawable.ic_launcher_foreground)
                .setContentTitle("Hello There")
                .setContentText("General Kenobi!")
                .setLargeIcon(icon)

Lavanyagaur22

 val bigTextStyle = NotificationCompat.Builder(this, "first")
                .setSmallIcon(R.drawable.ic_launcher_foreground)
                .setContentTitle("Hello There")
                .setContentText("General Master!")
                .setStyle(
                    NotificationCompat.BigTextStyle()
                        .bigText(getString(R.string.big_string))
                )
                .setPriority(NotificationCompat.PRIORITY_DEFAULT).build()

Lavanyagaur22

           //Create a simple notification, first - > Channel ID
            val simpleNotification = NotificationCompat.Builder(this, "first")
                .setSmallIcon(R.drawable.ic_launcher_foreground)
                .setContentTitle("Hello There")
                .setContentText("General Master!")
                .setPriority(NotificationCompat.PRIORITY_DEFAULT).build()

            //Show the notification, nm is the NotificationManager object
            nm.notify(id, simpleNotification)

Lavanyagaur22

private fun createNotificationChannel() {
    // Create the NotificationChannel, but only on API 26+ because
    // the NotificationChannel class is new and not in the support library
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        val name = getString(R.string.channel_name) //name of the channel
        val descriptionText = getString(R.string.channel_description) 
        val importance = NotificationManager.IMPORTANCE_DEFAULT  //importance of the channel
        // Create a NotificationChannel
        val channel = NotificationChannel(CHANNEL_ID, name, importance).apply {
            description = descriptionText

Lavanyagaur22

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_gravity="center"
    android:gravity="center"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:context=".MainActivity">

Lavanyagaur22

import android.content.Context
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.core.content.edit
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {
    val KEY_DATA = "data"
    val KEY_APP_OPEN = "app_open"
    var appOpenCount = 0

Lavanyagaur22

        /*For scheduling a one time work request.
        */
        button.setOnClickListener {
            scheduleTask()
        }

Lavanyagaur22

    private fun scheduleRepeatingTasks() {

        /*Setting up different constraints on the work request.
         */
        val constraints = Constraints.Builder().apply {
            setRequiredNetworkType(NetworkType.CONNECTED)
            setRequiresCharging(true)
            setRequiresStorageNotLow(true)
        }.build()
        

Lavanyagaur22

 private fun scheduleTask() {
        // build an object of OneTimeWorkRequestBuilder
        val workerRequest = OneTimeWorkRequestBuilder<NotificationRequestWorker>()
            .setInitialDelay(20, TimeUnit.SECONDS)
            .build()
        // Enqueue the above workrequest object to the WorkManager
        WorkManager.getInstance(this).enqueue(workerRequest)
    }

Lavanyagaur22

// NotificationRequestWorker extends the worker class which defines the work to be performed by the worker.
class NotificationRequestWorker(val context: Context, workerParameters: WorkerParameters) :
    Worker(context, workerParameters) {
    override fun doWork(): Result {
        // Do the work here
        val nm = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        val notification = NotificationCompat.Builder(context, "first").apply {
            setContentTitle("Background task")
            setContentText("Sample text")
            setSmallIcon(R.drawable.ic_launcher_foreground)