What is Android progress notifications in Kotlin?

In this article, we will learn Android progress notifications in Kotlin,This free Kotlin tutorial for complete beginners will help you learn Kotlin from scratch.

Android progress notifications in Kotlin

Android Menus

Android Project folder Structure

(Indeterminate progress indicator and Fixed-duration progress indicator)

Small Icon – Required, can be set with setSmallIcon().
Application Name – Provided by the system.
Time Stamp – Provided by the system but can be overridden.
Large Icon – Optional, can be set with setLargeIcon().
Title – Optional, can be set with setContentTitle().
Text – Optional, can be set with setContentText().

Note : Notification Channels

App.kt

package com.gfg.progressnotificationdemo 
   
import android.app.Application 
import android.app.NotificationChannel 
import android.app.NotificationManager 
import android.os.Build 
   
class App : Application(){ 
    val channelId = "Progress Notification" as String 
   
    override fun onCreate(){ 
        super.onCreate() 
        createNotificationChannels() 
    } 
       
    //Check if the Android version is greater than 8. (Android Oreo) 
    private fun createNotificationChannels(){ 
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { 
            val channel1 = NotificationChannel( 
                channelId, 
                "Progress Notification", 
    //IMPORTANCE_HIGH = shows a notification as peek notification. 
    //IMPORTANCE_LOW = shows the notification in the status bar. 
                NotificationManager.IMPORTANCE_HIGH 
            ) 
            channel1.description = "Progress Notification Channel"
            val manager = getSystemService( 
                NotificationManager::class.java 
            ) 
            manager.createNotificationChannel(channel1) 
        } 
    } 
} 

MainActivity.kt

package com.gfg.progressnotificationdemo 
   
import android.app.PendingIntent 
import android.content.Intent 
import android.os.Bundle 
import android.os.SystemClock 
import android.view.View 
import androidx.appcompat.app.AppCompatActivity 
import androidx.core.app.NotificationCompat 
import androidx.core.app.NotificationManagerCompat 
import com.gfg.progressnotificationdemo.R.drawable 
   
   
class MainActivity : AppCompatActivity(){ 
   
    private lateinit var notificationManager: NotificationManagerCompat 
    val channelId = "Progress Notification" as String 
   
    override fun onCreate(savedInstanceState: Bundle?){ 
        super.onCreate(savedInstanceState) 
        setContentView(R.layout.activity_main) 
   
    //Create a Notification Manager 
        notificationManager = NotificationManagerCompat.from(this) 
   
    } 
   
    //Start() is called when the buttons is pressed. 
    public fun start(view: View){ 
   
        val intent = Intent(this, MainActivity::class.java).apply{ 
            flags = Intent.FLAG_ACTIVITY_NEW_TASK or  
            Intent.FLAG_ACTIVITY_CLEAR_TASK 
        } 
   
        val pendingIntent: PendingIntent = PendingIntent.getActivity( 
         this, 0, intent, 0) 
   
    //Sets the maximum progress as 100 
        val progressMax = 100
    //Creating a notification and setting its various attributes 
        val notification = 
            NotificationCompat.Builder(this, channelId) 
                .setSmallIcon(drawable.ic_file_download) 
                .setContentTitle("w3wiki") 
                .setContentText("Downloading") 
                .setPriority(NotificationCompat.PRIORITY_LOW) 
                .setOngoing(true) 
                .setOnlyAlertOnce(true) 
                .setProgress(progressMax, 0, true) 
                .setContentIntent(pendingIntent) 
                .setAutoCancel(true) 
   
    //Initial Alert 
        notificationManager.notify(1, notification.build()) 
   
        Thread(Runnable{ 
            SystemClock.sleep(2000) 
            var progress = 0
            while (progress <= progressMax) { 
                SystemClock.sleep( 
                    1000
                ) 
                progress += 20
    //Use this to make it a Fixed-duration progress indicator notification 
   
    //notification.setContentText(progress.toString()+"%") 
    //.setProgress(progressMax, progress, false) 
   
    //notificationManager.notify(1, notification.build()) 
            } 
      
            notification.setContentText("Download complete") 
                .setProgress(0, 0, false) 
                .setOngoing(false) 
            notificationManager.notify(1, notification.build()) 
        }).start() 
    } 
} 

Activity Main.xml

<?xml version="1.0" encoding="utf-8"?> 
<androidx.constraintlayout.widget.ConstraintLayout  
    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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical"> 
   
    <Button 
        android:layout_width="wrap_content"
        android:layout_height="75dp"
        android:onClick="start"
        android:text="Show Notification"
        android:textSize="22sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" /> 
   
</androidx.constraintlayout.widget.ConstraintLayout> 