Kotlin - Android notification in kotlin | Android MVP in Kotlin

Hello Friends,
       Lets first tell you what is notification.

Notification is a message that is used to display some short messages outside of our main application. Even if the app is not running, notifications will still work. Notifications have the following contents: an icon, title of notification and some text content.

Now today I am going to share , how create notification in Kotlin.

	<?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">
	<Button
	android:id="@+id/btn_send_notification"
	android:layout_width="wrap_content"
	android:layout_height="wrap_content"
	android:text="@string/text_send_notification"
	app:layout_constraintBottom_toBottomOf="parent"
	app:layout_constraintLeft_toLeftOf="parent"
	app:layout_constraintRight_toRightOf="parent"
	app:layout_constraintTop_toTopOf="parent" />
	</androidx.constraintlayout.widget.ConstraintLayout>

view raw activity_main.xml hosted with ❤ by GitHub

	<?xml version="1.0" encoding="utf-8"?>
	<manifest xmlns:android="http://schemas.android.com/apk/res/android"
	package="com.android.developer.soulutions.notification">
	<application
	android:allowBackup="true"
	android:icon="@mipmap/ic_launcher"
	android:label="@string/app_name"
	android:roundIcon="@mipmap/ic_launcher_round"
	android:supportsRtl="true"
	android:theme="@style/AppTheme">
	<activity android:name=".NotificationActivity"></activity>
	<activity android:name=".MainActivity">
	<intent-filter>
	<action android:name="android.intent.action.MAIN" />
	<category android:name="android.intent.category.LAUNCHER" />
	</intent-filter>
	</activity>
	</application>
	</manifest>

view raw Androidmanifest.xml hosted with ❤ by GitHub

	package com.android.developer.soulutions.notification
	import android.app.Notification
	import android.app.NotificationChannel
	import android.app.NotificationManager
	import android.app.PendingIntent
	import android.content.Context
	import android.content.Intent
	import android.graphics.BitmapFactory
	import android.graphics.Color
	import android.os.Build
	import androidx.appcompat.app.AppCompatActivity
	import android.os.Bundle
	import android.widget.RemoteViews
	import kotlinx.android.synthetic.main.activity_main.*
	class MainActivity : AppCompatActivity(), MainActivityContract.View {
	lateinit var notificationChannel: NotificationChannel
	lateinit var notificationManager: NotificationManager
	lateinit var builder: Notification.Builder
	private lateinit var presenter: MainActivityContract.Presenter
	private val channelId = "chanelId 1"
	private val description = "Hi android devloper solutions,hi mukesh"
	override fun onCreate(savedInstanceState: Bundle?) {
	super.onCreate(savedInstanceState)
	setContentView(R.layout.activity_main)
	MainAcivityPresenter(this)
	initView()
	}
	private fun initView() {
	btn_send_notification.setOnClickListener {
	//it is a class to notify the user of events that happen.
	// This is how you tell the user that something has happened in the
	notificationManager =
	getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
	presenter.onNotificationBtnClicked()
	}
	}
	override fun setPresenter(presenter: MainActivityContract.Presenter) {
	this.presenter = presenter
	}
	override fun createAndNotify() {
	val intent = Intent(this,NotificationActivity::class.java)
	val pendingIntent = PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_UPDATE_CURRENT)
	//RemoteViews are used to use the content of
	// some different layout apart from the current activity layout
	val contentView = RemoteViews(packageName,R.layout.activity_notification)
	//checking if android version is greater than oreo(API 26) or not
	if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
	notificationChannel = NotificationChannel(
	channelId,description,NotificationManager.IMPORTANCE_HIGH)
	notificationChannel.enableLights(true)
	notificationChannel.lightColor = Color.GREEN
	notificationChannel.enableVibration(false)
	notificationManager.createNotificationChannel(notificationChannel)
	builder = Notification.Builder(this,channelId)
	.setContentTitle("Notifications Example") //set title of notification
	.setContentText("This is a notification message")//this is notification message
	.setAutoCancel(true)
	.setSmallIcon(R.drawable.ic_launcher_background)
	.setLargeIcon(
	BitmapFactory.decodeResource(this.resources,
	R.drawable.ic_launcher_background))
	.setContentIntent(pendingIntent)
	}else{
	builder = Notification.Builder(this)
	.setContentTitle("Notifications Example") //set title of notification
	.setContentText("This is a notification message")//this is notification message
	.setAutoCancel(true)
	.setSmallIcon(R.drawable.ic_launcher_background)
	.setLargeIcon(BitmapFactory.decodeResource(this.resources,
	R.drawable.ic_launcher_background))
	.setContentIntent(pendingIntent)
	}
	notificationManager.notify(1234,builder.build())
	}
	}

view raw MainActivity.kt hosted with ❤ by GitHub

	package com.android.developer.soulutions.notification
	/**
	* Created by Mukesh on 5/10/2020.
	*/
	interface MainActivityContract {
	interface View {
	fun setPresenter(presenter: Presenter)
	fun createAndNotify()
	}
	interface Presenter {
	fun start()
	fun onNotificationBtnClicked()
	}
	}

view raw MainActivityContract.kt hosted with ❤ by GitHub

	package com.android.developer.soulutions.notification
	/**
	* Created by Mukesh on 5/10/2020.
	* mukesh.yadav
	*/
	class MainActivityPresenter(private val view: MainActivityContract.View) : MainActivityContract.Presenter {
	init {
	start()
	}
	override fun start() {
	view.setPresenter(this)
	}
	override fun onNotificationBtnClicked() {
	view.createAndNotify()
	}
	}

view raw MainActivityPresenter.kt hosted with ❤ by GitHub

Download code from here
Hope this will helps someone..
Enjoy Coding.... :)