MainActivity.kt
package com.cfsuman.kotlintutorials
import android.app.*
import android.content.Context
import android.graphics.drawable.Icon
import android.os.Build
import android.os.Bundle
import android.widget.Button
import androidx.core.app.NotificationCompat
import androidx.core.app.NotificationManagerCompat
class MainActivity : Activity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// get the context
val context = this
// get the widgets reference from XML layout
val button = findViewById<Button>(R.id.button)
// Create and register notification channel api 26+
val channelId = "My_Channel_ID"
val notificationId = 1
createNotificationChannel(channelId)
// button click listener
button.setOnClickListener{
if (Build.VERSION.SDK_INT>=28) {
val builder = Notification
.Builder(context,channelId)
.setContentTitle("This is title")
.setContentText("This is content description")
.setSmallIcon(R.drawable.ic_action_help)
// Person added in API level 28
val jenny = Person.Builder()
.setIcon(Icon.createWithResource(
context,R.drawable.ic_action_edit))
.setName("Jenny")
.build()
val faria = Person.Builder()
.setIcon(Icon.createWithResource(
context,R.drawable.ic_action_backup))
.setName("Faria")
.build()
// Notification.MessagingStyle added in API level 24
builder.style = Notification.MessagingStyle(jenny)
.addMessage("Hi! how are you?",
System.currentTimeMillis()-60000,jenny)
.addMessage("I Am fine",
System.currentTimeMillis()-30000,faria)
.addMessage("Good.",
System.currentTimeMillis(),jenny)
.setGroupConversation(true)
with(NotificationManagerCompat.from(context)){
notify(notificationId, builder.build())
}
}else{
val builder = NotificationCompat
.Builder(context,channelId)
.setContentTitle("This is title")
.setContentText("This is content description")
.setSmallIcon(R.drawable.ic_action_help)
builder.setStyle(NotificationCompat
.MessagingStyle("jenny")
.addMessage("Hi! how are you?",
System.currentTimeMillis()-60000,"Jenny")
.addMessage("I Am fine",
System.currentTimeMillis()-30000,"Faria")
.addMessage("Good.",
System.currentTimeMillis(),"Jenny")
.setGroupConversation(true)
)
with(NotificationManagerCompat.from(context)){
notify(notificationId, builder.build())
}
}
}
}
// create notification channel
private fun createNotificationChannel(channelId:String) {
// Create the NotificationChannel,
// but only on API 26+ (Android 8.0) because
// the NotificationChannel class is new and
// not in the support library
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
val name = "My Channel"
val channelDescription = "Channel Description"
val importance = NotificationManager.IMPORTANCE_DEFAULT
val channel = NotificationChannel(channelId,name,importance)
channel.apply {
description = channelDescription
}
// Finally register the channel with system
val notificationManager = getSystemService(
Context.NOTIFICATION_SERVICE) as NotificationManager
notificationManager.createNotificationChannel(channel)
}
}
}
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"
android:background="#DCDCDC"
android:id="@+id/rootLayout"
android:padding="24dp">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show Notification"
android:textAllCaps="false"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
AndroidManifest.xml [Permission]
<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
