MainActivity.kt
package com.cfsuman.kotlintutorials
import android.app.Activity
import android.app.NotificationChannel
import android.app.NotificationManager
import android.content.Context
import android.graphics.BitmapFactory
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{
val notificationBuilder = NotificationCompat
.Builder(context,channelId)
.setSmallIcon(R.drawable.ic_action_help)
.setContentTitle("Title: API LEVEL " + Build.VERSION.SDK_INT)
.setContentText("Notification content text.")
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.setStyle(
NotificationCompat.BigPictureStyle()
// Provide the bitmap to be used as the
// payload for the BigPicture notification.
.bigPicture(BitmapFactory.decodeResource(
resources,R.drawable.flowers))
// Override the large icon when the
// big notification is shown.
.bigLargeIcon(BitmapFactory.decodeResource(
resources,R.drawable.flowers))
// Overrides ContentTitle in the
// big form of the template.
.setBigContentTitle("Beautiful Flower")
// Set the first line of text after the detail
// section in the big form of the template.
.setSummaryText("This is big picture summary")
)
with(NotificationManagerCompat.from(context)){
notify(notificationId, notificationBuilder.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" />
