android kotlin - Notification big picture style example

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" />
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