Notification Permission In Android/kotlin

notificationpermission

MainActivity.kt:

import android.Manifest
import android.app.NotificationChannel
import android.app.NotificationManager
import android.content.Context
import android.content.pm.PackageManager
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Button
import androidx.core.app.NotificationCompat

class MainActivity : AppCompatActivity() {

    private lateinit var button: Button

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        button = findViewById(R.id.button_send_notification)
        button.setOnClickListener {
            sendNotification()
        }
    }

    private fun sendNotification() {
        // Create a notification channel
        val channel = NotificationChannel(
            "my_channel",
            "My Notification Channel",
            NotificationManager.IMPORTANCE_DEFAULT
        )
        channel.description = "This is my notification channel"
        channel.setAllowBubbles(false)
        val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        notificationManager.createNotificationChannel(channel)

        // Request permission
        val permission = Manifest.permission.POST_NOTIFICATIONS
        val requestCode = 1
        requestPermissions(arrayOf(permission), requestCode)

        // Create notification
        val notificationBuilder = NotificationCompat.Builder(this, "my_channel")
            .setContentTitle("My Notification")
            .setContentText("This is my notification")
            .setSmallIcon(R.drawable.baseline_circle_notifications_24)

        // Send the notification
        val notificationManager1 = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
        notificationManager1.notify(1, notificationBuilder.build())
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)

        if (requestCode == 1 && grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            sendNotification()
        }
    }
}


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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">

    <Button
        android:id="@+id/button_send_notification"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:onClick="sendNotification"
        android:text="Send Notification"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>