Step 4 : Foreground service : NotificationHelper

NotificationHelper.kt

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.os.Build
import androidx.annotation.RequiresApi
import androidx.core.app.NotificationCompat
import com.alokomkar.activity.HomeActivity
import com.alokomkar.javacollections.R

class NotificationHelper(private val context: Context) {

    private val notificationBuilder: NotificationCompat.Builder by lazy {
        NotificationCompat.Builder(context, CHANNEL_ID)
            .setContentTitle(context.getString(R.string.notification_title))
            .setContentText(context.getString(R.string.notification_message))
            .setTicker(context.getString(R.string.ticker_text))
            .setSound(null)
            .setContentIntent(contentIntent)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setPriority(NotificationCompat.PRIORITY_HIGH)
            .setAutoCancel(true)
    }

    private val notificationManager by lazy {
        context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
    }

    private val contentIntent by lazy {
        PendingIntent.getActivity(
            context,
            0,
            Intent(context, HomeActivity::class.java),
            PendingIntent.FLAG_IMMUTABLE
        )
    }

    fun getNotification(): Notification {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            notificationManager.createNotificationChannel(createChannel())
        }

        return notificationBuilder.build()
    }

    fun updateNotification(notificationText: String? = null) {
        notificationText?.let { notificationBuilder.setContentText(it) }
        notificationManager.notify(NOTIFICATION_ID, notificationBuilder.build())
    }

    @RequiresApi(Build.VERSION_CODES.O)
    private fun createChannel() =
        NotificationChannel(
            CHANNEL_ID,
            CHANNEL_NAME,
            NotificationManager.IMPORTANCE_DEFAULT
        ).apply {
            description = CHANNEL_DESCRIPTION
            setSound(null, null)
        }

    companion object {
        const val NOTIFICATION_ID = 232
        private const val CHANNEL_ID = "Audio_Playback_Channel"
        private const val CHANNEL_NAME = "Audio_Playback"
        private const val CHANNEL_DESCRIPTION = "Audio_Playback_Description"
    }
}

enum class ServiceAction(val value: String) {
    START_ACTION("start"),
    STOP_ACTION("stop")
}