Android Background Processing

Sep 23 2022 · Kotlin 1.6, Android 12, Android Studio Chipmunk 2021.2.1

Part 3: Use Android Services

19. Create Foreground Services

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Notes: 19. Create Foreground Services

The student materials have been reviewed and are updated as of SEPTEMBER 2022.

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As you’ve learned so far, services in Android Oreo and higher are restricted.

const val NOTIFICATION_CHANNEL_NAME = "Synchronize service channel"
const val NOTIFICATION_CHANNEL_ID = "Synchronize ID"

class SynchronizeImagesService : Service() {

  private val remoteApi by lazy { App.remoteApi }

  override fun onBind(intent: Intent?): IBinder? = null

  override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
    showNotification()

    clearStorage()
    fetchImages()

    return START_NOT_STICKY
  }
}
const val NOTIFICATION_CHANNEL_NAME = "Synchronize service channel"
const val NOTIFICATION_CHANNEL_ID = "Synchronize ID"

class SynchronizeImagesService : Service() {

  ...
  private fun showNotification() {
    createNotificationChannel()
    val notificationIntent = Intent(this, MainActivity::class.java).apply {
      flags = Intent.FLAG_ACTIVITY_SINGLE_TOP
    }

    val pendingIntent = PendingIntent.getActivity(this,
        0, notificationIntent, 0)

    val notification = NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)
        .setContentTitle("Synchronization service")
        .setContentText("Downloading images")
        .setContentIntent(pendingIntent)
        .build()

    startForeground(1, notification)
  }
  ...
}
const val NOTIFICATION_CHANNEL_NAME = "Synchronize service channel"
const val NOTIFICATION_CHANNEL_ID = "Synchronize ID"

class SynchronizeImagesService : Service() {

  ...

  private fun createNotificationChannel() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
      val serviceChannel = NotificationChannel(
          NOTIFICATION_CHANNEL_ID,
          NOTIFICATION_CHANNEL_NAME,
          NotificationManager.IMPORTANCE_DEFAULT
      )
      val manager = getSystemService(NotificationManager::class.java)
      manager?.createNotificationChannel(serviceChannel)
    }
  }

  ...
}
  fun queueImagesForDownload(context: Context, images: Array<String>) {
    if (images.isNotEmpty()) {
      images.forEach { imageUrl ->
        val file = File(context.externalMediaDirs.first(), imageUrl)

        downloadImage(file, imageUrl)
      }
    }
  }
private fun synchronizeImages() {
  val intent = Intent(requireContext(), SynchronizeImagesService::class.java)
  activity?.startService(intent)
}