Android Background Processing

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

Part 3: Use Android Services

17. Use IntentService

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Notes: 17. Use IntentService

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

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The next type of service you’ll learn to implement serves as a one-off job. Similar to how you used the WorkManager, to start a piece of work, and then return a result, or not care about the result at all, you can do the same with a service.

const val SERVICE_NAME = "Download Image Service"

class DownloadService : IntentService(SERVICE_NAME) {

  override fun onHandleIntent(intent: Intent?) {
    val imagePath = intent?.getStringExtra("image_path")
    if (imagePath != null) {
      downloadImage(imagePath)
    }
  }

  private fun downloadImage(imagePath: String) {
    val file = File(applicationContext.externalMediaDirs.first(), imagePath)

    FileUtils.downloadImage(file, imagePath)
  }
}

class DownloadService : JobIntentService() {

  companion object {
    private const val JOB_ID = 10

    fun startWork(context: Context, intent: Intent) {
      enqueueWork(context, DownloadService::class.java, JOB_ID, intent)
    }
  }
  
  ...
}

class DownloadService : JobIntentService() {

  ...

  override fun onHandleWork(intent: Intent) {
    val imagePath = intent.getStringExtra("image_path")
    if (imagePath != null) {
      downloadImage(imagePath)
    } else {
      Log.d("Missing image path", "Stopping service")
      stopSelf()
    }
  }
  
  ...
}

class DownloadService : JobIntentService() {

  companion object {
    private const val JOB_ID = 10

    fun startWork(context: Context, intent: Intent) {
      enqueueWork(context, DownloadService::class.java, JOB_ID, intent)
    }
  }

  override fun onHandleWork(intent: Intent) {
    val imagePath = intent.getStringExtra("image_path")
    if (imagePath != null) {
      downloadImage(imagePath)
    } else {
      Log.d("Missing image path", "Stopping service")
      stopSelf()
    }
  }

  private fun downloadImage(imagePath: String) {
    val file = File(applicationContext.externalMediaDirs.first(), imagePath)

    FileUtils.downloadImage(file, imagePath)
  }
}

<uses-permission android:name="android.permission.WAKE_LOCK" />
<service
  android:name=".service.DownloadService"
  android:permission="android.permission.BIND_JOB_SERVICE" />

val intent = Intent()
intent.putExtra("image_path", imageUrl)
DownloadService.startWork(requireContext(), intent)