Android Background Processing
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Next episode: 19. Create Foreground Services
Notes: 18. Challenge - Services
The student materials have been reviewed and are updated as of SEPTEMBER 2022.
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It’s time to practice what you’ve learned about Services! :] In this challenge, you have to do one thing - implement the Synchronization feature using a one-off service.
class SynchronizeImagesService : JobIntentService() {
private val remoteApi by lazy { App.remoteApi }
companion object {
private const val JOB_ID = 15
fun startWork(context: Context, intent: Intent) {
enqueueWork(context, SynchronizeImagesService::class.java, JOB_ID, intent)
}
}
}
<service
android:name=".service.SynchronizeImagesService"
android:permission="android.permission.BIND_JOB_SERVICE" />
class SynchronizeImagesService : JobIntentService() {
private val remoteApi by lazy { App.remoteApi }
companion object {
private const val JOB_ID = 15
fun startWork(context: Context, intent: Intent) {
enqueueWork(context, SynchronizeImagesService::class.java, JOB_ID, intent)
}
}
override fun onHandleWork(intent: Intent) {
clearStorage()
fetchImages()
}
...
}
class SynchronizeImagesService : JobIntentService() {
...
private fun fetchImages() {
GlobalScope.launch {
val result = remoteApi.getImages()
if (result is Success) {
val imagesArray = result.data.map { it.imagePath }.toTypedArray()
FileUtils.queueImagesForDownload(applicationContext, imagesArray)
}
}
}
private fun clearStorage() {
FileUtils.clearLocalStorage(applicationContext)
}
}
private fun synchronizeImages() {
SynchronizeImagesService.startWork(requireContext(), Intent())
}