Android WorkManager Masterclass: Reliable Background Sync & Battery Optimization

Why Legacy AlarmManager & Services Are Deprecated

Modern Android versions enforce aggressive power-management restrictions (Doze Mode, App Standby Buckets). Background services started while an app is in the background are instantly terminated with ForegroundServiceStartNotAllowedException. WorkManager is the official solution for deferrable, guaranteed background execution.

1. Building a CoroutineWorker

class SyncDataWorker(context: Context, params: WorkerParameters) : CoroutineWorker(context, params) {
    override suspend fun doWork(): Result {
        return try {
            val api = RetrofitClient.instance
            val response = api.fetchLatestUpdates()
            DatabaseClient.db.articleDao().insertArticles(response)
            Result.success()
        } catch (e: Exception) {
            Result.retry()
        }
    }
}

2. Scheduling with Power & Network Constraints

val constraints = Constraints.Builder()
    .setRequiredNetworkType(NetworkType.CONNECTED)
    .setRequiresBatteryNotLow(true)
    .build()

val periodicWork = PeriodicWorkRequestBuilder(12, TimeUnit.HOURS)
    .setConstraints(constraints)
    .build()

WorkManager.getInstance(context).enqueueUniquePeriodicWork(
    "PeriodicSyncJob",
    ExistingPeriodicWorkPolicy.KEEP,
    periodicWork
)