Effective background tasks on Android
summary
Android 12 limits when apps can start foreground services from the background (apps targeting API 31+) and introduces a defer notification for 10 seconds rule to avoid flicker. Data show users see 2 to over 500 foreground-service notifications per day, almost half start from the background, ~70% run under 10 seconds and most sessions under two minutes. For urgent short work the OS offers expedited jobs via WorkManager 2.7 and preserves exemptions like user taps, high‑priority FCM and geofencing; consider non‑expedited WorkManager for longer tasks.
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