Android draait op een enorme reeks apparaten en OS-versies ('fragmentatie'), dus apps moeten versiecompatibiliteit afhandelen — oudere versies ondersteunen terwijl nieuwere functies veilig worden gebruikt. Het begrijpen van SDK-niveaus, compatibiliteitsbibliotheken en graceful degradation is belangrijk.
SDK-niveaus: min, target, compile
minSdk → the OLDEST Android version the app supports (older devices can't install it)
→ lower minSdk = more devices reached, but more compatibility work
targetSdk → the version the app is TESTED/optimized against (and opts into its behaviors)
→ should be kept current (Play requires a recent targetSdk)
compileSdk → the SDK version used to COMPILE (access to newer APIs)
→ Balance: support enough old devices (minSdk) while targeting current behavior (targetSdk).
