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A preview from our curated question bank. The generator produces fresh, AI-tailored questions on each run.
What are the four main components of an Android application?
Tip: Activity (UI screen), Service (background processing), BroadcastReceiver (system/app events), ContentProvider (shared data). Each is declared in `AndroidManifest.xml`. Interviewers often ask which to use for a given scenario.
Explain the Android Activity lifecycle. When is `onStop` called vs `onPause`?
Tip: `onPause`: activity is partially obscured (another activity in front). `onStop`: activity is fully hidden. `onDestroy`: activity is being destroyed. Save state in `onPause` (not `onStop`) for guaranteed execution.
What is the difference between Fragment and Activity?
Tip: Activity is a standalone screen. Fragment is a modular section of UI hosted inside an Activity — multiple fragments can share one Activity. Use Fragments for adaptive layouts (phone vs tablet) and Navigation Component.
What are Jetpack components? Name and explain three commonly used ones.
Tip: ViewModel: survives configuration changes, holds UI state. LiveData/StateFlow: observable data holder that respects lifecycle. Room: SQLite abstraction with compile-time query validation. Navigation Component: handles fragment transactions declaratively.
What are Kotlin coroutines? How do they differ from threads?
Tip: Coroutines are lightweight cooperative concurrency primitives — they suspend without blocking a thread. A single thread can run thousands of coroutines. Use `viewModelScope.launch {}` for ViewModel-scoped coroutines. Use `Dispatchers.IO` for I/O, `Dispatchers.Main` for UI updates.
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