Android App Development Interview Questions in Thiruvananthapuram
36 practice questions with answers for Android App Development interviews in Thiruvananthapuram.
Android App Development jobs in Thiruvananthapuram
Thiruvananthapuram's Technopark is one of India's oldest IT parks, hosting IT-services, product and engineering-services companies. Data and testing teams here often work with global clients in finance, travel and healthcare.
Below are 36 questions that match the mix of service, product and domain employers hiring junior android developers in Thiruvananthapuram.
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01
Two screens show different values for the same cart count. How do you fix the architecture?
Each screen probably fetches and caches its own copy. Create a single CartRepository, scoped as a singleton, that owns cart data in Room or an in-memory StateFlow, and have both ViewModels observe its Flow instead of keeping private copies. Mutations go through the repository so every observer updates automatically. This enforces the single source of truth and removes the need for manual refresh calls between screens.
02
The crash-free rate dropped after a release only on Android 15 devices. How do you respond?
Halt the staged rollout immediately. Filter Crashlytics or Play vitals by OS version to find the top crash, then check Android 15 behaviour changes such as edge-to-edge enforcement, foreground service rules or new restrictions affecting your target SDK. Reproduce on an Android 15 emulator, fix, add a test, and resume rollout with the hotfix. Afterward, add Android 15 devices to the regular test matrix.
03
The Play Store rejected your update for a policy violation about permissions. What do you do?
Read the rejection email and policy centre message carefully to see which permission or declaration failed, often SMS, call log, background location, all-files access or exact alarms. Remove the permission if a less sensitive alternative exists, such as the SMS Retriever API or photo picker. Otherwise update the permission declaration form with a clear use case and video. Check the merged manifest for permissions added by libraries.
04
What conflict strategies does Room offer for inserts?
@Insert(onConflict = ...) supports REPLACE, which deletes the old row and inserts the new one; IGNORE, which skips the insert; ABORT, the default, which rolls back the transaction; and others. REPLACE can trigger cascading deletes on foreign keys because it deletes first. @Upsert, added in Room 2.5, inserts or updates without deleting, making it safer for syncing server data into local tables.
05
How do you handle push notifications with Firebase Cloud Messaging?
Extend FirebaseMessagingService, override onNewToken to send the token to your server, and onMessageReceived to handle data messages. Notification messages are shown automatically by the system when the app is in background; data messages are always delivered to your code. Request POST_NOTIFICATIONS on Android 13 and above, create channels, and keep onMessageReceived short, using WorkManager for longer work triggered by the push.
06
Write a Kotlin function that groups a list of orders by city and returns total amount per city.
Keep one Activity hosting a NavHost, and represent each screen as a Compose destination or Fragment. Define routes in a navigation graph, preferably with type-safe routes using Kotlin serialization in Navigation 2.8 and later. Use nested graphs for flows like login or checkout, pop the back stack with popUpTo when finishing a flow, and handle deep links on destinations. This simplifies shared transitions and state handling.
09
Users who reinstall the app lose all their settings. How can you restore them?
Android Auto Backup automatically backs up app data to the user's cloud backup account for apps targeting API 23 and above, unless disabled. Configure dataExtractionRules for Android 12 and above to include settings files and exclude tokens or caches. For important data like notes, sync to your own server tied to the user's account, since backup is not guaranteed. Test with adb shell bmgr commands.
10
How do you keep up with changes in Kotlin and Android?
I follow the Android Developers blog and release notes for Jetpack libraries, read the Kotlin release notes for each version, and watch sessions from the main yearly Android conferences. I try new APIs in a small side project before proposing them at work, and I read pull requests from experienced colleagues. Once a month I review deprecation warnings in our project so upgrades stay small and planned.
11
Your app has 60 Gradle modules and builds take 15 minutes. How would you speed them up?
Profile with Gradle build scans to find slow tasks. Enable the configuration cache and build cache, including a remote cache in CI. Use KSP instead of kapt, avoid unnecessary api dependencies so changes do not recompile many modules, use convention plugins, and keep non-transitive R classes. Check heavy annotation processors and give Gradle enough memory. Developers can build only the module they work on with a sample app.
Both separate UI from logic. MVI (Model-View-Intent) is stricter: the UI sends intents or actions, a reducer produces a single new immutable state, and side effects are handled separately. It gives one state object per screen and an easy-to-replay history. MVVM is more flexible, sometimes exposing several streams. In practice many Compose apps use MVVM with a single UiState data class, which is close to MVI.
13
How do you migrate from SharedPreferences to DataStore without losing user data?
Use SharedPreferencesMigration when creating the DataStore: preferencesDataStore(name = "settings", produceMigrations = { ctx -> listOf(SharedPreferencesMigration(ctx, "old_prefs")) }). On first access, DataStore copies the values and deletes the old file. Update all reads and writes to go through the new repository at once, because mixing both stores leads to inconsistent values. Test the migration with existing preference files.
14
Tell me about a time you disagreed with a designer about a UI decision.
Situation: a designer wanted a custom tiny close icon on a full-screen dialog. Task: keep the app accessible without blocking the design. Action: I showed that the touch target was below the 48dp guideline and that TalkBack had no label, and prototyped the same look with a larger invisible touch area. Result: we kept the visual style, passed accessibility checks, and agreed to review touch targets in future design handoffs.
15
The product team wants location tracking for delivery partners even when the app is closed. How do you implement it?
Use a foreground service with foregroundServiceType location, a visible notification, and the FusedLocationProviderClient with a sensible interval. Request ACCESS_FINE_LOCATION first, then ACCESS_BACKGROUND_LOCATION separately where truly needed, explaining why. Declare foreground service permissions for Android 14. Batch and upload locations efficiently, handle battery optimisation, and complete the Play Console location permissions declaration, since background location is reviewed strictly.
16
What is the difference between a started service, bound service and foreground service?
A started service runs after startService until it stops itself. A bound service offers a client-server interface to components that bind to it and stops when all unbind. A foreground service shows a persistent notification and has higher priority, used for music, navigation or ongoing calls. Since Android 14 a foreground service must declare a type such as mediaPlayback or location. For deferrable background work, use WorkManager instead.
17
Write a delegated property that logs whenever a value changes.
import kotlin.properties.Delegates
class Settings {
var theme: String by Delegates.observable("light") { prop, old, new ->
println("${prop.name} changed from $old to $new")
}
}
// Use Delegates.vetoable if you need to reject a change
// by returning false from the lambda.
18
Write a HiltViewModel that exposes a single UiState using StateFlow.
An explicit intent names the exact component to start, like Intent(this, DetailActivity::class.java), and is used inside your own app. An implicit intent declares an action and data, such as ACTION_VIEW with a URL or ACTION_SEND with text, and the system finds apps that can handle it through intent filters. For implicit intents, handle the case where no app can respond, and since Android 11 declare package visibility queries when needed.
21
A composable makes an API call every time the screen recomposes. What is wrong and how do you fix it?
The call is placed directly in the composable body, which runs on every recomposition. Composables must be side-effect free. Move loading to the ViewModel, triggered in init or by a user event, and expose the result as StateFlow. If something must start from composition, wrap it in LaunchedEffect with a stable key like the item ID, so it runs once per key rather than on every recomposition.
22
A text field loses its typed value after rotation. How do you fix it?
The value is probably held with remember, which is lost when the Activity is recreated. Either use rememberSaveable for local UI state, or keep the text in the ViewModel and pass it down with onValueChange. For data that must survive process death too, store it in SavedStateHandle in the ViewModel. Avoid storing text field state asynchronously, because delayed updates can cause cursor jumps.
23
Your app shows duplicate orders when users tap Pay twice on a slow network. How do you fix it?
Disable the button and show progress once tapped, but do not rely only on the UI. Generate an idempotency key on the client for each checkout attempt and send it with the request so the server returns the same result for retries. Ensure the payment call is not retried automatically by OkHttp for non-idempotent POSTs, and let the user check order status if the response is lost.
24
How should a Fragment or Activity collect a Flow safely?
Use lifecycleScope.launch with repeatOnLifecycle(Lifecycle.State.STARTED) so collection starts when the UI is visible and stops in the background, avoiding wasted work and crashes from updating views that are not ready. In a Fragment, use viewLifecycleOwner.lifecycleScope because the fragment view can be destroyed while the fragment lives. In Compose, use collectAsStateWithLifecycle(), which does the same lifecycle-aware collection.
Room is the single source of truth: the UI observes DAO flows and writes go to Room immediately with a sync status column like pending. A WorkManager job uploads pending changes when the network is available and pulls server changes, updating Room. Handle conflicts with timestamps or server versions, use unique work to avoid duplicate syncs, and show a small sync indicator. The app works fully without network.
Launch modes control how an Activity instance joins a task. standard creates a new instance each time. singleTop reuses the instance at the top and calls onNewIntent. singleTask keeps one instance in its task and clears activities above it. singleInstance puts it alone in a task, and singleInstancePerTask exists since Android 12. Intent flags like FLAG_ACTIVITY_CLEAR_TOP give similar control. Most modern single-activity apps rarely need them.
27
Write a manifest entry for a deep link that opens a product screen.
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter android:autoVerify="true">
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:scheme="https"
android:host="shop.example.com"
android:pathPrefix="/product" />
</intent-filter>
</activity>
<!-- autoVerify plus assetlinks.json on the domain makes it an App Link -->
28
Tell me about a time you handled a production crash under pressure.
Situation: after a release, crash-free users dropped from 99.6 to 97 percent. Task: stop the impact fast. Action: I checked Crashlytics, found a crash on Android 14 caused by a missing foreground service type, paused the staged rollout in Play Console, shipped a hotfix with a test on an emulator for that API level, and wrote a short postmortem. Result: crash rate recovered within a day and we added API-level checks to our release checklist.
29
You need to cache API responses so the home screen opens instantly. What approach do you take?
Store the response in Room, or a file for a single blob, and have the screen observe the cached data immediately while a refresh runs in the background, known as stale-while-revalidate. Store a timestamp to decide when cache is too old. HTTP caching with OkHttp Cache can also help for GET requests with proper cache headers. Show cached content first, then update smoothly when fresh data arrives.
30
How do you check network connectivity in modern Android?
Use ConnectivityManager with registerDefaultNetworkCallback and NetworkCapabilities to check NET_CAPABILITY_INTERNET and VALIDATED, and expose it as a Flow with callbackFlow. NetworkInfo and the CONNECTIVITY_ACTION broadcast are deprecated. Remember that being connected does not guarantee a working server, so still handle request failures. Use the status to show an offline banner and pause retries, not to block every request.
Dependency injection means classes receive their dependencies from outside rather than creating them, making code testable and loosely coupled. Hilt, built on Dagger, is Jetpack's recommended DI library. It generates code at compile time, provides standard components tied to Android lifecycles (SingletonComponent, ActivityRetainedComponent, ViewModelComponent), and integrates with ViewModels via @HiltViewModel. Errors appear at compile time rather than runtime.
32
Write a unit test for a ViewModel using a fake repository and runTest.
class ProductViewModelTest {
@get:Rule val mainRule = MainDispatcherRule()
@Test
fun loadsProductsIntoState() = runTest {
val fake = FakeProductRepository(listOf(Product("1", "Pen", 10.0)))
val vm = ProductViewModel(fake)
advanceUntilIdle()
val state = vm.state.value
assertFalse(state.loading)
assertEquals(1, state.items.size)
assertNull(state.error)
}
}
Use try-catch around suspend calls for expected failures like network errors; this is the clearest approach. A CoroutineExceptionHandler on a root launch catches uncaught exceptions as a last resort for logging, but it does not work for async or child coroutines. For async, exceptions surface at await. Always rethrow CancellationException. Many teams wrap results in a Result or sealed type so the UI layer gets an explicit error state.
34
Write a Flow that combines user settings and product list into one UI state.
I would use Kotlin, Jetpack Compose with Material 3, MVVM with unidirectional data flow, Hilt for DI, Coroutines and Flow, Retrofit with OkHttp and kotlinx.serialization, Room for offline data, DataStore for preferences, WorkManager for background sync, and Navigation Compose. For fintech, add certificate pinning considerations, encrypted storage via Keystore, Play Integrity checks, and strong test coverage. Start modular from day one with core and feature modules.
36
After an app update, users report that the app crashes on launch. Logs show a Room migration error. What do you do?
Immediately halt the staged rollout in Play Console. Reproduce by installing the previous version, adding data, and upgrading. The schema version was probably increased without a matching migration, or a migration SQL does not match the new entity. Write the correct Migration, test it with MigrationTestHelper from every supported old version, and release a hotfix. Avoid destructive fallback because it deletes user data.
Few big employers listed in Thiruvananthapuram?
Many Thiruvananthapuram candidates also apply to teams in Bangalore and to remote or hybrid roles. Practise the Bangalore set as well.
Which companies hire Android App Development professionals in Thiruvananthapuram?
Companies with large offices in Thiruvananthapuram include many IT services and product firms. Use their company pages below to practise employer-specific sets.
Are Android App Development interviews in Thiruvananthapuram different from other cities?
The questions depend more on the company than the city. Thiruvananthapuram's mix of employers decides the style: Data and testing teams here often work with global clients in finance, travel and healthcare
How do I find Android App Development jobs in Thiruvananthapuram?
Shortlist companies with Thiruvananthapuram offices, keep your CV focused on Android App Development projects, apply on company career pages and job portals with the Thiruvananthapuram filter, and practise the questions on this page before each interview.