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Android App Development Interview Questions in Chennai

36 practice questions with answers for Android App Development interviews in Chennai.

Android App Development jobs in Chennai

Chennai is a long-standing IT-services and SaaS hub along OMR, with strong demand for testing, data and support-engineering roles. Many companies here hire freshers in large batches and train them on the job.

Below are 36 questions that match the mix of service, product and domain employers hiring junior android developers in Chennai.

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01

How do default and named arguments reduce the need for overloads?

Kotlin FundamentalsEasy
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Kotlin functions can define default values, such as fun showToast(msg: String, long: Boolean = false), so callers skip arguments they do not need. Named arguments, like showToast(msg = "Saved", long = true), make calls readable and let you change argument order. Together they replace telescoping constructors and builder patterns in many cases. For Java callers, add @JvmOverloads so overloads are generated automatically.
02

Write a Retrofit interface for listing products with paging and fetching one product.

Networking and APIsEasy
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interface ShopApi { @GET("products") suspend fun getProducts( @Query("page") page: Int, @Query("size") size: Int = 20 ): ProductPageDto @GET("products/{id}") suspend fun getProduct(@Path("id") id: String): Response<ProductDto> @POST("cart") suspend fun addToCart(@Body body: AddToCartRequest): CartDto }
03

Network calls keep running after the user leaves a screen and results arrive late. How do you fix this?

Coroutines and FlowMedium
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The work is likely launched in GlobalScope, a custom scope never cancelled, or an Application-level scope. Move it to viewModelScope so it is cancelled when the ViewModel is cleared, and make sure the calls are cancellable, which Retrofit suspend functions are. If work must outlive the screen, like uploading a file, move it to WorkManager or an application scope deliberately, and do not update UI from it.
04

You are starting a new app for a fintech startup. Which architecture and libraries would you choose and why?

App Architecture, MVVM and HiltMedium
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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.
05

QA says a bug happens only on one manufacturer's phones. How do you debug it?

Testing, Performance and Play StoreMedium
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Get exact device model, OS and skin versions, and steps. Use a remote device lab or Firebase Test Lab to reproduce if you lack the device. Collect logcat and bug reports, and compare behaviour around known differences like battery optimisation, autostart restrictions, custom permission dialogs or WebView versions. Add targeted logging or a non-fatal Crashlytics event, then apply a fix guarded by checks only if necessary.
06

A screen shows a snackbar again every time the device rotates. How do you fix it?

Coroutines and FlowMedium
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The event is probably stored as state in a StateFlow or LiveData, so it is re-delivered when the new Activity collects again. Options: model it as part of UI state and have the UI call a function like onMessageShown() to clear it after display, which is the approach the official guidance recommends; or send it through a Channel exposed with receiveAsFlow so each event is consumed once. Collect with lifecycle awareness to avoid losing events.
07

How do you model API results and errors cleanly for the UI?

Networking and APIsMedium
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Map transport-level outcomes into a sealed result type in the data layer, for example Success(data), HttpError(code, message) and NetworkError. Catch IOException for connectivity, HttpException for non-2xx codes, and serialization exceptions for bad payloads, and never catch CancellationException. The ViewModel converts these into user-friendly UiState messages. Keep DTOs separate from domain models so API changes do not ripple through the UI.
08

Your team is migrating a Java Android app to Kotlin. How would you plan it?

Kotlin FundamentalsMedium
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Kotlin and Java interoperate, so migrate gradually rather than all at once. Start with new features in Kotlin, then convert leaf classes like models and utilities, writing tests before converting. Add nullability annotations to Java code so Kotlin sees correct types. Review auto-converted code because it often overuses !!. Track progress per module and agree on style rules with ktlint or detekt so the codebase stays consistent.
09

What does the inline keyword do and when should you use reified?

Kotlin FundamentalsHard
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inline tells the compiler to copy the function body and lambda bodies into the call site, avoiding the object allocation for lambdas and enabling non-local returns. It suits small higher-order functions called often. reified can only be used in inline functions and keeps the generic type available at runtime, so you can write inline fun <reified T> Gson.fromJson(json: String) and use T::class. Avoid inlining large functions since it increases bytecode size.
10

What is the difference between a started service, bound service and foreground service?

Android Components and LifecycleMedium
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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.
11

What is the difference between @Provides and @Binds in Hilt?

App Architecture, MVVM and HiltMedium
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@Provides is used in a module function that constructs and returns an object, needed for third-party classes like Retrofit or Room that you cannot annotate with @Inject. @Binds is used on an abstract function in an abstract module to tell Hilt which implementation to use for an interface, when the implementation already has an @Inject constructor. @Binds generates less code and is slightly more efficient.
12

How do you write tests for a Room DAO?

Room, DataStore and WorkManagerMedium
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Create an in-memory database with Room.inMemoryDatabaseBuilder in an instrumented test or with Robolectric, get the DAO, insert test data and assert query results. For Flow queries, collect the first value with first() or use Turbine. Close the database in @After. Test edge cases like conflict strategies and ordering. In-memory databases are fast and isolated, so each test starts clean.
13

What is the difference between lateinit and by lazy?

Kotlin FundamentalsMedium
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lateinit works only with var and non-primitive, non-null types; you promise to assign it before use, and accessing it early throws UninitializedPropertyAccessException. by lazy works with val; the initialiser runs once on first access and the result is cached, thread-safe by default. Use lateinit for values injected or set in lifecycle callbacks, such as a binding in onCreate, and lazy for expensive values computed on demand.
14

Explain generics variance with in and out in Kotlin.

Kotlin FundamentalsHard
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out marks a type parameter as covariant: the class only produces T, so List<String> can be used as List<out Any>. in marks it contravariant: the class only consumes T, like Comparator<in T>. This is declaration-site variance, replacing Java wildcards such as ? extends and ? super. Use-site projections like Array<out Number> are also possible. Getting variance right lets APIs accept more types safely without unchecked casts.
15

Explain the Fragment lifecycle and why viewLifecycleOwner matters.

Android Components and LifecycleMedium
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A Fragment has its own lifecycle (onCreate to onDestroy) and a separate view lifecycle (onCreateView to onDestroyView). When a fragment goes to the back stack its view is destroyed but the fragment instance may stay. If you observe LiveData or collect flows with the fragment itself as owner, observers pile up and can touch a dead view. Use viewLifecycleOwner and clear view binding references in onDestroyView.
16

What is CompositionLocal and when should you use it?

Jetpack ComposeMedium
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CompositionLocal passes data implicitly down the tree without threading it through every parameter, like LocalContext, LocalDensity or MaterialTheme values. Create one with compositionLocalOf when values change often, or staticCompositionLocalOf when they rarely change. Use it for cross-cutting values like theme or analytics loggers, not for regular screen data, because implicit dependencies make composables harder to understand and test.
17

A teammate uses !! everywhere to silence compiler errors. How do you handle this in code review?

Kotlin FundamentalsEasy
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Explain calmly that !! converts a compile-time check into a possible runtime crash. Suggest alternatives per case: safe calls with ?.let, Elvis with a default or early return, requireNotNull with a clear message, or fixing the type at the source so it is non-null. Add a detekt rule to flag !! in new code. Pair with them on one file so the change feels like help, not criticism.
18

Write a function that retries a suspend call with exponential backoff.

Networking and APIsMedium
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suspend fun <T> retryWithBackoff( times: Int = 3, initialDelay: Long = 500, factor: Double = 2.0, block: suspend () -> T ): T { var delayMs = initialDelay repeat(times - 1) { try { return block() } catch (e: IOException) { /* retry */ } delay(delayMs) delayMs = (delayMs * factor).toLong() } return block() }
19

How should a Fragment or Activity collect a Flow safely?

Coroutines and FlowMedium
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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.
20

How do you store relationships in Room, such as orders with items?

Room, DataStore and WorkManagerMedium
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Create separate entities and link them with a foreign key column, like OrderItem.orderId. Then define a data class with @Embedded order and @Relation(parentColumn = "id", entityColumn = "orderId") items, and query it in a DAO method annotated with @Transaction so both reads are consistent. For many-to-many relations, add a cross-reference entity with junction. Add indices on foreign key columns for query speed.
21

The app shows an ANR when the user taps Save. The save function is suspend. What could be wrong?

Coroutines and FlowMedium
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A suspend function does not automatically run off the main thread. If it calls blocking code, like a synchronous file write, a SharedPreferences commit, a blocking SDK or heavy JSON parsing, it still blocks the main thread. Check with a profiler or StrictMode. Fix by wrapping the blocking part in withContext(Dispatchers.IO) or Default, or by using main-safe APIs such as Room suspend DAOs or DataStore.
22

Write an OkHttp interceptor that adds a bearer token to every request.

Networking and APIsMedium
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class AuthInterceptor @Inject constructor( private val tokenStore: TokenStore ) : Interceptor { override fun intercept(chain: Interceptor.Chain): Response { val token = tokenStore.currentAccessToken() val request = chain.request().newBuilder().apply { if (token != null) header("Authorization", "Bearer $token") }.build() return chain.proceed(request) } } val client = OkHttpClient.Builder() .addInterceptor(authInterceptor) .build()
23

The crash-free rate dropped after a release only on Android 15 devices. How do you respond?

Testing, Performance and Play StoreMedium
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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.
24

Write a periodic sync job with WorkManager that runs only on unmetered network.

Room, DataStore and WorkManagerMedium
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class SyncWorker(ctx: Context, params: WorkerParameters) : CoroutineWorker(ctx, params) { override suspend fun doWork(): Result = try { repo.sync() Result.success() } catch (e: IOException) { if (runAttemptCount < 3) Result.retry() else Result.failure() } } val request = PeriodicWorkRequestBuilder<SyncWorker>(6, TimeUnit.HOURS) .setConstraints(Constraints(requiredNetworkType = NetworkType.UNMETERED)) .setBackoffCriteria(BackoffPolicy.EXPONENTIAL, 30, TimeUnit.SECONDS) .build() WorkManager.getInstance(context).enqueueUniquePeriodicWork( "sync", ExistingPeriodicWorkPolicy.KEEP, request)
25

What is an Android App Bundle and why does Play require it?

Testing, Performance and Play StoreEasy
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An App Bundle (.aab) is a publishing format containing all compiled code and resources. The Play Store generates optimised APKs for each device configuration, delivering only the needed screen density, CPU architecture and language resources, which reduces download size. Since August 2021, new apps on Play must use AAB with Play App Signing, where the store holds the app signing key and you sign uploads with an upload key.
26

Write a delegated property that logs whenever a value changes.

Kotlin FundamentalsMedium
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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.
27

What conflict strategies does Room offer for inserts?

Room, DataStore and WorkManagerMedium
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@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.
28

Explain the difference between let, run, with, apply and also.

Kotlin FundamentalsMedium
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All are scope functions that run a block on an object. let and also receive the object as it; run, with and apply receive it as this. let, run and with return the lambda result, while apply and also return the object itself. Typical use: let for null checks (user?.let { }), apply for configuring an object, also for side effects like logging, and run or with for computing a result from an object.
29

Write a manifest entry for a deep link that opens a product screen.

Android Components and LifecycleMedium
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<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 -->
30

Users who reinstall the app lose all their settings. How can you restore them?

Room, DataStore and WorkManagerMedium
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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.
31

Images in a feed load slowly and the app runs out of memory. What do you change?

Networking and APIsMedium
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Use an image library like Coil, which handles memory and disk caching, request downsampling to the view size, and cancellation when items scroll away. Ask the backend or CDN for resized, compressed images such as WebP instead of full-size originals. Use placeholders and crossfade, avoid holding Bitmaps in ViewModels, and set memory cache limits. Profile with Memory Profiler to confirm the large allocations are gone.
32

A composable makes an API call every time the screen recomposes. What is wrong and how do you fix it?

Jetpack ComposeEasy
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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.
33

What is an ANR and how do you prevent it?

Testing, Performance and Play StoreEasy
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An ANR (Application Not Responding) happens when the main thread is blocked, for example an input event not handled within about 5 seconds or a BroadcastReceiver taking too long. Causes include disk or network work on the main thread, heavy computation, lock contention and slow SharedPreferences commits. Prevent ANRs by moving work to background dispatchers, using StrictMode in debug builds, and tracking ANR rates in Android vitals.
34

Users report the app loses form data when they switch to another app and come back after a while. Why?

Android Components and LifecycleMedium
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The system killed the process to reclaim memory while the app was in the background. When the user returns, Android recreates the Activity but ViewModel data is gone because the process died. Fix it by storing small UI state in SavedStateHandle or rememberSaveable, which survive process death, and persisting drafts to Room or DataStore. Test with Don't keep activities or adb shell am kill.
35

What is the difference between a deep link and an Android App Link?

Android Components and LifecycleMedium
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A deep link is any intent filter that opens your app for a URI; if several apps can handle it, the user sees a chooser. An App Link is an HTTPS deep link verified with android:autoVerify and a Digital Asset Links file at /.well-known/assetlinks.json on your domain, containing your app's signing certificate fingerprint. Verified links open your app directly. Remember to include the Play App Signing key fingerprint.
36

How do LazyColumn keys improve performance and correctness?

Jetpack ComposeMedium
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By default, items are identified by position, so inserting or deleting an item can make Compose reuse state for the wrong item and recompose more than needed. Supplying key = { it.id } gives each item a stable identity, so remembered state, animations with animateItem and scroll position follow the right item. Also supply contentType for mixed lists so compositions are reused efficiently. Keys must be unique and Bundle-saveable.

Companies with offices in Chennai (4)

Product

Amazon

Android App Development interview questions

  • 30 questions
  • 5 rounds

Bengaluru, Hyderabad, Chennai +2

View questions
IT services

TCS

Android App Development interview questions

  • 30 questions
  • 4 rounds

Mumbai, Chennai, Pune +2

View questions
IT services

Infosys

Android App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Mysuru, Pune +2

View questions
Product

Zoho

Android App Development interview questions

  • 30 questions
  • 5 rounds

Chennai, Tenkasi

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Frequently asked questions

Which companies hire Android App Development professionals in Chennai?

Companies with large offices in Chennai include Amazon, TCS, Infosys, Zoho. Use their company pages below to practise employer-specific sets.

Are Android App Development interviews in Chennai different from other cities?

The questions depend more on the company than the city. Chennai's mix of employers decides the style: Many companies here hire freshers in large batches and train them on the job

How do I find Android App Development jobs in Chennai?

Shortlist companies with Chennai offices, keep your CV focused on Android App Development projects, apply on company career pages and job portals with the Chennai filter, and practise the questions on this page before each interview.

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