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Android App Development Interview Questions in Bangalore

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

Android App Development jobs in Bangalore

Bangalore (Bengaluru) is India's largest technology hub, with global product companies, engineering centres, unicorn start-ups and big IT-services campuses. Product-company interviews here are usually deeper, with more scenario, design and hands-on rounds.

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

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01

Write code to fetch two API results in parallel inside a ViewModel.

Coroutines and FlowMedium
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fun loadDashboard() { viewModelScope.launch { _state.value = UiState.Loading try { val (profile, orders) = coroutineScope { val p = async { repo.getProfile() } val o = async { repo.getOrders() } p.await() to o.await() } _state.value = UiState.Success(profile, orders) } catch (e: IOException) { _state.value = UiState.Error("Network error") } } }
02

What types of tests do you write for an Android app?

Testing, Performance and Play StoreEasy
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Local unit tests on the JVM cover ViewModels, use cases, repositories and mappers with JUnit, fakes and coroutine test tools; they are fast and most numerous. Instrumented tests run on a device or emulator for Room, Compose UI and integration flows. End-to-end UI tests check critical journeys like login and checkout. Screenshot tests catch visual regressions. Follow the testing pyramid: many unit tests, fewer UI tests.
03

Explain the network security configuration file.

Networking and APIsMedium
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network_security_config.xml, referenced from the manifest, controls TLS behaviour without code. Since Android 9, cleartext HTTP is blocked by default; you can allow it for specific debug domains. You can trust user-added CAs only in debug builds for tools like Charles or proxies, and define certificate pins with expiry. Keeping cleartext disabled in production is an important security baseline.
04

What is a BroadcastReceiver and what limits apply since Android 8?

Android Components and LifecycleMedium
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A BroadcastReceiver responds to broadcast intents. Since Android 8, most implicit broadcasts cannot be received by receivers declared in the manifest; you register them at runtime with registerReceiver while the app is running. A few exemptions exist, like BOOT_COMPLETED and locale change. Since Android 14, runtime receivers must specify RECEIVER_EXPORTED or RECEIVER_NOT_EXPORTED. onReceive runs on the main thread, so keep it short or use goAsync.
05

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.
06

Explain StateFlow versus SharedFlow.

Coroutines and FlowMedium
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StateFlow is a hot flow that always has a current value, replays only the latest value to new collectors and skips emissions equal to the current value. It is ideal for UI state. SharedFlow is a configurable hot flow with no required initial value, optional replay and buffer, and it emits every value including duplicates. It suits one-off events like navigation or snackbars, though many teams prefer a Channel or state-based events for those.
07

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.
08

The backend team changed a field from a number to a string and the app crashed for all users. How do you prevent this?

Networking and APIsMedium
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Short term, make parsing lenient for that field, for example with a custom serializer, and handle parse failures without crashing. Long term, agree on API contracts with versioning, use contract tests or a shared OpenAPI schema checked in CI, add ignoreUnknownKeys and default values in kotlinx.serialization, and use remote config or a minimum supported app version mechanism. Monitor parse errors as non-fatal events.
09

How do you test Retrofit networking code?

Networking and APIsMedium
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Use OkHttp MockWebServer to run a local server, enqueue responses with specific status codes, bodies and delays, and point Retrofit's base URL to it. Then call the API or repository and assert parsing, headers, error mapping and retry behaviour. Store sample JSON in test resources. For ViewModel tests, replace the repository with a fake instead of using MockWebServer, which keeps them fast.
10

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.
11

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()
12

Explain LaunchedEffect, DisposableEffect and SideEffect.

Jetpack ComposeMedium
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LaunchedEffect(key) launches a coroutine when it enters composition and restarts when the key changes, used for one-time loads or showing a snackbar. DisposableEffect(key) runs setup and requires an onDispose block for cleanup, used for registering listeners or lifecycle observers. SideEffect runs after every successful recomposition to publish Compose state to non-Compose code, such as analytics. Choose keys carefully so effects do not restart unexpectedly.
13

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.
14

A crash report shows a NullPointerException in Kotlin code. How can that happen if Kotlin is null safe?

Kotlin FundamentalsMedium
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Common causes are the !! operator, platform types from Java code without nullability annotations, accessing a lateinit property before assignment, calling a function from a constructor before properties are initialised, and reflection-based libraries like Gson setting non-null fields to null. Fix it by removing !!, adding annotations or explicit nullable types at the Java boundary, and using a Kotlin-aware serializer such as kotlinx.serialization or Moshi with Kotlin codegen.
15

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)
16

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 -->
17

Write a Compose UI test that checks an error appears when login is clicked with an empty email.

Jetpack ComposeMedium
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@get:Rule val rule = createComposeRule() @Test fun showsErrorForEmptyEmail() { rule.setContent { var state by remember { mutableStateOf(LoginState()) } LoginScreen( state = state, onLogin = { state = state.copy(error = "Email required") } ) } rule.onNodeWithText("Login").performClick() rule.onNodeWithText("Email required").assertIsDisplayed() }
18

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.
19

Explain object, companion object and object expressions.

Kotlin FundamentalsMedium
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An object declaration creates a thread-safe singleton initialised lazily on first access. A companion object is an object tied to a class, used for factory methods and constants, similar to static members in Java; add @JvmStatic for Java callers. An object expression creates an anonymous object on the spot, often to implement an interface such as a callback. Avoid holding Context or Activity references in singletons to prevent memory leaks.
20

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.
21

The app's cold start takes 4 seconds. How do you improve it?

Testing, Performance and Play StoreHard
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Measure first with Macrobenchmark StartupTimingMetric on a release build. Then reduce work in Application.onCreate by deferring SDK initialisation, using App Startup or lazy injection, and moving disk I/O off the main thread. Simplify the first screen, avoid blocking on network before showing UI, use the SplashScreen API properly, and add a Baseline Profile, which often improves startup by about 20 to 30 percent.
22

How does coroutine cancellation work, and why must code be cooperative?

Coroutines and FlowHard
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Cancelling a Job sets it to cancelling state, and the next suspension point such as delay, withContext or a suspending library call throws CancellationException. A tight CPU loop with no suspension keeps running, so check isActive or call ensureActive() or yield() inside it. Do not swallow CancellationException in a generic catch block; rethrow it. Use finally or withContext(NonCancellable) for cleanup that must finish.
23

Write a Gradle configuration for release signing and minification using environment variables.

Testing, Performance and Play StoreMedium
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android { signingConfigs { create("release") { storeFile = file(System.getenv("KEYSTORE_PATH") ?: "release.jks") storePassword = System.getenv("KEYSTORE_PASSWORD") keyAlias = System.getenv("KEY_ALIAS") keyPassword = System.getenv("KEY_PASSWORD") } } buildTypes { release { isMinifyEnabled = true isShrinkResources = true proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro") signingConfig = signingConfigs.getByName("release") } } }
24

What are higher-order functions and lambdas in Kotlin?

Kotlin FundamentalsEasy
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A higher-order function takes a function as a parameter or returns one. A lambda is an anonymous function literal like { x: Int -> x * 2 }. Collection operations such as map, filter and forEach are higher-order functions. In Android you see them in click listeners, Compose callbacks like onClick = { } and coroutine builders. If the last parameter is a function, the lambda can be written outside the parentheses, known as trailing lambda syntax.
25

What file storage options does Android provide and how does scoped storage affect them?

Room, DataStore and WorkManagerMedium
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App-specific storage (filesDir, cacheDir, getExternalFilesDir) needs no permission and is deleted on uninstall. Shared media is accessed through MediaStore, and other documents through the Storage Access Framework. Since Android 10, scoped storage blocks broad file system access, and since Android 13 media permissions are split into images, video and audio. The photo picker lets users choose media without any permission, which is preferred.
26

A new developer asks why we need interfaces for every repository. How do you answer?

App Architecture, MVVM and HiltEasy
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Interfaces let us swap implementations, mainly fakes in tests and alternate data sources, and they define clear contracts between modules so feature modules depend on abstractions instead of concrete network code. But the rule is not absolute: if a class has one implementation and is easy to test directly, an interface adds noise. I would explain the reason with an example test and our team convention.
27

How do you unit test a ViewModel that uses coroutines and StateFlow?

Coroutines and FlowHard
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Use kotlinx-coroutines-test. Replace Dispatchers.Main with a test dispatcher using Dispatchers.setMain in a JUnit rule, run tests in runTest so delays are skipped with virtual time, and inject dispatchers into repositories instead of hardcoding Dispatchers.IO. For flows, collect values with Turbine or backgroundScope and assert the sequence, such as Loading then Success. Fake repositories make results deterministic.
28

How do you store sensitive data such as tokens securely on Android?

Room, DataStore and WorkManagerHard
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Never store secrets in plain SharedPreferences or hardcode them in code. Use the Android Keystore to generate a key that never leaves secure hardware, and encrypt the data before storing it in DataStore or a file. The security-crypto EncryptedSharedPreferences library is deprecated, so many teams use Tink with Keystore. Keep tokens short-lived with refresh tokens, and clear them on logout. Exclude them from backups.
29

A payment SDK integration fails only in release builds. What would you check?

Networking and APIsMedium
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First check R8 or ProGuard: release builds shrink and obfuscate code, and the SDK may need keep rules for classes used by reflection or JSON parsing. Check the SDK documentation for required rules and add them to proguard-rules.pro. Also verify the release signing key SHA is registered with the provider, the correct production keys and base URLs are used, and network security config allows the domains.
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

What is recomposition?

Jetpack ComposeEasy
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Recomposition is Compose re-running composable functions whose inputs or read state changed, to update the UI. Compose tries to skip composables whose parameters are stable and unchanged. Composables can run often and in any order, so they must be side-effect free and fast; do not make network calls or write to variables inside them. Use Layout Inspector recomposition counts to find composables recomposing more than expected.
32

How do you handle exceptions in coroutines?

Coroutines and FlowMedium
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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.
33

What is DataStore and why does it replace SharedPreferences?

Room, DataStore and WorkManagerEasy
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Jetpack DataStore stores key-value pairs (Preferences DataStore) or typed objects (Proto DataStore) using coroutines and Flow. Unlike SharedPreferences, it is safe to call from the main thread because I/O is asynchronous, it reports errors through exceptions, and updates are transactional. SharedPreferences apply() can still block the main thread during lifecycle events and cause ANRs. Use one DataStore instance per file, ideally as a singleton.
34

How do you handle one-time navigation after a successful login in MVVM?

App Architecture, MVVM and HiltMedium
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Recommended practice is to reflect the result in state, such as isLoggedIn = true in UiState, and have the UI react with LaunchedEffect(state.isLoggedIn) to navigate, then the ViewModel marks it consumed if needed. An alternative is a Channel exposed as Flow and collected with lifecycle awareness. Avoid calling navigation directly from the ViewModel, because it should not reference NavController or views.
35

A user complains the app uses too much storage. How do you find and reduce it?

Room, DataStore and WorkManagerEasy
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Check Settings storage breakdown and inspect filesDir, cacheDir and databases with Device Explorer. Common culprits are unbounded image caches, old downloaded files, logs, and databases that never delete old rows. Set size limits on Coil and OkHttp caches, use cacheDir for temporary files so the system can clear them, delete old records with a periodic WorkManager job, and compress or downscale stored images.
36

How does Compose interoperate with existing XML views?

Jetpack ComposeMedium
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To use Compose inside views, add a ComposeView to an XML layout or Fragment and call setContent, setting a ViewCompositionStrategy suited to the lifecycle. To use a view inside Compose, wrap it with AndroidView(factory = { MapView(it) }, update = { }). This allows migrating screen by screen, starting with new screens or leaf components. Share the theme using a Compose theme adapter or by mirroring tokens.

Companies with offices in Bangalore (17)

E-commerce & consumer tech

Flipkart

Android App Development interview questions

  • 30 questions
  • 5 rounds

Bengaluru, Hyderabad

View questions
E-commerce & consumer tech

Swiggy

Android App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Hyderabad

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Fintech

PhonePe

Android App Development interview questions

  • 30 questions
  • 5 rounds

Bengaluru, Pune

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Fintech

Paytm

Android App Development interview questions

  • 30 questions
  • 5 rounds

Noida, Bengaluru, Mumbai

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Fintech

CRED

Android App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru

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E-commerce & consumer tech

Meesho

Android App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru

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E-commerce & consumer tech

Zepto

Android App Development interview questions

  • 30 questions
  • 4 rounds

Mumbai, Bengaluru

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Product

Google

Android App Development interview questions

  • 30 questions
  • 5 rounds

Bengaluru, Hyderabad, Gurugram +2

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Product

Amazon

Android App Development interview questions

  • 30 questions
  • 5 rounds

Bengaluru, Hyderabad, Chennai +2

View questions
Product

Microsoft

Android App Development interview questions

  • 30 questions
  • 5 rounds

Hyderabad, Bengaluru, Noida +2

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Hardware & semiconductors

Samsung

Android App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Noida, Delhi

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E-commerce & consumer tech

MakeMyTrip

Android App Development interview questions

  • 30 questions
  • 5 rounds

Gurugram, Bengaluru

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E-commerce & consumer tech

Myntra

Android App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru

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Fintech

Groww

Android App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru

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Product

Ola

Android App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru

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IT services

TCS

Android App Development interview questions

  • 30 questions
  • 4 rounds

Mumbai, Chennai, Pune +2

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IT services

Infosys

Android App Development interview questions

  • 30 questions
  • 4 rounds

Bengaluru, Mysuru, Pune +2

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Frequently asked questions

Which companies hire Android App Development professionals in Bangalore?

Companies with large offices in Bangalore include Flipkart, Swiggy, PhonePe, Paytm, CRED, Meesho, Zepto, Google, Amazon, Microsoft. Use their company pages below to practise employer-specific sets.

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

The questions depend more on the company than the city. Bangalore's mix of employers decides the style: Product-company interviews here are usually deeper, with more scenario, design and hands-on rounds

How do I find Android App Development jobs in Bangalore?

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

Other cities

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