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of 34What is LiveData and how does it differ from Observable fields?
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LiveData is a lifecycle-aware observable data holder. Key differences from regular observables:
- Lifecycle awareness: Only notifies active observers
- Automatic cleanup: Removes observers when lifecycle is destroyed
- No memory leaks: Automatically handles observer lifecycle
- Main thread delivery: Updates always delivered on main thread
class UserViewModel : ViewModel() {
private val _userName = MutableLiveData<String>()
val userName: LiveData<String> = _userName
// Observer only receives updates when in STARTED or RESUMED state
}
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What is Room and what are its main components?
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Room is an SQLite object mapping library providing an abstraction layer over SQLite. Main components:
- Entity: Represents a table (@Entity)
- DAO: Contains database access methods (@Dao)
- Database: Main access point (@Database)
@Entity
data class User(
@PrimaryKey val id: Int,
val name: String
)
@Dao
interface UserDao {
@Query("SELECT * FROM user")
suspend fun getAllUsers(): List<User>
}
@Database(entities = [User::class], version = 1)
abstract class AppDatabase : RoomDatabase() {
abstract fun userDao(): UserDao
}
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What is Navigation Component and what problems does it solve?
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Navigation Component manages fragment transactions and provides:
- Visual navigation editor: Design navigation in Android Studio
- Type-safe argument passing: Using Safe Args plugin
- Built-in animations: Transition animations between destinations
- Deep linking: Handle incoming links
- Back stack management: Automatic handling of up/back actions
Components: NavGraph, NavController, NavDestination, and navigation XML.
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How do you pass data between fragments using Navigation Component?
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Using Safe Args plugin:
// In navigation XML
<fragment android:id="@+id/detailFragment">
<argument
android:name="userId"
app:argType="integer" />
</fragment>
// Passing data
val action = UserListFragmentDirections.actionToDetail(userId = 123)
findNavController().navigate(action)
// Receiving data
class DetailFragment : Fragment() {
private val args: DetailFragmentArgs by navArgs()
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
val userId = args.userId
}
}
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What is WorkManager and when should you use it?
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WorkManager is for deferrable, guaranteed background work that needs to run even if the app is closed or device is restarted.
Use cases:
- Uploading data to server
- Syncing data
- Image processing
- Periodic cleanup tasks
Don't use for:
- Real-time messaging
- Immediate execution tasks
- Tasks that must run at exact times
WorkManager guarantees execution and handles API level differences automatically.
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What's the difference between Data Binding and View Binding?
What is Jetpack Compose and how does it differ from traditional View system?
Explain the MVVM pattern in context of Android Architecture Components.
Explain ViewModel and its lifecycle. Why doesn't it get destroyed on configuration changes?
What are the different types of LiveData and when to use each?
How do you handle database migrations in Room?
Explain different types of relationships in Room.
What are the threading rules in Room and how do you handle them?
Explain different navigation patterns and when to use each.
How do you handle deep links in Navigation Component?
Explain different types of WorkRequests in WorkManager.
How do you chain work operations in WorkManager?
What is Paging Library and what are its benefits?
How do you implement basic paging with Paging 3?
How do you handle loading states in Paging 3?
How do you implement custom binding adapters in Data Binding?
Explain state management in Compose with remember and mutableStateOf.
What is DataStore and how does it improve upon SharedPreferences?
What is Hilt and how does it simplify dependency injection?
Explain CameraX and its advantages over Camera2 API.
What is the difference between Flow and LiveData?
How do you implement Repository pattern with Room and Retrofit?
How do you implement database testing in Room?
How do you monitor work status and handle failures in WorkManager?
How do you handle side effects in Compose?
How do you implement encrypted storage in Android with Security library?
How do you test ViewModels that use Hilt?
What are the best practices for using Android Jetpack libraries?
What are Jetpack Compose effects and when to use each?
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Android Jetpack Libraries cheatsheet
Android Jetpack Interview Cheat Sheet
- Overview01
- Architecture Components02
- UI Components03
- Foundation Components04
- Behavior Components05
- Dependency Injection with Hilt06
- Testing07
- Best Practices08
- Critical Interview Topics09
- Performance Optimization10
- Key Takeaways for Interviews11
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