HCLTech Senior Android Developer Interview Questions and Answers

Q1. Data class in kotlin
Ans. 
Data class in Kotlin is used to represent a simple data container with automatically generated methods like equals(), hashCode(), toString(), and copy().
• Data classes are declared using the 'data' keyword before the class keyword.

• Properties of data classes are automatically generated component functions for destructuring declarations.

• Data classes cannot be abstract, open, sealed, or inner.

• Example: data class User(val na
Answered by AI
Add your answer
Q2. Scope functions
Add your answer
Q3. Explain viewmodel and mvvm
Ans. 
ViewModel is a class that stores and manages UI-related data in a lifecycle-conscious way. MVVM is an architectural pattern that separates the UI from the business logic.
• ViewModel is part of the Android Architecture Components and is used to store and manage UI-related data in a lifecycle-conscious way.

• ViewModel survives configuration changes such as screen rotations and retains its data.

• MVVM stands for Model-View-View...read more
Answered by AI
Add your answer
Q4. Higher order functions
Add your answer

Q1. Solid principles, core java,kotlin
Add your answer
Q2. Mvvm,mvp,mvc,flows
Add your answer
Q3. State flow shared flow
Add your answer
Q4. Builder pattern
Add your answer

Q1. Technical scenarios
Add your answer
Q2. Java coding,data structures
Add your answer
Q3. Algo,complex views,compose
Add your answer

Q1. Lifecycle of the Activity
Ans. 
The lifecycle of an Activity in Android refers to the series of states an Activity goes through from creation to destruction.
• An Activity goes through states like onCreate, onStart, onResume, onPause, onStop, onDestroy, etc.

• Each state has specific methods that can be overridden to perform actions at that state.

• For example, onCreate is called when the Activity is first created, onResume is called when the Activity is bro
Answered by AI
Add your answer
Q2. Push notification
Add your answer
Q3. About the project mentioned in the resume
Add your answer

Q1. How do you handle the multiple view in Recyclerview?
Ans. 
Multiple views in RecyclerView can be handled by using different view types and view holders.
• Use getItemViewType() method to return different view types based on position

• Create multiple view holders for each view type

• Bind data to each view holder based on its type

• Example: Creating a chat app with different message types like text, image, and video
Answered by AI
Add your answer

Q1. What is UI thread?
Ans. 
UI thread is the main thread in Android responsible for handling user interface interactions.
• UI thread is also known as the main thread in Android.

• It is responsible for handling user interface interactions such as drawing views, handling touch events, and updating UI components.

• Performing long-running tasks on the UI thread can lead to UI freezes and unresponsiveness.

• To perform background tasks and prevent blocking the...read more
Answered by AI
Add your answer

Q1. What is marker interface
Ans. 
Marker interface is an interface with no methods, used to mark a class for special treatment.
• Marker interfaces are used to provide metadata about the class.

• They do not have any methods to implement.

• Examples include Serializable interface in Java.
Answered by AI
Add your answer

Q1. What is fragment
Ans. 
A fragment is a modular section of an activity that has its own lifecycle, layout, and behavior.
• Fragments are reusable components that can be combined to create a multi-pane UI.

• They can be added or removed from an activity dynamically.

• Fragments have their own lifecycle methods such as onCreate, onCreateView, and onDestroyView.
Answered by AI
Add your answer

The question about prblm solving

Any presentation or pdf to submit it at any topic or else to explain it

The discussion with my team mate

Basic Array programs

Q1. MVVM Architecture
Add your answer
Q2. Dependency Injection
Add your answer

Q1. What is Corotuine and explain builder type.
Ans. 
Coroutines are a way to perform asynchronous programming in Android. Builder type is used to create and configure a coroutine.
• Coroutines in Android are used for managing asynchronous tasks without blocking the main thread.

• Builder type is used to create a coroutine with specific configuration options.

• Example: 'launch' is a builder type used to start a new coroutine.
Answered by AI
Add your answer
Q2. Unit testing with example of code
Ans. 
Unit testing is a software testing method where individual units or components of a software are tested in isolation.
• Unit testing helps in identifying bugs early in the development process.

• It ensures that each unit of code works correctly on its own.

• Unit tests are typically written using testing frameworks like JUnit or Mockito.

• Example: Testing a function that calculates the sum of two numbers.
Answered by AI
Add your answer