Macs Infosolution 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
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Q2. Scope functions
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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
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Q4. Higher order functions
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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
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Q2. Push notification
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Q3. About the project mentioned in the resume
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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
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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
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Q1. 1. What is happen when App is launch on Android 2. Internal working of MVVM 3. System design for 2 page App that has one listing and detail page 4. Clean Architecture 5. How garbage collector works 6. Mo...read more
Ans. 
Answers to various technical questions related to Android development.
• 1. When an app is launched on Android, the system creates a new instance of the Activity class for the main activity and loads the layout.

• 2. MVVM (Model-View-ViewModel) is a design pattern that separates the UI, business logic, and data. The View interacts with the ViewModel to update the data.

• 3. For a 2-page app with a listing and detail page, you c...read more
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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.
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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.
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Basic Array programs

Q1. MVVM Architecture
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Q2. Dependency Injection
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Q1. HR will ask general questions about your technical and education details
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Q1. Basic Android questions Basic Java questions Basic OOPs questions Questions on Android framework, jetpack, database and XML Questions on kotlin
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Q1. Salary and work nature discussion
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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.
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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.
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