Photon Technologies Senior Android Developer Interview Questions and Answers

Normal MCQ questions reasoning, java related and programs outputs

Difference between abstract classes and interfaces, Array sort time complexity

Q1. Questions related to koltin
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Q2. Jetpack compose uses
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Jetpack Compose is a modern Android UI toolkit that simplifies and accelerates UI development.
• Declarative UI: Jetpack Compose allows developers to build UI using a declarative programming model.

• State management: Jetpack Compose handles state management efficiently, making it easier to update UI based on data changes.

• Compose functions: Developers can create reusable UI components using Compose functions.

• Interoperability...read more
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Q3. Difference between remember and rememberSaveable
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remember is used to store a value in a composable function, while rememberSaveable is used to store a value that survives configuration changes.
• remember is used to store a value that does not survive configuration changes

• rememberSaveable is used to store a value that survives configuration changes, such as rotation of the device

• rememberSaveable is typically used for storing view model data in Jetpack Compose
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Q4. Coroutines parallel and sequential processing
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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?
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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. Basic of kotlin questions
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Q2. Live data and life cycle
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Q3. Diff between MVVM and other architectures
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MVVM is a design pattern that separates the UI, business logic, and data layers, promoting better code organization and testability.
• MVVM stands for Model-View-ViewModel, where the ViewModel acts as an intermediary between the View and the Model.

• MVVM promotes data binding, making it easier to keep the UI in sync with the underlying data.

• Other architectures like MVC (Model-View-Controller) and MVP (Model-View-Presenter) ...read more
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Q1. What is MVVM and how to bind data using MVVM
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MVVM is a design pattern that separates the UI from the business logic by introducing a middle layer called ViewModel.
• Model-View-ViewModel design pattern

• ViewModel acts as a link between the Model and View

• Data binding is used to connect the ViewModel to the View

• Updates in the ViewModel automatically reflect in the View
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Q2. What is SSL pinning
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SSL pinning is a security measure used to prevent man-in-the-middle attacks by associating a specific SSL certificate with a particular app.
• SSL pinning involves hardcoding the expected SSL certificate or public key within the mobile app.

• This helps verify the server's identity and prevent attackers from intercepting and decrypting communication.

• SSL pinning can be implemented using libraries like TrustKit or manually by ...read more
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Q1. Based on the position
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Q1. About previous experience
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Q1. Basic android questions
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Q2. Services mvvm roomdb and all basic android things
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Q1. Android basics, fragments, activities, their life cycle
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Q2. Java basics, wrapper, kotlin, mvvm, api calls
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Q3. Dsa question- move all the zeroes to left and 1s to the right
Ans. 
Move all zeroes to left and ones to right in an array
• Iterate through the array from both ends

• Swap the elements if left is 1 and right is 0

• Stop when left and right pointers meet
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Q1. Service, background foreground service
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Q2. Mvvm, how does it work, viewmodel internal
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Q3. Memory leakage, how to avoid and identify
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Memory leakage can cause app crashes and slow performance. It can be avoided by proper memory management and identifying the root cause.
• Avoid creating unnecessary objects

• Release unused resources

• Use memory profiling tools like Android Profiler

• Avoid static references to objects

• Use weak references when necessary
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Q4. Perquisite to release app on play store
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Perquisites for releasing an app on Play Store
• Creating a developer account on Google Play Console

• Complying with Google Play policies and guidelines

• Providing accurate app information and metadata

• Ensuring app compatibility with target devices

• Testing app thoroughly for bugs and crashes

• Publishing app with appropriate content rating

• Setting up monetization options and pricing

• Providing customer support and responding to user
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