XpressBees Interview Questions and Answers

Q1. What is MVVM and why is it recommended?
Ans. 
MVVM stands for Model-View-ViewModel, a design pattern that separates the UI from the business logic.
• MVVM separates the UI (View) from the business logic (ViewModel) by introducing a middle layer (ViewModel) that handles the communication between the two.

• Model represents the data and business logic, View represents the UI components, and ViewModel acts as an intermediary between them.

• MVVM promotes better code organizat...read more
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Q2. Difference between lateinit and lazy.
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lateinit is used for non-nullable properties that are initialized in the constructor, while lazy is used for properties that are initialized only when accessed for the first time.
• lateinit is used for properties that must be initialized before being used, while lazy is used for properties that can be initialized later.

• lateinit properties must be of non-nullable types, while lazy properties can be nullable.

• lateinit prope...read more
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Q3. Different Coroutines launchers and differences among them.
Ans. 
Different Coroutines launchers in Android and their differences.
• MainCoroutineDispatcher - runs on the main thread and is used for UI updates.

• IOCoroutineDispatcher - optimized for IO-bound tasks like network requests or database operations.

• DefaultCoroutineDispatcher - suitable for CPU-bound tasks that don't require the main thread.

• UnconfinedCoroutineDispatcher - runs on the current thread until the first suspension poin...read more
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Q4. Supervisor Scope Vs Coroutine Scope.
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Supervisor Scope is used in structured concurrency for managing child coroutines, while Coroutine Scope is used for launching coroutines.
• Supervisor Scope is used to manage the lifecycle of child coroutines, ensuring that if one child fails, it does not affect the others.

• Coroutine Scope is used for launching coroutines and managing their lifecycle.

• SupervisorScope is a part of the Kotlin coroutines library, while Corouti...read more
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Q5. Firebase rules and use cases.
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Q6. Firebase Push Notifications: How can we send different push notifications to other users?
Ans. 
Different push notifications can be sent to other users by targeting specific user IDs or using topics in Firebase Cloud Messaging.
• Use Firebase Cloud Messaging to send push notifications to specific user IDs.

• Utilize topics in Firebase Cloud Messaging to send notifications to groups of users with similar interests or characteristics.

• Implement logic in the backend to determine which users should receive which notificatio...read more
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Q7. Background Service and Foreground Service.
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Q8. Can foreground services be launched if application is in background?
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Yes, foreground services can be launched if application is in background.
• Foreground services can be launched even if the application is in the background to perform tasks that are noticeable to the user.

• Foreground services have a higher priority than background services and are less likely to be killed by the system.

• Examples of foreground services include music playback, navigation, or ongoing downloads.
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Q9. How to implement Retrofit and how can we make REST calls using that?
Ans. 
Retrofit is a type-safe HTTP client for Android and Java. It simplifies making REST API calls.
• Create a Retrofit instance using Retrofit.Builder class

• Define an interface with method definitions for API endpoints

• Use annotations like @GET, @POST, @PUT, @DELETE to specify the type of HTTP request

• Execute the API call using Call object and Callback interface

• Handle the response in onResponse() and onFailure() methods
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Q10. Room database migration strategy. How can we handle migration when one more column is added to the table without hampering previous data in that table?
Ans. 
Use Room database migration with SQLite ALTER TABLE command to add a new column without losing previous data.
• Create a new migration class in Room database with SQLite ALTER TABLE command to add the new column.

• Ensure that the new column is nullable or has a default value to prevent issues with existing data.

• Update the entity class in the code to include the new column and handle it accordingly in the app.

• Test the migrat...read more
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Q11. What is livedata? Different methods of MutableLiveData and differences between them.
Ans. 
LiveData is an observable data holder class. MutableLiveData is a subclass of LiveData that allows data to be changed.
• LiveData is an observable data holder class that is lifecycle-aware.

• MutableLiveData is a subclass of LiveData that allows data to be changed.

• Methods of MutableLiveData include setValue() and postValue().

• setValue() updates the value on the main thread, while postValue() updates the value asynchronously.

• L...read more
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Q12. What are the configuration changes?
Ans. 
Configuration changes refer to modifications made to settings or parameters in software or hardware systems.
• Configuration changes can include adjustments to network settings, display preferences, security settings, etc.

• Examples of configuration changes include changing the screen resolution on a computer, updating the Wi-Fi password on a router, or modifying notification settings on a smartphone.
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Q13. MVVM project folder structure.
Ans. 
MVVM project folder structure organizes code into separate layers for better maintainability and scalability.
• Separate folders for Models, Views, ViewModels, and Services

• Models folder contains data classes representing the data structure

• Views folder contains XML layout files for UI components

• ViewModels folder contains classes that handle business logic and interact with the data layer

• Services folder contains classes for...read more
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Q14. HTTP interceptors and why do we need it?
Ans. 
HTTP interceptors are used to intercept and modify HTTP requests and responses in an application.
• HTTP interceptors are commonly used in web development to add authentication tokens, logging, error handling, or other functionalities to HTTP requests and responses.

• They can be used to modify headers, add authorization tokens, log requests, handle errors, or perform any other pre-processing or post-processing tasks.

• Example...read more
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Q15. JVM overloads and JVM static? Is there any difference in JVM static and Companion object?
Ans. 
JVM static vs Companion object in Kotlin
• JVM static is used in Java to create static methods and variables within a class

• Companion object in Kotlin serves a similar purpose to JVM static, providing a way to define static members within a class

• Companion objects can implement interfaces, extend classes, and have their own methods and properties

• JVM static members are accessed using the class name, while companion object me...read more
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Q16. How do we access companion object from Java code?
Ans. 
Companion objects in Kotlin can be accessed from Java code using the @JvmStatic annotation.
• Use the @JvmStatic annotation on companion object functions or properties to access them from Java code.

• In Java code, access companion object members using the class name followed by the Companion keyword.
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Q17. Is there any Google recommendation for targetSdk version?
Ans. 
Google recommends targeting the latest SDK version for better performance and security.
• Google recommends targeting the latest stable SDK version for new apps

• Updating targetSdkVersion can improve app performance and security

• It is important to regularly update targetSdkVersion to stay compliant with Google Play Store policies
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Q18. How can we show riders location without using Map SDK?
Ans. 
Use geocoding APIs to convert location data into human-readable addresses.
• Use geocoding APIs like Google Geocoding API or OpenCage Geocoding API to convert latitude and longitude coordinates into human-readable addresses.

• Display the address instead of a map to show the rider's location.

• Allow riders to input their address manually if they prefer not to share their location.
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Q19. One coding question: Given an integer array nums sorted in non-decreasing order, remove the duplicates in place such that each unique element appears only once. The relative order of the elements should b...read more
Ans. 
Remove duplicates from sorted array in place and return number of unique elements.
• Use two pointers approach to iterate through the array and remove duplicates in place.

• Keep track of the current unique element and update the array accordingly.

• Return the count of unique elements after removing duplicates.
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Q1. What can you tell me about yourself?
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Q2. What are your hobbies?
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Q3. What do you like about your current position?
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Q1. My job experience? 3year experience of Logistic as a deo 'supervisor 'associate
Ans. 
I have 3 years of experience in logistics as a supervisor associate.
• Managed a team of employees to ensure efficient operations

• Coordinated transportation and distribution of goods

• Implemented strategies to optimize supply chain processes

• Resolved any issues or delays in the logistics process

• Utilized software systems to track inventory and shipments
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Q2. My self introduction My name is komal thakur I have passed 10th 12th exam from mp board and currently 1 year running from bsc from science collage my skills is deo and team hendling and operation handling
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Q3. My family beground ?
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Q4. My last Salary ?
Ans. 
I prefer to focus on the value I can bring to this role rather than my previous salary.
• I believe my previous salary is not relevant to my qualifications and experience for this position.

• I am looking for a competitive salary that aligns with the responsibilities and expectations of this role.

• I am open to discussing compensation based on the market rate and my skills and expertise.

• I am more interested in the growth oppor...read more
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Q5. My running job for what ?
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Q1. What is your name
Ans. 
My name is John Doe.
• My first name is John

• My last name is Doe
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Q2. Introducing ur self
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Q1. Why do you want work for us?
Ans. 
I am impressed by your company's innovative approach to data analysis and want to be a part of your team.
• I admire your company's reputation in the industry

• I am excited about the opportunity to work on cutting-edge projects

• I believe my skills and experience align well with the company's goals
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Q2. What are you strength
Ans. 
My strengths include strong analytical skills, attention to detail, and the ability to communicate complex data effectively.
• Strong analytical skills - able to interpret and analyze data effectively

• Attention to detail - meticulous in reviewing and ensuring accuracy of data

• Effective communication of complex data - able to present findings in a clear and understandable manner
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Involve working through a business problem or scenario with the interviewer to reach a logical conclusions

Q1. Introducing your self
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Q2. Tell me about your self
Ans. 
I am a data analyst with a strong background in statistics and data visualization.
• Experienced in using statistical tools such as R and Python

• Skilled in creating insightful data visualizations using Tableau

• Proficient in SQL for data querying and manipulation

• Strong analytical and problem-solving skills

• Excellent communication and presentation abilities
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Employers will set this type of test if they need to hire a person with excellent logical skills.

Code testing refers to running each line of code with a controlled input, and verifying if it performs the expected output

Q1. Introducing the same time
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Q2. Telling me about company
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