VirtualMaze Junior Android Developer Interview Questions and Answers

Q1. Android Architecture MVVM Retrofit
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Q1. Services of Android
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Services in Android are background components that perform long-running operations.
• Services can run in the background even if the app is not in the foreground.

• They can be used for tasks like playing music, downloading files, or syncing data.

• There are different types of services like started services, bound services, and foreground services.
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Q1. IOS & Swift Basics
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Q2. 1 Coding question( String/ Array) Level
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Q3. Write Delegation example, They will show the code and ask whats wrong in the code & whats the o/p of the code. expect questions like Closure Capture List, InOut parameter
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Q1. This round was not based on iOS for me. Question was related to my past projects based on my resume.
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Q2. More focous on architectures and design patterns like MVC, MVVM, Viper, Solid, Clean coding
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Q1. Whats your expected Salary?
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My expected salary range is $100,000 - $120,000 per year based on my experience and skills.
• Based on my 5+ years of experience in IOS development, I am looking for a competitive salary in the range of $100,000 - $120,000 per year.

• I have a strong track record of delivering high-quality IOS applications and believe my skills warrant a salary in this range.

• I am open to negotiation based on the overall compensation package
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Q1. Basic questions from Swift
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Q1. Basic technical knowledge question
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Q2. Android related questions
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Q1. Communication skill
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Q2. Salary regarding questions
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Q1. Explain App Life Cycle
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App Life Cycle refers to the sequence of events that occur from the time an app is launched until it is terminated.
• App is launched by user or system

• App enters foreground and becomes active

• App enters background when user switches to another app or locks the device

• App may be terminated by the system to free up resources

• App can be brought back to foreground by user or system events
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Q2. Extension of enum
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Extension of enum allows adding new cases, computed properties, and methods to an existing enum type.
• Extensions can be used to add new functionality to existing enum types without modifying their original implementation.

• New cases, computed properties, and methods can be added to an enum using extensions.

• Extensions can also be used to conform an enum to a protocol.
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Q3. Grand central dispatch
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Q4. Delegate methods of URL session
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Delegate methods of URL session are used to handle various events during network requests.
• Delegate methods are used to handle authentication challenges, background session events, and data tasks.

• Examples include URLSessionDelegate, URLSessionDataDelegate, URLSessionTaskDelegate.

• Delegate methods can be used to handle redirects, caching policies, and response validation.
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Q5. SSL Pinning. How to achieve?
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SSL pinning is a security measure used to prevent man-in-the-middle attacks by validating the server's SSL certificate.
• Implement SSL pinning by embedding the server's SSL certificate within the app's code.

• During the SSL handshake, compare the server's certificate with the embedded certificate to ensure they match.

• If the certificates match, the connection is considered secure and the data exchange can proceed.

• SSL pinnin...read more
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Easy aptitude english and logical reasoning.

Q1. Tell me About yourself
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Q2. Swift advantages and disadvantages
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Swift is a powerful and modern programming language for iOS development, but it has its own set of advantages and disadvantages.
• Advantages: faster performance, safer code with optionals, easier to read and write code, interoperability with Objective-C

• Disadvantages: steep learning curve for beginners, limited community support compared to other languages like Java or Python
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Q1. Salary expectation and current salary
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Q1. Lifecycle of the Activity
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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. Difference between commit( ) and apply( ) in SharedPreferences?
Ans. 
commit() writes the changes synchronously, apply() writes the changes asynchronously.
• commit() returns a boolean value indicating success or failure, while apply() does not.

• commit() writes the changes immediately to the disk, while apply() writes the changes to the memory first and then to the disk asynchronously.

• apply() is faster than commit() as it writes the changes in the background thread.

• Use commit() when you need...read more
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Q2. Difference between Alpha and Beta testing?
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Alpha testing is done by internal teams before release, while beta testing is done by external users after alpha testing.
• Alpha testing is done by internal teams to identify bugs and issues before releasing the software to the public.

• Beta testing is done by external users who are not part of the development team to gather feedback and identify any remaining issues.

• Alpha testing is usually done in a controlled environmen...read more
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Q3. What is Product Flavour?
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Product Flavour is a feature in Android development that allows you to create different versions of your app with different configurations.
• Product Flavours are used to create different versions of an app for different purposes or target audiences.

• Each Product Flavour can have its own unique code, resources, and configurations.

• Product Flavours are defined in the build.gradle file of an Android project.

• Examples of Produc...read more
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Q4. Can we use Activity without XML?
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Yes, we can use Activity without XML by programmatically creating the UI elements.
• Activities can be created and managed entirely in code without using XML layouts.

• UI elements can be added to the activity using Java code.

• This approach is useful for creating dynamic UIs or for cases where XML layouts are not suitable.
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Q5. Can we downgrade the app from PlayStore?
Ans. 
Yes, users can downgrade an app from PlayStore by uninstalling the current version and installing an older version manually.
• Users can uninstall the current version of the app from their device.

• They can then search for the older version of the app APK file online or use a backup they may have.

• After downloading the older version APK, they can manually install it on their device.
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