MedOnGo Android Developer Interview Questions and Answers

Q1. Explain Activity lifecycle
Ans. 
Activity lifecycle refers to the series of states an activity goes through during its lifetime in an Android app.
• Activity is created with onCreate() method

• Activity is started with onStart() method

• Activity is resumed with onResume() method

• Activity is paused with onPause() method

• Activity is stopped with onStop() method

• Activity is destroyed with onDestroy() method
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Q2. What is databinding
Ans. 
Data binding is a technique in software development that establishes a connection between the UI components and the data sources.
• Data binding allows for automatic synchronization of data between the UI and data sources.

• It reduces boilerplate code by eliminating the need for manual updates to the UI when data changes.

• Data binding can be implemented using frameworks like Android Data Binding Library.
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Q1. About interview process
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Q2. Discussion on Salary
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Q1. Basics of Android components
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Q1. About the past experience of Android apps which i have worked on.
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Q1. Normal salary discussion and relocation
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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. Encription and decription in swift
Ans. 
Encryption and decryption in Swift involves using cryptographic algorithms to encode and decode data securely.
• Use common encryption algorithms like AES or RSA for encryption.

• Implement encryption using libraries like CommonCrypto or CryptoSwift.

• Store encryption keys securely and use secure protocols for data transmission.

• Example: Encrypting a string using AES encryption in Swift.
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Q2. Keychain access in swift
Ans. 
Keychain access in Swift allows secure storage of sensitive information like passwords, tokens, etc.
• Use Keychain Services API to securely store and retrieve sensitive data.

• Keychain items are stored securely in the device's keychain and are encrypted.

• Access keychain items using unique identifiers called keys.

• Use Keychain Swift library for easier implementation.
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Q3. Class vs struct
Ans. 
Classes are reference types, while structs are value types in Swift.
• Classes are reference types, meaning they point to the same instance in memory when assigned to a new variable.

• Structs are value types, meaning they create a new copy when assigned to a new variable.

• Use classes for complex data structures or when you need inheritance, use structs for simple data types or when you want value semantics.

• Example: class Per...read more
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Q4. If let and guard let
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Q5. Grand central dispatch in swift
Ans. 
Grand Central Dispatch (GCD) is a technology in Swift for managing concurrent operations.
• GCD allows developers to perform tasks concurrently without having to manage threads manually.

• It provides a high-level API for managing tasks and executing them on different queues.

• Developers can use GCD to perform tasks in the background, update the UI on the main thread, and more.
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Q1. Singletone, multithreading, oops
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Q1. Explain Activity lifecycle
Ans. 
Activity lifecycle refers to the series of states an activity goes through during its lifetime in an Android app.
• Activity is created with onCreate() method

• Activity is started with onStart() method

• Activity is resumed with onResume() method

• Activity is paused with onPause() method

• Activity is stopped with onStop() method

• Activity is destroyed with onDestroy() method
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Q2. What is databinding
Ans. 
Data binding is a technique in software development that establishes a connection between the UI components and the data sources.
• Data binding allows for automatic synchronization of data between the UI and data sources.

• It reduces boilerplate code by eliminating the need for manual updates to the UI when data changes.

• Data binding can be implemented using frameworks like Android Data Binding Library.
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Q1. About interview process
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Q2. Discussion on Salary
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Assignment conducted