Android Team Lead

Android Team Lead Interview Questions and Answers

Updated 22 Feb 2023

Q1. Explain Clean Architecture, how it works?

Ans.

Clean Architecture is a software design principle that separates concerns and promotes testability, maintainability, and scalability.

Clean Architecture emphasizes separation of concerns by dividing the codebase into layers: Presentation, Domain, and Data.
Each layer has its own responsibilities and dependencies flow inward, ensuring loose coupling and high cohesion.
The Presentation layer handles user interactions and UI components.
The Domain layer contains business logic and u...read more

Ans.

Code can be verified before compile time using static code analysis tools.

Static code analysis tools can detect potential bugs, security vulnerabilities, and coding errors before compilation.
Examples of static code analysis tools include SonarQube, Checkstyle, and PMD.
These tools can be integrated into the development process to ensure code quality and reduce the risk of errors.
Static code analysis can also help enforce coding standards and best practices.
Regular use of stati...read more

Ans.

Co-routines are lightweight because they are non-blocking and do not require a separate thread.

Co-routines are cooperative, meaning they can pause and resume execution without blocking the thread.
They use fewer resources than threads because they do not require a separate stack or context switch.
Co-routines can be used to perform asynchronous operations without the overhead of creating and managing threads.
Example: In Android, co-routines can be used to perform network reques...read more

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Sealed classes are used to restrict inheritance and provide a fixed set of subclasses.

Sealed classes are used when we want to restrict the number of subclasses that can be created.
They are useful when we have a fixed set of subclasses and we want to ensure that no other subclasses are created.
Sealed classes can be used in conjunction with when expressions to provide exhaustive pattern matching.
They are commonly used in Kotlin's own standard library, such as the Result class.

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Ans.

Sub components and qualifiers are used in Dagger 2 for modularization and dependency injection.

Sub components allow for modularization of dependencies within a larger component.
Qualifiers are used to differentiate between multiple dependencies of the same type.
Sub components are created using the @Subcomponent annotation.
Qualifiers are created using custom annotations with @Qualifier.
Example: @Named("example") String exampleString;
Example: @Subcomponent(modules = {ExampleModu...read more

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MVVM is a design pattern that separates UI from business logic. LiveData is a data holder class that is lifecycle-aware.

MVVM stands for Model-View-ViewModel
Model represents the data and business logic
View represents the UI
ViewModel acts as a mediator between Model and View
LiveData is an observable data holder class
LiveData is lifecycle-aware and only updates the UI when the app is in the foreground
LiveData automatically manages the lifecycle of the data
LiveData can be used to...read more