PowerSchool India Senior Software Engineer 1 Interview Questions and Answers

onPause() and onStop() methods are called when switching from activity A to B.

• onPause() method is called when the activity is partially visible but still interactive.

• onStop() method is called when the activity is no longer visible to the user.

I have used three jetpack components in my previous projects.

• Used jetpack component A for implementing navigation in Android app

• Utilized jetpack component B for handling lifecycle events in ViewModel

• Integrated jetpack component C for data persistence using Room database

There are four main types of services available in Android: Foreground Service, Background Service, Bound Service, and Intent Service.

• Foreground Service: Runs in the foreground with a visible notification. Example: Music player.

• Background Service: Runs in the background without a user interface. Example: Location tracking service.

• Bound Service: Allows other components to bind to it and interact with it. Example: Music player service bound to a music player activity.

• Intent Ser...read more

A work manager is a tool used in software development to manage and schedule background tasks efficiently.

• Manages background tasks in a way that optimizes resources and improves performance

• Provides features like task prioritization, task chaining, and task cancellation

• Ensures tasks are executed in a timely manner and handles task failures gracefully

• Examples include Android WorkManager for managing background tasks in Android apps

View model will get destroyed when the associated activity or fragment is destroyed.

• View model will get destroyed when the activity or fragment is finished or destroyed.

• If the activity is recreated due to configuration changes like screen rotation, the view model will be recreated as well.

• View model can also be explicitly cleared by calling ViewModel.clear() method.

I have used GitFlow and feature branch strategies in previous projects.

• Utilized GitFlow branching model for managing feature development and releases

• Created feature branches for each new feature or bug fix

• Merged feature branches back into development branch after code review and testing

• Used tags to mark releases in the master branch

Clean architecture is a software design approach that separates concerns and enforces a clear separation of layers.

• Clean architecture focuses on separating business logic from implementation details.

• It promotes testability, maintainability, and scalability of the software.

• Common components in clean architecture include entities, use cases, and interfaces.

• Examples of clean architecture patterns include Hexagonal Architecture and Onion Architecture.

Android architecture components are a collection of libraries that help you design robust, testable, and maintainable apps.

• Android architecture components include LiveData, ViewModel, Room, and WorkManager.

• LiveData is an observable data holder class that is lifecycle-aware.

• ViewModel provides data to the UI and survives configuration changes.

• Room is a SQLite object mapping library that provides an abstraction layer over SQLite.

• WorkManager is used for managing deferrable, async...read more