10+ Belmaks metal india Limited unit 1 Interview Questions and Answers

Intent is a messaging object used to request an action from another app component. There are two types of intents: explicit and implicit.

• Intent is used to start an activity, service, or broadcast receiver.

• Explicit intent specifies the component to be invoked by its name.

• Implicit intent specifies the action to be performed and optionally, the data to be used.

• Examples of implicit intents are opening a webpage or making a phone call.

• Examples of explicit intents are launching a s...read more

Activity and Fragment life cycles are a series of states that an Android component goes through during its lifetime.

• Activity life cycle includes onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy() methods.

• Fragment life cycle includes onAttach(), onCreate(), onCreateView(), onActivityCreated(), onStart(), onResume(), onPause(), onStop(), onDestroyView(), and onDetach() methods.

• Both life cycles are important for managing the state of the component and ensuri...read more

ArrayList is a resizable array while HashMap is a key-value pair collection.

• ArrayList is ordered while HashMap is unordered

• ArrayList allows duplicate values while HashMap does not

• HashMap provides faster access to elements using keys

• Use ArrayList when you need to maintain the order of elements

• Use HashMap when you need to access elements using keys

SDK stands for Software Development Kit. It is a set of tools and resources used for developing applications for a specific platform.

• SDK provides developers with APIs, libraries, and documentation to build applications for a specific platform.

• Android SDK includes tools like Android Studio, ADB, and Emulator.

• SDK helps developers to test, debug, and optimize their applications.

• SDK also provides sample code and templates to help developers get started quickly.

Java is a high-level, object-oriented programming language used for developing desktop, web, and mobile applications.

• Java is platform-independent and can run on any operating system.

• It is statically typed, meaning that variables must be declared before use.

• Java is used for developing Android applications, enterprise applications, and web applications.

• It is known for its security features, such as the Java Security Manager and the sandbox environment.

• Java has a large and activ...read more

Activity is a single screen with a user interface, while fragments are a portion of the user interface in an activity.

• Activity is a standalone component that can be launched by an application.

• Fragments are reusable components that can be used in multiple activities.

• An activity can contain multiple fragments.

• Fragments have their own lifecycle and can be added or removed dynamically.

• Example: A music player app can have an activity for the playlist and fragments for the currentl...read more

Signed APK is a single file that is signed and ready for distribution, while bundle is a publishing format that includes multiple APKs optimized for different device configurations.

• Signed APK is generated from a single APK file, while bundle generates multiple APKs.

• Signed APK is signed with a private key, while bundle is signed with an upload key.

• Bundle includes multiple APKs optimized for different device configurations, while signed APK is not optimized.

• Bundle reduces app s...read more

Retrofit and Volley are popular networking libraries for Android development.

• Retrofit is a type-safe HTTP client for Android and Java.

• Volley is a fast and efficient networking library for Android.

• Retrofit uses annotations to define API endpoints and request parameters.

• Volley provides easy-to-use APIs for making network requests and handling responses.

• Retrofit is best suited for RESTful APIs, while Volley is more versatile and can handle various types of requests.

• Both librarie...read more

Modules are independent units of code that can be used to build larger software systems.

• Modules can be reused in different projects

• They can be developed and tested independently

• Modules can be combined to form a larger system

• Examples include libraries, plugins, and frameworks

Firebase Notification is a cloud messaging service provided by Google.

• Firebase Notification allows developers to send messages and notifications to their app users.

• It supports both Android and iOS platforms.

• It provides a console to send notifications to specific devices or topics.

• It also supports sending notifications based on user behavior and location.

• Firebase Notification can be integrated with other Firebase services like Analytics and Cloud Messaging.

Types of access controls in iOS include public, internal, private, and fileprivate.

• Public: Accessible from anywhere, both within the module and outside.

• Internal: Accessible from anywhere within the module.

• Private: Accessible only within the defining type.

• Fileprivate: Accessible only within the same file.

Oops concept in java

• Object-oriented programming paradigm

• Encapsulation, Inheritance, Polymorphism, Abstraction

• Classes and Objects

• Access Modifiers

• Interfaces and Abstract Classes

The app life cycle in iOS refers to the sequence of events that occur from the time an app is launched to when it is terminated.

• The app is launched by the user or system.

• The app enters the foreground and becomes active.

• The app can enter the background when the user switches to another app or the device locks.

• The app can be terminated by the user or system.

• The app can also be suspended, where it remains in memory but does not execute code.

• Examples: launching an app, switching ...read more

Classes are reference types, while structs are value types in Swift.

• Classes are reference types, meaning they are passed by reference. Changes made to one instance will affect all references to that instance.

• Structs are value types, meaning they are passed by value. Each instance has its own copy, so changes made to one instance do not affect others.

• Classes support inheritance, while structs do not.

• Classes have deinitializers, while structs do not.

• Example: class Person { var ...read more

Protocol is a set of methods and properties that a class, struct, or enum can implement to define a particular functionality.

• Protocols define a blueprint of methods, properties, and other requirements that a class or struct must adhere to.

• They are similar to interfaces in other programming languages.

• Classes, structs, and enums can adopt protocols by conforming to them.

• Protocols allow for polymorphism and code reuse in Swift.

• Example: 'Equatable' protocol defines the '==' opera...read more

A closure is a self-contained block of code that can be passed around and used in your code.

• Closures capture and store references to any constants and variables from the context in which they are defined.

• Closures are similar to blocks in Objective-C and lambdas in other programming languages.

• Closures can be used to pass functions as arguments to other functions.

• Example: { (parameters) -> return type in code }

Generics allow you to write flexible, reusable functions and data types that can work with any type.

• Generics enable you to write functions and data types that can work with any type.

• They help in writing flexible and reusable code.

• Example: Array can hold elements of any type T.