Top Android Interview Questions and Answers-3

Welcome to part-3 of our Top Android Interview Questions and Answers series.
Hope you are preparing well for the next level of interview preparation.
You will learn more in this Part-3.
In this section, we have come up with more questions and answers.

Let’s continue our journey towards interview success!

What is the difference between a Service and an IntentService in Android?

Answer: A Service is a component in Android that runs in the background to perform long-running operations, such as playing music or downloading files. An IntentService is a subclass of Service that automatically handles incoming intents on a separate worker thread. IntentService is useful for performing background tasks without the need for explicit thread management.

What is the Android Notification system?

Answer: The Android Notification system is a way for an application to alert the user to events that have occurred in the background. Notifications can include text, icons, and sounds, and can be expanded to show additional information. Users can interact with notifications by tapping on them to launch the associated application.

What is the purpose of an Android Broadcast Receiver?

Answer: An Android Broadcast Receiver is a component that listens for system-wide broadcast events and performs actions in response. Broadcast Receivers can be used to receive events such as device booting, network connectivity changes, and battery level changes.

What is a Fragment in Android?

Answer: A Fragment is a modular section of an Android activity that can be combined with other fragments to create a flexible and responsive user interface. Fragments are useful for adapting an application’s user interface to different screen sizes and orientations.

What is the purpose of the Android Support Library?

Answer: The Android Support Library is a collection of libraries that provide backward compatibility for new Android features on older Android devices. The Support Library includes features such as Fragments, RecyclerViews, and ViewPager, which are not available on older versions of Android.

What is the purpose of the Android Manifest file?

Answer: The Android Manifest file is an XML file that contains information about an Android application, including its package name, version code and name, permissions, and components such as activities, services, and broadcast receivers. The manifest file is used by the Android system to determine the application’s identity and the permissions it requires.

What is the Android Application class?

Answer: The Android Application class is a base class for an application’s global state, providing a place to store and manage global resources, such as singletons and shared preferences. It is instantiated before any other class when the application starts and can be used to perform initialization tasks that need to be done once during the application’s lifetime.

What is the difference between a ViewGroup and a View in Android?

Answer: A View is a basic building block of an Android application’s user interface, representing a single UI element, such as a button or text field. A ViewGroup is a container for Views, allowing multiple Views to be combined into a single layout. ViewGroup subclasses, such as LinearLayout and RelativeLayout, provide additional layout functionality, such as positioning and sizing Views.

What is the purpose of the Android Resource system?

Answer: The Android Resource system is used to manage application resources, such as images, layouts, strings, and styles. Resources are organized into directories by type and are automatically compiled into the application’s binary format. The Resource system provides a way to separate application content from code, making it easier to maintain and update.

What is an Android Service?

Answer: An Android Service is a component that runs in the background to perform long-running operations, such as playing music or downloading files. Services can be started and stopped, and can run either in the foreground or the background. They are useful for performing tasks that should continue even when the application is not in the foreground.

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