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30+ Android Interview Questions And Answers

Android is a widely-used operating system for mobile devices like smartphones and tablets. It's known for its versatility and ability to support numerous applications, making it a popular choice for developers. Understanding Android's core concepts, frameworks, and development tools is essential for creating effective apps. Preparing for an Android interview includes knowing a range of questions from fundamental to advanced concepts, involving both theory and practical coding.


Most asked Android interview questions



What is an Activity in Android?

An Activity is a single, focused thing that a user can do. It's a crucial component of an Android app, which usually corresponds to one screen's user interface.


What is an Intent?

An Intent is a messaging object used to request an action from another app component.


What is the use of the manifest file in an Android application?

The manifest file (AndroidManifest.xml) declares app's package name, components, permissions, minimum level of Android API, and other app metadata.


Guess what does this code snippet do?

Intent intent = new Intent(MainActivity.this, SecondActivity.class); startActivity(intent);

This code starts a new Activity called SecondActivity.


What is a Service in Android?

A Service is an application component that can perform long-running operations in the background without a user interface.


What data types are supported by bundles in Android?

Bundles support various data types like String, int, boolean, and Serializable objects.


What is an AsyncTask?

AsyncTask allows us to perform background operations and publish results on the UI thread without handling threads manually.


What is a BroadcastReceiver?

A BroadcastReceiver is a component that responds to system-wide broadcast announcements.


What are the four main components of an Android application?

The four main components are Activities, Services, BroadcastReceivers, and ContentProviders.


Explain the Android application Architecture.

Android application architecture has several layers: Linux Kernel, Libraries, Android Runtime, Application Framework, and Applications.


What is a Fragment?

A Fragment represents a portion of UI in an Activity. Multiple fragments can be combined in a single activity to build a multi-pane UI.


How do you pass data between Activities in Android?

Data between Activities can be passed using Intents with extras.


What is the Android SDK?

The Android SDK (Software Development Kit) provides the libraries and tools needed to build, test, and debug apps for Android.


How would you update the UI from a background thread?

You can update the UI from a background thread using handlers or by invoking runOnUiThread() method.


What is the difference between a file-based persistence and a SharedPreferences based persistence in Android?

File-based persistence stores data in a file in the filesystem, while SharedPreferences stores data in XML files with key-value pairs for small, simple datasets.

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Explain the Android activity lifecycle.

The activity lifecycle includes callbacks like onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy() that allow you to know the current state of the activity and manage resources accordingly.


What different types of Broadcasts are available in Android?

Android supports Normal, Ordered, Sticky, and Local broadcasts.


How does the fragment lifecycle differ from the activity lifecycle?

Fragments have additional lifecycle methods such as onAttach(), onCreateView(), and onDetach() that handle their unique relationship with their host activity.


What is a Content Provider?

A Content Provider manages access to a structured set of data, allowing data sharing between different applications.


Explain the concept of Intent Filters.

Intent Filters declare the capabilities of a component, allowing it to respond to intents from other apps.


Describe how to implement a custom View in Android.

To create a custom View, extend a View class and override the onDraw() method to render your component.


What is a Loader?

A Loader, like AsyncTaskLoader, is used to load data asynchronously and manage data across Activity or Fragment lifecycle changes.


What is a View in Android and how is it different from a ViewGroup?

A View is a UI element, such as a button or text field, while a ViewGroup is a container that holds Views and defines their layout.


What does this code sample demonstrate?

binding.textView.setOnClickListener { view -> /* handle click */ }

This code sets an OnClickListener to a TextView using View Binding to handle click events.


How do you handle memory leaks in Android?

Memory leaks can be handled by avoiding long-lived references to Activity, ViewModel, using Context appropriately, and leveraging WeakReferences if necessary.


What are some common use cases for using JobScheduler?

JobScheduler is used to schedule tasks or work when certain conditions are met, such as device charging or connectivity.


What are the limitations of the Android Emulator?

The Emulator may not accurately imitate every device feature, such as cellular network, battery, or GPS, and it may also run slower than a real device.


Describe the ROOM library in Android.

ROOM is an abstraction layer over SQLite, providing a more robust database access mechanism while harnessing the full power of SQLite.


How is dependency injection useful in Android?

Dependency injection frameworks, like Dagger or Hilt, help manage class dependencies, thus making code more testable and maintainable.


What are Android Architecture Components and their benefits?

Architecture Components are a set of libraries that help you design robust, testable, and maintainable apps, such as ViewModel, LiveData, and Data Binding.


Android Interview Tips

Understanding the Question

  • Listen carefully to the question and ask for clarification if needed. It's crucial to understand what’s being asked before rushing to answer. If the question is complex, break it down into parts and tackle each one methodically. Avoiding misunderstanding the question can lead you to give a thorough and accurate answer.

Relevance to Your Experience

  • Connect your response to your relevant experience. Interviewers appreciate real-world examples that showcase your skills and expertise. Share specific challenges you encountered, actions you took, and the outcomes of those actions, emphasizing what you learned or how you improved a process.

Evaluating Code Questions

  • When faced with code challenges or questions, take a moment to evaluate the code before answering. Clarify any assumptions, run through the code in your mind, or write down a few key points before discussing it. This can help ensure you have correctly grasped the question and will provide a more detailed answer.

Keep Calm and Structure Your Thoughts

  • Stay calm and collected, even when faced with tough questions. Panic can lead to rambling or disjointed answers. If you need a moment to think, take it. Structuring your response with a clear beginning, middle, and end can help you convey your thoughts more coherently and give a well-rounded answer.

Admitting When You Don’t Know

  • It's okay to admit when you don't know the answer to a question. Honesty can go a long way. Instead of guessing and risking an incorrect answer, you can say you're not sure but are interested in learning more or explain how you would find the answer. This shows your problem-solving skills and eagerness to learn.


Where can I hire an Android Developer?

FireHire is your go-to destination for connecting with senior-level Android developers who are pre-vetted for their skill and reliability. Read more: Where can I hire an Android Developer?

How much does a freelance Android Developer cost?

The cost can range widely depending on experience and location but expect prices starting from $45/hour when you partner with FireHire. Read more: How much does a freelance Android Developer cost?

How much does an Android Developer consultant cost?

Consultant costs vary, but FireHire offers competitive rates starting at $45/hour, depending on the consultant's expertise and your project needs. Read more: How much does an Android Developer consultant cost?

Why using FireHire for hiring Android developers is the best choice?

With FireHire, you get access to a vast pool of top-tier talent, fast candidate sourcing, a risk-free hiring period, and the expertise you need to scale your tech team efficiently.

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