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Android

100 Android interview questions

Only coding challenges
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Android Fundamentals


  • 1.

    What is Android, and how is it different from other mobile operating systems?

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  • 2.

    What programming languages can you use to develop Android applications?

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  • 3.

    Explain the Android application architecture.

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  • 4.

    Describe the Android application lifecycle.

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  • 5.

    What is an Activity in Android, and what is its lifecycle?

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  • 6.

    What are Intents, and how are they used in Android?

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  • 7.

    Explain the concept of Services in Android.

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  • 8.

    Define a Broadcast Receiver and its use in Android apps.

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  • 9.

    What are Content Providers, and when should you use them?

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  • 10.

    What file holds the application’s AndroidManifest.xml in an Android project?

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  • 11.

    How does the view system work in Android?

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  • 12.

    What is the difference between a File, a Class, and an Activity in Android?

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  • 13.

    What is the Dalvik Virtual Machine?

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  • 14.

    What is an APK file in Android?

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  • 15.

    How do you manage memory in Android applications?

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Android UI/UX


  • 16.

    What are the different types of Layouts available in Android?

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  • 17.

    Explain the role of Adapters in Android.

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  • 18.

    How do you create custom Views and custom Layouts?

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  • 19.

    What is the design pattern that Android’s UI architecture follows?

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  • 20.

    Discuss the differences between a Fragment and an Activity.

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  • 21.

    Explain the concept of the Android Application UI thread.

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  • 22.

    What are “dp”, “dip”, “sp”, “px” and when to use each?

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  • 23.

    How do you handle screen orientation changes in Android?

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  • 24.

    How can you implement multi-screen support for different device sizes and densities?

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  • 25.

    What are Material Design principles in Android?

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Android Data Management


  • 26.

    What are SharedPreferences, and how do you use them?

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  • 27.

    How does the SQLite database work in Android?

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  • 28.

    Explain how to use Room Persistence Library for data management.

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  • 29.

    What is a Loader in Android?

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  • 30.

    Discuss how to use a ContentResolver in Android.

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  • 31.

    Can you use raw SQL queries in Android? How?

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  • 32.

    How do you handle data caching in Android applications?

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Android Networking


  • 33.

    Explain the HTTP networking stack used by Android.

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  • 34.

    What libraries are available in Android for networking operations?

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  • 35.

    How do you perform asynchronous network operations?

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  • 36.

    What is the use of the Volley library?

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  • 37.

    Explain the use of Retrofit in Android for API access.

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  • 38.

    How do you troubleshoot a slow network request in an Android application?

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  • 39.

    What is OkHttp, and why would you use it?

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Android Advanced Topics


  • 40.

    What is ProGuard, and why is it important in Android development?

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  • 41.

    Discuss Android NDK and its use cases.

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  • 42.

    What are some common use cases for using AsyncTask?

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  • 43.

    What are loaders, and why are they useful?

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  • 44.

    Explain the JobScheduler API.

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  • 45.

    How does the Doze feature affect background tasks and services?

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  • 46.

    What is a SurfaceView?

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  • 47.

    Discuss how you’d implement gesture detection in Android.

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Android Security


  • 48.

    How does Android secure the data and information within an application?

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  • 49.

    What is Android Keystore system?

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  • 50.

    What are the different protection levels in permission declaration?

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  • 51.

    How do you securely store sensitive information on Android?

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  • 52.

    What is HTTPS, and how do you implement it on Android?

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Android Testing


  • 53.

    Explain the Android testing framework.

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  • 54.

    What is Espresso, and how is it used for UI testing?

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  • 55.

    What is the difference between local tests and instrumentation tests?

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  • 56.

    How do you perform unit testing in Android?

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  • 57.

    What is Robolectric, and when would you use it?

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  • 58.

    Discuss UI Automator and its role in Android testing.

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Android Performance


  • 59.

    How can you improve the performance and responsiveness of an Android application?

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  • 60.

    What is the Android Profiler?

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  • 61.

    Describe the StrictMode tool.

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  • 62.

    What are some common causes of memory leaks in Android applications?

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  • 63.

    How do you diagnose and resolve ANRs (Application Not Responding)?

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  • 64.

    What practices should be followed to reduce APK size?

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Android App Components and Navigation


  • 65.

    What is a PendingIntent?

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  • 66.

    How do you implement a Navigation Drawer in Android?

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  • 67.

    What is the purpose of the android:launchMode attribute?

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  • 68.

    Describe the Android notification system.

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  • 69.

    How do you pass data between activities in Android?

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  • 70.

    What is the ViewModel and LiveData architecture components?

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Android Architecture


  • 71.

    What are the components of Android Architecture Components?

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  • 72.

    How would you describe a good app architecture?

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  • 73.

    What is the MVP (Model-View-Presenter) pattern?

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  • 74.

    What is MVVM (Model-View-ViewModel) in the context of Android?

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  • 75.

    Discuss the Repository pattern and its importance.

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Android Libraries and Frameworks


  • 76.

    What is the Android Support Library, and why is it important?

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  • 77.

    What is Data Binding, and how does it simplify development?

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  • 78.

    What is Dagger2, and what are the advantages of using it?

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  • 79.

    What are Android Jetpack components?

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  • 80.

    What is Koin and how does it differ from Dagger in dependency injection?

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Android OS and Compatibility


  • 81.

    How do you support different versions of Android with your application?

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  • 82.

    What is Android Jetpack’s role in supporting different devices and OS versions?

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  • 83.

    How do you handle deprecated methods or APIs?

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  • 84.

    Discuss multi-platform development for Android and other platforms.

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  • 85.

    How does Android’s ART differ from Dalvik?

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Android Best Practices


  • 86.

    What are key considerations for internationalizing and localizing an Android app?

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  • 87.

    Discuss accessibility in Android applications.

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  • 88.

    What are some best practices for code organization in Android?

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  • 89.

    Explain the principles of Clean Architecture in the context of Android.

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  • 90.

    How can you use MVVM to make an application more testable?

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Modern Android


  • 91.

    What are Android App Bundles (AAB)?

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  • 92.

    Discuss Kotlin and why it has become popular for Android development.

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  • 93.

    What are Coroutines in Kotlin, and how do they simplify asynchronous operations?

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  • 94.

    What is Jetpack Compose, and how does it change UI development on Android?

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  • 95.

    How does Android handle background processing with WorkManager?

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Android Third-Party Integrations


  • 96.

    How do you integrate with third-party services in Android?

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  • 97.

    What are the steps to include a Custom Font in an Android app?

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  • 98.

    Discuss integration of analytics tools like Firebase Analytics or Google Analytics.

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  • 99.

    How do you implement social media sharing in an Android application?

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  • 100.

    What considerations must be taken when integrating payment gateways into Android apps?

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