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Android interview questions

Android interview questions.

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  • 1.

    Mention the difference between RelativeLayout and LinearLayout?

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  • 2.

    What is the difference between Bitmap and Drawable in Android?

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  • 3.

    What is a difference between Spannable and String?

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  • 4.

    What is an Activity?

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  • 5.

    Why is it recommended to use only the default constructor to create a Fragment?

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  • 6.

    How to persist data in an Android app?

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  • 7.

    Explain briefly all the Android application components

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  • 8.

    How do I pass data between Activities in Android application?

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  • 9.

    What is Dalvik?

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  • 10.

    Explain activity lifecycle

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  • 11.

    What is an AsyncTask?

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  • 12.

    Explain the build process in Android

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  • 13.

    What is ADB and what is it used for?

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  • 14.

    What’s the difference between onCreate() and onStart()?

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  • 15.

    In what situation should one use RecyclerView over ListView?

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  • 16.

    What is View Group? How are they different from Views?

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  • 17.

    How can I get the context in a fragment?

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  • 18.

    What is Armv7?

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  • 19.

    What is the Dalvik Virtual Machine?

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  • 20.

    How does the OutOfMemory happens?

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  • 21.

    What is an Intent in Android?

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  • 22.

    Tell about Constraint Layout

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  • 23.

    What is a ContentProvider and what is it typically used for?

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  • 24.

    What types of Context do you know?

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  • 25.

    Explain Android notification system

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  • 26.

    What is the most appropriate way to store user settings in Android application?

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  • 27.

    What is 'Context' on Android?

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  • 28.

    Is it possible to implement the model–view–controller pattern in Java for Android?

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  • 29.

    What are the differences between ArrayList and ArrayMap?

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  • 30.

    What is the difference between Handler vs AsyncTask vs Thread?

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  • 31.

    What is the difference between Service & Intent Service?

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  • 32.

    What is DDMS and what can you do with it?

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  • 33.

    What does LayoutInflater in Android do?

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  • 34.

    What are Android Annotations and what are they used for?

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  • 35.

    What is Intent Filter?

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  • 36.

    Explain String vs StringBuilder vs SpannedString vs SpannableString vs SpannableStringBuilder vs CharSequence

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  • 37.

    How would you communicate between two Fragments?

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  • 38.

    What is ART?

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  • 39.

    What are retained fragments?

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  • 40.

    When to use Android's ArrayMap instead of a HashMap?

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  • 41.

    How can two distinct Android apps interact?

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  • 42.

    Why fragments, and when to use fragments instead of activities?

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  • 43.

    What is Explicit Intent?

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  • 44.

    What is Implicit Intent?

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  • 45.

    What is the difference between compileSdkVersion and targetSdkVersion?

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  • 46.

    What is Parcelable in Android?

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  • 47.

    What is the support library? Why was it introduced?

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  • 48.

    When to use Android Loaders?

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  • 49.

    Isn't android's Bundle functionally equivalent with a Map?

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  • 50.

    What is the difference between invisible and gone for the View visibility status?

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  • 51.

    How could you pass data between activities without Intent?

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  • 52.

    How to declare global variables in Android?

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  • 53.

    What is the difference between onCreate() and onCreateView() lifecycle methods in Fragment?

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  • 54.

    What is a JobScheduler?

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  • 55.

    When to use Fragments vs Activities?

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  • 56.

    What is Handler and what is it used for?

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  • 57.

    What is the difference between AsyncTask and Thread/Runnable?

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  • 58.

    Explain key differences between Service and IntentService

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  • 59.

    What is the difference between Activity and Context?

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  • 60.

    What is Android Data Binding?

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  • 61.

    What are the permission protection levels in Android?

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  • 62.

    Describe Different Types of Services in Android

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  • 63.

    What is the difference between ListView and RecyclerView?

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  • 64.

    What is the best way to update the screen periodically?

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  • 65.

    What is an Android PendingIntent?

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  • 66.

    Android Log.v(), Log.d(), Log.i(), Log.w(), Log.e(). When to use each one?

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  • 67.

    What are dex files are used for?

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  • 68.

    What is RenderScript and when should we (really) use it?

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  • 69.

    Explain how HashMap works

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  • 70.

    How would you preserve Activity state during a screen rotation?

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  • 71.

    What is a LocalBroadcastManager?

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  • 72.

    What are the differences between onCreate(), onCreateView(), and onActivityCreated() in fragments and what would they each be used for?

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  • 73.

    What is the actual differences between a activity context and application context?

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  • 74.

    What is the difference between a Bundle and an Intent?

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  • 75.

    What is the ViewHolder pattern? Why should we use it?

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  • 76.

    What is the difference between Adapter and Loader in Android?

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  • 77.

    How would you support different screen sizes?

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  • 78.

    Discuss Singletons vs. Application Context for app-global state

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  • 79.

    What are some best practices to avoid memory leaks on Android?

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  • 80.

    What is Broadcast Receiver?

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  • 81.

    What is the difference between getContext() , getApplicationContext() , getBaseContext() , and "this"?

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  • 82.

    What are best practices for storing and protecting private API keys in applications?

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  • 83.

    Explain how ArrayMap works

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  • 84.

    When to use SparseArray vs HashMap?

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  • 85.

    What is AIDL?

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  • 86.

    How do you handle Bitmaps in Android as it takes too much memory?

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  • 87.

    What are some differences between ART and Dalvik?

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  • 88.

    How to avoid reverse engineering of an APK file?

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  • 89.

    When is it necessary, or better to use a SurfaceView instead of a View?

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  • 90.

    Is a Dalvik virtual machine instance created for each application?

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  • 91.

    What is a Sticky Broadcast?

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  • 92.

    What is the difference between ANR and crash in Android?

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  • 93.

    What is the Android NDK? How can one use it? Why should one use it?

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  • 94.

    What is Doze? What about App Standby?

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  • 95.

    What is the StrictMode?

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  • 96.

    What are Android Architecture Components?

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  • 97.

    Can you manually call the Garbage collector?

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  • 98.

    Why to consider FlatBuffers over JSON?

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  • 99.

    What are some difference between Parcelable and Serializable?

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  • 100.

    What is the difference between Android timer and a Handler to do action every N seconds?

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  • 101.

    What is the difference between ArrayMap vs HashMap?

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  • 102.

    Provide some tips to reduce battery usage in an android application

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  • 103.

    What is a ThreadPool? And is it more effective than using several separate Threads?

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  • 104.

    What is the relationship between Looper, Handler and MessageQueue in Android?

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  • 105.

    What is the difference between Local, Normal, Ordered and Sticky broadcasts?

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  • 106.

    What is Intent vs Sticky Intent vs Pending Intent?

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  • 107.

    What happens if the user navigates away or closes the app while I still have a reference to the Activity the user just closed in my AsyncTask?

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  • 108.

    Explain when would you call getApplicationContext() and why?

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  • 109.

    Explain reasons why not to use getApplicationContext()?

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  • 110.

    When to use AIDL vs Messenger Queue?

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  • 111.

    What is the onTrimMemory method?

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  • 112.

    When would you use AIDL?

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  • 113.

    How can I use AsyncTask in different Activities?

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