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Android Interview Questions and Answers

By Umesh Singh
Last update: 21 Jun 2020, 33 Questions
Android Interview Questions

Android is a most popular mobile operating system which is not only used in mobile phone but on TV, cars, and smartwatches as well. Speaking of mobile phones, the primary function of android is to give the command to mobile applications to do the task. It’s like if you want to dial a number than android indicates Mobile to dial it. These Android Interview Questions are specially curated highly experienced industry professionals to help candidates in their future job success.

Same way, if you want to play games on the Android platform, then it’s android which gives the command to gaming application to perform accordingly. Android OS is mainly coded in Java language. All along, it is also written in other languages such as C and C++. Currently, Android could be used in more than 100 words.

Advantages
  • Multitasking is one of the main benefits of Android. You could listen to songs along with an Internet browsering on Android.
  • Access to hundreds of thousands of applications. You want to learn cooking, find the cooking app and start your learning.
  • An android user has many options for phones, and it's branding, which is available in the different price range. So, there is a variety of choices with Android.

Here below, we are mentioning a set of crucial Android interview questions best suited for experienced professionals as freshers to this niche.

Most Frequently Asked Android Interview Questions

1. What is Android? Explain

It is an open-source, Linux-based operating system which is used in mobile, phones, tablets, televisions, etc.

3. What does ADB stands for & what is it’s primary function?

Android Debug Bridge is the full form of ADB. ADB could control sharing of files along with cut & copy function of any PC from your system with the help of a USB.

4. What do you mean by ANR in Android ?

ANR stands for Application Not Responding. This pop-up comes when any application gets extra load , due to which it becomes unresponsive to open.

6. Should we change the name of a file after installing?

We should never change it as it could bring few errors in working of the application.

7. Write down the syntax to get a view element in the program?

[Android.Runtime.Register("findViewById", "(I)Landroid/view/View;",
"GetFindViewById_IHandler")]
public virtual View FindViewById (Int32 id)

8. Kindly name few of the last code given to android different versions?

Nougat, Marshmallow, Lollipop, KitKat, Jelly Bean, Ice Cream, Sandwitch & Honeycomb are the few of the last codes used for android versions .

9. What do you mean by intent in Android ?

Intent is sort of Instruction or information which is given to the components. Such as opening of any game, online page , send email & so on. Intent is further divided into 2 parts, which are Implicit & Explicit Intent.

10. Could you point out some of the prime advantages of Android?
  • Multitasking is one of the main advantage of android. You could listen songs along with Internet browsing on android.
  • Access to hundred of thousands applications. You want to learn cooking , just find cooking app and start your learning.
  • An android user has many options of phones and it's brands, which are available in different price range. So, there is variety of choices with android.
11. How could we move the data in sub activity?

Data could be moved from one activity to another with the help of bundles.
To know the coding, refer below :

Example

                                                    

Bundle b=new Bundle();
b.putString(“Email”, “[email protected]”);
i.putExtras(b); //where I is intent

12. What is an Android Virtual Device?

An Android Virtual Device is a device configuration that is run with the Android emulator. Android virtual device is used to test an application without any mobile or a tablet. It works on Android Emulator which gives a virtual device facilities. It gives the platform to install & run the application in order to test it.

13. What do you understand with an activity in Android?

An activity of android is a frame or a screen of any application. Any app, could create more than one activity . It’s like when we start any application its shows one activity , when we pause it displays panother activity & go on same way .

14. What is an android toast ?

An android toast is a form of message, which reflect for a user in terms of feedback. This message reflect for a very short time & goes away automatically.

Example

                                                    

Toast.makeText(getApplicationContext(),"Best Interview Questions",Toast.LENGTH_SHORT).show();

15. What are the storage facilities available on android?

Internal storage is the main facility given by android which is Internally based in device . Android also support external storage which could be done in the form of USB or Pen drive . Apart from internal and external storage , Android gives the facility of shared preferences and network connection for storage . Adding to this , SQLite database stores data in the form of text file & which is made for mobile devices .

16. Define fragment in Android?

Fragment is a section of an activity & usually called as sub - activity. Fragment functions in creating modular activity which enables multiple screen in a same time.

17. What do you understand by ANR dialogue box?

ANR stands for Application not responding . This dialogue box appears when any application is no longer working .

18. How could you show icon of an activity in manifest file?

<activity android:icon="@drawable/app_icon" android:name=".MyTestActivity"></activity>

To show icon in manifest file , open the ‘manifest’ & click on ‘AndroidManifest.xml’ . There we would find Application node . Just add the above code in application .

19. What do you mean by Android SDK?

Android SDK is tool for app developers to create app for google. SDK performs the necessary actions of app development like debugging & testing.

20. Could you name a few key components of Android?

Key components of android includes view, intent, service, activity, fragment, content provider & android virtual device.

21. How to mention an activity in manifest file?

<manifest></manifest>
<application></application>
<activity android:name="”.MyIntellipaat”"> </activity>

22. How android is beneficial for app. developers?

Android is one of the most popular mobile platform today in the world. App. developer just needs to create and register his app on android platform. After this, any android user from across the globe could download and install his application. By just having presence on android platform, an app. developer gets huge market of ready customers.

23. What is the core work of intent filter?

The basic function of intent is to identify & select the type of intent for any component.

24. Specify key disadvantages of android?
  • Many android apps contain viruses, which destroys a mobile health.
  • Android needs internet to perform any task. It is of no use for a person not having an internet connection.
  • You couldn't work in flow on android as bulk advertising stops you every time.
25. In Android, how to insert swipe animation?

<set xmlns:android="http://schemas.android.com/apk/res/android" android:shareInterpolator=”false”>
<translate android:fromXDelta=”-100%”
android:toXDelta=”0%”
android:fromYDelta=”0%”
android:toYDelta=”0%”
android:duration=”700"/>
</set>

26. What do you mean by Service in Android?

A service in Android is a component which runs in the background even when the application is demolished.

27. What do you mean by ActivityCreator?

It is a batch file and shell script which was used to create a new Android project. It is now replaced with "Create New Project" in Android SDK.

28. Lists life cycle methods of android activity?
  • onCreate()
  • onStart()
  • onResume()
  • onPause()
  • onStop()
  • onRestart()
  • onDestroy()
29. Why we use LINUX ID in android?

A unique Linux ID is assigned to each application in android and it is used for the tracking of a process.

30. Explain the Android Application Architecture?

It has following application components architecture.

  • Services
  • Intent
  • Resource Externalization
  • Notification
  • Content Providers
31. What do you mean by adb?

Adb stands for Android Debug Bridge. It helps developers the power to execute remote shell commands. It's basic function is to allow and control communication towards and from the emulator port.

32. What do you mean AIDL? AIDL stands for Android Interface Definition Language. It handles the interface requirements between a client and a service so both can communicate at the same level through interprocess communication.
33. What is the use of content provider?

It is used to share information between Android applications.

Development History

Android Inc. creates an android, but Google later bought it in 2005. Currently, Android is lead by Google in Open Handset Alliance (OHA). OHA contains 84 companies around the globe, which could use the Android platform in their products.

Latest Version: Android 11.0 is the latest till date which was released on February 19, 2020