Deutsche Bank Interview Experience for FTE(2020)

Deutsche Bank recently visited our campus for recruitment of FTE as well as an internship. The whole process consisted of 1 coding round, 2 tech round, 1 profit round, and 1HR round.

**Coding Round: **The coding round had 3 questions which should be solved in 1.5 hr.

  • **Question 1: **It was a string manipulation question. Suppose input was string1, string2, and k seconds. We have to choose every i form 1 to k and shift a character from the string by i index (eg: if i=3 then ‘a’ would be shifted to ‘d’). Each i could be chosen only once. We need to check if we can convert string1 to string2. (20 marks)
Input: 
k=3
string1 = 'abc'
string2 = 'ddd'
Output: 
Yes
  • Question 2: Suppose at the first level of a tree a root node is always present. You are given an array count where count[i] denotes the number of nodes present at the ith level. We need to output the maximum diameter(number of edges in the longest path) possible for this tree. (50 marks)
Input:
cnt[]={2}
Output:
2
  • Question 3: A segment tree question. (50 marks)

15 students were selected for the interview. Most of the students selected for the interview had either solved all 3 questions or had good CPI and had solved 1.5/2 questions.

**Technical Round 1: **Initially, the interviewer asked me to introduce myself. He further asked what was my favorite data structure and algorithm to which I said heap and sorting. He asked me to list a few applications of the heap and what data structure I would use to store heap (ans: array for binary heap). Further, he asked me to explain the heap sort algorithm. Also, I was given an array, and he asked me to insert elements to a min-heap and show him the final structure formed. The coding questions asked me after this was:

  1. Kadane’s Algorithm 
  2. Dutch National Flag Algorithm
  3. Queue using two stacks and for a follow-up, question queue using a single stack.
  4. Find a loop in the linked list
  5. Stack using linked list
  6. InOrder, PostOrder, PreOrder Traversal of tree
  7. What is a binary search tree and perform deletion in a binary search tree.
  8. Bubble Sort Algorithm (along with its best, average and worst-case time complexity)
  9. He also asked me the time complexity for most of the questions.
  10. He asked me to explain the main difference between paging and segmentation, the difference between OSI model and TCP/IP model. Most of the basic concepts were covered by him.

Out of 15 students, 10 were selected for the next round.

**Technical Round 2: **The person who took my second interview was the VC(FX Settlements Technologist) of Deutsche Bank. He was quite friendly and nice.

He asked me to introduce myself. Further, he had a look at my resume and asked me about a DBMS project that I had mentioned. I explained to him the entire project and also my contribution to it. Based on my explanation he asked me to write 2 queries. Then he asked to explain about the project of my last internship. Since it was based on cryptography and involved a lot of math he asked 2 math-based puzzles.

  • **Puzzle 1: **Suppose there is a closed dark room and there are 5 hats in the room. 2 are red and 3 are blue. 3 women enter the room pick up any random hat wear it and come out. 2 women cannot see their own hat, but they can see the other women’s hat and the 3rd woman is blind. 2 women say that they cannot judge which colour hat they are wearing. The third woman after hearing this replies she exactly knows what colour hat she is wearing. We need to find what was the colour of the hat of the third women. (ans: blue)
  • **Puzzle 2: **The 3 & 5 Litre Die Hard Water Puzzle

He further asked me my favorite subject to which I replied DSA.

He asked me to find the number of times a given character occurs in a string and also the index. The twist here was to include any of the oops concepts in the implementation. (I used inheritance)

He also asked me a situational question. If I were leading a project and my best friend who is a part of the team stopped working for it, and we had a deadline of 1 month to complete the project, how would I handle the whole situation?

Out of 10 students, 8 were selected for the next round.

#interview experiences #deutsche bank #marketing #on-campus

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Deutsche Bank Interview Experience for FTE(2020)
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Citrix Bugs Allow Unauthenticated Code Injection, Data Theft

Multiple vulnerabilities in the Citrix Application Delivery Controller (ADC) and Gateway would allow code injection, information disclosure and denial of service, the networking vendor announced Tuesday. Four of the bugs are exploitable by an unauthenticated, remote attacker.

The Citrix products (formerly known as NetScaler ADC and Gateway) are used for application-aware traffic management and secure remote access, respectively, and are installed in at least 80,000 companies in 158 countries, according to a December assessment from Positive Technologies.

Other flaws announced Tuesday also affect Citrix SD-WAN WANOP appliances, models 4000-WO, 4100-WO, 5000-WO and 5100-WO.

Attacks on the management interface of the products could result in system compromise by an unauthenticated user on the management network; or system compromise through cross-site scripting (XSS). Attackers could also create a download link for the device which, if downloaded and then executed by an unauthenticated user on the management network, could result in the compromise of a local computer.

“Customers who have configured their systems in accordance with Citrix recommendations [i.e., to have this interface separated from the network and protected by a firewall] have significantly reduced their risk from attacks to the management interface,” according to the vendor.

Threat actors could also mount attacks on Virtual IPs (VIPs). VIPs, among other things, are used to provide users with a unique IP address for communicating with network resources for applications that do not allow multiple connections or users from the same IP address.

The VIP attacks include denial of service against either the Gateway or Authentication virtual servers by an unauthenticated user; or remote port scanning of the internal network by an authenticated Citrix Gateway user.

“Attackers can only discern whether a TLS connection is possible with the port and cannot communicate further with the end devices,” according to the critical Citrix advisory. “Customers who have not enabled either the Gateway or Authentication virtual servers are not at risk from attacks that are applicable to those servers. Other virtual servers e.g. load balancing and content switching virtual servers are not affected by these issues.”

A final vulnerability has been found in Citrix Gateway Plug-in for Linux that would allow a local logged-on user of a Linux system with that plug-in installed to elevate their privileges to an administrator account on that computer, the company said.

#vulnerabilities #adc #citrix #code injection #critical advisory #cve-2020-8187 #cve-2020-8190 #cve-2020-8191 #cve-2020-8193 #cve-2020-8194 #cve-2020-8195 #cve-2020-8196 #cve-2020-8197 #cve-2020-8198 #cve-2020-8199 #denial of service #gateway #information disclosure #patches #security advisory #security bugs

Deutsche Bank Interview Experience for FTE(2020)

Deutsche Bank recently visited our campus for recruitment of FTE as well as an internship. The whole process consisted of 1 coding round, 2 tech round, 1 profit round, and 1HR round.

**Coding Round: **The coding round had 3 questions which should be solved in 1.5 hr.

  • **Question 1: **It was a string manipulation question. Suppose input was string1, string2, and k seconds. We have to choose every i form 1 to k and shift a character from the string by i index (eg: if i=3 then ‘a’ would be shifted to ‘d’). Each i could be chosen only once. We need to check if we can convert string1 to string2. (20 marks)
Input: 
k=3
string1 = 'abc'
string2 = 'ddd'
Output: 
Yes
  • Question 2: Suppose at the first level of a tree a root node is always present. You are given an array count where count[i] denotes the number of nodes present at the ith level. We need to output the maximum diameter(number of edges in the longest path) possible for this tree. (50 marks)
Input:
cnt[]={2}
Output:
2
  • Question 3: A segment tree question. (50 marks)

15 students were selected for the interview. Most of the students selected for the interview had either solved all 3 questions or had good CPI and had solved 1.5/2 questions.

**Technical Round 1: **Initially, the interviewer asked me to introduce myself. He further asked what was my favorite data structure and algorithm to which I said heap and sorting. He asked me to list a few applications of the heap and what data structure I would use to store heap (ans: array for binary heap). Further, he asked me to explain the heap sort algorithm. Also, I was given an array, and he asked me to insert elements to a min-heap and show him the final structure formed. The coding questions asked me after this was:

  1. Kadane’s Algorithm 
  2. Dutch National Flag Algorithm
  3. Queue using two stacks and for a follow-up, question queue using a single stack.
  4. Find a loop in the linked list
  5. Stack using linked list
  6. InOrder, PostOrder, PreOrder Traversal of tree
  7. What is a binary search tree and perform deletion in a binary search tree.
  8. Bubble Sort Algorithm (along with its best, average and worst-case time complexity)
  9. He also asked me the time complexity for most of the questions.
  10. He asked me to explain the main difference between paging and segmentation, the difference between OSI model and TCP/IP model. Most of the basic concepts were covered by him.

Out of 15 students, 10 were selected for the next round.

**Technical Round 2: **The person who took my second interview was the VC(FX Settlements Technologist) of Deutsche Bank. He was quite friendly and nice.

He asked me to introduce myself. Further, he had a look at my resume and asked me about a DBMS project that I had mentioned. I explained to him the entire project and also my contribution to it. Based on my explanation he asked me to write 2 queries. Then he asked to explain about the project of my last internship. Since it was based on cryptography and involved a lot of math he asked 2 math-based puzzles.

  • **Puzzle 1: **Suppose there is a closed dark room and there are 5 hats in the room. 2 are red and 3 are blue. 3 women enter the room pick up any random hat wear it and come out. 2 women cannot see their own hat, but they can see the other women’s hat and the 3rd woman is blind. 2 women say that they cannot judge which colour hat they are wearing. The third woman after hearing this replies she exactly knows what colour hat she is wearing. We need to find what was the colour of the hat of the third women. (ans: blue)
  • **Puzzle 2: **The 3 & 5 Litre Die Hard Water Puzzle

He further asked me my favorite subject to which I replied DSA.

He asked me to find the number of times a given character occurs in a string and also the index. The twist here was to include any of the oops concepts in the implementation. (I used inheritance)

He also asked me a situational question. If I were leading a project and my best friend who is a part of the team stopped working for it, and we had a deadline of 1 month to complete the project, how would I handle the whole situation?

Out of 10 students, 8 were selected for the next round.

#interview experiences #deutsche bank #marketing #on-campus

Wipro Elite National Talent Hunt Interview Experience 2020

Round 1 : Online Test

As you all know that Wipro conducted the National Talent Hunt exam all over the world.

The questions were mainly asked on Aptitude, Logical and verbal ability, Essay Writing.

In the technical section there were two codes open to all major languages like java, C, C++, python etc.

The coding questions were too easy and I solved both the questions and passed all the test cases

After giving the mail I received the interview Invite for further round.

Round 2: Technical Interview

The interview started by saying that, “Make yourself comfortable, by telling about yourself”.

The interviewer only asked questions based on my resume. The following were the questions asked to me.

What is Infosys Certified Software Programmer?

What was the pattern of that exam?

What was your project during the internship with persistent systems?

How many team members were there in your project?

How was the behavior of the team members?

What is your contribution during the internship period?

In how much time did you learned Ruby on Rails?

What is your final year project and why you choose the same?

What SDLC you will be using for developing the project and Why?

I hope you are relocatable, as we have offices all across India?

And Finally, He said “ I am done with the interview, Do you have any questions?

I asked Him, what is Wipro doing in the field of AI, ML?

He told the same.

At the end, He said, “Any more questions”

I replied No Sir

He then said “You are selected, you can move ahead for you HR interview”

Round 3: HR Interview

Following were the questions asked in the HR Interview

Tell me about Yourself?

What were the questions asked in Technical interview?

Which language you used to solve coding questions in Wipro NLTH exam?

Are you ready to work from anywhere in India?

What was the topic of the essay in the Wipro NLTH exam?

Note: If you know the topic then only answer the question, else say I don’t remember the topic of essay. Because if you try to fluke the topic, the interviewer may catch you and ask more questions on the same. This happened with many students on that day. Students fluked the essay topic, further, the interview asked them to describe what you have written in the essay in short.

And Finally, He said “ I am done with the interview, Do you have any questions?”

I asked him regarding the Wipro Turbo Challenge.

He replied that Wipro is working on it, you will receive the updates regarding the same through mail.

After someday, I received the Letter Of Intent for the post of Project Engineer.

#interview experiences #marketing #wipro #wipro-interview-experience #interview

Deutsche Bank Interview Experience for graduates

Deutsche Bank recently visited our campus for hiring graduate analysts and interns. This was the first they visited our campus and I hope that they continue to visit our campus.

Online round: It consisted of three coding questions. There was one easy, one medium, and one difficult coding question. From this round, 22 students were shortlisted out of 240 students. The shortlisting for this round was based on coding scores and CGPA.

I think there was some fixed no of seats for girls(not sure though).

First Round: The interviewer for this round was a knowledgable person, first, he introduced himself and asked me to introduce myself. In my introduction, I said I love doing problem-solving so he asked me what kind of questions do you solve in competitive coding. So here are the questions he asked me.

1. What is the binary search?

I explained to him a binary search with an example. The example which I gave was finding the frequency of given no in a sorted array.

2. What is a Binary search tree?

I explained this by constructing BST from given nos. Then I explained to him in order traversal also.

3. What is the difference between primary key and a unique key?

I told him that the primary cannot have null value whereas a unique key can have a null value. He asked me a few other questions on primary keys which I don’t remember now xD ( sorry ).

4. What is meant by global variable, local variables, automatic variable?

Local Variable: I told him that the variable which is declared inside some blocks is called a local variable, their lifetime till the block. They can only be accessed inside the block.

Global variable: The variables which are declared outside all the blocks and can be accessed from anywhere in the code. They exist until the life of the program. I told him how can we access the global variable using the scope resolution operator.

At that time I did not know what automatic variable was, so I directly told no to him but later after the interview, I searched and found that local and automatic variables are the same thing.

5. What are the pointers?

I explained to him that pointers are the variable that holds the address of other variables. I told him about the references also. Then we had a discussion on the void pointer. I told him about the application of pointers.

Then he gave a code and asked me to tell its output. The code was:

void fun (int ptr )

{

ptr = 111;

}

int main(void) {

int p = 11;

fun (p);

printf ( “%d”, p );

return 0;

}

I was able to answer this question.

6. What is a queue and what is a priority queue?

  • Queue: A linear data structure that follows first in the first out policy.
  • Priority queue: Special queue which has priority. I told him priority queue is implemented using a heap data structure.

I explained to him the working of the max heap with the example and properties of heap data structure.

7. What is heap sort?

I wrote code for heap sort and explained the time complexity of all the operations. He was quite satisfied.

He asked me about greedy sort about which I had no idea :/

#interview experiences #deutsche bank #marketing

Top 130 Android Interview Questions - Crack Technical Interview Now!

Android Interview Questions and Answers from Beginner to Advanced level

DataFlair is committed to provide you all the resources to make you an android professional. We started with android tutorials along with practicals, then we published Real-time android projects along with source code. Now, we come up with frequently asked android interview questions, which will help you in showing expertise in your next interview.

android interview questions

Android Interview Questions – Get ready for your next interview

Android – one of the hottest technologies, which is having a bright future. Get ready to crack your next interview with the following android interview questions. These interview questions start with basic and cover deep concepts along with advanced topics.

Android Interview Questions for Freshers

1. What is Android?

Android is an open-source mobile operating system that is based on the modified versions of Linux kernel. Though it was mainly designed for smartphones, now it is being used for Tablets, Televisions, Smartwatches, and other Android wearables.

2. Who is the inventor of Android Technology?

The inventors of Android Technology are- Andry Rubin, Nick Sears, and Rich Miner.

3. What is the latest version of Android?

The latest version of Android is Android 10.0, known as Android Q. The upcoming major Android release is Android 11, which is the 18th version of Android. [Note: Keep checking the versions, it is as of June 2020.]

4. How many Android versions can you recall right now?

Till now, there are 17 versions of Android, which have their names in alphabetical order. The 18th version of Android is also going to come later this year. The versions of Android are here:

  • Android 1.0 – Its release is 23 September 2008.
  • Android 1.1 – Its release date is 9 February 2009.
  • Android 1.5 – Its name is Cupcake, Released on 27 April 2009.
  • Android 1.6 – Its name is Donut, Released on 15 September 2009.
  • Android 2.0 – Its name is Eclair, Released on 26 October 2009
  • Android 2.2 – Its name is Froyo, Released on 20 May 2010.
  • Android 2.3 – Its name is Gingerbread, Released on 06 December 2010.
  • Android 3.0 – Its name is Honeycomb, Released on 22 February 2011.
  • Android 4.0 – Its name is Ice Cream Sandwich, Released on 18 October 2011.
  • Android 4.1 – Its name is Jelly Bean, Released on 9 July 2012.
  • Android 4.4 – Its name is KitKat, Released on 31 October 2013.
  • Android 5.0 – Its name is Lollipop, Released on 12 November 2014.
  • Android 6.0 – Its name is Marshmallow, Released on 5 October 2015.
  • Android 7.0 – Its name is Nougat, Released on 22 August 2016.
  • Android 8.0 – Its name is Oreo, Released on 21 August 2017.
  • Android 9.0 – Its name is Pie, Released on 6 August 2018.
  • Android 10.0 – Its name is Android Q, Released on 3 September 2019.
  • Android 11.0 – As of now, it is Android 11.

5. Explain the Android Architecture with its components.

This is a popular android developer interview question

Android Architecture consists of 5 components that are-

a. Linux Kernel: It is the foundation of the Android Architecture that resides at the lowest level. It provides the level of abstraction for hardware devices and upper layer components. Linux Kernel also provides various important hardware drivers that act as software interfaces for hardwares like camera, bluetooth, etc.

b. Native Libraries: These are the libraries for Android that are written in C/C++. These libraries are useful to build many core services like ART and HAL. It provides support for core features.

c. Android Runtime: It is an Android Runtime Environment. Android Operating System uses it during the execution of the app. It performs the translation of the application bytecode into the native instructions. The runtime environment of the device then executes these native instructions.

d. Application Framework: Application Framework provides many java classes and interfaces for app development. And it also provides various high-level services. This complete Application framework makes use of Java.

e. Applications: This is the topmost layer of Android Architecture. It provides applications for the end-user, so they can use the android device and compute the tasks.

6. What are the services that the Application framework provides?

The Android application framework has the following key services-

a. Activity Manager: It uses testing and debugging methods.

b. Content provider: It provides the data from application to other layers.

c. Resource Manager: This provides users access to resources.

d. Notification Manager: This gives notification to the users regarding actions taking place in the background.

e. View System: It is the base class for widgets, and it is also responsible for event handling.

7. What are the important features of Linux Kernel?

The important features of the Linux Kernel are as follows:

a. Power Management: Linux Kernel does power management to enhance and improve the battery life of the device.

b. Memory Management: It is useful for the maximum utilization of the available memory of the device.

c. Device Management: It includes managing all the hardware device drivers. It maximizes the utilization of the available resources.

d. Security: It ensures that no application has any such permission that it affects any other application in order to maintain security.

e. Multi-tasking: Multi-tasking provides the users the ease of doing multiple tasks at the same time.

8. What are the building blocks of an Android Application?

This is a popular android interview question for freshers.

The main components of any Android application are- Activity, Services, Content Provider, and Broadcast Receiver. You can understand them as follows:

a. Activity- It is a class that acts as the entry point representing a single screen to the user. It is like a window to show the user interface.

b. Services- Services are the longest-running component that runs in the background.

c. Content Provider- The content provider is an essential component that allows apps to share data between themselves.

d. Broadcast receivers- Broadcast receiver is another most crucial application component. It helps the apps to receive and respond to broadcast messages from the system or some other application.

9. What are the important components of Android Application?

The Components of Android application are listed below:

  1. Widgets
  2. Intents
  3. Views
  4. Notification
  5. Fragments
  6. Layout XML files
  7. Resources

10. What are the widgets?

Widgets are the variations of Broadcast receivers. They are an important part of home screen customization. They often display some data and also allow users to perform actions on them. Mostly they display the app icon on the screen.

11. Can you name some types of widgets?

Mentioned below are the types of widgets-

a. Informative Widgets: These widgets show some important information. Like, the clock widget or a weather widget.

b. Collective Widgets: They are the collection of some types of elements. For example, a music widget that lets us change, skip, or forward the song.

c. Control Widgets: These widgets help us control the actions within the application through it. Like an email widget that helps check the recent mails.

d. Hybrid Widgets: Hybrid widgets are those that consist of at least two or more types of widgets.

12. What are Intents?

Intents are an important part of Android Applications. They enable communication between components of the same application as well as separate applications. The Intent signals the Android system about a certain event that has occurred.

13. Explain the types of intents briefly?

Intent is of three types that are-

a. Implicit Intents: Implicit intents are those in which there is no description of the component name but only the action.

b. Explicit Intents: In explicit intents, the target component is present by declaring the name of the component.

c. Pending Intents: These are those intents that act as a shield over the Intent objects. It covers the intent objects and grants permission to the external app components to access them.

14. What is a View?

A view is an important building block that helps in designing the user interface of the application. It can be a rectangular box or a circular shape, for example, Text View, Edit Text, Buttons, etc. Views occupy a certain area of the screen, and it is also responsible for event handling. A view is the superclass of all the graphical user interface components.

15. What do you understand by View Group?

It is the subclass of the ViewClass. It gives an invisible container to hold layouts or views. You can understand view groups as special views that are capable of holding other views, that are Child View.

16. What do you understand about Shared Preferences?

It is a simple mechanism for data storage in Android. In this, there is no need to create files, and using APIs, it stores the data in XML files. It stores the data in the pair of key-values. SharedPreferences class lets the user save the values and retrieve them when required. Using SharedPreferences we can save primitive data like- boolean, float, integer, string and long.

17. What is a Notification?

A notification is just like a message that shows up outside the Application UI to provide reminders to the users. They remind the user about a message received, or some other timely information from the app.

18. Give names of Notification types.

There are three types of notifications namely-

a. Toast Notification- This notification is the one that fades away sometime after it pops up.

b. Status Notification- This notification stays till the user takes some action on it.

c. Dialog Notification- This notification is the result of an Active Activity.

19. What are fragments?

A fragment is a part of the complete user interface. These are present in Activity, and an activity can have one or more fragments at the same time. We can reuse a fragment in multiple activities as well.

20. What are the types of fragments?

There are three types of fragments that are: Single Fragment, List Fragment, Fragment Transactions.

  1. Single Transactions can only show a single view for the user.
  2. List Fragments have a special list view feature that provides a list from which the user can select one.
  3. Fragment Transactions are helpful for the transition between one fragment to the other.

Frequently asked Android Interview Questions and Answers

21. What are Layout XML files?

Layout XML files contain the structure for the user interface of the application. The XML file also contains various different layouts and views, and they also specify various GUI components that are there in Activity or fragments.

22. What are Resources in Android Application?

The resources in Android Apps defines images, texts, strings, colors, etc. Everything in resources directory is referenced in the source code of the app so that we can use them.

23. Can you develop Android Apps with languages other than Java? If so, name some.

Yes, there are many languages that we can work with, for the development of Android Applications. To name some, I would say Java, Python, C, C++, Kotlin, C#, Corona/LUA.

24. What are the states of the Activity Lifecycle?

Activity lifecycle has the following four stages-

a. Running State: As soon as the activity starts, it is the first state.

b. Paused State: When some other activity starts without closing the previous one, the running activity turns into the Paused state.

c. Resume State: When the activity opens again after being in pause state, it comes into the Resume State.

d. Stopped State: When the user closes the application or stops using it, the activity goes to the Stopped state.

25. What are some methods of Activity?

The methods of Activity are as follows:

  • onCreate()
  • onStart()
  • onPause()
  • onRestart()
  • onResume()
  • onStop()
  • onDestroy()

26. How can you launch an activity in Android?

We launch an activity using Intents. For this we need to use intent as follows:

  1. ntent intent_name= new Intent(this, Activity_name.class);
  2. startActivity(intent_name);

27. What is the service lifecycle?

There are two states of a service that are-

a. Started State: This is when the service starts its execution. A Services come in start state only through the startService() method.

b. Bounded State: A service is in the bounded state when it calls the method bindService().

28. What are some methods of Services?

The methods of service are as follows-

  • onStartCommand()
  • onBind()
  • onCreate()
  • onUnbind()
  • onDestroy()
  • onRebind()

29. What are the types of Broadcast?

Broadcasts are of two types that are-

a. Ordered Broadcast: Ordered broadcasts are Synchronous and work in a proper order. It decides the order by using the priority assigned to the broadcasts.

b. Normal Broadcast: These are asynchronous and unordered. They are more efficient as they run unorderly and all at once. But, they lack full utilization of the results.

30. What are useful impotent folders in Android?

The impotent folders in an Android application are-

  1. build.xml- It is responsible for the build of Android applications.
  2. bin/ – The bin folder works as a staging area to wrap the files packages into the APK.
  3. src/ – The src is a folder where all the source files of the project are present.
  4. res/ – The res is the resource folder that stores values of the resources that are used in the application. These resources can be colors, styles, strings, dimensions, etc.
  5. assets/ – It provides a facility to include files like text, XML, fonts, music, and video in the Android application.

31. What are the important files for Android Application when working on Android Studio?

This is an important android studio interview question

There are following three files that we need to work on for an application to work-

a. The AndroidManifest.xml file: It has all the information about the application.

b. The MainActivity.java file: It is the app file that actually gets converted to the dalvik executable and runs the application. It is written in java.

c. The Activity_main.xml file: It is the layout file that is available in the res/layout directory. It is another mostly used file while developing the application.

32. Which database do you use for Android Application development?

The database that we use for Android Applications is SQLite. It is because SQLite is lightweight and specially developed for Android Apps. SQLite works the same way as SQL using the same commands.

33. Tell us some features of Android OS.

The best features of Android include-

  1. Multi-tasking
  2. Support for a great range of languages
  3. Support for split-screen
  4. High connectivity with 5G support
  5. Motion Control

34. Why did you learn Android development?

Learning Android Studio is a good idea because of the following-

  1. It has a low application development cost.
  2. It is an open-source platform.
  3. It has multi-platform support as well as Multi-carrier support.
  4. It is open for customizations.
  5. Android is a largely used operating system throughout the world.

35. What are the different ways of storage supported in Android?

The various storage ways supported in Android are as follows:

  1. Shared Preference
  2. Internal Storage
  3. External Storage
  4. SQLite Databases
  5. Network Connection

36. What are layouts?

Layout is nothing but arrangements of elements on the device screen. These elements can be images, tests, videos, anything. They basically define the structure of the Android user interface to make it user friendly.

37. How many layout types are there?

The type of layouts used in Android Apps are as follows:

  1. Linear Layout
  2. Relative Layout
  3. Constraint Layout
  4. Table Layout
  5. Frame Layout
  6. Absolute Layout
  7. Scrollview layout

38. What is an APK?

An APK stands for Android Package that is a file format of Android Applications. Android OS uses this package for the distribution and installation of the Android Application.

39. What is an Android Manifest file?

The manifest file describes all the essential information about the project application for build tools, Android operating system, and google play. This file is a must for every Android project that we develop, and it is present in the root of the project source set.

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