985 Android programmers won the oral offer of Alibaba P6 in 40 days. After the successful interview, they sorted out these interview ideas

• I think my career experience needs a big factory experience .

• I didn't really want to say this , But it is also a point that I care about , That is, the organizational structure changes frequently , Lead to frequent changes in business lines , This is bad for the business , Need to run in all the time .

Interview objectives

In fact, the interview goal was not single , For example, my interview objectives are sorted as follows ：

Alibaba > headlines > Meituan > millet

Ali's interview experience

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Ali side

I asked about the items on my resume , Then start asking for knowledge .

• volley Source code , I've been talking about image caching for a long time ,http Caching mechanism in ,Last-Modify And so on ;

• fragment Life cycle of ;

• service Some knowledge ;

• Event distribution mechanism ;

• Binder Implementation mechanism ,Stub Class asInterface Function function ,BnBinder and BpBinder difference ;

• gradle in buildToolsVersion and TargetSdkVersion What's the difference ;

• Some solutions for mobile phone adaptation ;

• hashmap Implementation principle of ;

• Can static methods be overridden ;

I've talked about that 1 One and a half hours , I was a little nervous at first , It's a slow conversation , It's much better. , The interviewer speaks a little fast , It always needs to be repeated by the interviewer , I also inadvertently speak faster , But I can see that the interviewer is still very good .

Ali on both sides

• 3 Secondary handshake 4 Reason for the second wave , And why it needs to be done ;

• data structure , Some properties of searching binary trees , Balanced binary trees ;

• hashmap Is how to solve hash Conflicting ;

• Process is different from thread ;

• Write a binary search and singleton pattern ;

• http Synchronization and asynchrony in ;

• I talked about some things I did on the project , Asked about career planning ;

Because the second interview is not done Android, The person who interviewed me went to a temporary meeting , So this round of interview didn't ask much android Related knowledge , But the second interviewer always smiles , So this round is easy , It's more like a discussion .

It's afternoon after the interview 4:30 了 , Because the interview day is Friday , There are more meetings on Friday , So wait a minute , Two interviewers say three interviewers are in a meeting , Another appointment for the interview , I'd like to finish this interview , It's just a wait 2 One and a half hours , period hr Tell me the interviewer is a big bull .

Three sides of Ali

• In my submission Android Do a few good places , Then I asked more in-depth questions according to what I said ;

• Android How to manage resources ;

• java Some important characteristics ;

• Five layer network structure , Each layer protocol , Because my network is not very good , Other questions were asked （ for example MAC Address and ip The difference of address, etc ）;

• Why did you leave the original company , And career planning , And then because it's about night after the interview 8 O 'clock , Let me go back first , Let's go next week hr Contact me , I think it's time to pass the interview ;

Ali HR Noodles

Enterprise intelligence business department Leader I received it again HR Face to face interview notice , The following questions were asked in this round of interview ：

• Why do you want to leave your present company

• How do you rank your company , What position level are you now

• Talk about your performance in the company

《Android Summary of learning notes + Latest mobile architecture video + Big Android interview questions + Project actual combat source code handout 》

【docs.qq.com/doc/DSkNLaERkbnFoS0ZF】 Full content open source sharing

• One of the most fulfilling things you've ever done

• What are your general solutions to problems

• What opportunity did you choose to be the front end

• Have you made any process or institutional improvements to your company

• What books are you reading recently , Is it related to work , Why do you read these books

• I saw that you had an interview before, and the other two departments were hung on one side , What do you think is the reason

• How much salary do you expect

** tip ：** here HR It's not just these questions , For example, why do you like Android Develop this position 、 Your future career plan 、 What do you think are your strengths and weaknesses 、 Why Alibaba 、 Comment on the previous interviewers 、 Which Ali products have you used? By the way, talk about the advantages and disadvantages of these products 、 How do you understand the Internet …

Interview experience ：

Ali is still very skilled , It can be seen from the level of the interviewer , Especially the core Department of takeaway , The office environment is good , But it just feels a little messy , I don't know if it's because there are a lot of people interviewing today , Basically there's been a lot of people walking back and forth , There is some noise .

Share some interview ideas

The interview process is a   Self examination   The process of , The same is also a Very particular about the way The process of , Next, we will elaborate through these two aspects .

• Self examination

Technical strength is the premise of the interview , You need to know yourself very clearly , Know the position you want to interview , This is a prerequisite for the success of the interview .

Like my working hours 3 More years , The position I want to interview is senior Android The engineer , Can my own quality meet the requirements of the interview position ？

In fact, I was not sure about this when I just interviewed , Because in the company has 3 year , In fact, I don't understand the development of the outside world during this period of time , So I did the following things .

• Make an overall summary of the project business they are responsible for .

• Summarize all technologies used in the project as a whole .

• Review common frame / System Source code , such as Glide,Okhttp,Reteofit,Activity Start process ,Hander,HashMap, Lock and other commonly used source code principles .

• see BOSS, Check the skills required by the corresponding position .

• Ways and means

Even if you are good at the interview , Rich project experience , You also have some knowledge blind spots , There are also technical points that have not been taken into account , When these points appear together, your interview success rate will be greatly reduced . So for the interview, I summarized the following processes .

1. The interview is divided into 3 Stages （ initial stage , Mid - , high offer period ）.

initial stage   Mainly through （BOSS, Just pull the hook and deliver it ）, At the beginning, it was mainly delivered to small companies , This part of the company has two purposes . The first is to exchange technical points with each other , Constantly improve their technical coverage . The second is to understand the demand points of the current market .

Mid -   Mainly through headhunters to deliver , This stage is mainly delivered to the midfield , Such companies require deeper technical depth than initial companies , The investigation of the algorithm will aggravate , At the same time, the technical level of the interviewer will also be higher , Even some midfield interview difficulty will reach the level of the big game , This interim period should last as long as possible , It is very helpful for the follow-up interview experience summary .

high offer period   This stage is mainly delivered to your target enterprise , Remember that the interview priority starts with the least interested company . The way of delivery is also through headhunters , This will speed up the interview process . The above junior high school is more about improving your technical coverage , And your sense of interview . In order to let you challenge the enterprise you want to go most with the best attitude , Along the way, the success rate of your interview will be greatly improved .

• communication skills

In addition to examining your technical strength in the interview , Another point is more important , That's communication skills , The higher the position you interview , The higher your communication skills are .

Communication is a particularly important point , This determines whether you can fully explain what you know and want very clearly .

The process of our interview is a process of self marketing , So when you feel that your communication skills are not very strong , Then you need to summarize a few points .

such as An excellent self introduction , One of the most difficult problems encountered in the project , If you are asked to design an architecture, how should you design , Briefly introduce the business you are responsible for   etc. …

How to improve skills and improve the passing rate of large factories ？

Below, I'd like to provide a learning route that I have collected and sorted out over the years , Let me give you a reference ：

Learn the technologies of the first-line big factories ：

Big factories are our technology pioneers , Not just technologies , There are also many eye opening ways to use , Learning these will help improve your competitiveness , Deep understanding can also improve your learning efficiency .

Now the competition is so fierce , Only through constant learning , Improve yourself , To remain competitive .

1.2020 High frequency knowledge points of big factory interview

• picture

• Networks and security mechanisms

• database

• pluggable 、 modularization 、 Componentization 、 Hot repair 、 Incremental updating 、Gradle

• Architecture design and design patterns

• performance optimization

• Android Framework

• Android Excellent tripartite library source code

2.Jetpack Architecture components go from beginner to proficient

• Android Jetpack - Navigation

• Android Jetpack - Data Binding

• Android Jetpack - ViewModel & LiveData

• Android Jetpack - Room

• Android Jetpack - Paging

• Android Jetpack - WorkManger

• Android Jetpack Architecture components Lifecycle

• Android Jetpack Compose The best guide to getting started

3.Framework Refined kernel parsing

Main contents include ：

• In depth analysis of Binder

• In depth analysis of Handler

• Dalvik VM Process system

• In depth analysis of WMS

• PackagerManagerService

4.Kotlin Strengthen actual combat （ attach Demo）

• Chapter one Kotlin Introductory tutorial

• Chapter two Kotlin Guide to avoiding the pit in actual combat

• The third chapter Project practice 《Kotlin Jetpack actual combat 》

• From a man who worships the great God Demo Start

• Kotlin Write Gradle What kind of experience is scripting ？

• Kotlin Three levels of programming

• Kotlin Higher order function

• Kotlin Generic

• Kotlin Expand

• Kotlin entrust

• coroutines “ unknown ” Debugging skills

• Graphic coroutine ：suspend

5.Android The design idea interprets the open source framework

• Hot repair

• pluggable

• Component frame design

• Image loading framework

• Network request framework