Necessary interview skills for Android (including interview questions and learning materials)

Preface

There is no absolute genius , Only constant effort . For every one of us , The only way to change your destiny is to work hard + lucky , But if you're not lucky , That can only increase the proportion of efforts .

2022 Nearly half of the year has passed , For many people , This year has gone through too much , Maybe it's one of the most colorful strokes in my memory in the past ten years . In the past year ,“ boil ” It's my keyword at this stage , It's too often to give up , The good thing is that I “ boil ” In the past the , In the new 2021 In the year , There is also a very good start , I got what I wanted offer.

Interview and necessary skills

Here are just a few things , It may not be very complete , But it's especially suitable for , It doesn't have to follow the process , It may be interleaved , There may be , Depending on the size of the company and the mood of the interviewer （ Ha ha ha , Let's ask for more ）. I suggest that you should master all the following things , Nothing to write code , Practice hands , Be sure to use where you can in the project , There may be many pits , Make sure you find a way to fill the hole , Then I remember this experience , I'm sure I can talk about it with others . If you are right , Then the other side will lose first , Then I admire you in my heart .

1. Generally, the first round is basic interview , A solid foundation is needed

• Most commonly used Android Basic knowledge of

• Java Basic knowledge of

• Learn some The principle of common things , for example ：handler, thread etc.

• Technical points in the project

2. The second round needs to understand something deeper

• Android Principle of event distribution mechanism
• Android Principle of drawing mechanism
• WindowManager Knowledge about
• Inter process transport
• Java Memory management mechanism
• Some commonly used list,map principle , And the differences between subclasses

3. There's no problem getting into the third round , But pay attention to the following problems

• This round is usually Boss or department head , The questions you ask are generally based on Depth and breadth

• When it comes to salary , Say a suitable , Small companies are free , Big companies must be careful , When there is no bottom in my heart , You can tell them , Let the other side give a reasonable salary . It's usually based on the original wage , Listen to the headhunter saying that the general increase is 15%-30%, super NB Yes, you can 30% And above , If I feel good , It's very powerful , The highest suggestion is 20%, The average person is set to 15% Left and right are the most reliable . There is usually a mechanism within the company , It depends on the company .

• Our interview principle is to get a reasonable salary , obtain offer

• Personal development , This question is hard to answer , If it's not in line with the company's direction , It's very likely that they won't get along with the company . It is suggested to ask what the company lacks more tentatively , Can you give something to the company . Of course, for those who pursue themselves , That can be safely and boldly mentioned . My direction is architect , Ha ha ha , It's extreme , Don't follow me . I feel the choice is two-way , So I know what I need .

• What are you good at UI Or something ？ This question is more difficult to answer . You should say that you are good at UI, Does that mean you can't do anything else ？ Although I don't know the interviewer's intention , But I can feel , This question is not so easy to answer , I will answer that I can do it myself , What business to meet what needs . Maybe the answer is not very good , In a word, it's just in line with the company's position , It's not a mistake .

  summary

In order to help you learn better , I'd like to share with you a copy of BAT The boss sorted it out 《2022 Middle and advanced Android Summary of interview questions 》, It contains all Android Interview knowledge , It can supply knowledge comprehensively . This document contains Java and Android Two major parts , For reasons of length , Show some knowledge here , Friends in need Free of charge .

Chapter one Java Basics

• Comparison between static inner class and non static inner class
• Understanding and application of polymorphism
• java Understanding the polymorphism of methods
• java The difference between interface and inheritance in
• Benefits of thread pools , Detailed explanation , Single case （ It's definitely easy to remember ）
• Advantages and principles of thread pool
• Advantages of thread pool （ a key ）
• Why not recommend to pass Executors Create thread pool directly
• Not afraid of difficulties BlockingQueue And its implementation
• In depth understanding of ReentrantLock And Condition
• Java Multithreading ： Communication between threads Lock
• Synchronized How keywords work
• ReentrantLock principle
• HashMap Medium Hash Conflict resolution and capacity expansion mechanism
• JVM Frequently asked questions
• JVM Memory structure
  

Chapter two Android Basics

• Activity Knowledge point ( Must ask )
• Fragment Knowledge point
• Service Knowledge point
• Intent Knowledge point
  

The third chapter UI Control section

• Screen adaptation
• Main control optimization
• Event distribution and nested scrolling
  

Chapter four Network communication

• Network protocol
  

The fifth chapter Architecture design

• MVP Architecture design
• Component architecture
  

Chapter six Performance optimization

• Startup optimization
• Memory optimization
• Painting optimization
• Package optimization
  

Chapter vii. Source code flow chapter

• Open source library source analysis
• Glide Source code analysis
• Android Interview questions ：Glide
• day 20 Interview questions ：Glide Interview questions
• Talk about Glide Those things in the interview
• interviewer ： If the resume says Glide, Please pay attention to the following points …
• Glide OOM Problem solving summary
• OkHttp Source code analysis
• Okhttp Connection pool reuse mechanism
• Okhttp Implementation of process and optimization
• An article for your benefit okhttp analysis
• OkHttp Interview –OkHttp The entire asynchronous request flow
• OkHttp Interview –HttpEngine Medium sendRequest Methods,
• OkHttp Analysis summary
• Okhttp How task queues work
• Android High frequency interview topics - Architecture （ Two ）okhttp An interview must know and know
• Android network optimization , Use HTTPDNS Optimize DNS, From principle to OkHttp Integrate
• Retrofit Source code analysis
• RxJava Source code analysis
• RxJava Principle and source code analysis

Chapter viii. New technology

• Practical problems
  

Chapter nine Interview

• Open source documentation
• A collection of interview questions
  

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Last

Although this year, many large Internet companies are carrying out certain layoffs , But don't panic , Plan your study plan , Keep learning and improving your skills , Believe that you can , Don't look down on yourself . In the end, I hope all of you can find a satisfactory job .