Preparation for Android interview (including the whole process of interview, interview preparation, interview questions and materials, etc.)

Preface

It is said that the Internet market is very poor this year ,Android Worse market . But what happened , You can't just listen to others , Go out and have a look by yourself . My interview stage is basically 3 month , The preparation stage should be pushed forward for another month . During this period, there were many interview opportunities for first and second tier Internet companies , However, due to inadequate preparation, I missed some opportunities , After that, I was constantly summarizing my experience in the interview , More and more confident , Finally chose iqiyi . On the whole, the job search situation is ok , Not very good, but not very bad , There will be a certain element of luck , So if you want to change your job, you must not resign naked .

Here is a summary of the interview experience and some experience during this period , The interview questions and some learning materials encountered during the period will be attached later .

Job preparation

If you decide that you want to change jobs, you should be ready to apply for a job early .

Knowledge preparation

After determining the idea of changing jobs , We should prepare for the interview . When reviewing the knowledge points, I suggest sorting them out ：Java Basics 、Android Basics 、UI Control 、 Network communication 、 Architecture design 、 Performance optimization and source code process knowledge .

Data structure and algorithm , Brushing dozens of questions according to categories should be able to cope with most situations ,Android Generally, there are not too difficult algorithm questions in the interview （ But the test is more flexible ）.

resume

Resume is the first step in job hunting , It is also a stepping stone for you to get an interview , We must polish it well . Here is what I will share HR The main focus when screening resumes ：

I'm in this year 1 I tried to submit my resume several times in August , Not very good results , Later, some adjustments and optimizations were made .3 It's better to invest again in January , Received some responses in succession . I have no previous experience in a large factory , Not a first-class undergraduate , But I can also receive many interview opportunities from big manufacturers , So I feel that the content of my resume has played a certain role .

It's mentioned above “ Highlight time ”, It can be understood as a highlight . How to make your resume different from job seekers of the same ability level , That is to find our highlight . There's a suggestion , When we are writing our resume , You can deliberately exaggerate your ability , Or write about what we want to be , Then we will make these contents come true one by one in front of the resume , Let them become their own highlights . Be careful not to just boast , Do not implement , Because it was found “ Counterfeiting ” But it's very serious .

Resume delivery

In my experience , Relatively reliable resume delivery methods include ：Boss Direct employment 、 affectionately 、 push .

It should be noted that ,Boss Direct employment and pulse only others contact you , You deliver it again , The feedback rate will be higher . If it is the recruiter you actively contact , That's a high probability that you won't receive a response . It is speculated that many enterprises will hang recruitment information on it without many recruitment positions , This time HR Will not pay attention to the delivered resume . This is also why we can see that many people post hundreds of resumes without any response , Don't be discouraged. , This does not necessarily mean that you are incompetent .

Waiting for the recruiter to contact is relatively passive , Taking the initiative will be more effective . That is to find internal push , Generally, there are rewards for internal promotion , Therefore, the company's internal staff are willing to release positions to obtain internally promoted candidates . affectionately , Nuggets ,V2EX, Some well-known official account can find many internal promotion positions , We can dig by ourselves .

Interview process

At present, most Internet companies are 2 Wheel technology +1 round HR, Or three rounds of technical +1 round HR. The current interview form is mostly video interview , Some are telephone interviews . Video interview words , If it's through Zoom, Enterprise WeChat , Nailing, etc. generally do not inspect handwritten code . If it is through Niuke , Generally, I will examine the handwritten code . For handwritten code , Only algorithm problems require accuracy , Can run , For design topics , We can write pseudo code .

If it comes to HR This round basically shows that we have passed the interview , If you decide to join , Next is back tone , Salary certificate , Proof of education , A series of operations such as entry physical examination .

Last

Then I will share the interview questions , I hope I can help you in my limited ability ！ If you need it, you can click on the card below to get it for free

The interview questions are divided into 9 Parts of ：Java Basics 、Android Basics 、UI Control section 、 Network communication 、 Architecture design 、 Performance optimization 、 Source code flow chapter 、 New technology 、 Interview , common 1932 page ！

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
• Class loading mechanism / Parents entrust

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
• Dynamic page construction scheme

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 …
• 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 whole asynchronous request process
• 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

Chapter viii. New technology

• Practical problems

Chapter nine Interview

• Open source documentation
• Interview literature

The space for , Only part of the content is shown in the form of screenshots

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Full set of video materials ：

One 、 Interview collection

Two 、 Source code analysis collection

3、 ... and 、 Open source framework collection

summary

In addition, the interview is an examination to examine your knowledge mastery , Doing well in the exam can improve your self-confidence , A bad exam can help us locate our own problems , In any case, it is not a loss . The interview can also help us understand the market , salary , Own competitiveness , A series of situations such as popular technology stack . So I really suggest that even if you don't consider changing jobs , You can also go out for interviews several times a year at a fixed time .

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