The 5-year Android development interview took 20 days to join Alibaba

A friend went to Ali for an interview , The interview cost a total of 20 Days or so , Contains 4 Round the phone interview 、1 Round written test 、1 Round supervisor video interview 、1 round hr Video interview . According to what he says ,70% All the people will be carried in the first round of interview , If he hadn't done enough preparation before the interview , I guess I can't hold on to the next interview .

Actually , The first round of telephone interview, in addition to some regular self introduction , All the questions are about some basic professional knowledge , The main purpose is to screen out some people with weak foundation , So as not to waste everyone's time . The questions asked mainly involve several aspects ：

Android problem ：

1. How to realize communication among the four components （binder, Cold start ）
2. Glide Three level cache , Big picture loading , The necessity of active cache design , And Picasso What's the difference?
3. Under the said MVP, Log in as chestnuts , And MVC What are the advantages of comparison
4. Boot mode , similarities and differences ,activity A open B Lifecycle call
5. handler Design patterns 、 Blocking mechanism 、 Synchronous barrier mechanism 、 Thread switching 、Looper、ThreadLocal
6. Retrofit Implementation principle of （ A dynamic proxy + annotation ）,rxjava How to achieve thread switching 、 Back pressure 、 Version difference
7. apk Reinforcement principle , Shelling and shelling ;
8. apk What have you done to lose weight , How much less M
9. Say a custom view, Drawing process
10. Let's talk about the event distribution mechanism , Two side by side view, Click to move to another , Which methods are called
11. What are the memory leaks ,handler Cause of memory leak , How to solve , Tools
12. tcp Three handshakes 、 Four waves ,HTTP And HTTPS difference ,HTTP1.0 And 2.0 difference ,get And post difference
13. The principle of componentization , Different from plug-in , A dynamic proxy

java problem ：

1. Annotation type , difference , Yuan notes
2. Tell me about the understanding of lock ：sync、lock、cas、volatile、JMM、 Read-write lock
3. HashMap principle , Access procedure , Why red and black trees , Comparison between red black tree and complete binary tree ,HashTab、concurrentHashMap,concurrent What's in the bag
4. The understanding of generics , Type Erasure
5. Under the said JVM Understanding , Memory model , Garbage collection algorithm , Accessibility analysis , Reference counting , Four quotations
6. Symmetric asymmetric encryption 、md5 principle

…

And asked a lot of other questions , I won't list them one by one here . If you can't answer these questions , Then I suggest you brush the question bank . I have a copy of Andorid From the underlying infrastructure to growth notes and Tencent 、 Iqiyi 、 Byte and other big factory interview questions , Help you to deal with the interview Compulsory examination site 、 High frequency point 、 Pay rise point , These notes and interview documents have been sorted out and collected .

If you need to refer to the full version, please go to me GitHub Access and review .

GitHub Address ： https://github.com/733gh/Android-T3

Andorid From the underlying infrastructure to the directory of growth notes

Android Develop essential underlying technology modules

BATJ These big companies require solid Java Language foundation and underlying principle of virtual machine , This part is Android Most commonly used in development java Language related knowledge . In this , Combined with the Dex File encryption practice and hot repair handwriting practice to let everyone deeply experience Java The importance of language system and in Android The position in the development

FrameWork Source code and UI And jetpack modular

stay Android in ,Framework Refers to the system architecture layer .Framework The Chinese meaning is “ frame ”, In software development, it usually refers to the development framework , On top of the kernel layer in a system , Provide interfaces for top-level applications , Designed to help developers quickly develop top-level applications , You don't have to care about the operating mechanism of the system kernel , Usually Framework Will hide main Functions and other components required by the application , Developers just need to focus on the implementation of functional code . Say something simple. ,Framework The specific work is to android Application developers provide a series of services and services API The interface of .

FrameWork The source code parsing ： Binder+Handler+Zygote+ AMS+ PMS+WMS

UI Deep analysis of the underlying source code ：UI Drawing process + LayoutInflater + Event distribution mechanism + Attribute animation +ViewGroup+ View

Jetpack Practical combat and large factory architecture evolution practice manual

Android Performance analysis and optimization of actual combat scheme

As a Android The programmer , To be honest, we should do a good job in performance , It's not easy . Why do you say that? ? Because there is too much knowledge to contact , Android It's a whole , Pull one hair and move the whole body , It doesn't mean that you can do well only by understanding one module . This 《Android Advanced manual of performance analysis and optimization 》, Let everyone want to enter Android People in the field of system development and optimization , You can get started quickly through this note book , At the same time, it is also a sort of knowledge , Leak filling , Lifelong learning .

• Memory optimization
• Layout optimization
• Startup optimization
• Carton optimization
• Stability optimization
• Power optimization
• Thread optimization
• Slimming optimization

If you need to refer to the full version, please go to me GitHub Access and review .

GitHub Address ： https://github.com/733gh/Android-T3

Andorid Advanced audio and video combat module

• Basic grammar
• H264 Video coding
• H265 Coding principle and application
• MediaCodec training
• Opengl And audio and video codec
• actual combat

Android Architects must elaborate on the analysis module of the source code framework

Gradle High level practical module

• Groovy grammar
• Gradle Android The plug-in configuration
• actual combat

Kotlin Entry to mastery module

Flutter2.0 Hybrid development module

• Dart grammar
• Flutter2.0 And UI
• Flutter2.0 Advanced
• Flutter2.0 Optimize
• actual combat

Hongmeng 2.0 System development module

• Ability Components
• Distributed tasks
• Event bus
• Hongmeng thread
• UI Custom control

summary

Do the same Andorid, Some people work 5 The annual salary has not changed , Some people work 2 It's a year's salary 50W. This phenomenon may not have been obvious a few years ago , But with the rapid development of back-end technology in recent years , Once there was only one UI The era of being able to travel all over the world is long gone , The differentiation of talent level is more and more obvious .

Competition is always very cruel , After all, it's not so easy to be an architect , The growth of an architect comes from opportunities , Hard work and talent ！ In this era of surging waves , Whether you've just worked or developed for a few years , I believe the above Andorid You need to read everything from the underlying infrastructure to the growth notes , Hope to be helpful to your career development . These notes and interview documents have been sorted out and collected .

If you need to refer to the full version, please go to me GitHub Access and review .

GitHub Address ： https://github.com/733gh/Android-T3