Tencent byte Alibaba Xiaomi jd.com offer got a soft hand, and the teacher said it was great

Preface

Look back on your own experience in this period of time , In March , The cause of the epidemic, the company informed the layoffs , I went out in a hurry to meet a few , But they didn't get it in the end offer, I feel a little cold this winter . By may , The company started a second wave of layoffs , I decided to take the initiative to take compensation and leave . I made some preparations for the subsequent interview , Basically, you can go to hr Noodles , And then I got it offer, I'd like to share with you my job search experience , Hope to give you some reference .

commonly Android The interview is divided into two parts ：Java Part and Android part , Let's talk about some specific questions and related knowledge that I met in the interview process .

One 、 picture

1、 Picture library comparison 2、LRUCache principle 3、 How to load pictures 4、 To realize the image library by yourself , How do you do it? ？5、Glide The source code parsing 6、Glide What cache to use ？7、Glide How to control the size of memory cache ？

Two 、 Networks and security mechanisms

1. Network framework comparison and source analysis 2. Design your own network request framework , How do you do it? ？3. Network request cache processing ,okhttp How to deal with network cache 4. Load a from the network 10M Pictures of the , Talk about the precautions 5.TCP Of 3 Three handshakes and four waves 6.TCP And UDP The difference between 7.TCP And UDP Application 8.HTTP agreement 9.HTTP1.0 And 2.0 The difference between 10.HTTP Message structure 11.HTTP And HTTPS And how to achieve security 12. How to verify the validity of a certificate ?13.https Where to use symmetric encryption , Where to use asymmetric encryption , For encryption algorithms （ Such as RSA） Wait to see if you understand ?14.client How to make sure the messages you send are server received ?15. Talk to you about WebSocket The understanding of the 16.WebSocket And socket The difference between 17. Talk about your understanding of Android signature .18. Please explain why Android needs to add a signature mechanism ?19. Encrypted video transmission 20.App  How to sandbox , Why do you do this ？21. Authority management system （ How does the underlying authority work  grant  Of ）？

3、 ... and 、 database

1.Sqlite upgrade , Add field statement 2. Database framework comparison and source code analysis 3. Database optimization 4. Database data migration

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

1. Understanding of hot fixes and plug-ins 2. Analysis of plug-in principle 3. Modular implementation （ benefits , reason ）4. Hot repair 、 pluggable 5. Understanding of project componentization 6. Description click  Android Studio  Of  build  What happened after the button

5、 ... and 、 Architecture design and design patterns

1. Talk to you about Android Understanding of design patterns 2.MVC MVP MVVM Principles and differences 3. What design patterns do you know ？4. Design patterns commonly used in projects 5. Handwriting producers / Consumer model 6. Write the code for the observer pattern 7. Adapter pattern , Decorator mode , Similarities and differences in appearance patterns ？8. Some open source frameworks used , Introduce a source code , Internal implementation process .9. Talk about right RxJava The understanding of the 10.Rxjava Send event steps 11.RxJava The role of , The advantages and disadvantages of asynchronous operations compared with the usual use 12. say something EventBus effect , Realization way , Instead of EventBus The way 13. from 0 Design a App The overall architecture , How to do it ？14. Tell me about an application that you think is currently popular and Design ( such as ： live broadcast APP,P2P Finance , Small video, etc )15. Talk about right java State machine understanding 16.Fragment If in Adapter How to decouple the use of ？17.Binder Mechanism and underlying implementation 18. How to do this for application update ？( answer ： Grayscale , Force update , Sub regional update )？19. Achieve one Json Parser ( You can speed it up by regularizing )20. Count the starting time , standard

Finally, let's talk about my study route

Actually, it's very simple. Here's the picture , It's all inclusive Android All the knowledge you need to learn , altogether 8 Large plate ：

• The necessary skills for an architect to build a foundation

• Android Framework architecture （ 
  《Android Summary of learning notes + Latest mobile architecture video + Big Android interview questions + Project actual combat source code handout 》 Free open source Hui Xin search official account 【 Advanced programming 】
    senior UI+FrameWork Source code ）

• 360°Androidapp All round performance tuning

• The design idea interprets the open source framework

• NDK Module development

• Mobile architect special project actual combat link

• Mobile architects have to learn wechat apps

• Mixed development flutter

Android Learning materials

I? , The above eight parts of the system have done a learning system of information and video , That's about it , I won't write it all out , Otherwise, it's too long to affect people's reading .

330 page PDF Android Learning core notes （ It's on the top 8 Large plate ）

Android The learning system corresponds to the video

summary

I hope that through my own learning methods to help you to improve technology ：

• 1、 How to read 、 Look at the source code and do the project , Usually a variety of summary

• 2、 We can't stay on some basic api The use of , We should study it in a deeper direction , such as activity、view Internal operation mechanism of , such as Android Memory optimization , such as aidl, such as JNI etc. , It's not just about being able to use , And by reading the source code , Understand how it works

• 3、 At the same time, there are certain requirements for the architecture , Architecture is abstract , But design patterns are concrete , So we must strengthen the study of design patterns

• 4、android There are also many directions , senior UI, Mobile architect , Data structure and algorithm and audio and video FFMpeg decode , If you're interested in one of them , Let's go ahead boldly ！

I hope you like it a lot , forward , Comments and attention , Your support is my motivation to continue ！ come on. ！