Preface
Recently I started to secretly submit my resume. The contract with the old club is about to expire. I want to know what I’m going to do, and if I want to renew the contract, I have a bottom line. I will take a quiet look at new job opportunities by the way. Although the market environment is not good, we are in an industry where wage increases depend on job-hopping.
Since I have been working for 5 years and have gained experience, I have received a lot of interview invitations, but I didn’t receive a satisfactory offer after half a month’s interview. It’s really **"harmed by the current company"** . Below are some of the interview questions I summarized, hoping to have some help for those who want to change jobs.
How to learn Android Framework
Since Framework is so important, how do we learn it?
Regarding how to learn Android Framework development knowledge, I recently had the honor to pick up this Android framework advanced development note in the hands of the Bytedance Director. Some of the knowledge chapters were published on Zhihu and even 1000+ likes. I will share it with you today. everyone.
This note mainly explains the main modules of Framework:
Chapter 1: In-depth analysis of Binder
Binder mechanism as a means of inter-process communication, basically runs through all the andorid framework layers. So we must first understand the basic communication mechanism of Android Binder.
Knowledge points in this chapter
- Binder series-opening
- Preliminary Study on Binder Driver
- Binder Driver Revisited
- Binder starts ServiceManager
- Get ServiceManager
- Registration Service (addService)
- Get Service (getService)
- Framework layer analysis
- How to use Binder
- How to use AIDL
- Binder summary
- Full analysis of Binder interview questions
Chapter 2: In-depth analysis of Handler. I
believe everyone has this feeling: There are so many articles analyzing the principle of Handler mechanism on the Internet, so why do you have to superfluously organize this note? It’s not that the articles written by the former people are not good, but I just think that their writing is not detailed, some points are not clear, and the logic is difficult to fluent. Every time I learn something, it feels uncomfortable.
This chapter starts with macro-theoretical analysis and Message source code analysis, then to MessageQueue source code analysis, Looper source code analysis, handler source code analysis, and Handler mechanism implementation principle summary. Finally, I also sorted out all the Handler interview questions.
The Handler chapter is very long, but the idea is gradual. If you can persist in reading it, I believe you will not be disappointed.
Chapter 3: Dalvik VM Process System
Andorid system startup, init process, Zygote, SystemServer startup process, application creation and use, activity creation, destruction Handler and Looper.
Chapter 4 In-depth analysis of WMS
The working principle of the animation frame View of the window management frame system.
The fifth piece PackagerManagerService
Package management services. Resource management related classes
to sum up
[Android detailed knowledge point mind map (skill tree)]
I personally do Android development. I have been doing Android development for more than ten years. I am currently working as a CTO and system architect in a startup company. Although Android is not as hot as in previous years, the era of finding high-paying jobs with the four major components has passed. This can only show that the positions below the intermediate level of Android are saturated. Now senior engineers are still relatively lacking . Many senior positions give very high salaries (you may not be able to find a suitable one if you have more money), so I strive to become a senior engineer. is the most important.
Attached here are dozens of sets of ByteDance related to the above-mentioned interview questions, interview questions from JD.com, Xiaomi, Tencent, Toutiao, Ali, Meituan and other companies in 19 years. The technical points are organized into videos and PDFs (in fact, it took a lot of effort than expected), including knowledge + many details.
Due to limited space, I will show you a small part in the form of pictures.
The detailed arrangement can be seen on GitHub;
Android architecture video + BAT interview topic PDF + study notes
There are a lot of materials for learning Android on the Internet, but if the knowledge learned is not structured, and when you encounter problems, you just taste it and don’t study it in depth, then it is difficult to achieve real technological improvement. I hope this systematic technical system can provide you with a direction reference.
There are a lot of materials for learning Android on the Internet, but if the knowledge learned is not structured, and when you encounter problems, you just taste it and don’t study it in depth, then it is difficult to achieve real technological improvement. I hope this systematic technical system can provide you with a direction reference.
Finally, I would like to give everyone a word and encourage each other!