Preface
First of all, I will introduce myself, the computer is not a good candidate for the postgraduate entrance examination. I had an internship in the algorithm department of a company in the Imperial Capital before. The company is a big company. However, my hobby is more development. When I was sophomore, I wrote an app, mainly using various frameworks.
The apps of first-line enterprises are multi-threaded and multi-process, while the Android inter-process communication mechanism is Binder, and the native inter-thread communication is Handler. Binder and Handler are a knowledge point that must be mastered to understand the Android operating mechanism, and it is a first-line Knowledge points must be asked in corporate interviews!
The following are the real interview questions that Dachang frequently asked about Binder:
- What are the advantages of Binder? (Byte beating)
- How does Binder make one copy? (Tencent)
- Explanation of the principle of MMAP; (Tencent)
- Why can't Intent deliver big data? (Ali)
- Describe the details of the java classes generated by AIDL; (byte beating)
- The communication mechanism at the bottom of the four major components; (byte beating)
- Why can't Intent deliver big data? (Ali)
- How does the Binder mechanism cross-process?
- Binder mechanism principle
In order to let everyone better grasp the principles of Framework and Binder, today I will share a summary of Android Framework high-frequency interview questions and BATJ Daniel's notes on Android Framework kernel analysis . After reading it, if you don’t believe you still don’t know Framework and Binder.
Android Framework high-frequency interview questions analysis
1. AMS 、PMS
- AMS overview
- AMS startup process
- AMS and process start
- AMS family
- PMS
2. Activity start process, App start process
- Activity start mode
- What is the Zygote process
- The startup process of the Zygote process
- SystemServer process startup process
- Start service
3. Binder mechanism (use of IPC and AIDL)
- What is AIDL and how to use it
- What is the full name of AIDL? How does it work? What types of data can be processed?
- Android's IPC communication method, what are the thread (inter-process) communication mechanisms
4. Why use Parcelable and what are the benefits?
- Implementation Mechanism
5. Android image display related process, Vsync signal, etc.
- Analysis of Android Vsync principle
- Double buffering
- Triple buffering
At last
That’s all for today’s sharing of interviews. It’s the same sentence. There are some things that you must not only understand, but also express them well, so that the interviewer can recognize your understanding, such as the Handler mechanism. This is a must-question question in the interview. . There are some obscure points, maybe it only lives in the interview, you will not use it at all in actual work, but you have to know what it is.
Finally, the editor here shares a collection of dozens of interview questions from Tencent, Toutiao, Ali, Meituan and other companies related to the above-mentioned technical system diagram. The technical points are organized into videos and PDFs (actually better than expected I spent a lot of effort), including knowledge + many details . Due to the limited space, here is a part of it in the form of pictures.
There are also advanced architecture technology advanced brain maps, Android development interview topic materials , advanced advanced architecture materials to help you learn to improve the advanced level, and save everyone's time to search for materials on the Internet to learn, and you can also share with friends around you to learn together.
Android learning PDF+architecture video+interview document+source notes collection
[Android core advanced technology PDF document, analysis of real questions in BAT interview]
[Algorithm Collection]
[Extend the essential knowledge of Android]
[Android part of the advanced architecture video learning resources]
Essential knowledge of ndroid】**
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[Android part of the advanced architecture video learning resources]
After receiving and learning the Android Introductory Video, it is even more powerful! Enter the BATJ factory and so on (preparation)! Nowadays, it’s said that the Internet is cold. In fact, you get in the wrong car and wear less (skills). If you get in the right car and your own technical ability is strong enough, the cost of the company’s replacement is high. How could you be laid off? It's just to eliminate the end business Curd! Nowadays, there is a flood of junior programmers in the market. This set of tutorials is aimed at Android development engineers who are 1-6 years old. They are in a bottleneck period. Those who want to break through their salary increases in the next year, advanced Android intermediate and senior, architects are even more important to you. Like a fish in water, get it quickly!