Interview summary: Why do interviewers in large factories always ask about the underlying principles of Framework?

Foreword

The competition in the Internet industry is also becoming more and more cruel. Only by constantly learning and improving our abilities can our engineers ensure that you get a better salary and enter the ideal enterprise(Alibaba, Byte, Tencent, Meituan, etc.)etc...)

But at present, many people have a series of doubts:

Can you meet the company's promotion standards with your current personal abilities?What are the interview requirements if you want to change jobs?This should be part of your confusion at the moment. Also, is there room for salary increase after you enter a big factory?How big is the space?…

In fact, the reason is very simple: in the final analysis, the salary depends on your own technology and ability. When your ability reaches a certain level, the salary and position will naturally increase.

Android programmers want to achieve a certain height, the following two points are indispensable

One, proficient in the application of Java or Kotlin, in-depth research on various open source libraries and the application of Android Framework underlying principles
Second, both horizontal and vertical emphasis, broadening knowledge at the same timeBe able to conduct in-depth research on technologies, understand the principles of various technologies, develop towards "T" type programmers, and gradually master the ability of tuning;

This is a long process, and it is impossible for most people to quickly grow into a system-level programmer in a limited time.Trapped in the current position, it is difficult to achieve horizontal and vertical development at the same time, and lack of learning and practical opportunities!

When our own skills meet the requirements, when we go to the interview, we must show our expertise in this field, and we must let the interviewer ask in-depth questions, so that you can convince him and let him recognize your personal ability!This gives us the illusion that the interview questions of large factories are very broad and do not dig deeply

I have compiled a mind map about Framework knowledge points here, because the picture is too large, only the outline is shown

Friends in need can send "brain map" via private message to get it for free

As a past person, I found that many interviewers have repeatedly encountered obstacles on the Android Framework.After all, it is always interspersed in the entire development life cycle of the app, whether it is from 0 to 1 in the establishment stage, or from 1 to 1.The N polishing stage is inseparable from the Framework.Therefore, knowledge related to it is particularly important, and the interviewer will test the edge of your relevant skills through a series of guns

For most programmers, Framework has been used for a long time, but there is still a situation where they are helpless in the face of difficult problems, mostly because the source code and underlying principles are vague

Some time agosorted out the knowledge brain map summary and source code study manual documents about Android Framework!Not only can consolidate core technical points such as underlying principles and source code analysis, but also be able to grasp the design solutions of complex system problems that are difficult for ordinary developers to reach; these have been organized into PDF documents,

If you need the full PDF document:You can private message "Brain Map" to get it for free

Summary

As a past person, I found that many learners and practitioners are facing a lot of troubles on the Android Framework, such as:

• When encountering problems in the work scene, often we can only rely on blind guessing and feeling, and use temporary remedies to cover up the problem, which seems to solve the problem, but the same problem will be the next timeIt will happen again, the reason is the lack of methodology, thinking guidance and tool support;

• In the process of ability training, there is a lack of the practical environment of Internet projects. Framework can only be imagined through theoretical knowledge, and cannot understand its true face and practical process in actual work;

• In career promotion, I only focus on functional development without understanding the underlying principles, lack of in-depth thinking and summary, unable to complete complex system design such high-level work, it is difficult to perform well at workFist, and challenging work is often reserved for those who are prepared.

In short, once a problem is encountered, few people can reverse it from point to point, and finally find the bottleneck point and the optimal solution. Framework is the deep water area of ​​Android development.It is also a measure of the ability of an Android programmer

Finally I want to say

Technology is endless, you need to be responsible for every line of code you submit, every tool you use, and constantly dig out its underlying principles in order to sublimate your technology to a higher level

The road to Android architect is still very long, and I will share with you