Preface
First of all, I will introduce myself, the computer is not a good candidate for the postgraduate entrance examination. I used to intern in the algorithm department of a company in Imperial Capital. The company is a big company. However, my personal hobby is more development. When I was sophomore, I wrote an app, mainly using various frameworks.
Let's take a look at the third side of Tencent Microvision. What did the interviewers ask? How much can you answer?
-
Use of ArrayList, and then ask him if he has encountered any pits in the process of using ArrayList;
-
I also asked HashMap for about 20 minutes. There are also aba problems, GC algorithms, and generic margins;
-
Then I asked why the loop method in the handler did not cause the thread to freeze, and the principle of animation, and asked him if he had actually battled tween animation; what is the most difficult bug collected above bugly, and how to solve it?
-
There is also the meaning of MeasureSpec. I asked how to calculate MeasureSpec in general; the difference between custom View and custom ViewGroup; the scheduling process of onmeasure, onLayout, and onDraw; the measure timing of custom View; have you written custom View;
-
Asked about the pits in the use of Glide and the pits in the use of EventBus;
-
There is also the caching mechanism in the network protocol okhttp, the dex loading process, and the principle of componentization;
-
There are also the pits and solutions encountered in the life cycle management of Fragment;
-
There are also sorting algorithms, as well as observer mode and singleton mode, and asked about the relationship between abstract classes and interfaces;
-
There is also the application startup process, activity startup process, why each application has its own virtual machine, and the relationship between this virtual machine and the JVM.
From these questions asked by Tencent interviewers, it can be seen that many things asked in interviews are based on principles .
"MuMu" even complained to me: "Damn, is it so difficult to interview senior engineers now?"
Yes, the requirements for senior Android engineers are so high, and the salary is also high!
**It is true that the overall environment this year is more severe, but some senior positions are still scarce. ** And most programmers are often slow to advance from junior level to mid-level senior level. Even like my friend, five years of experience still fails to win the offer of senior engineer, sometimes the bonus points for working years are not enough. .
At last
It is said that three years is a hurdle for programmers, whether they can be promoted or improve their core competitiveness, these few years are very critical.
With the rapid development of technology, from what aspects can we learn to reach the level of senior engineer and finally advance to Android architect/technical expert? I have summarized these 5 big pieces;
I have collected and sorted out the interview questions of Alibaba, Tencent, ByteDance, Huawei, Xiaomi and other companies in the past few years, and sorted out the requirements and technical points of the interview into a large and comprehensive "Android Architect" interview PDF (in fact, more than Expected to spend a lot of energy), including the knowledge context + branch details.
Java language and principles;
big factory, small factory. Android interview first see if you are familiar with the Java language
Advanced UI and custom view;
custom view, the basic skills of Android development.
Performance tuning;
data structure algorithms, design patterns. All of the key foundations and key points need to be skilled.
NDK development;
future direction, high salary is bound to be.
Cutting-edge technology;
componentization, hot upgrade, hot repair, frame design
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 stop studying it in depth, then it is difficult to achieve real technological improvement. I hope that this systematic technical system will provide you with a direction reference.
When I was building these technical frameworks, I also sorted out the advanced advanced tutorials of the system, which will be much better than my own fragmented learning effect, visible on GitHub; "Android Architecture Video + Study Notes"
Of course, it is not easy to learn and master these abilities in depth. Everyone knows how to learn and what work intensity is as a programmer, but no matter how busy the work is, I have to spare 2 hours a week to study.
Within half a year, you will be able to see the changes!
Everyone knows how to learn and what work intensity is as a programmer, but no matter how busy the work is, I have to spare 2 hours a week to study.
Within half a year, you will be able to see the changes!