Apart from bugs, what is the biggest headache for you? single? Bald? 996? Interview to build rockets, work screws?
As an Android developer, in addition to bugs, you often encounter the following problems:
Application freezes, dropped frames, torn screens, slow refresh of the operation interface, unsightly UI, messy layout... If these problems occur frequently, they may not be used in a year.
When developing an App, do you feel the interface freezes? Especially when customizing the View.
Most of the factors that affect user experience such as freezing and frame loss of Android applications are related to the value of 16ms. The refresh rate of the Android device is also 60Hz. The Android system sends out a VSYNC signal every 16ms to trigger the rendering of the UI. If it exceeds 16ms, we think that a stutter has occurred.
In the interview, in addition to the algorithm questions, the other brothers were turned into brothers. I did not expect the interviewer to give it to him. After three faces a day and a week later, I received the oc. I felt very lucky and finally got the approval of the big factory (although it is a cabbage ). It is suggested that if netizens have their own bright spots, they can still try big companies bravely and boldly. After all, in addition to strength, luck and opportunity also account for a large part. If you meet an interviewer who appreciates you, it will be smoother.
Dedicated to Baidu's Three Faces~
one side:
0. After introducing myself, talk about the project, from the first to the last;
1. Asked what are the common layouts;
2. What are the Activity life cycles, and under what circumstances will they be called back;
3. Ask about inter-process communication, binder, pipe, socket, etc.;
4. Ask about the delivery of View events, activity-window-decorview-view;
5. How the event is transmitted from the finger to the activity;
6. How are LongClick and OnClick triggered respectively;
7. Talk about the Java class loader, what are the Android class loader, and what is the Android top class loader;
8. How to load a class by yourself without letting the parent loader load it, if you load it yourself, how to resolve the references of other class loader;
9. Talk about memory optimization (memory leaks, large object optimization, etc.);
10. Talk about openGL (take an example, make a picture in picture);
11. Talk about netty (mentioned in the previous project), based on what threading model, why can carry high concurrency;
12. Talk about what you are best at (talking about x86 project transplantation, algorithm optimization);
13. Write a sorting algorithm, how much time complexity is, how to optimize it (written merge, said Garhill);
14. Write a commonly used animation.
Two sides:
1. Introduce yourself?
2. Find the Kth largest element in a large array?
3. Project related?
4. What language are you good at? Scripting language?
5. Three handshake?
6. What is the length of the UDP data packet?
7. Research experience?
8. Recently read books?
9. Knowledge of Linux environment?
10. What are the status of the process?
11. What do you think is your advantage?
12. What difficulties do you encounter in the usual learning and development process?
13. How many papers have been published?
14. The difference between process and thread? Thread Pool?
15. What issues should be paid attention to in multi-threading?
16. What do you want to ask?
Three sides:
1. Project? Project difficulty? How long did it take?
2. What are the shortest path algorithms? If the speed is not enough, how do you optimize?
3. Which books are you reading recently?
4. What technologies do you usually pay attention to?
5. Understanding of processes and threads? When to use processes and when to use threads?
8. What are some of your usual study habits?
9. Team communication skills?
10. The most difficult thing encountered?
11. What are your advantages? What are the disadvantages?
13. How to choose OFFER? What factors are considered?
14. What do you want to ask?
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!
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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!