beginning
Usually, as an Android APP developer, we don’t care about the implementation of Android source code. However, with more and more Android developers, companies are more and more interested in a programmer’s understanding of the underlying Android when selecting Android programmers. Thinking , the bottom layer here is mainly the operating principle of each component in Android Framewok, such as the operating mechanism of Binder, the role of ServiceManager, and so on.
In the Android interview, questions about Framework are necessary, but have you mastered these high-frequency interview questions about Byte Beat Framework?
Let's take a look at the third aspect of Tencent Microvision. What did the interviewers ask? How much can you answer?
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Use of ArrayList, and then ask him if he has encountered any pits in the process of using ArrayList;
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I also asked HashMap for about 20 minutes. There are also aba problems, GC algorithms, and generic margins;
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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?
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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;
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Asked about the pits in the use of Glide and the pits in the use of EventBus;
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There is also the caching mechanism in the network protocol okhttp, the dex loading process, and the principle of componentization;
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There are also the pits and solutions encountered in the life cycle management of Fragment;
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There are also sorting algorithms, as well as observer mode and singleton mode, and asked about the relationship between abstract classes and interfaces;
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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. .
To become a senior engineer, it is necessary to learn how to customize View.
to sum up
Finally, the editor wants to say: No matter what direction you choose to develop in the future, it is important to learn Android technology well. After all, for programmers, there are too many knowledge content and technology to learn, if you don’t want to be affected by the environment Elimination is the only way to continuously improve ourselves. We have always adapted to the environment, not the environment to adapt to us!
Here are dozens of sets of Android interview questions compiled by Tencent, ByteDance, JD, Xiaomi, Toutiao, Ali, Meituan and other companies in 19 years. The technical points are organized into videos and PDFs (actually, 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 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 the questions are just a tad, no further research, it is difficult to achieve real technical improvement. I hope that this systematic technical system will provide you with a direction reference.
The road to technological advancement is very long, let's encourage together~