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. .
Write at the end
In the technical field, there is no single course that you can do once and for all after you finish it. The best course can only be "the master leads the door, and the practice depends on the individual." The phrase "learning without end" is not only a good habit in any technical field, but also a necessary prerequisite for programmers and engineers not to be eliminated by the times and to obtain better opportunities and development.
If you feel that your learning efficiency is low and you lack correct guidance, you can join a technical circle with rich resources and a strong learning atmosphere to learn and communicate together !
Join us! There are many first-line technical experts in the group, as well as code farmers who are struggling in small factories or outsourcing companies. We are committed to creating an equal and high-quality Android communication circle. It may not be possible to make everyone’s technology advance by leaps and bounds in the short term. In the long run, vision, pattern, and long-term development direction are the most important.
The 35-year-old middle-aged crisis is mostly caused by being led by short-term interests and squeezing out the value prematurely. If you can establish a correct long-term career plan from the beginning. After 35, you will only be more valuable than the people around you.