What is Kotlin?
Kotlin, as mentioned earlier, is a JVM-based language developed by JetBrains. JetBrains is well known for creating a powerful Java development IDE. Android Studio, the official Android IDE, is based on Intellij as a plug-in for this platform.
Kotlin was created using the thinking of Java developers, with Intellij as its main development IDE. For Android developers, there are two interesting features:
For Java developers, Kotlin is very intuitive and very easy to learn. Most of the content of the language is very similar to what we know, and in different places, its basic concepts can also be quickly grasped.
It can be fully integrated with the IDE used in our daily life without configuration. Android Studio can understand, compile and run Kotlin code perfectly. And the support for this language comes from the company that developed this IDE, so we Android developers are first-class citizens.
However, when I was studying Flutter and Kotlin in the editor , I found that there was no special system and application learning materials that could explain the two technical points on the Internet. I looked through the websites of major platforms and found that I can really explain Flutter and Kotlin very thoroughly. Under the guidance of a big boss , I got this Flutter and Kotlin notebook, which comprehensively explained Flutter and Kotlin related knowledge.
Friends in need can get these two notes + all the documents at the end of the article!
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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The 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 a custom View and a custom ViewGroup; the scheduling process of onmeasure, onLayout, and onDraw; the measure timing of a custom View; have you ever written a 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 also asked about the relationship between abstract classes and interfaces;
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There is also the application startup process, the 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 that are 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 elementary to intermediate level. Even like my friend, five years of experience still fails to win the offer of a 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.
Finally, take a look at the "Android Framework Architecture (Advanced UI+FrameWork Source Code)" mind map of all the knowledge points needed for learning. All the content of the following knowledge points are included in the study notes just now! Part of it has been shown in the article! If you are worried about how to learn or want to improve the efficiency of learning this knowledge, then this study note is definitely your secret weapon!
arms!
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