What is the outlook for Android development? 2021 Android developer's job-hopping guide, learning route + knowledge points combing

beginning

Generally speaking, there are three reasons why middle-aged programmers are easily eliminated.
1. The output capacity has reached its peak. This person has been struggling for more than ten years and is still doing nothing. It is obvious that this person's ceiling is like this. To put it bluntly, this is the talent.
2. The ability to adapt is getting worse. Being old, having a family, old fritters, decreased learning ability, working hard, etc.
3. The cost performance is gradually decreasing. By the age of 35, the annual salary will not be low, but the output capacity has reached the ceiling. As the age gradually increases, the cost performance will become lower and lower. Let's just talk about the classic sentence: Substitution is too high. 25-year-old young people are cheap and promising, 35-year-old has realized the talent price is still high, when the two choices are similar, how do you think the company will choose...Anyone who becomes a boss will choose the former. And how to increase their irreplaceability?

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These are questions that are often asked in interviews with first-line Internet companies such as Tencent, ByteDance, Meituan, and Ali. I have classified these knowledge points according to the knowledge framework, so that you can check and review them easily. Familiar with the knowledge points in the materials will greatly increase the probability of passing the first two rounds of technical interviews.

Because there are many interview questions involved, the length is longer, so there is a way to receive them at the end of the article!

java aspect

1. Usage analysis of four Java thread pools
2. How many file copy methods does Java have? Which one is the most efficient?
3. Use FileChannel (file channel) to achieve fast file copy
4. JVM class loading mechanism detailed JVM class loading process
5. JVM class loading mechanism detailed class loader and parent delegation model
6. Several ways to achieve thread synchronization in Java
7. Java memory management: deep into the Java memory area
8. ………………

computer network

1. The soul of HTTP, consolidate your HTTP knowledge system (intensive reading is recommended)
2. Analysis of HTTPS principle and its use in Android
3. HTTP resumable transmission (blocked transmission)
4. What is the principle of HttpDns
5. Implementation of HttpDns access and global replacement
6. The difference between TCP, UDP, HTTP, SOCKET
7. ………………

operating system

1. The difference between thread and process (what is the resource allocation)
2. Process communication
3. Memory space allocation
4. Deadlock The conditions of the deadlock (detailed example) Methods to avoid deadlock
5. ………………

Design Patterns

1. Generally speaking, you know which modes you know, and you must explain the applicable scenarios
2. Singleton mode, lazy man, hungry man, thread safety, double lock
3. Observer mode
4. Adapter mode
5. Appearance mode
6. ………………

android aspect (generally asked according to the project)

1. android process communication
2. service
3. handlerThread
4. handler operation mechanism 1 time
5. recyclerView caching mechanism 1 time
6. view redraw
7. ………………

Project aspect

1. Interaction between fragment and activity
2. What is the safety of using webview? And js call each other
3. How to ensure that there is no conflict when reading and writing files in the process of resuming transfer description
4. Asynctask memory leak why the leak solution what is the debugging tool
5. MFCC process recording session (Quick hands asked a lot of details and asked to write pseudo code)
6. MVP
7. The difference between recyclerView and listview caching mechanism too many items will memory leak

end

In a blink of an eye, time really flies. We ran our own things and embarked on our own journey, but even if we haven't seen each other for many years, we are still as "close" as before because of this friendship. Do not forget the original intention and always have to go. Come on, programmers, in my opinion 35 years old, 40 years old is never a crisis, as long as you never forget why you embarked on the journey!

Finally, if you need the same information, you can **Private message I click [ Learn ]** I am willing to share with you!

In order to let more friends who are studying or preparing for an interview see this article, I hope you can comment more, like + forward!

Thanks again to all the friends who have provided me with questions, and thank you for being there!