Preface
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If you also learn Android, then you will probably have read my article. Readers often leave messages to me: "How do I learn Android?", "What is the daily way to learn Android".
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So, today, I will present an "Android Knowledge Graph" , based on my own experience & what I have seen and heard, to tell you what you actually need to learn to learn Android , I hope you will like it.
Alibaba
I still remember some of the interview questions. Some of them have been forgotten. In order to prevent forgetting, I wrote them down.
1: How do you understand the Android operating system.
2: Are you familiar with the framework layer? If you are familiar, then give an introduction to the framework.
3: Are you familiar with multithreading, if familiar, introduce threads.
4: Whether object locks and class locks affect each other, will give you an example to let you judge whether the lock is used properly, and tell the reason.
5: Are you familiar with the Lopper architecture, if you are familiar with the principle, if you implement it yourself, how will you implement it? Here we mainly examine the principle of blocking message queues and its variants.
6: The principle of custom controls, and the message distribution process.
7: The working principle of binder.
8: The working principle of ActivityThread, Ams, Wms.
9: If you need to modify the framework at work, how do you find the entry point?
There is so much content in the telephone interview. I felt that I gave the answer 75 points, and then I waited for the notification; after another two days, Ali’s HR called me to go to the designated place for an interview. I was a little nervous because I wanted to work for Jack Ma. Too much, the intensity of competition can be imagined
Xiaomi
One side, two sides
1. Introduce the binder and principle
2.Measure layout draw process, sliding conflict
3. Commonly used multi-threaded tools. blockingqueue, concurrenthashmap, semaphore, countdownlatch, cyclicbarrier, exchange, etc., stringbuffer
4. The difference between stringbuilder and stringbuffer
5. The principle of lock and syncrognized is different, and what scenarios are suitable for.
6. Realize producer, consumer
7. Handler principle, how to realize delay.
8. An activity starts the life cycle of another activity.
Algorithm question:
1 Reverse linked list
2. Merge sort
3. Quick sort
4. feiboqiena sequence
5. Binary search
6. Two queue implementation stack
7. Two stacks realize the queue.
8. Determine whether the linked list is in a ring, and find the intersection of the ring.
Bytedance Interview
one side
1: Plug-inization. Start the hook method of the activity. taskAffity.
2: Does okhttp support HTTP2? What are the functions of http2? Congestion control in tcp? Tsl's handshake and specific asymmetric encryption algorithm. Asymmetric name
3: How the handler's post (Runnable) is implemented. The execution priority of callback, runnable, and msg.
4: How is blocking achieved? Why not block the main thread?
5: Find the maximum distance between two nodes in the binary tree.
6: 206 meaning, which is the unmodified resource, 302 meaning, 301 meaning
7: Multi-process communication problem. Binder advantage. Details of java classes generated by aidl. What problems do multi-process encounters?
8: What are the parameters passed by the dynamic agent? Can non-interface classes implement dynamic proxy? Principle of ASM
9: What is the difference between Application and Activity in the Context inheritance tree? What is the difference in the use of the two?
10: Any binary tree, find the maximum node distance
Two sides
1: Design a log system.
2: Classification of memory leaks. How to check the memory leak
3: The touch event source code problem.
4: The problem of componentization. The difference between module and app. How moduler communication is achieved.
5: How to deal with log collection of native crash?
6: The annotation implements a prompt function: if the value of int is greater than 3, a prompt is required.
Three sides
1: Introduce the startup process of flutter
2: Introduce the difference between flutter and weex
3: Introduction to componentization
4: What are the means of communicating with js in webview?
5: Introduce the principle of flutter_boost
All sides
1: The characteristics and usage scenarios of the adapter and the decoration mode
2: How does the video codec work?
3: Three-color ball sorting
Side Why work for a year wanted to change jobs? The principle of onTouchEvent/onTouchListenr.onTcouchEvent/onClickListenrhashmap? The difference between java's hashcode and equals How much do you know about java's gc? Is the companion object of kt hungry or lazy? The principle of handler.postDelayed How to generate ANR? How to capture? Intelligence question: There are 101 cakes on the table. *** takes the first hand and he takes the second hand. How do you need to win tcp? Three handshake/four waves, why do you need three handshake and four waves? What is a memory leak? How to find? Algorithm question: Fibonacci sequence, how to optimize the recursive method?
Two faces hand wash is how such a large app iterations up? You know the principle applet it? How to do v8binding? What is the value of your project? How to do picture caching? How do you design an image caching framework? How to achieve lrucache? Why is the time complexity of o(1)? voliate keyword explanation? What can't the voliate keyword achieve? What are the common symmetric encryption algorithms and asymmetric encryption algorithms under the https explanation? How do you design a management system? If the process is killed or the background is switched, how can the data be saved and lost? How do you design a threading model for the embedded point system? Quick sort? Is quicksort stable? How to achieve the stability of a quick sort? How is minstack designed? What are the problems with mixing kotlin and java? Design a data structure. How can someone post an article in Weibo? How can attention be achieved? Someone has posted an article on Weibo, how can people who follow get the latest 10 articles? How to get the latest 1000 articles of the people I follow? Design an efficient algorithm
Three sides Why did you choose to change jobs? How are the people in your group? How do you solve the difficulties in the project? What troubles have you encountered in your work? How do you usually study? What books do you read besides studying?
Learn to share
In the current era of information sharing, many resources can be found on the Internet, depending on whether you are willing to find or find the right method.
Many friends are not without information, most of them have dozens or hundreds of Gs, but they are messy and they don’t know how to look from where to look, or even forget after they look.
If you feel that the information you find on the Internet is very messy and out of structure, I will share a set for you. It is more systematic, and I usually study it myself.
The latest tens of thousands of pages of real interview questions in 2020
Seven module learning materials: such as NDK module development, Android framework architecture...
Only systematic and directional learning can quickly improve their skills within a period of time.
This system study notes is adapted to the crowd:
First, the learning knowledge is relatively fragmented, and there is no reasonable learning route and advanced direction.
Secondly, after several years of development, I don’t know how to go further, and I’m confused.
Third, at the right age, I don’t know how to develop, transform management, or strengthen technical research. If you need it, I happen to have why, don’t come to receive it! Maybe it can change your current state!
System study notes, adapt to the crowd:
First, the learning knowledge is relatively fragmented, and there is no reasonable learning route and advanced direction.
Secondly, after several years of development, I don’t know how to go further, and I’m confused.
Third, at the right age, I don’t know how to develop, transform management, or strengthen technical research. If you need it, I happen to have why, don’t come to receive it! Maybe it can change your current state!
Due to the large content of the article, the length of the article is not allowed, and part of the unshown content is displayed in the form of screenshots. If you need to get complete documentation, please click on my GitHub to get it for free.