I suddenly wanted to talk about the interview today . Why do you want to talk about the interview ? Because recently, many friends from the official account and the short book asked me to look at my resume, and many friends told me that the interview was abused again. The Rockets made it so terrible, and they all doubted their abilities. In fact, I want to say: normal, the reason for saying so is that many friends may not recognize some of their own problems. What are the problems?
Two points:
First, if you did not recognize your own technical strength, the review of three days of fishing and two days of surfing the net would not be effective in improving yourself;
The second is that I didn't really understand the company before going to the interview.
In fact, to be honest, as Android programmers, at least 80% of people want to work in large companies, such as: BAT, Xiaomi, Didi, Toutiao, Meituan, Huawei and other large companies or the mobile Internet industry Star enterprise.
The benefits of entering a large company are obvious. The benefits are good, the salary is high, and the job is stable . Unlike many small start-up companies that go bankrupt, especially after the mobile Internet enters the second half, many start-up companies have closed down one after another, and Android developers are getting more and more. Saturation , with more and more Android programmers, they naturally enter the harsh environment of fierce competition. The natural law of survival of the fittest is unavoidable and unavoidable.
According to GitHub statistics, there are 700,000 Chinese programmers who joined GitHub this year. One can imagine how fierce competition is now.
Even if 20% of programmers do not want to enter a large company, it is nothing more than recognizing their reality, they are not so talented, and they are not so passionate about programming. They have a self-knowledge mentality and work in a small company. It’s good, it’s a big deal if it’s closed, and I can’t get in anyway, BAT. Either they are the great gods of BAT who want to start a business and become an entrepreneur in the mobile internet industry. If you want to succeed, even if the entrepreneurship fails, I can still stand out from the crowd and return to the BAT world with a handsome face. good job.
As he said, it seemed a bit like the law of twenty-eight. NO, the above 80% and 20% are my own incomplete statistics, don't take it seriously, just give an example.
What are the factors that make Android programmers interview successful?
Regarding the interview, I think we all have to understand these two interview criteria:
First criterion
Today, when the mobile Internet enters the second half, technical capabilities are taking up an increasing proportion. If you want a long-term existence in a company, you can only continuously improve your own technical strength. You have to know that capital is Will not raise idlers. As an idler, every minute of capital has to pay every minute of salary. Do you think the boss will agree?
This is not an era in which a satisfactory salary can be obtained by meeting the four major components. After waves of elimination and shuffling, what is left is technical gold. Just as the big waves fade, those who swim naked will slowly come ashore. If you want the banner of victory to hang on your white sails, the only way out is to keep learning and advancing.
Second criterion
That's why I suggest that friends have to go to a big company for interviews? You see, now we have gradually entered the era of fighting technology, so technology is still becoming more and more important, and this cannot be reflected and improved in small companies.
The reason why you are hit is because you can complete projects and products independently, even very well, but the basis of the failed interview is too poor. So, you can really master and do a project in a small company, but a big company values your foundation.
Therefore, we must be clear about this criterion: In interviews, large companies focus on foundation and depth, while small companies focus on ability (the ability here refers to the ability to start a project right away).
How do Android programmers prepare for interviews in advance?
As I said earlier, the horrible interview is caused by two problems. One is that you don’t recognize yourself; the other is that you don’t understand the company. To sum up in one sentence is insufficient preparation. So how do you prepare well before the interview?
What I want to share today is an "Android Interview Collection" first published by Meituan technical experts. The popular Android interview knowledge points collected from the Internet's first and second-tier companies, people really have to recommend it. It's too complete!
"Android Interview Collection" PDF full HD version—————— (pack it for free here) , friends who feel helpful and in need can like it
Android basic knowledge points
- The life cycle of the four major components
- Communication between activities
- When switching between horizontal and vertical screens, the life cycle of Activity in various situations
- Life cycle comparison between Activity and Fragment
- The life cycle when the Home button is pressed when there is a Dialog on the Activity
- Which methods must be executed when jumping between two activities?
- The foreground switches to the background, and then back to the foreground, Activity life cycle callback method
- Comparison of the four startup modes of Activity
- Activity state is saved in recovery
- How to manage the life cycle of fragment in various situations
- What is the principle of opening the Service?
- Please describe the life cycle of Service
- Please describe the understanding of broadcast BroadcastReceiver, the classification of broadcast, and what is the underlying principle of communication?
- AlertDialog, popupWindow, Activity difference
- The difference between Application and Activity Context object
- Android attribute animation characteristics
- How to import an external database?
- Features and comparison of LinearLayout, RelativeLayout, FrameLayout, and introduces usage scenarios
- Talk about the understanding of interfaces and callbacks
- Introduce SurfceView, what is its application scenario, and what is the difference between it and ordinary View?
- The role of serialization, and the difference between the two Android serialization
- Differential
- Estimator
- Data storage method in Android
Android source code analysis
- Android animation framework implementation principle
- The difference between Android versions of API
- The difference and relation of Requestlayout, onlayout, onDraw, DrawChild
- The difference and use of invalidate and postInvalidate
- The difference between Activity-Window-View
- How to optimize a custom view, and what is your general direction for optimization?
- How does the low version SDK implement the high version api?
- Describe the flow of a network request
- HttpUrlConnection and okhttp relationship
- Understanding of Bitmap objects
- looper architecture
- How ActivityThread, AMS, WMS work
- How does custom View consider model adaptation
- What is the difference between AstncTask+HttpClient and AsyncHttpClient?
- LaunchMode application scenarios
- How to use AsyncTask?
- SpareArray principle
- Several ways of communication between AndroidService and Activity
- What is the principle and function of IntentService?
- Talk about the relationship between Activity, Intent, and Service
- The difference between ApplicationContext and ActivityContext
- Is the SP process synchronized? Is there any way to achieve synchronization?
- Talk about the use of multithreading in Android
- Process and Application life cycle
- How to know the size of the view when encapsulating the View
- RecycleView principle, how to avoid memory problems caused by RecycleView
- The role and understanding of AndroidManifest
Some common principle problems
- Handler mechanism and underlying implementation
- The difference between Handler, Thread and HandlerThread
- The handler sends a message to the child thread, how does the looper start?
- Regarding Handler, where is the new Handler thread?
- ThreadLocal principle, implementation and how to ensure the Local property?
- Please explain the relationship between Message, Handler, Message Queue, Looper in the single-threaded model
- Please describe the View event delivery and distribution mechanism
- Touch event delivery process
- What is the difference between onTouch and onTouchEvent in event distribution, and how to use it?
- What are the callback methods related to event distribution for View and ViewGroup respectively
- View refresh mechanism
- View drawing process
- Principles of Custom Controls
- How does a custom View provide an interface for obtaining View properties?
- Realize WAP mode networking in Android code
- AsyncTask mechanism
- AsyncTask principles and shortcomings
- How to cancel AsyncTask?
- Why can't I update the UI in the child thread?
- What is the reason for ANR?
- ANR positioning and correction
- What is oom?
- What causes oom?
- Is there any solution to avoid OOM?
- Can oom try catch? why
- What is a memory leak?
- What causes the memory leak?
- How to prevent thread memory leaks?
- Solution to memory leak field
- Difference between memory leak and memory overflow?
- LruCache default cache size
- ContentProvider permission management
- How to intercept and abort a text message via broadcast?
- Can the broadcast request the network?
- What is the time limit for broadcasting to cause anr?
- Calculate the nesting level of a view
- Activity stack
- Is there an upper limit for Android threads?
- Is there an upper limit for the thread pool?
- Why does Android introduce Parcelable?
- Have you tried to simplify the use of Parcelable?
- Can the loading process of the dex file be described?
"Android Interview Collection" mind map display:
to sum up
Say a thousand words and ten thousand, it is better to act on your own. If you want to have a place in the second half of the mobile Internet, you have to start advanced learning now. From today on, you will immediately require yourself to pay attention to both business realization ability and foundation and principles.
Only when the foundation is consolidated can the high-rise buildings rise on the ground, as stable as Mount Tai. In order to be calm and unhurried in the interview, to overwhelm the interviewer. Next time you brag to the interviewer, you can say this: If three pairs of stars cheat at the same time, my program will not be paralyzed.
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