beginning
The development of technology has created the position of programmer. Judging from the income levels of some employees exposed by major Internet companies in recent years, the salary of programmers is still relatively high, but we have heard another voice on the Internet, many Programmers want to change careers, especially older programmers, which may make many people wonder. Why do you want to change careers with such a high salary? In fact, they are also very helpless, as can be seen from the following points.
One, java related
java basics
1. The difference between == and equals and hashCode in java
2. How many bytes each of int, char and long occupies
3. The difference between int and integer
4. Talk about the understanding of java polymorphism
5. The difference between String, StringBuffer and StringBuilder
6. What is an internal class? The role of internal classes
7, the difference between abstract classes and interfacesjava advanced
1. Under what circumstances will objects be disposed of by the garbage collection mechanism?
2. Tell me about common encoding methods?
3. How many bytes does Chinese in utf-8 encoding occupy; how many bytes does int type?
4. What is the difference between a static proxy and a dynamic proxy, and in what scenarios?
5. Java's exception system
6. Talk about your understanding of parsing and dispatching.
7. Modify the signature of the equals method of object A, then when the HashMap is used to store this object instance, which equals method will be called?
##二、Picture related
1. Picture library comparison
2. LRUCache principle
3. Picture loading principle
4. How to implement the picture library by yourself?
5. Glide source code analysis
6. What cache does Glide use?
7. How to control the size of Glide memory cache?
8.Fresco source code analysis
3. Network and security mechanism
1. Network framework comparison and source code analysis
2. How to design network request framework by yourself?
3. Network request caching, how does okhttp handle network caching
4. Load a 10M picture from the network,
let’s talk about the precautions 5. TCP’s three-way handshake and four waved hands
6. The difference between
TCP and UDP 7. TCP and UDP Application
8. HTTP protocol
Four, database related
1. Sqlite upgrade, adding field statements
2. Database framework comparison and source code analysis
3. Database optimization
4. Database data migration issues
5. Sqlite common exceptions
Five, plug-in, modularization, componentization, hot fix, incremental update, Gradle
1. Understanding of hot repair and plug-in
2. Analysis of plug-in principles
3. Modularization (benefits, reasons)
4. Hot repair and plug-in
5. Understanding of project componentization
6. Description clearly and click the build button of Android Studio What happened after
Six, architecture design and design patterns
1. Talk about your understanding of Android design patterns
2. MVC MVP MVVM principles and differences
3. What design patterns do you know?
4. Commonly used design patterns in the project
5. Handwritten producer/consumer pattern
6. Write the code of observer pattern
7. Adapter pattern, decorator pattern, appearance pattern similarities and differences?
8. Talk about the understanding of RxJava
Seven, performance optimization topics
1. Start the app, black and white screen optimization
2. Stability-memory optimization
3. Smooth-Caton optimization
4. Saving-power consumption optimization
5. Installation package-APK slimming
6. Cold start and hot start
7. Memory leak Scenarios and solutions
- Bitmap optimization
9.webview optimization
8. Android Framework related
1. Android system architecture
2. View event distribution mechanism? How to resolve sliding conflicts?
3. What is the drawing process of View?
4. Cross-process communication.
5. What is the startup process of the Android system?
6. Let's talk about the startup process of the four major components, the startup and destruction methods of the four major components.
7. Understand Window and WindowManager.
8. In general, explain what happens when an application is installed on the phone?
Nine, Android excellent tripartite library source code
1. Network underlying framework: OkHttp implementation principle
2. Network packaging framework: Retrofifit implementation principle
3. Responsive programming framework: RxJava implementation principle
4. Picture loading framework: Glide implementation principle
5. Event bus framework: EventBus implementation principle
6. Memory leak Detection framework: LeakCanary realization principle
7. Dependency injection framework: ButterKnife realization principle
8. Dependence on global management framework: Dagger2 realization principle
9. Database framework: GreenDao realization principle
At last
In fact, there are so many knowledge points in Android development, and there are still a few things to ask in interviews. Therefore, there are no other tricks for the interview, just look at how well you prepare for these knowledge points. So, when you go out for an interview, it is good to see which stage you have reached in your review.
The picture below shows the high-frequency interview questions I have accumulated over the years of Tencent, Toutiao, Ali, Meituan, ByteDance and other companies in 2019-2021 . The blogger also organized these technical points into video and PDF (actual It took a lot more energy than expected), including knowledge + many details
The above [Interview Questions for Senior Engineers from Major Manufacturers], [Android Advanced Advanced Teaching Video], [Android Advanced Knowledge Point Learning PDF] are all free to share with you. If necessary, click ** [Android Architecture Video + BATJ Interview Special PDF + Study Notes] ** to get it for free.
D%E4%BC%9A%E8%BF%99%E4%BA%9B%EF%BC%9F%E5%A6%82%E4%BD%95%E9%9D%A2%E8%AF%95% E6%8B%BF%E9%AB%98%E8%96%AA%EF%BC%81.md)** can be obtained for free.
It is not easy to sort out, I hope you will pay attention to forwarding, thank you! I wish you all get your favorite job.