Shulou(Shulou.com)06/03 Report--

From the example analysis of java language to the principle of AIDL, it is believed that many inexperienced people are at a loss about this. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

I. intermediate and advanced Java

1. Talk about the understanding of java polymorphism? 2. What design patterns do you know? 3. What is the difference between static agents and dynamic agents? 5. What is the difference between simple factories, factory methods, abstract factories, and Builder patterns? 6. What is the difference between the decoration mode and the agent mode? Compared with the bridging mode? 7. Collection framework, what are the specific implementation classes of list,map,set? what are the differences? 8. What are the main differences between HashMap and HashTable? What is the underlying data structure implemented by both 9, HashMap, ConcurrentHashMap, hash () related principle analysis? 10. What is your understanding of Java reflex? 11. Introduce generics, generic erasure and related concepts, parsing and dispatching in java. 12. The char of Java is two bytes. How do you store the characters of Utf-8? 13. Do you have an in-depth understanding of the storage form of strings in memory? 14. Understanding of java virtual machine instructions (advanced) 15. What is a thread pool and how to use it? Why use thread pools? 16. The principle of synchronized? 17. What is the usage scenario of multithreading? 18. Understanding of JVM's memory model? 19. Describe the principle and recycling strategy of GC? 20. Class loader, parent mechanism, Android class loader. 21. What is the difference between stack memory and heap memory in Java's virtual machine JVM? 22. What are the common command-line tools for JVM, Art, Dalvik, comparison 23 and JVM tuning? What are the common tuning parameters for JVM? .

II. Computer network

1. What's the difference between HTTP and HTTPS? 2, the new features of HTTP2.0 compared with HTTP1.X 3, the solution to slow Https requests 4, the protocol composition of Http's request and response 5, talk about the understanding of http cache. 6. Https encryption principle. 7. How does the client verify the CA certificate? 8. The establishment process of SSL handshake in HTTPS 9. How does HTTPS prevent man-in-the-middle attacks? 10. Why does tcp shake hands three times and wave hands four times? 11. The realization of TCP reliable transmission principle (sliding window). 12. What's the difference between Tcp and Udp? 13. How to realize socket disconnection and reconnection, and how to realize the heartbeat mechanism? 14. The function and principle of Cookie and Session. 15. What happened when the browser entered the address to the feedback? .

Third, performance optimization

1. What APP stability optimizations have you made? 2. How to ensure business stability? 3. If something unusual happens, how to stop the loss quickly? 4. How is startup optimization done? 5. How is it asynchronous? did you encounter any problems with asynchrony? 6. Is there a good solution to the slow startup caused by version iteration? 7. What is the biggest feeling of memory optimization? 8. How to avoid memory jitter? (code precautions) 9. How to solve memory leaks 10 and what tools are used in the process of layout optimization? 11. Why does the layout lead to stutter? how do you optimize it? 12. How to get Catton information automatically? 13. The reason why TextView setText takes time, how to understand the source code of TextView drawing layer? 14. Talk about several points for mobile users to obtain network data. 15. What are the ways to improve the security of app? 16. How to do Android app reinforcement? 17. What is the confusion principle of Android? 18. Talk about your understanding of Android signatures. 19. How to optimize the implementation principle of custom View 20 and TraceView, and analyze the source of data error. .

IV. Third-party library

1. The underlying framework of the network: the implementation principle of OkHttp 2. What optimizations does OKhttp have for the network layer? 3. Network request cache processing, how does okhttp deal with network cache? 4. Load a 10m picture from the network, what do you need to know? 5. Network encapsulation framework: Retrofit implementation principle 6, responsive programming framework: RxJava implementation principle 7, picture loading framework: Glide implementation principle 8, Glide how to determine the completion of picture loading? 9. How to control the size of Glide memory cache? 10. Load the bitmap process (how to ensure that there is no memory overflow) 11. Application scenarios of soft references and weak references in Android. 12, the principle of LruCache 13, the comparison between Fresco and Glide: 14, how does Bitmap deal with a large picture, such as a large picture of 30m, how to prevent OOM? 15, event bus framework EventBus implementation principle 16, memory leak detection framework: LeakCanary implementation principle 17, how to determine whether an object is reclaimed in leakCannary? How do I trigger manual gc? C layer implementation? 18. Dependency injection framework: ButterKnife implementation principle 19, dependency global management framework: Dagger2 implementation principle 20, database framework: GreenDao implementation principle.

5. Related to Android Framework

1. Briefly introduce Android system architecture 2. Event distribution mechanism of View? How to resolve the sliding conflict? 3. How to solve the event conflict of View? Can you give me an example of what you encountered in development? 4. The drawing process of View? 5, LinearLayout onLayout method to achieve parsing (layoutVertical core source code) 6, Requestlayout,onlayout,onDraw,DrawChild differences and relations? 7. The relationship between process and thread in Android? The difference? 8. How to start multiple processes? Can the application start N processes? 9. The advantages and disadvantages of IPC mode and various ways in Android? Why do I need IPC? What are the possible problems with multi-process communication? 10. Talk about AIDL? How to optimize the use of AIDL for multiple modules? 11. Why choose Binder? What is the function and principle of Binder mechanism? 12. What is the role of ServiceManager in the Binder framework? 13. What is the startup process of Android system? 14. AMS family 15. App startup process (cold start process of Activity) 16. How does ActivityThread work? 17. Talk about the startup process of the four components and the way of starting and destroying the four components. 18. The principle of broadcast transmission and reception. 19. How does AMS manage Activity? In general, what happens when the next application is installed on the phone? 21. The packaging process of Android?

VI. Other high-frequency interview questions

1. The principle and difference of MVC MVP MVVM? 2. Can you talk about the evolution of MVC- > MVP- > MVVM? 3. Principle of thermal repair? Plug-in principle? 4. ARouter routing principle? 5. Gradle lifecycle 6. How to ensure that a backend service will not be killed? What is the way to save electricity? 7. The realization principle of Android animation framework. 8. How can a lower version of SDK implement a higher version of api? 9. What is your understanding of Context? 10, Android life cycle and startup mode 11, ListView and RecyclerView series 12, how to implement a push, message push principle? The problem of push arrival rate? 13. Do you know anything about Google's new Room architecture? 14. What's the difference between Debug and Release's APK? 15. For the allocation of process memory in Android, can you allocate the quota memory yourself? 16. What is the most essential difference between SurfaceView and View? 17. The adaptation of curved screen. 18. TextView calls the internal execution flow of the setText method. 19. How to control the View display (RemoteView) of another process? 20. How to understand the file descriptor?

P7 Android architect technical brain map; leak checking, systematic in-depth learning and improvement

After reading the above, have you mastered the method of example analysis from java language to AIDL usage principle? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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