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Brought to you today is that some high-end Android technology companies need to use large, specially put together a document, the end of the article for everyone to share, we hope everyone can see.

These topics a little technical content, you need a good time to look at the point.

Interview questions

A. Picture

1, photo gallery contrast
2, LRUCache principle
3, image loading principle
4, to achieve their own gallery, how do?
5, Glide source parsing 6, Glide what caching?
7, Glide how to control the size of the memory cache?

II. Network and security mechanisms

1. Network framework source code analysis and comparison
2. The request to design their own network framework, how to do?
3. The network caching request, okhttp how to handle network buffer;
4. Load a picture from the 10M network, said Caution
5.TCP three-way handshake and four wave
The difference between the UDP and 6.TCP
7.TCP and UDP applications
8.HTTP agreement
The difference between 2.0 and 9.HTTP1.0
10.HTTP message structure
11.HTTP difference with HTTPS and how to implement security
12. How to verify the legitimacy of the certificate?
13.https where used in symmetric encryption, where the use of asymmetric encryption, whether there is knowledge of the encryption algorithm (such as RSA), etc.?
How to determine their own 14.client sent message is received server?
15. Talk about your understanding of the WebSocket
And the socket of the difference 16.WebSocket
17. Talk to your Android signatures understanding.
18. Please explain why Andrews to add signature mechanism?
19. Video encrypted transmission
How 20.App is sandboxed, why is that?
21. rights management system (underlying rights is how the grant)?

III. Database

1.sqlite upgraded with statements fields
2. The source code analysis and database comparison frame
3. 4. The database optimized database data migration issues

IV. Algorithm

1. What sort algorithm?
2. Which is the fastest sorting algorithm?
3. Handwritten a bubble sort
4. Fast sorting code handwritten
The quick sort of process, time complexity, spatial complexity
6. handwriting heap sort
7. The process of heap sort, time complexity and space complexity
8. Write what you know about the complexity of the sorting algorithm and space, stability
9. The root node and the destination node is given the binary tree, to find the path from the root node to the target node
Ali 10 to more than 20,000 employees which algorithm to sort by age should be chosen?
11.GC algorithm (advantages and disadvantages of various algorithms and scenarios)
12. Ant Colony Algorithm and Monte Carlo Algorithm
13. Inclusions substrings (the KMP algorithm) to write code to achieve
14 a disorder not repeat array, the output of N elements, such elements and the addition of N to M, the given time complexity, spatial complexity. Handwriting algorithm
15. The two-level URL trillion files A and B, how to obtain the difference between C A and B set (Tip: Bit Mapping -> hash grouping -> Multi-file read and write efficiency -> Disk Addressing and application level to find optimization address)
Find the nearest merchant function (Tip: coordinate Mirror + R Tree) under 16. POI how to test Baidu.
17. A set of two arrays will not be repeated, seeking common elements.
18. The two collections are not repeated in the array, the two sets are huge amounts of data, the memory does not fit, how to find a common element?
19. a file has one million integers, separated by a space, in the proceedings to determine whether the user input integer in this file. Say the best way 2
200. Bitmap share a memory and memory footprint calculations
21.2000 ten thousand integers, find out the fifth top ten figures? 22. uneven burning a rope, the end of the head burn total of one hour. There are several pieces of the same material as the rope, asking how the method of burning rope clocked one hour fifteen minutes of it?
23. Number of daffodils demand within 1000 and within 40 million the number of daffodils
24.5 coins, 2 n-3 trans how hard is divided into two stacks by 8 and the number of credits and transfer piles turned face up in the opposite direction of the coin 25. The same hour walk around, hour and minute hands coincides with several 26.N * N graph paper, there are a number of 27.x squares apples a day can only eat one, two, or three, and asked how many days you can eat?

V. plug-in, modular, component-based, hot fixes, incremental update, Gradle

1. understanding of hot fixes and plug-ins
2. Plug the principle of analysis
3. The modular realization (benefit reasons)
4. Hot Fix, plug-in technology
The understanding of the project component
6. Describe what happened after clearing the build button clicks Android Studio

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VI. Architecture and design patterns

1. Talk about your understanding of Android design patterns
2.MVC MVP MVVM principles and differences
3. Design Patterns you know what?
4. Project commonly used design pattern
5. handwritten producer / consumer model
6. write code observer pattern
7. The adapter mode, decorator patterns, similarities and differences between the appearance mode?
8. The use of open source framework, introduce a read source code, internal processing.
9. talk about the understanding of RxJava
10.Rxjava send events step
11.RxJava effect, the advantages and disadvantages of using the asynchronous operation to the usual ratio
12. EventBus talk effect, implementation, instead of the way EventBus
13. App from 0 to design a whole architecture, how to do it?
14. Do you think say a comparison of the current fire and applications design (such as: live APP, P2P banking, small video, etc.)
15. The talk of java state machine understanding
16.Fragment If you use Adapter How should decouple?
17.Binder mechanism and the underlying implementation
18. For application updates this is how to do? (Answer: gray, update, subregional update)?
19. Json implement a parser (speed is increased by n)
20. When you start a long statistical standard

VII. Performance Optimization

1. How performance analysis and optimization of Android applications?
2.ddms and traceView
3. How to analyze performance optimization systrace?
4. How to analyze a memory leak with IDE?
5.Java multi-threaded performance problems caused, how to solve?
6. Start page black and white screen to solve?
7. Start slow how to solve?
8. how to ensure that the application does not start Caton?
9.App start capturing abnormal collapse
10 Custom View Notes
11. Now download very slow, again analyze the reasons from the network protocol, and optimization (Note: 5 may relate to the network layer).
12.Https request slow solution (Tip: DNS, to carry data, direct access to IP)
13. how to maintain application stability
And a performance comparison 14.RecyclerView ListView
15.ListView optimization
16.RecycleView optimization
17.View rendering
How 18.Bitmap handle big picture, such as a big picture of 30M, how to prevent OOM
Four kinds 19.java references differences and usage scenarios 20. A strong reference is set to null, will not be recycled?

Eight .NDK, jni, Binder, AIDL, interprocess communication related

1. Please tell us about NDK
2. What is the NDK library?
3.jni used it?
4. How jni registered native function, there are several registration methods?
5.Java how to call c, c ++ language?
6.jni how to call java layer of code?
7. The process of communication between the way?
8.Binder mechanism
9. Brief IPC?
10. What is AIDL?
11.AIDL solve the problem?
How 12.AIDL use?
Inter-Process-Communication on how 13.Android when inter-process communication work?
14. The multi-process scenarios encountered what?
15.Android process category?
16. Application of the process and the life cycle?
17. The process of scheduling
18. talk about shared understanding of the process and thread-safe
19 to talk about the understanding of the development of multi-process and multi-process scenarios
20. What is the coroutine?

Nine on .framework layer, ROM custom, Ubuntu, Linux and the like

1.java characteristics of virtual machines
2. talk about the understanding of the jvm
3.JVM memory area, open piece of thread affect memory
4. What is the understanding of the Dalvik, ART virtual machine?
5.Art and contrast Dalvik
6. virtual machine principle, how to design their own virtual machine (memory management, class loading, parents delegate)
7. Talk to your parents understand delegation model
8.JVM memory model, the memory area
9. The class loading mechanism
10. The talk understanding ClassLoader (class loader) of
11. talk about the understanding of the dynamic loading (OSGI) of
12. The memory cycle and avoiding object reference
13. The memory recovery mechanism, GC recovery strategy, GC and GC principles timing objects
14. The garbage collection and call System.gc () difference
15.Ubuntu compile Android
16. What system boot process? (Tip: Zygote process -> SystemServer process -> system services -> Application Process)
17. What happens when Roughly speaking, a clear application installed on the phone
18. DESCRIPTION Activity start the entire process
19.App start the process, click on the desktop to start from 20. logical addresses and physical addresses, logical addresses Why?

At last

Interview: If you do not interview well-prepared, complete waste of time, it is not responsible for their own!

Space is limited, the answer became a sort documents, receive mode: thumbs + concern, private letter I

There byte beating over the years 2017-2020 Android interview Zhenti resolve (a total of 10.82 million download times for update)

There are five chapters, basic computer face questions, questions surface data structures and algorithms, Java interview questions, Android interview questions, interview questions other extensions, a total of five non-technical questions section 354.

Byte beating Android interview Zhenti resolve Contents are as follows:

The first chapter basic computer face questions 1
First, face questions network 1
Second, the operating system interview questions (⭐⭐⭐) 21
Third, interview questions database (⭐) 23
Data Structures and Algorithms Chapter 25 face questions
Data Structures and Algorithms 25
Chapter 33 Java interview questions
Java questions first base face 33
Section 81 interview questions Java Concurrency
The third interview questions Java Virtual Machine (⭐⭐⭐) 121
Chapter 140 Android interview questions
Android questions first base surface (⭐⭐⭐) 140
Senior II Android interview questions (⭐⭐⭐) 208
Other extensions face questions Chapter 346
One, Kotlin (⭐⭐) 346
Second, the anterior end (⭐⭐) 346
Third, script language (⭐⭐) 349
Chapter VI Non-technical questions 350
A high frequency title set (⭐⭐⭐) 350
Second, the high-frequency sub-title set (⭐⭐) 352

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