2022 Android interview essential knowledge points, a comprehensive summary

Preface

All the knowledge points of this article are summarized after personal experience of more than ten first and second tier Internet enterprises , Including the application Android Develop high-frequency knowledge points in all aspects of the post , Mainly for but not limited to Android Fresh interview . All the following knowledge points are sorted and published in Github/Gitbook, It is convenient for everyone to organize and study , Link at the end of the article .

author ：Ruheng
link ：https://www.jianshu.com/p/3df3d2974234

1 Java

1.1Java Basics

• Java Collections framework
• Java aggregate ——ArrayList
• Java aggregate ——LinkedList
• Java aggregate ——HashMap
• Java aggregate ——TreeMap
• Java aggregate ——LinkedHashMap
• Java Generic
• Java Reflection
• Java annotation
• Java IO
• RandomAccessFile
• Java NIO
• Java Unusual details
• Java The difference between abstract classes and interfaces
• Java Deep copy and light copy
• Java transient keyword
• Java finally And return Execution order
• Java 8 New characteristics

1.2Java Concurrent

• Java There are three ways to create a thread
• Java Thread pool
• Deadlock
• Synchronized/ReentrantLock
• producer / Consumer model
• volatile keyword
• CAS Atomic manipulation
• AbstractQueuedSynchronizer Detailed explanation
• In depth understanding of ReentrantLock
• Java Concurrent sets ——ArrayBlockingQueue
• Java Concurrent sets ——LinkedBlockingQueue
• Java Concurrent sets ——ConcurrentHashMap

1.3Java virtual machine

• Object creation 、 Memory layout and access location
• Java Memory area and memory model
• Java Class loading mechanism and class loader details
• JVM Garbage collection algorithm and garbage collector details
• JVM How to judge whether the object is dead ？

2 Android

2.1Android Basics

• Activity All round analysis
• Service All round analysis
• BroadcastReceiver All round analysis
• ContentProvider All round analysis
• Fragment Detailed explanation
• Android Message mechanism
• Android Event distribution mechanism
• AsyncTask Detailed explanation
• HandlerThread Detailed explanation
• IntentService Detailed explanation
• LruCache Principle analysis
• Window、Activity、DecorView as well as ViewRoot The relationship between
• View measurement 、 Layout and drawing principle
• Android Virtual machine and compiling process
• Android Interprocess communication mode
• Android Bitmap Compression strategy
• Android Animation summary
• Android Process priority
• Android Context Detailed explanation

2.2Android Advanced

• Android Multi thread breakpoint continuation
• Android Global exception handling
• Android MVP Model details
• Android Binder Mechanism and AIDL Use
• Android Parcelable and Serializable The difference between
• One APP From Startup to main page, it shows the process that has gone through ？
• Android Performance optimization summary
• Android Summary of memory leaks
• Android Layout optimization include、merge、ViewStub Use
• Android Authority handling
• Android Principle of thermal repair
• Android Getting started with plug-in
• VirtualApk analysis
• Android Push technology analysis
• Android Apk setup script
• PopupWindow and Dialog difference

2.3 Open source framework

• OkHttp analysis
• Retrofit analysis
• EventBus analysis

3 data structure

• The linear table
• Stacks and teams
• Trees

The foundation of the tree
Other common trees
Union checking set
B- Trees ,B+ Trees ,B* Trees

• chart

The foundation of the picture
A topological sort
Kruskal Algorithm
Prim Algorithm
Dijkstra Algorithm
Floyd Algorithm

• Hash lookup
• Sort
• Massive data processing

4 Algorithm

• The finger of the sword offer
• LeetCode

5 Design patterns

• Create pattern

Simple factory model
Factory method model
Abstract factory pattern
The singleton pattern
Builder pattern

• Structural mode

Adapter mode appearance mode
Decorator mode
The proxy pattern

• Behavioral patterns

Command mode
Iterator pattern
Observer mode
The strategy pattern
Template method pattern

6 computer network

• TCP/IP
• HTTP
• HTTPS

7 operating system

• summary
• Processes and threads
• memory management

8 database

• SQL sentence
  Github Address ：https://github.com/LRH1993/android_interview

summary

This is the end of it , Put a little benefit at the end of the article , The following is a story about Flutter Learning ideas and direction , Engaged in Internet development , The most important thing is to learn technology well , And learning technology is a slow and hard road , You can't rely on a moment of passion , It's not like you can learn it in a few days and nights , We must form the habit of studying hard at ordinary times , More effective learning needs to be achieved .

Because of the large amount of content, I only put a general outline , If you need to learn mind mapping in more detail, you can scan the QR code below for free .