Android development interview real question advanced version (with answer analysis)

Android Development is not as popular as it was a few years ago , But in the age of artificial intelligence , Senior talents are always in short supply . The level of interview related articles of senior Android development engineers on the network is uneven , Or complicated , Or the quality is too poor . In view of this , I compiled an article Android Develop interview questions and answers , Mainly for senior engineers .

I am currently working in a large factory Android Senior engineer , I have been interviewed by many big factories , For many years Android Development experience , This article is also based on my own experience , Combined with the interview articles in recent years , I hope it can better help you understand and consolidate your knowledge points .

One 、Android True questions and answers

Android Components

• Activity relevant

Startup mode and usage scenarios ?
onNewIntent() and onConfigurationChanged()
onSaveInstanceState() and onRestoreInstanceState()
Activity How did it start

Startup mode and usage scenarios
Explain the scene in detail and some pits
onSaveInstanceState as well as onRestoreInstanceState Use Simple and transparent
onConfigurationChanged Use and problem solving A comprehensive description of the various situations
Activity Start process resolution

• Service relevant

Process keeping alive
Service Running thread of （ Life cycle methods are all in the main thread ）
Service How to start and how to stop
ServiceConnection Which thread does the callback method run in ？

startService and bingService difference The difference between them is explained completely
The process keeps the general routine alive I explained all the means to keep the process alive
Everything you need to know about process assurance 10 ten thousand + Article on process preservation

Fragment

Fragment Life cycle and Activity contrast
Fragment How to communicate with each other
Fragment Of startActivityForResult
Fragment Overlapping problems

Fragment On
Fragment overlap , How to communicate
Fragment Life cycle

Handler Related knowledge , The interview will be asked ！

What I often ask ：

Handler Looper Message What is the relationship ？
Messagequeue What is the data structure of ？ Why use this data structure ？
How to create Handler?
Handler post Methods the principle ？

Android The principle of message mechanism and source code analysis Complete analysis from the perspective of source code
Handler I don't understand , What can I do to jump ？
Android Handler Message mechanism （ To solve the puzzle ）
Android Message mechanism Guo Shen's article

Android Layout optimization

When to use ViewStub、include、merge？ What are their principles ？

ViewStub、include、merge Concept of analytical
Android Layout optimization ViewStub、include、merge Use and source analysis

BroadcastReceiver relevant

Registration method , priority
The radio type , difference
Use scenarios of broadcasting , principle

Android Broadcast dynamic static registration Easy to understand
Common use and process analysis
Broadcast source code analysis

AsyncTask relevant

AsyncTask Is it serial or parallel ？
AsyncTask As the Android version changes

AsyncTask Complete resolution Guo Shen's article An article is enough From use to source
Serial or parallel

Android Event distribution mechanism

onTouch and onTouchEvent difference , Call to order
dispatchTouchEvent, onTouchEvent, onInterceptTouchEvent Method sequence and usage scenarios
Slide conflict , How to solve

Event distribution mechanism Produced by Guo Shen
Event distribution resolution Produced by Hongyang
dispatchTouchEvent, onTouchEvent,
onInterceptTouchEvent Method usage scenario analysis

Android View Drawing process

sketch View Drawing process
onMeasure, onlayout, ondraw What should be paid attention to in the method
How to customize View
view Redraw mechanism

Android LayoutInflater Principle analysis , Take you step by step to learn more about View( One )
Android View state and redraw process analysis , Take you step by step to learn more about View( Two )
Android View state and redraw process analysis , Take you step by step to learn more about View( 3、 ... and )
Android Customize View Implementation method , Take you step by step to learn more about View( Four )
Don't ask me why I recommend so many Guo Shen's articles , Because I grew up watching Guo Shen's article ！

Android Window、Activity、DecorView as well as ViewRoot

Window、Activity、DecorView as well as ViewRoot The relationship between

Android At the heart of Binder Multi process AIDL

common IPC Mechanisms and usage scenarios
Why Android uses binder Cross process transfer
Problems caused by multi process

AIDL Use analysis
binder Principle analysis It's really good
binder The lowest level of parsing It's hard to understand. , I have read it several times, but I still know a general
Multi process communication and its problems
Comparison of multi process communication mode

Android Advanced essentials ：AMS,WMS,PMS

This part is really complicated ！
AMS,WMS,PMS The creation process

AMS,WMS,PMS Full resolution
AMS Start process
WindowManagerService Startup process analysis
PMS Start process resolution

Android ANR

Why does it happen ANR？
How to locate ANR？
How to avoid ANR？

What is? ANR
How to avoid and analyze
Android Performance optimization ANR Detailed explanation

Android Memory related

Be careful ： Memory leaks and overflows are 2 A concept

When will memory leak ？
How to prevent memory leaks ？

The difference between memory leak and overflow
OOM Concept and Android memory management mechanism
The possibility of memory leaks
How to prevent memory leaks

Android Screen adaptation

The definition of screen adaptation
Popular screen adaptation

Screen fit terms and concept analysis
Today's headline technology adaptation program

Android Caching mechanisms

LruCache Using the extreme principle

Android Caching mechanisms
LruCache On the principle of application

Android performance optimization

How to do Memory cpu Power consumption Positioning and optimization of
Performance optimization is often used
How to avoid UI Carton

I'm watching geek time Android Development master class , The performance optimization articles inside are good

Performance optimization full resolution , Tool use
Performance optimization best practices
Zhihu highly praises the article

Android MVC、MVP、MVVM

There are several that I should choose ？ Advantages and disadvantages

Ren Yugang's article ：
Design pattern selection

Android Gradle knowledge

These two official articles are good enough
You have to post official documents ： The build
Gradle Tips and tricks

Gradle plug-in unit Understanding is good.
Gradle Custom plug-in mode
Fully understand Gradle - Execution sequence

Gradle A series of
Gradle Series two
Gradle Series three

RxJava

Using process , characteristic , Principle analysis
RxJava Nouns and how to use them
Rxjava Analysis of the principle of observer pattern
Rxjava Subscription process , Thread switching , Source code analysis series

OKHTTP and Retrofit

OKHTTP Complete parsing -- Produced by Hongyang
Retrofit Usage flow , Detailed explanation of mechanism
from HTTP To Retrofit
Retrofit How it works

The most popular image loading Library ： Glide

Guo Shen series Glide analysis
Android Image loading framework is the most complete analysis （ One ）,Glide The basic usage of
Android Image loading framework is the most complete analysis （ Two ）, From the perspective of source code Glide The implementation process of
Android Image loading framework is the most complete analysis （ 3、 ... and ）, In depth exploration Glide Cache mechanism
Android Image loading framework is the most complete analysis （ Four ）, Get along well with Glide Call back and monitor
Android Image loading framework is the most complete analysis （ 5、 ... and ）,Glide Powerful image transformation function
Android Image loading framework is the most complete analysis （ 6、 ... and ）, To explore the Glide Custom module function of
Android Image loading framework is the most complete analysis （ 7、 ... and ）, Achieve with progress Glide Image loading function
Android Image loading framework is the most complete analysis （ 8、 ... and ）, Give you a comprehensive understanding of Glide 4 Usage of

Android Componentization and plug-in

When the business is large and there are many codes, we will use

Why use componentization ？
How components communicate with each other ？
How to jump between components ？

Android Plug in and hot repair knowledge carding
Why use componentization
1、Android The practice of complete componentization
2、Android Completely componentized demo Release
3、Android Completely componentized - Code and resource isolation
4、Android Completely componentized —UI Jump to upgrade
5、Android Completely componentized — How to use Arouter

Plug in framework history
In depth understanding of Android Plug in technology Alibaba plug-in technology
Android Plug in and hot repair knowledge carding

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Two 、 Common non-technical problems

In addition to the Android advanced technical problems sorted out above , There are also some questions that interviewers like to ask , Everyone is ready to answer ：

• What difficulties have you encountered in the project ？ How to solve ？
• Recently do APP How is it structured ？ Why do you want this architecture ？
• How to learn by yourself at ordinary times 、 Advanced technology ？
• What technical level do you think you are at ？
• What are your technical advantages ？

Second and more important Sometimes it's normal for an interviewer to ask you questions if you don't , It is impossible for us to understand all the problems , But we must have the necessary thinking process , The process and method of solving problems are the most important in the workplace , Not the result ！ This is also what the interviewer likes to investigate most .

So much for the time being , The main Android technology issues They are quite perfect , Algorithm and java I will keep updating the basic questions .

notes ： author ： Yuege investment notes , Link to the original text (https://juejin.cn/post/6844903797270003719)

Last

At the end of the article, I put a small welfare for you , Scan the qr code below ：

There are many technical bulls in the group , Any questions , Welcome netizens to communicate with us , The group has not regularly shared high-level free of charge Android Learn video materials and interview kits ~

Say something in secret ： Experts in the group are like clouds , Welcome to join the group and discuss with the big guys ！