The wave of layoffs in big factories continues, but I, who was born in both non undergraduate schools, turned against the wind and entered Alibaba

Preface

2021 Since the end , Ali 、 The news of layoffs and salary cuts in Internet leading enterprises such as Tencent has rushed to the hot search , Caused a lot of attention

 - 2021 year 9 month , Tencent starts layoffs in small business units ;
 -  Baidu （ Mainly involves MEG Mobile ecological business group ） Layoffs or pay cuts .
 -  millet （ All business lines except vehicle manufacturing business ） Layoffs or pay cuts .
 - 2021 year 12 month , Iqiyi is exposed to layoffs and the proportion is as high as 20% above ;
 -  Kwai Fu also sends out the news that the edge business line is optimized. .

Some people say that the golden age of the Internet is over , Others say that this is a return from the abnormal state to the normal state . But overall , Internet IT The salary of the industry has always been far ahead , Even if they are criticized because of too much work pressure and other problems , But it still attracts a batch of young groups to join .

More than 30 of us are in this position , move forward , or you 'll fall behind , Skill does not prompt 、 Failure to meet the requirements of the enterprise will naturally be eliminated . If you don't roll, others will roll you down ！！ Natural selection , That's the reality .

…

How to improve

Talent demand will not stop ahead , No matter now or in the future , The market will never be saturated . As a programmer , We must always remain fully sensitive to new technologies , Keep on learning , Improve your skills , Make yourself a real IT Elite talents .

Don't say anything superfluous , Next, I will share a review route for the interview , But if you don't know how to prepare for the interview efficiently , You can refer to my review route , You are welcome to communicate with each other if you have any questions , Come on! ！

Architects build the foundation of language

at present Android APP Developing a mainstream language is Java Language ,Java The biggest feature of language is to improve the possibility of software interaction , It can be said that almost all applications on Android phones use Java Language to write .

Knowledge points ：
1、 In depth understanding of Java Generic
2、 The notes are simple
3、 Concurrent programming
4、 Data transmission and serialization
5、Java Principle of virtual machine
6、 Efficient IO

The design idea interprets the open source framework

With the continuous development of Internet enterprises , There are more and more modules in product projects , User experience requirements are also higher and higher , Want to achieve a little step fast 、 The goal of fast iterations is getting harder , Plug in technology comes into being . Without plug-in technology , Meituan 、 Taobao integrates a lot of “app” Application , There may be a few g So big .

therefore , Today's Android Mobile development , It won't be hot repaired 、 pluggable 、 Componentization ,80% None of the above interviews passed .

Knowledge points ：
1、 Thermal repair design
2、 Plug in framework design
3、 Component frame design
4、 Image loading framework
5、 Network access framework design
6、RXJava Responsive programming framework design

360° All round performance tuning

In the hands of development engineers at different levels , Because of the uneven level of technology , Even though many mobile phones are running, the software performance is very high , There is still stuck when opening the application .

in addition , As the product content iterates , More and more complex functions ,UI Pages are also getting richer and richer , It also becomes an obstacle to smooth operation . in summary , Yes APP Performance optimization has become a comprehensive quality that developers should have , It is also the guarantee that developers can complete high-quality application works .

Knowledge points ：
1、 Design ideas and code quality optimization
2、 Program performance optimization
Start up speed and execution efficiency optimization
Layout detection and optimization
Memory optimization
Power consumption optimization
Network transmission and data storage optimization
APK Size optimization

3、 Development efficiency optimization
Distributed version control system Git
Build systems automatically Gradle

4、 Project practice
Starting speed
Fluency
Vibrato in APK The practice of packet size resource optimization
Youku responsive layout technology full analysis
network optimization
Mobile phone Taobao double 11 performance optimization project revealed
Gao de APP Full link source code dependency analysis
Get rid of OOM Experience sharing in actual combat
WeChat Android Terminal memory optimization practice

Android Framework architecture

Android Framework architecture （ senior UI+FrameWork Source code ） This knowledge is the most used today , We call it Android2013~2016 Technology of .

Android Developers also tend to be online Copy The code gets used to it, which leads to frequent “ Use ” The code is familiar and unfamiliar ： I am familiar with them almost every day , Copy the code every day ; Strange is that although I deal with these codes every day , But I haven't studied the principles of these codes , The deep meaning of the code .

Knowledge points ：
1、 senior UI promotion
2、Android Kernel components
3、 It's necessary for large projects IPC
4、 Data persistence and serialization
5、Framework Kernel parsing

NDK Module development （ Audio and video development series ）

NDK（Native Development Kit abbreviation ） A software development kit based on native program interface , Can let you in Android Use... In application C and C++ Code tools . Programs developed with this tool run directly locally , Not virtual machines .

stay Android in ,NDK It's a collection of tools , Mainly used to extend Android SDK.NDK Provides a series of tools to help developers develop quickly C or C++ Dynamic library , And can automatically put so and Java The applications are packaged together into apk.

Knowledge points ：
1、NDK Development of C/C++ introduction
2、JNI Module development
3、Linux Programming
4、 Bottom image processing
5、 Audio and video development
6、 machine learning

Flutter Learn advanced

2020 There is no doubt that the year of Flutter A year of technology in full swing . Now this technology is still very valuable .

Every mobile developer is working on Flutter It brings “ Rapid development of 、 Expressive and flexible UI、 Native performance ” We are crazy about our characteristics and ideas , From super App To stand alone applications , From pure Flutter To the mixing stack , Developers are exploring and applying in different scenarios Flutter technology , It's also facing a variety of different challenges .

Knowledge points ：
1、Flutter Overview of cross platform development
2、Windows in Flutter Development environment construction
3、 Write your first Flutter APP
4、Flutter Dart Introduction to language system
……

Wechat applet development

Wechat small program as one of the more popular programming development application scenarios now , It is favored by the market , This makes many developers greedy . But for beginners , It's completely out of my head , I don't know what knowledge we need to learn when developing and making wechat small programs , Friends in need can refer to this article .

The key points of this article are ：
1、 Small program overview and introduction
2、 Applet UI Development
3、API operation
4、 Shopping mall project actual combat

Android Related source code interpretation

“ Programming language is the way programmers express themselves , And architecture is the programmer's perception of the world ”. therefore , Programmers want to quickly recognize and learn Architecture , Reading the source code is essential . Read the source code , It's about solving problems + Understand things , More important, ： See the idea behind the source code ; The programmer said ： Read Wanxing source code , Practice in thousands of ways .

It mainly contains wechat MMKV Source code 、AsyncTask Source code 、Volley Source code 、Retrofit Source code 、OkHttp Source code and so on .

Android BAT Advanced development interview questions and answer analysis

Before the interview , Brush the topic, sprint

Within the week before the interview , You can start to brush questions and sprint . please remember , When I brush the questions , Technology first , Look at the basic algorithm , Such as sorting , And intelligence questions , Except for school recruitment , Otherwise, I don't usually ask .

About the interview questions , I have also prepared a set of systematic interview questions , Help you draw inferences from one instance ：
> This full version of the learning materials has been uploaded CSDN , Friends can comment if necessary 1 Or private letter [ Guarantee 100% Free access ].

Change your life , There is no shortcut , This road needs to be taken in person , Only in-depth thinking , Constantly reflect and summarize , Keep your passion for learning , Step by step to build their own complete knowledge system , Is the ultimate way to win , It's also the mission of programmers .