Today, I invite a mobile terminal senior engineer with 4 years of work experience in a major factory . At the node of the eventful autumn of 2020, I will talk to you about my feelings about job-hopping, share my interview, and review materials.

Since I did more business in Didi before, this time I was looking for a detailed technical direction, so I felt a little "changing career". Let me talk about some thoughts about the job search this time.

Regardless of whether you are doing business or drilling technology, one thing is the same, that is, you must look at the problem from the perspective of the person in charge of the direction . For example, what are the current technical/business pain points in the direction, what is the technical/business plan for the next six months or one year, what problems can be solved, and what excellent technologies are currently available in the industry that can be referred to and applied to the current direction. In fact, this is for us to get used to looking at problems from a higher angle, instead of doing what others arrange for us to do.
Don't neglect every effort you usually make, such as brushing a few leetcodes, learning a set of open courses from foreign universities, and writing a technical article . These efforts may not have immediate effects, but they will certainly play a role in future development. The source code that I learned in my spare time 2 years ago was used in this interview. A course that Steve Jobs audited in college was applied to the design of Apple computers 10 years later. Those who have time can watch this speech by Jobs at Stanford
No matter whether you need to change jobs or not, you can go out for interviews every year . One is to see how well oneself is and what the price is in the market; the second is to be familiar with interview questions and expand your own interview question bank; the third is to see what weaknesses are in your knowledge network at that time, and you can check for any weaknesses.
For business students, it is best to dig out a few points that can be written on your resume or are worth mentioning to interviewers as project technical problems . This also goes back to the first point, to have the ability to think actively. And a more realistic problem is: even if the business we do is important, it is difficult to easily impress the interviewer if we can't tell the technical difficulties.
Drop the bag for safety . After verbal offer or hr talk about salary, don't relax, you feel that your job search is over. Because whoever takes as a spare tire, this is impossible to say.
Mentality . Don't get discouraged if you fail to interview several times. You can comfort yourself, not because you can’t, but not suitable. Of course, after looking for a job, you must wake up, maybe you really can’t do it, usually you have to work harder :)

Unremarkable

Regarding programmers, in addition to doing projects to improve their own skills, there is also a way to improve their professional skills: more! Look! book!

I studied the following review materials repeatedly before the interview, and guess what, I encountered the original question! So, this information is still very helpful to me. Today, in order to give back to all the fans, I will also share my review information, hoping to help everyone.

Because there are too many details in the document, only the screenshots of some knowledge points have been edited. Under a rough introduction, each small node has more detailed content! Due to the length of the headline, the detailed explanation on the catalog cannot be listed one by one.

You need to get all the detailed knowledge explanation of the following PDF, you can privately write to me [core notes] to receive

Summary of Java knowledge points

JVM
Object
static
final
String、StringBuffer、StringBuilder
Exception handling
Inner class
Polymorphism
Abstraction and interface
Collection frame
reflection
Singleton
Thread
volatile
synchronized
lock
Reference type
Dynamic proxy
Meta annotation

Summary of Android knowledge points

Activity
Fragment
Service
BroadcastReceiver
ContentProvider
data storage
View
process
Parcelable interface
IPC
Window / WindowManager
Bitmap
Screen adaptation
Context
SharedPreferences
Message mechanism
Thread asynchronous
RecyclerView optimization
Webview

Summary of Android extension knowledge points

ART
Apk package body optimization
Hook
Proguard
Architecture
Jetpack
NDK development
Class loader

Summary of performance optimization knowledge points

Start optimization
UI rendering optimization
Crash optimization
Memory optimization
Caton optimization
Storage optimization
Network Optimization
Power consumption optimization
Multi-threaded concurrent optimization
Installation package optimization

Android open source library source code analysis

OkHttp
Retrofit
Glide
GreenDao
RxJava
LeakCanary
ButterKnife
Dagger2
EventBus

Summary of Kotlin knowledge points

Object
class
inherit
variable
constant
Static constant
Definition method
Overload method
Basic data type
Comparison type
Conversion
String comparison
Array
cycle
Corner mark cycle
Advanced loop
Judge
Constructor
Class creation
Privatization set method
Privatization get method
enumerate
interface
Anonymous inner class
Inner class
Internal class access to external class variable with the same name
Abstract class
Static variables and methods
variable parameter
Generic
Structure code block
Static code block
Method code block
Visible modifier
No need to findViewById
Lambda
Function variable
Empty safety
Method supports adding default parameters
Class method extension
Operator overloading
Extension function
Coroutine

Summary of design patterns

Design pattern classification
Six principles of object-oriented
Factory mode
Singleton mode
Builder mode
Prototype mode
Adapter mode
Observer mode
Agency model
Chain of Responsibility Model
Strategy mode
Memo mode

Gradle knowledge points summary

Computer network foundation

The layered structure of the network system
HTTP related
TCP/IP
Socket

Summary of common interview algorithm questions

Sort
Binary tree
Linked list
Stack/queue
Two points
Hash table
Heap/Priority Queue
Binary search tree
Array / double pointer
greedy
String processing
Dynamic programming
matrix
Binary/bit operation
other

Due to space problems did not impress all the details that are needed can be private letter [notes] core collection

In addition, there are some information to share with you, which is a summary of knowledge collected, sorted and classified by yourself, data structures, algorithms, performance optimization, design patterns, etc., basically all on the Internet. Please also respect the knowledge output.

The materials to share with you include Android learning PDF + architecture video + interview document + source code notes , advanced architecture technology advanced mind map, Android development interview special materials, advanced advanced architecture materials

The content includes but is not limited to [ Advanced UI, performance optimization, mobile architect, NDK, hybrid development (ReactNative+Weex) WeChat applet, Flutter and other all aspects of Android advanced practical technology ] I hope to help everyone learn to improve the advanced level, It also saves everyone's time to search for information on the Internet to learn, and it can also be shared with friends around to learn together!

These are fine materials that I will read again and again in my spare time. Can effectively help everyone master knowledge and understand principles. Of course, you can also use it to check for omissions and improve your competitiveness.

If you have a need, you can point it to receive