Dry goods are coming! Probably the most detailed Android-resource loading mechanism analysis in the entire network, Android post

It’s not that Android is not working, it’s that you can’t keep up

Many of my readers have reported that the number of resumes that can be received for a position now is several times that of previous years. We must admit that the status quo of the Android industry is the fact that there are too many monks and porridge , not to mention junior and intermediate engineers, even senior engineers are also a lot. Companies are looking to recruit more and more people. If you don't order "real things", it's really difficult .

A few days ago, I chatted with an Android predecessor. He said that many engineers in the interview were stuck on "used" or "heard of" for special basic questions. Without going deep into the technical details, they can only be eliminated in a highly competitive market.

The following are some of the questions he mentioned. Can you answer them quickly?

• SoftReference (soft reference) will be recycled by the virtual machine when the memory is insufficient, will it cause OOM?
• How is the CANCEL event generated in the Android Touch event? Under which scenarios will CANCEL events occur?
• The Looper in the Handler has an infinite loop, why is it not blocking the UI main thread?
• You write " proficient in multi-threading " in your resume , then: What does the "working memory" in a thread refer to? Why is it not allowed to use Executors to create a thread pool in the Ali development specifications?

You must want to say "make rockets for interviews, screw the screws at work" . In fact, your answer reflects your deep understanding of technology and your ability to solve problems.

It sounds like a routine, but what companies need is " senior/senior Android development " who can be responsible for submitting code and using every tool .

The following are some advanced technical outlines about Kotlin, I hope it will be helpful to friends.

One, data type

1. Boolean data type
2. Number data type
3. Unboxing and Char data type
4. Basic data type conversion and string
5. Classes and objects
6. Null type and smart type conversion
7. Package
8. Range (Range)
9. Array

Second, the program structure

1. Constants and variables (val, var)
2. Function
3. Lambda expression
4. Class members (member methods, member variables)
5. Basic operator
6. Expressions (infix expressions, branch expressions, when expressions, etc.)
7. Loop statement (for loop, while loop, continue, break)
8. Exception catch (try, catch, finally)
9. Named parameters, variable length parameters, default parameters

Three, object-oriented

1. Object-oriented-abstract class and interface (abstract, interface)
2. Child inherits father's business-inheritance
3. Visibility of the class and its members (private, protected, internal, public)
4. object
5. Companion objects and static members
6. Method overloading and default parameters
7. Extended member
8. Property Agent
9. Data class (allOpen, noArg plugin, goodbye, javaBean)
10. Inner class (this@Outter, this@Inner)
11. Enumeration (enum)
12. Sealed Class

Fourth, higher-order functions

1. Basic concepts of higher-order functions
2. Common higher-order functions (forEach,map,flatmap,fold,reduce,filter,takeWhile,let,apply,with,use)
3. Tail recursion optimization (tailrec)
4. Closures (the gospel of functional programming)
5. Function compound (f(g(x)),infix)
6. Currying-function call chain
7. Partial function

Five, Lambdas programming

1. Introduction to lambdas
2. lambdas and collections
3. lambda expression
4. Access variables in scope
5. Member reference
6. Filter and map of collection of functional API
7. all、any、count和find
8. groupBy
9. flatMap和flatten
10. sequence
11. Use Java functional interface
12. Pass the lambda as a parameter to the Java method
13. Explicitly convert lambda to functional interface
14. The with function of lambda with receiver
15. Apply function of lambda with receiver

Six, domain specific language DSL

1. Basic concepts of DSL
2. Gradle Kotlin scripting

Seven, coroutine

1. The basic concept of coroutine
2. Analysis of the principle of coroutine
3. Kotlinx.coroutine framework introduction

Eight, reflection syntax and libraries

1. Using Java reflection in Kotlin
2. Kotlin reflection in Kotlin

Nine, generic, variant, star projection

1. Basic syntax of generics
2. Generic implementation mechanism
3. Change
4. Star projection

10. Kotlin and Android

1. Anko configuration and use

• anko-commons
• anko-layout
• anko-coroutines library
• anko-sqlite foot

2. Kotter Knife

3. RxKotlin and RxAndroid configuration

4. Kotlin Retrofit

5. Kotlin Android Extensions

• Plug-in principle
• Plug-in use

Digression

No matter what kind of interview, no matter what kind of interview, if you want to avoid being abused by the interviewer, you have to max out the interview questions and make a comprehensive preparation. Of course, in addition to this, you also need to lay a solid foundation in peacetime. In this way, no matter how the interviewer digs into his own knowledge, you can still cope with it~

Here I have prepared for you a set of advanced learning videos and interview topic information packages that I have collected and summarized since I have worked and participated in interviews of various sizes . Click here to share with you for free. If the environment is not good, the interview can go smoother, I hope it can help everyone~

Finally, if Ma Huateng gave you Tencent for one day, what would you do? Welcome to discuss in the comment section.

EF%BC%81.md) To everyone, I mainly hope that everyone can have a smoother interview in today's bad environment. I hope it can help everyone~

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Finally, if Ma Huateng gave you Tencent for one day, what would you do? Welcome to discuss in the comment section.