Shulou(Shulou.com)06/02 Report--

This article is to share with you what are the key points of Android interview. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Text

The whole interview question is divided into three parts: Java, Android and project experience.

Java technology

Java Foundation

Understanding of abstraction, inheritance, and polymorphism

The function and usage scenario of generics

The characteristics and usage scenarios of enumerations

The difference between thread sleep and wait

JAVA reflection mechanism

Differences between weak/soft/strong references

The difference and function between hashCode () and equals () of Object

Collection class

Functions, differences, and performance of common collection classes in JAVA

Concurrency-related collection classes

The internal implementation of some commonly used collection classes

Multithreaded correlation

Thread, Runnable, Callable, Futrue class relations and differences

Which thread pools are provided by default in JDK and what's the difference

There are several ways to synchronize threads, which are used in the project.

On the premise of understanding the default thread pool, implement the thread pool by yourself

4. Character

The immutability of String

The difference between StringBuilder and StringBuffer

Understanding of character sets: Unicode, UTF-8, GB2312, etc.

Problems related to regular expressions

Notes

Use of annotations

The level and significance of annotations

How to customize annotations

Android technology

1. Android Foundation

The meaning and use of the four components, life cycle callback and significance

The use of AsyncTask and Handler

Hierarchical framework of Android system

The implementation of AsyncTask

What should you pay attention to when using AsyncTask

Common storage methods of Android

The relationship between Looper, Handler and MessageQueue

Start-up process of Activity (investigate familiarity with Framwork)

Considerations for multi-process development (Application class distinguishes processes, inter-process memory is invisible, inter-process communication)

2. Resource related

The meaning of the picture

The function and usage of style and theme

The difference and conversion relationship among dpi, sp and px

What is the role of raw and assets folders, and what is the difference between them

How to find the most suitable resource under multiple resource folders in Android system

3. Virtual machine

Java memory model

Characteristics of Android virtual machine

The difference between Dalvik and Art

Familiar with the implementation mechanism of garbage collection, understand the GC type of virtual machine

View correlation

Use of common components: use of ListView, RecyclerView and Adapter

Inheritance relationship between View

The difference between Invalidate and postInvalidate

Customize the implementation of View (ask the relevant components based on the project experience).

The role of onMeasure/onLayout/onDraw

The function of methods for drawing related classes such as Paint, Matrix, Shader, etc.

Describe the event distribution mechanism in detail

Animation

What are the ways to realize animation in Android?

The meaning of Interpolator class and the commonly used Interpolator

What's the difference between ViewAnimation and attribute animation?

How to customize ViewAnimation

The realization principle of attribute Animation

Picture processing

How to load large images in general projects

The way the picture is compressed

How to load a high-definition picture without compressing a picture

In the process of loading pictures, the cache is usually used. What is the main function of this cache?

Talk about the picture loading framework that you are familiar with

Project experience

1. Development tools

Code management tools: SVN, Git

Common debugging tools: Hierarchy Viewer, DDMS, etc.

CI tools: Lint check, FindBugs, Jenkins

Memory analysis tools: dumpsys, memoinfo, MAT

2. Project engineering

APP update strategy: push or pull?

How to handle error crashes in a unified way

How to collect user behavior

What are the key points of log management? (Debug package is open, release package is closed, error log feedback)

Packing methods: Ant, Maven, Gradle

Model adaptation

Open Platform

Have you ever used a third-party platform

Familiarity with common open platforms (Wechat, QQ, Weibo, Alipay, etc.)

Has there been a unified encapsulation of third-party platforms?

Have you ever developed SDK yourself?

Design related

What are the commonly used design patterns and design principles

Application of Design pattern in Android Source Code

Application of Design pattern in Project

Subcontracting methods in the project

Application of MVC in android, advantages and disadvantages

Common hierarchies in android projects, package partitioning

Have you ever designed the hierarchical structure and package division in the project?

Thank you for reading! This is the end of this article on "what are the key points of Android interview?". I hope the above content can be helpful to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.