Articles
android

Flutter framework analysis (four)-RenderObject

1 Introduction In Flutter , the main responsibility of RenderObject is layout and drawing. Through the Element Tree introduced in the previous article , Flutter Framework will generate a RenderObject Tree . Its main functions are as follows: Layout, starting from RenderBox , lay out the RenderObject Tree from top to bottom. Drawing, through the Canvas object, RenderObject can draw itself and its child nodes in the RenderObject Tree . Click test, RenderObject passes the click event from top to bo

... Jayden
schedule 12 min read
android

Linux system programming [1]-writing more commands

Background introduction The author's knowledge background I have been in contact with Linux for almost a year. Theoretical knowledge: I learned the basics of operating systems, and understood the basic concepts of process scheduling, memory allocation, file management, and disk I/O. Practical operation: will use Linux simple commands to complete the Linux kernel compilation and programming in the embedded system design course experiment, and complete the HTTPS principle practical operation based

... Andrea
schedule 13 min read
android

Hongmeng kernel source code analysis (assembly summary) | All the assembly code of the kernel at a glance | Hundred blog analysis of HarmonyOS source code | v40.03

Millions of Chinese character annotations >> Intensive reading of the kernel source code, Chinese annotation analysis, deep excavation of foundation engineering, permanent brain memory, four major code warehouses are updated daily < gitee | github | csdn | coding > Hundreds of blog analysis >> Storytelling core, Q&A guide, life-style metaphor, tabular description, graphical display, mainstream sites are regularly updated < oschina | csdn | Nuggets | weharmony > The co

... Daniel
schedule 12 min read
android

For this ByteDance Android interview opportunity, I prepared for 158 days, and an oversight made my previous efforts to be abandoned!

Resume internal push Interview is the way of inferring, because the pass rate of interpolated resume is much higher than other methods; my way of inferring is: contacting a university senior who works in Bytedance. For online interviews, there is an online text editor, similar to Leetcode, which can be programmed online. However, I was a little nervous. Before the interview, I was not prepared to make sure that my internet environment was good (the laptop was out of power and I didn't notice it)

... Wesley
schedule 18 min read
android

Linux ALSA sound card driver 7: Codec in ASoC architecture

1. Introduction to Codec In mobile devices, the role of Codec can be summarized into 4 types, namely: Perform D/A conversion on PCM and other signals, and convert digital audio signals into analog signals Perform A/D conversion on analog signals of Mic, Linein or other input sources, and convert the analog sound signals into digital signals that the CPU can process Control the audio channel, such as playing music, listening to FM radio, or answering the phone, the audio signal circulation route

... Jameson
schedule 23 min read
coder_life

How to prepare for Ali's social recruitment

introduction   In fact, I really didn't plan to write this article. The main reason is that LZ's memory is not very good. Unlike some people with strong memory, after the interview, I can almost write down the conversation between myself and the interviewer. After LZ himself had finished the interview, apart from remembering some of the knowledge points discussed, the specific content was basically forgotten, so writing this article is actually very difficult.   However, there are too

... George
schedule 40 min read
coder_life

The most comprehensive network: all kinds of resource websites are organized for you! All you want is here

Before, many friends asked me if there are any useful and efficient online tools to share in my daily work, study, development, blogging, and video making. It just so happens that this time I will take this opportunity to share a wave. Not surprisingly, it is another sharing for the family. Remember to like/read it, don t just stare at it. Friends are also welcome to share and Amway s tools that you find useful, remember to share good things. The article is organized from: WeChat public account

... George
schedule 9 min read
coder_life

[C++grammar] Basic usage of file I/O stream

table of Contents 1. Introduction to input and output 1. C/C++ file operation comparison 2. What is a stream? 3. C++ I/O stream class hierarchy 4. Buffered input and output 5.gcc compiler cin.in_avail() 2. Write data to the file 1. Writing a small exercise 2. How to output information to file and screen at the same time? 3. Read data from file 1. Check whether the file is successfully opened 2. Check whether the end of the file has been reached 3. Read the file small exercise 4. Can the bad() f

... Camden
schedule 11 min read
coder_life

How to play Hongmeng Softbus's cross-device access-small summary

table of Contents: 1. Start FA across devices, migrate across devices, and migrate back 2. Connect Service across devices 3. More articles Key code: 1. Start FA across devices, migrate across devices, and migrate back (1) Permission ohos.permission.DISTRIBUTED_DEVICE_STATE_CHANGE: Used to allow monitoring of device status changes in the distributed networking. ohos.permission.GET_DISTRIBUTED_DEVICE_INFO: used to allow access to the device list and device information in the distributed networking

... Kaden
schedule 12 min read
coder_life

[Path planning] Grid map path planning based on ant colony algorithm matlab

Path planning is the key technology to realize the autonomous navigation of mobile robots. It refers to finding a collision-free path from the starting point to the target point in accordance with certain evaluation criteria (such as distance, time, energy consumption, etc.) in an environment with obstacles. Path, here select the evaluation standard of the shortest distance path planning, namely the shortest path planning problem. 1. Establishment of Mathematical Model of Path Planning Abstractl

... Riley
schedule 74 min read
dev_tools

Architect s Growth Path: In-depth interpretation of Kafka connector error handling and dead letter queue

The Kafka connector is a part of Kafka and is a powerful framework for building streaming pipelines between Kafka and other technologies. It can be used to stream data from multiple places (including databases, message queues, and text files) to Kafka, and stream data from Kafka to the target end (such as document storage, NoSQL, database, object storage, etc.) . The real world is not perfect and errors are inevitable, so it is best that Kafka's pipeline can handle it as gracefully as possible w

... Carter
schedule 19 min read
dev_tools

Vue quick start study notes (5)

Eighteen, vue-router routing 1. What is vue-router Vue RouterIt is the official route manager of Vue.js (path jump). It is deeply integrated with the core of Vue.js, allowingBuild a single page applicationIt becomes easy. The functions included are: Nested routing/view table Modular, component-based routing configuration Routing parameters, queries, wildcards View transition effect based on Vue.js transition system Fine-grained navigation control Link with automatically activated CSS class HTML5

... Greyson
schedule 8 min read
dev_tools

JVM Middle Chapter: Bytecode and Class Loading Chapter 04-Talk about class loader again

Note source: Full set of JVM tutorials in Silicon Valley, millions of broadcasts, the peak of the whole network (Song Hongkang explains the java virtual machine in detail) Synchronous update: gitee.com/vectorx/NOT... codechina.csdn.net/qq_35925558... github.com/uxiahnan/NO... @[toc] 1 Overview The class loader is the prerequisite for the JVM to execute the class loading mechanism. The role of ClassLoader: ClassLoader is the core component of Java. All Classes are loaded by ClassLoader. ClassLoa

... Melody
schedule 36 min read
dev_tools

How to set up a gRPC server in Dart

In this tutorial, we will introduce the basics of gRPC, which is a high-performance, open source, and general-purpose RPC framework, review the Dart programming language, and demonstrate how to build a gRPC server in Dart. We will guide you through the following. What is gRPC? How the protocol buffer works Set up a gRPC server in Dart Write service definition Compile proto Create a gRPC server Build a gRPC client Test server What is gRPC? gRPC is an inter-process communication (RPC) framework, e

... Jayla
schedule 17 min read
dev_tools

Java Core Foundation Part 2-Java Basic Grammar

Java basic syntax In this chapter, we will discuss the basic syntax of Java. Mainly from the following aspects: Java keywords Java identifier Java variables Java data types Java operators After learning the content of this chapter, we will have a deeper understanding of Java, and we can also use Java to complete basic operations. 1. Keywords 1.1 Meaning It is given a special meaning by java and is used as a string for special purposes. E.g: public: Means public class: Definition class 1.2 Featur

... Ashton
schedule 13 min read
programming

Java String

Java String 1 2 3 intern 1 2 3 1 2 3 4 5 6 7 1. 2. StringBuffer StringBuilder 1 append 2 3 Java String \ \ \ . , \ C \ char *p = " hello"; \ p p \ Java String \ \ String String str1 = "hello"; new String() String str2 = new String("hello"); ch new String ( ch ) char chs[] = {'h','e','l','l','l','o'}; String str3 = new String(chs); \ \ Sting constant pool \ 1. JDK.7 2. \ public static void main(String[] args) { String str1 = "hello"; String str2 = new String("hello"); System.out.println(str1 ==

... Ashton
schedule 9 min read
programming

Efficiency weapon: SpringBoot integrates Mybatis-Plus

1. What is Mybatis-Plus Official website address: baomidou.com/ Plus-MyBatis (the Opens new new window) (abbreviated MP) is a MyBatis enhancement tools, enhanced not only change on the basis of MyBatis, to simplify development, increase efficiency and health. characteristic No intrusion : only make enhancements without making changes, the introduction of it will not affect the existing project, it is as smooth as silk Low loss : basic CURD will be automatically injected at startup, performance i

... Dominic
schedule 11 min read
programming

Flutter Getx 01-routing, middleware, authentication, value transfer, jump

Getx pub.flutter-io.cn/packages/ge... vscode plugin Android Studio/Intellij plugin Objectives of this section GetPage object Routing level control Routing middleware, authentication 404 processing Route jump, replace, clear Route transfer value, return value Route transition animation Development environment Flutter 2.1.0-12.1.pre Dart 2.13.0 get: ^3.26.0 reference getx example getx_pattern GetX Snippets video www.bilibili.com/video/BV1yU... Code github.com/ducafecat/g... text Initial getx proj

... Lincoln
schedule 6 min read
programming

React (two) component communication

Component communication: (react version is 15 version, there may be some differences in operation with 16 version) Parent-child components: Father => son Use props: Mark by ref 1. Use props <!DOCTYPE html > < html lang = "en" > < head > < meta charset = "UTF-8" > < meta name = "viewport" content = "width=device-width, initial-scale=1.0" > < meta http-equiv = "X-UA-Compatible" content = "ie=edge" > < title > Life </ title > < script src = "../

... Mackenzie
schedule 10 min read
programming

How to use cloud native technology to build modern applications

Introduction: At the 2021 R&D Efficiency Summit, Yu Qi, chief architect of Alibaba Cloud Middleware, shared on the topic of "How to Use Cloud Native Technology to Build Modern Applications", how to use cloud features and cloud native technologies and products to help enterprises Traditional applications are transformed into modern applications. Author | Yuqi Today, cloud and cloud computing technology have been widely accepted by enterprises. There are many topics about cloud, cloud computin

... Serenity
schedule 18 min read
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