Articles
android

Drawing the empty space-Explore the implementation principle of Jetpack Compose

In Flutter, Dart specifically optimizes how to efficiently recycle frequently created and destroyed objects, while Compose's implementation on the Android platform is essentially ordinary Kotlin/JVM code. How to design Compose to have reliable performance is an interesting question. Grouped on the tree In 2019, Leland Richardson briefly described the implementation principle and underlying data structure of Compose in the Understanding Compose speech at the Google Android Dev Summit , and publis

... Grace
schedule 28 min read
android

Springboot extended mobile phone SMS verification code login + vue front desk implementation

Today I will tell you how to expand and increase the login function of mobile phone SMS verification code in the springboot framework. SmsAuthenticationToken step: The principal originally represented the user name, but reserved here, it just represents the mobile phone number. Credentials is the original code and password, which is not needed for SMS login, so delete it directly. SmsCodeAuthenticationToken() Two construction methods, one is constructed without authentication, and the other is c

... Cole
schedule 9 min read
android

Jetpack Compose before and after use

In order to include the updated content of Jetpack Compose 1.0.0-beta05, this article was updated after the first release . If you want to see the original version , please click here . In 2020, I started the task of slowly migrating Tivi UI, with the goal of making it written by Jetpack Compose . After about 12 months, the task is complete! In this article, we will review and compare some key indicators to understand Compose's relative advantages, including: APK size, build speed, and number of

... Wesley
schedule 10 min read
android

Hongmeng kernel source code analysis (mutual exclusion lock) | Mutex is much plump than spin lock | Chinese annotation HarmonyOS source code | v27.01

Hongmeng kernel source code Chinese annotation >> Intensive reading of the kernel source code, Chinese annotation analysis, deep excavation of foundation engineering, permanent brain memory, four source code warehouses are updated daily <Gitee | Github | CSDN | Coding> Hongmeng Kernel Source Code Analysis Blog >> Storytelling kernel, Q&A guide, life-style metaphor, tabular description, graphical display, daily synchronization update of mainstream sites < OSCHINA | CSDN |

... Levi
schedule 15 min read
android

HTML knowledge points

What are the three layers of the browser page? What are they? What is the role? Composition: structure layer, presentation layer, behavior layer; They are: HTML, CSS, Javascript; Function: HTML implements the page structure, CSS implements the performance and style of the page, and Javascript implements the functions and services of the client. What does Doctype do? How to distinguish between strict mode and promiscuous mode? What do they mean? What is the role of Doctype? Declaration document t

... Londyn
schedule 18 min read
coder_life

Leetcode-Profit Plan

This is the 9th day I participated in the more text challenge. For details of the event, please see the more text challenge Title description In the group n Employees, they can complete a variety of jobs to create profits. First i Kind of work will produce profit[i] Profit, it requires group[i]Members participate together. If a member is involved in one of these tasks, they cannot participate in the other. Any work that produces at least minProfitThe subset of profit is called the profit plan. A

... Hailey
schedule 6 min read
coder_life

android interview topics(8)

1. Horizontal and vertical screen switching: Three values can be set in configchanges. When not set, the life cycle of horizontal and vertical cuts will go twice, and the vertical and horizontal cut will go once. Configchanges="orientation" The method of horizontal and vertical screens is walked once. Execute the onConfigChanged method Configchanges="oritation||keyboardhidden" once both horizontally and vertically. The onConfigChanged method is executed twice for horizontal cutting and vertical

... Adrian
schedule 38 min read
coder_life

Select component built by GrowingIO Design component library

Preface Select is one of the most frequently used UI components, and it can be used in many scenarios. In most cases, native HTML<Select>Tags cannot meet the functional requirements of the business, and the original HTML<Select>The styles of tags are different in each browser version. In this case, most people will choose to implement a Select component that meets the UI requirements and product functional requirements, or choose to use the Select component provided by some open sour

... Daniel
schedule 14 min read
coder_life

23 design patterns-prototype pattern (3)

Original author:  chenssy  Source:  www.cnblogs.com/chenssy/ The  copyright of this article belongs to the author and the blog garden, welcome to reprint, but this statement must be retained without the author s consent, and the original text link must be given in an obvious place on the article page, otherwise it will be retained The right to pursue legal responsibility. I ve heard this sentence before: "The highest level of programmers is Ctrl+C, Ctrl+V". Let s first ignore

... Isaiah
schedule 14 min read
coder_life

Article summary | Boss, have a nice weekend

Hello everyone, I am Lao Wu. Weekends are my time to bring my baby, so I won t post technical articles. Take advantage of your free time, summarize the articles for the bosses. Stop talking nonsense, roll up your sleeves and do it. Linux system programming Linux-C programming | 3 minutes to quickly understand signal-driven IO Linux-C programming/ process communication/ realize file server based on SysV message queue Linux-C programming / multithreading / a simple and reliable thread pool impleme

... Summer
schedule 5 min read
dev_tools

LINUX commonly used commands

How to add new system users in linux? Log in to the linux system as root and enter the terminal Add a new user, useradd username Set password, passwd username What is the linux kernel? Which modules are included? Computer hardware contains peripherals, processors, memory, hard disks and other electronic devices, but without software to operate and control, computers cannot work. The software that completes the control work is called the operating system, and is called the "kernel" in Linux termi

... Ella
schedule 30 min read
dev_tools

Is inline assembly terrible? After reading this article, end it!

In Linux code, it is often seen that some assembly codes are embedded in C code. These codes are either related to the hardware system or have a key impact on performance. A long time ago, I was particularly afraid of embedded assembly code, and it was only after the shortcomings of the assembly part were added that this mentality was completely ended. Perhaps you will hardly involve the work of embedded assembly code in your work, but once you get to the bottom of the system or need to optimize

... Elijah
schedule 18 min read
dev_tools

Shence Data Xu Meiling: Digital operation, a leap from 1 to 100

This article is based on the sharing and collation of "Digital Operation, Leap from 1 to 100" by Xu Meiling, the leader of the South China Business Center of Shence Data & Consulting Center. The main contents are as follows: The connotation of digital operation The construction of digital operation system The dilemma and reflection of digital operation The realization of the leap from 1 to 100 The reason for starting from 1 instead of 0 is because I believe that most companies already have A

... Eli
schedule 33 min read
dev_tools

R language Bayesian linear regression and multiple linear regression to construct a salary forecasting model

Original link: tecdat.cn/?p=21641  Original source: Tuoduan Data Tribe Official Account   Salary model In the field of labor economics, the study of income and wages provides insights into issues ranging from gender discrimination to higher education. In this article, we will analyze cross-sectional wage data in order to use Bayesian methods such as BIC and Bayesian models to build wage forecasting models in practice. Load package In this experiment, we will use the dplyr package to ex

... Natalie
schedule 20 min read
dev_tools

[1] Characteristics and methods of String

Spring source code /* * Copyright (c) 1994, 2013, Oracle and/or its affiliates. All rights reserved. * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. * * * * * * * * * * * * * * * * * * * * */ package java.lang; import java.io.ObjectStreamField; import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.util.ArrayList; import java.util.Arrays; import java.util.Comparator; import java.util.Formatter ; import java.util.Locale; import java.util.Obje

... Timothy
schedule 96 min read
programming

RichEditCtrl experience

1. Common problems  a. AfxInitRichEdit() that can be compiled but cannot be executed  ;  b. Upgrade the default Riched version (the default has some bugs), such as  adding LoadLibrary(" RICHED20.DLL ")  in InitInstance, and  finally pay attention to FreeLibrary if it is Available BOOL of the CRichEditView base class  CXXXXXXView::PreCreateWindow(CREATESTRUCT& cs)  {  //Load rich edit version 2.0  if (LoadLibraryA("RICHED20.DLL") == NULL)&nbsp

... Jameson
schedule 12 min read
programming

Related configuration of Nginx common modules

"This is the 19 days I have participated in the Wenwen Challenge. For details of the event, please see: Wenwen Challenge " Default configuration file user nginx; worker_processes 1; error_log /var/log/nginx/error.log warn; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; default_type application/octet-stream; log_format main'$remote_addr-$remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http

... Jack
schedule 17 min read
programming

Data structure interview eleven-sort 2 (merge, fast, heap sort)

Caption: "Interview Collection" has related exercises, but the thinking is relatively unclear, and the typesetting is wrong. The author has rewritten this by referring to related books and his own opinions for your reference. 10. Data structure interview eleven-sort 2 (merge, fast, heap sort) 5. Merge Sort [Algorithm idea]: Using the divide-and-conquer algorithm idea, the original array is divided into two sub-arrays A and B, and then the two sub-arrays A and B are continued to be divided into f

... Weston
schedule 7 min read
programming

python-pygame realizes aircraft wars-4-obtaining supplies, launching enhanced bullets, and zooming in to clear the screen

The effect of this step is to: 1. Added super bomb and enhanced bullet supply functions: as follows 2. After the user obtains the supply of super bombs and booster bullets, the bullets will be boosted first, and at the same time press the space bar to release the big move and clear the aircraft on the screen First prepare the resources, they can also be downloaded from the Internet. The resources of the tutorials I use directly here, why are they? In fact, through the first few steps, the basic

... Isaiah
schedule 19 min read
programming

Vue study notes (3) calculated attributes and listening attributes

1. Calculated properties (computed) (1) Calculation properties The original intention of the template design is to handle simple logic (declarative logic), adding too much logic to the template will make the template difficult to read and maintain <!DOCTYPE html > < html > < head > < title > Demo </ title > < script src = "https://unpkg.com/vue/dist/vue.js" > </ script > </ head > < body > < div id = "app" > < p > Original string:

... Liam
schedule 9 min read
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