Android - Birost

android

Open source guide for front-end projects

Open source guide for front-end projects This article explains how to build an engineered front-end library, combined with Github Actions , and automatically publish the entire detailed process to Github and NPM . Example We often see that popular open source projects like Vue and React have many configuration files. What are they used for? Their Commit and Release records are so standardized, are they based on some kind of agreement? Stop talking nonsense, take the picture first! The red icon a

android

Red-black tree realization

table of Contents 1. Red-black tree principle 1. The nature of red and black trees 2. Transformation rules (from the perspective of inserting nodes) 1. Discoloration 2. Left hand 3. Right-handed 3. Points to note when deleting nodes 2. Code 1. Define nodes and constructors 2. Define the red-black tree class and the method of declaring it 3. Left-handed 4. Right-handed 5. Insert operation 6. Correction operation 7. Delete operation 3. Reference link 1. Red-black tree principle In order to preven

android

[TSP] Solving traveling salesman problem based on matlab GUI ant colony algorithm [including Matlab source code 929]

1. Introduction 1 The origin and development of ant colony algorithm (ACA) . In the process of researching new algorithms, Marco Dorigo and others found that when ant colonies are looking for food, they exchange foraging information by secreting a biological hormone called pheromone. So that the target can be found quickly, so in his doctoral thesis in 1991, he first systematically proposed a new intelligent optimization algorithm based on ant population "Ant system (AS)". Later, the proponent a

android

The front end also needs to know something-data structure (on)

Data structure used so far Array The array can be divided into queues, stacks, etc. Hash table Used to store key-value pairs Queue Queue is a special array-** "First-in, first-out FIFO" array** FIFO: first in, first out topic Please implement a "restaurant call number" webpage Click the "Get Number" button to generate a number Click the "Call Number" button, and it will display "Please X number for dinner] analysis First of all, you should choose "queue" as the data structure Because "calling" s

android

React meets Typescript

React and Typescript are used in combination, and you always write by referring to the vscode prompt type every day, to record it, and continue to add it later. Define component props type Import React from 'REACT' ; // type type AppProps = { name : string ; children: React.ReactNode; status: 'success' | 'error' ; }; // interface interface AppProps { name : string ; children: React.ReactNode; status: 'success' | 'error' ; } const App = ( {name, children, status }: AppProps ) => ( < div &g

android

Several problems related to linked lists with loops

2021/04/22 Preface The following linked list is a linked list with loops, the entry of the loop is 2, and the length of the loop is 4. The linked list nodes are defined as follows: // Singly linked list node definition, refer to Leetcode class ListNode < T > { public T val; public ListNode<T> next; public ListNode () { this ( null , null ); } public ListNode (T val) { this (val, null ); } public ListNode (T val, ListNode next) { this .val = val; this .next = next; } } Copy code Dete

android

[webpack] Webpack package file analysis

[webpack] Webpack package file analysis Preface Understand how the code compiled and packaged by webpack runs in the browser.How webpack is modularized in the browser. What do different module loading methods look like after compilation.Analyze how different module loading methods run after compilation. For example, asynchronous loading Basic environment configuration Environment configuration # New Directory midir webpack the Analysis &-cd-webpack the Analysis # initialize npm the init # in

android

Secrets of the Android system (two)-Service startup process

Preamble Demystifying the Android system (1) -Activity startup process (on) Demystifying the Android system (1) -Activity startup process (on) Preface We know that Service has two ways to use it: startup and binding. This article explains them separately according to the two situations (the source code analysis is longer, comrades who don't talk about martial arts can directly pull it and see the summary at the end) Service start The service startup process is relatively simple, and there is no

android

Software Assurance and Testing Exercises

Black box testing 1. A certain information encryption code consists of three parts, the names and contents of these three parts are Encryption type code: blank or three digits; Prefix code: three digits that do not start with '0' or '1'; Suffix code: four digits. Assuming that the tested program can accept all information encryption codes that meet the above requirements, reject all information encryption codes that do not meet the requirements, try the equivalence class division method, analyze

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

android

TypeScript + Vue3 Quick Start [Top]

Hello, everyone, I am also learning TS recently. Before I learn Vue3, it is still necessary to understand some TypeScript related knowledge, let us learn together! 1. Get to know TypeScript Introduction to TypeScript TypeScript is an open source, cross-platform programming language developed by Microsoft. It is a superset of JavaScript and will eventually be compiled into JavaScript code. In October 2012, Microsoft released the first public version of TypeScript. On June 19, 2013, after a previe

android

Go implements various current limiting

Preface When developing a high-concurrency system, we may encounter excessive interface access frequency. In order to ensure the high availability and stability of the system, you need to restrict traffic at this time. You may use it. Nginx This kind of Web ServerTo control the request, it may also be implemented with some popular class libraries. Current limiting is a big killer of high concurrency systems. Before designing current limiting algorithms, let's first understand what they are. Limi

android

Detailed analysis of the mysql transaction log in the vernacular mysql

In the back-end interview, mysql is an indispensable part, and the inspection of transactions and logs is even more of the "hardest hit". Most students may know that mysql guarantees the transactional nature of SQL through redolog, binlog and undolog. It can be used for database data recovery, but a little deeper, how to ensure transactional? How is the data written to disk during update? What should I do if the contents of these two logs are inconsistent? To write the log, it is also necessary

android

Ali P8 boss will take you to learn Java lock in 3 minutes

This article is transferred from: Le byte article Main explanation: Java lock For more Java related knowledge, you can follow the public account "Le Byte" Send: 999 1 Introduction Large concurrent operations of the database should consider the performance issues of deadlocks and locks. I see that most of the language on the Internet is unclear (especially update locks), so here is a concise explanation, for the convenience of the following description, here T1 represents a database execution req

android

Realization of React+Koa file upload

background When I was writing my design recently, it involved some file upload functions, including ordinary file upload, large file upload, resumable upload, etc. Server-side dependency koa (node.js framework) koa-router (Koa routing) koa-body (Koa body parsing middleware, which can be used to parse post request content) koa-static-cache (Koa static resource middleware, used to process static resource requests) koa-bodyparser (parse the content of request.body) Cross-domain back-end configurati

android

The design and implementation of the front-end and back-end separation of the java ssm springboot + VUE epidemic prevention system system

 Main technologies: Java, springmvc, VUE, node.js, mybatis, mysql, tomcat, jquery, layui, bootstarp, JavaScript, html, css, jsp, log4j and other common basic technologies. The main design of the document: Summary **** 2 Design and Implementation of Information System Based on Java Epidemic Prevention Platform **** 3 1. Introduction **** 3 1.1 Research background 3 1.2 Project objectives: 4 2. Introduction and analysis of related technologies **** 4 2.1 spring 5 2.2 Spring MVC 6 2.3 mybatis

android

How do those advanced/senior front-ends answer JavaScript interview questions (3)

Preface ( Shh! Here are all algorithmic questions that have been interviewed! ) Algorithms are a topic that many factories like to produce, and everyone who has been corrected by the algorithm must be gnashing their teeth. Well, this article is a welfare article. The purpose is to let the friends find confidence, no longer resist the algorithm, no longer feel hurt by the algorithm problem The ultimate goal of this article is the last question, React Fiber. emmmm, just mention it, it's easy. Don'

android

3.11 [HarmonyOS Hongmeng Development] Component TimePicker

3.11 [HarmonyOS Hongmeng Development] Component TimePicker Author: Han Ru Company: Program Cafe (Beijing) Technology Co., Ltd. Hongmeng Bus Columnist TimePicker is mainly for users to choose the time. 1. Supported XML attributes The common XML attributes of TimePicker are inherited from: StackLayout TimePicker's own XML attributes are shown in the following table: Attribute nameChinese descriptionValueValue descriptionUse Casesam_pm_orderMorning and afternoon order0Indicates that the am/pm colum

android

GetX realizes similar WeChat forwarding and searching multiple friends

Customize searchBar to search the local database for friend information, highlight matching and send multiple selections Let's look at the file classification first receive_share_intent.dart please ignore Use MVC to achieve code layering logic: controller layer processing logic view: UI controls state: data layer widget: control split First look at the view layer class ForwardMsgPage extends StatelessWidget { final Message forwardMsg; /// Inject controller and state final ForwardMsgLogic logic

android

Completing the Android Skill Tree-Fun with Gradle (1) | Booklet Learn for Free

Basically, Android developers have indirect or direct contact with Gradle. After all, using AS to guide projects is this problem: stuck Gradle:Build Running Half an hour has passed, and you are still Building Running, and you can only fuck, what is this thing TM doing? ? ? After learning Gradle, it may help you understand the compilation process and make some optimizations for compilation speed~ Of course, the benefits are not limited to this. For example, you can learn about the specific APP pa

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