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/** * Role superclass: * Follow the design principles, find out the parts that may need to change in the application, and separate them, * Don't mix with code that doesn't need to change. * We found that the display, attack, defend and run of each character could change, so we had to write this independently. * Then accordi ...

Avfunction learning notes - audio and video editing Reading and writing of media data AVAssetReader AVAssetReader is used to read media samples from an AVAsset instance. One or more instances of AVAssetReaderOutput are usually configured and access audio samples and video frames through the copyNextSampleBuffer method. It ...

GridView and Spinner (follow up update of renderings) Use GridView to display the grid. In the grid, there are pictures with text. In addition, a Spinner can control the number of GridView columns. Case: the interface consists of a group of rows and columns with pictures and text. The Spinner controls the number of columns dis ...

Article reference Summary of ES6 in React.js Case description import React from "react" import { NavBar, Button, Icon } from "antd-mobile" class Photegraph extends BaseComponent { // video and mediaStreamTrack are properties of the photographic class video; mediaStreamTrack; // Constructor constructor (props) { ...

This question can refer to: 647. Palindrome substring In essence, it is the same. Judge all palindrome strings and find the longest one. Central expansion method Center extension is to take each letter of a given string as the center and extend it to both sides to find the longest subpalindrome string. Algorithm complexity is ...

Recently, the company has a new requirement. According to the previous project, change the name, logo and some resource files to repackage a new app Implementation ideas 1. Copy a project name, logo, etc. (inefficient, troublesome) ❌ 2. Multi channel packaging (convenient and fast) Implementation method Build.gradle > An ...

Realistic demand In the project, sometimes the field equipment fails, which needs to be known by the remote personnel. In addition to the way of email, the way of wechat applet is also very good. Try it today and make a demo version. 1. Wechat applet application production front end 1.1 lists file (use template and data bind ...

The whole collaborative relationship of Hander, Looper, MessageQueue, Message is like the overall operational relationship of a restaurant: Handler - Dinner Looper - Rear Chef. MessageQueue - Order machine. Message - A table-by-table order. Next we review the scene of our restaurant meals, which are divided into standard and special meals. Let ...

Class provides methods for feature composition and delegation of LiveData instances. Similar to kotlin's by, but the latter is obviously simpler. These transformations are computationally lazy and run only when the returned LiveData is observed. Article directory map switchMap summary map I should call this method mappin ...

Objective: to complete the exit and login of Android APP Idea: store multiple open activities in the List, open an addList, close a removeList, create a public APPCompatActivity base class (complete the activities add and remove in the base class, and the registration and cancellation of the broadcast receiver). When clicking ...