Programming VIP

** Can RFID tags be read through the NFC function of the mobile phone ** Some labels can be read RFID tags have many types: according to different frequencies, they can be divided into low frequency (LF), high frequency (HF), ultra-high frequency (UHF) and microwave (MW) electronic tags. 1. The typical working frequency of high-frequency c ...

Wechat H5 payment within App Let's take a look at the demonstration effect first I want to use the sdk of yungouos platform for wechat H5 payment, but I can't find the Demo developed in AS, so I have to think about it myself. Since I was also the first time to make wechat payment, I encountered many problems and consulted a lot of materials ...

Fluent learning (3) picture component Review the basic framework built before import 'package:flutter/material.dart'; void main(){ runApp(MyApp()); } class MyApp extends StatelessWidget{ @override Widget build(BuildContext context){ return MaterialApp( home:Scaffold( appBar:AppBar (title: Text("flutter demo") ...

A memory leak occurs when an application allocates memory for an object and the object is not released when it is no longer used. Over time, the leaked memory will accumulate, resulting in poor application performance or even crash. Leaks can occur on any program and platform, but due to the complexity of the activity life cycle, this situation ...

file store The file storage method is not limited by type. Some data can be saved directly in the device in the form of files, such as text files, PDF, audio, pictures, etc. When storing complex types of data, file storage is usually used. Java provides a complete set of I/ О Flow system, through I/ О Streaming can easily access files on d ...

1, Android animation overview Android animation can be divided into three categories: Frame Animation, Tweened Animation and attribute animation. Among them, Frame Animation and gap animation belong to traditional animation, Android 3 For the attribute animation after 0, all the contents of the gap animation can be realized through the attribu ...

Okhttp is a commonly used network framework. Okhttp is developed by square company. It is necessary to master the usage of okhttp and its internal working principle. 1, Introduction mode   1.gradle introduction   implementation 'com.squareup.okhttp3:okhttp:3.14.7' implementation 'com.squareup.okio:okio:1.17.5' 2. Authority <use ...

preface When injecting code into an apk file, we often face the decompiled smali code rather than the direct java source code file. Therefore, it is necessary to understand the basis of smali syntax. Here we first introduce Dalvik virtual machine: Dalvik is a virtual machine specially designed by Google for Android platform. Although Android p ...

Original author: Puke Original link: http://puke3615.github.io/2017/03/21/Android-Studio-Code-Block-Mark/ Original copyright notice: unless otherwise stated, all articles of this blog adopt CC BY-NC-SA 4.0 license agreement. Reprint please indicate the source! Android Studio code block marking allows us to quickly locate the code logic block. ...

Know channel channel is a concurrent and secure queue, which can connect processes and realize the communication of different processes. Several types of channels are defined in the Library. They can store multiple elements internally, but they are different in terms of whether the send call can be suspended. For all Channel types, the behavi ...