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MySQL table defragmentation 1. Calculate fragment size 2. Defragment 2.1 use the alter table table_name engine = innodb command to organize. 2.2 the PT online schema change tool can also be used to organize table structure and collect fragments online. 2.3 use the optimize table command to defragment. 1. Calculate fragment size To defra ...

EventBus can transfer data between Activity Fragment Service threads instead of Intent Broadcast Handler Related knowledge Four threadmodes POSTING: the thread in which the post is published and the event processing function is located MAIN: event handler runs in UI thread BACKGROUND: if the event is published in the UI th ...

Please indicate: https://mp.csdn.net/mdeditor/82504849 Bottom navigation bar radiogroup + fragemt 1. First, create a new selector file in drawable, right-click new - > drawable resource file in drawable, and create a text color selector [u text] and four other picture selectors [u home] drawable, selector [u phone] drawab ...

I studied MVP before, but it didn't work for a long time. Today I watched it again. In fact, MVP is the upgraded version of MVC. MVP includes M-Model-model, V-View-view and C-Controller-controller. Make a simple example, simple login. First, create a new project and create a layout. <?xml version="1.0" encoding="utf-8"?&gt ...

Description: I have done a bookkeeping APP before. It is easy to practice. It is developed with Eclipse; Recently, I want to improve this APP, add some new functions, and choose Android Studio to develop it; APP has improved a part of it. Now I want to sort out and record the functions that have been done.   Design sketch: You can slide the men ...

This kind of demand is often met in the application: There are different fragments in an Activity, such as MainActivity. Two different fragments require different toolbar s and menu s. How to customize Fragment's toolbar? 1. Add toolbar to the xml of fragment; 2. Add setHasOptionsMenu(true) to onCreate method of fragment; ...

Previous Hard core explains the use of life cycle of Jetpack This paper mainly introduces the significance of life cycle, basic and advanced use methods. Today, I don't want to talk much about it, just start rolling source code. This article is based on the android_9.0.0_r45 Source code, all relevant source code including comments have been upl ...

Frida interface function introduction Frida is a so level hook framework, which can help developers and security personnel analyze the so module of the specified process. It mainly provides a Python interface with simple functions and a JS interface with rich functions, which makes hook functions and modified so programmable. The interface incl ...

Recently, a machine on the line gave an alarm after running for more than 10 days, and fgc frequently appeared. After cutting off the traffic, it took the application heapdump file from the operation and maintenance side. At the beginning of fgc, I went to the container platform to check the gc logs, which are as follows: It can be seen from ...

0x001 lead to problems Let's start with a chestnut: class App extends React.Component { render() { return ( <h1></h1> <h1></h1> ) } } ReactDom.render( <App theme='dark'/>, document.getElementById('app') ) The render in the chestnut above returns two siblings ...