Foreword In Android, we often encounter communication scenarios between threads. Let’s talk about the most important asynchronous message mechanism Handler in Android. Asynchronous message mechanism Handler Handler is the most important asynchronous messaging mechanism in Android. It consists of four parts: Handler, Message, MessageQueue, and Looper. 1. The main thread creates a Handler object (if […]
Tag: handler
The principle of UI thread from the perspective of Android Handler/Looper
Overview The Handler/Looper mechanism is a non-important and basic mechanism of the Android system. This mechanism is often used for reference even when developing application frameworks on rtos or linux operating systems. Through this mechanism, a thread can process events in a loop, and the event processing logic is in the Handler’s handleMessage. This article […]
Explanation of Handler message mechanism developed by Android
Handler message mechanism If you want to make an Android app responsive, then you must prevent its UI thread from being blocked. Likewise, offloading these blocking or computationally intensive tasks to worker threads will also improve the responsiveness of the program. However, the execution results of these tasks usually require re-updating the display of UI […]
Qt’s qInstallMessageHandler outputs detailed logs and saves them to a file
Qt’s qInstallMessageHandler (output detailed log) Installs a previously defined message handler, returning a pointer to the previous message handler. A message handler is a function that prints debugging information, warning information, critical error messages, and fatal error messages. The Qt library (debug mode) contains hundreds of warning messages printed when an internal error occurs (usually […]
SpringMVC(3) — HandlerMapping
1. Background introduction Each HTTP request will be mapped by HandlerMapping to an independent HandlerExecutionChain instance, which contains processor objects and interceptor objects. The function of the HandlerMapping interface is to map HTTP requests to the corresponding processor objects. It provides a flexible mapping mechanism and supports a variety of URL mapping rules and interceptor […]
Quick start Mybatis TypeHandler
theme: orange MyBatis TypeHandler is one of the important components in the MyBatis framework, used to handle conversion between Java objects and data types in the database. Introduction to MyBatis TypeHandler MyBatis TypeHandler is an important component in the MyBatis framework, used to handle conversion between Java objects and data types in the database. In […]
MicroStation XM section handler source code-module-CommFunction
The engineering measurement section processing program written in MicroStation XM VBA is incompatible with the current MicroStation CE and requires slight adjustments before it can run in CE. Most of the codes, functions, and processes in the code are the same as the current high version and can be used as a reference. The code […]
Vue template syntax [Part 2] Event handler, form, custom component, communication component
Table of Contents 1. Event handler 1.1 Commonly used event modifiers 1.2 Commonly used key modifiers 2. Form in vue 3. Custom components 4. Communication components 1. Event handler 1.1 Commonly used event modifiers Vue’s event modifiers are used to change the default behavior of events or add additional functionality. The following are some commonly […]
[Vue] Template syntax, event handlers and comprehensive cases, custom components, component communication
1. Event handler We previously used the v-on directive for event monitoring 1. Event modifier In Vue we call modifiers through the instruction suffix represented by a dot (.), such as: .stop: Prevent events from bubbling. This modifier will stop the event from bubbling further to the parent element when the event fires. Equivalent to […]
ansible-handlers change execution operations
1. ansible-handlers perform operations on changes 1) Write the configuration file of the playbook handlers 1 [root@test-1 bin]# vim /ansible/nginx/bin/handlers.yaml 2 [root@test-1 bin]# cat /ansible/nginx/bin/handlers.yaml 3 — 4 – hosts: web1 5 remote_user: root 6 gather_facts: no 7 8 tasks: 9 – name: Copy nginx config file 10 copies: 11 src: /ansible/nginx/conf/site.conf 12 dest: /etc/nginx/conf.d/site.conf […]