handler | 易学教程

Android - Want app to perform tasks every second

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问题 I'm trying to get my countdown app to perform its function of updating my current time and date TextView and fire off its MyOnItemSelectedListener every second so that the app counts down dynamically instead of just when onCreate is initiated. If there is a more efficient method then rapidly firing off MyOnItemSelectedListener I would appreciate the criticism. public class TheCount extends Activity { TextView description=null; TextView dates=null; TextView times=null; TextView output=null;

C SIGSEGV Handler & Mprotect

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问题 I'm constructing a program which uses mprotect() to restrict a block of memory from accessing. When the memory is requested, a SIGSEGV is thrown which I listen for using a signal() call. Once the SIGSEGV has been detected, I need to somehow access the pointer to the memory that was requested (that threw the fault) and the size of the segment requested. Is this possible? void fifoSigHandler(){ // Needs to only remove protection from requested block of virtual memory mprotect(fifoVm,(size_t

qt quick中qml编程语言

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Qt QML 入门 — 使用C++定义QML类型发表于 2013 年 3 月 11 日注册C++类注册可实例化的类型注册不实例化的QML类型附带属性注册C++类注册可实例化的类型如果一个C++类继承自QObject，如果需要在QML中使用创建对象，则需要注册为可实例化的QML类型。使用 qmlRegisterType() 注册可实例化的QML类型，具体查看qmlRegisterType()的文档说明。 //Message.cpp class Message : public QObject { Q_OBJECT Q_PROPERTY(QString author READ author WRITE setAuthor NOTIFY authorChanged) Q_PROPERTY(QDateTime creationDate READ creationDate WRITE setCreationDate NOTIFY creationDateChanged) public: // ... }; //main.cpp #include <QtQml> ... qmlRegisterType<Message>("com.mycompany.messaging", 1, 0, "Message"); ... //aQmlFile.qml import com

How to change/reset handler post delayed time?

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问题 I'm using postDelayed method of the Handler in order to perform an action after certain amount of time: private static int time_to_wait = 2000; Handler handler = new Handler(); handler.postDelayed(new Runnable() { public void run() { // Make Action } }, time_to_wait); now in the middle of the waiting time i want to change the value of the remaining milliseconds due to some processing results, let's say it now waited 1000 ms and i want to make it begins to count from 2000 again, So, i set the

INI配置文件的解析

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我不知道怎么说才好，因为我在读INI文件的时候，往往都是用现成的函数： parse_ini_file或者是 parse_ini_string，但怎么写入，就是另外的方法了（自己实现。。。。）所以看到这篇文章的时候，我也才刚刚知道，原来，还有一个dba的函数可以用，嗯，仔细看了一下dba这个函数的installtion，发现支持inifile也是从PHP5才开始实现的。好吧，相应的dba相关的可以看看这里：http://www.php.net/manual/en/dba.installation.php，详细的还是看这里吧：http://www.php.net/manual/en/book.dba.php OK，上原文，它来自于：http://www.cardii.net/php-spl-parse-ini-file/。曾经介绍过SPL的各类型接口和迭代器。今天，在浏览PHP源码目录时，发现有个解析INI文件的例子，觉得不错，于是整理了一个实例，拿来分享下。在PHP应用程序中，配置文件不可或缺，特别是商城，CMS之类的产品，不同的客户需求不同，当然，不会每个客户开发一套程序，好办法的是每个客户有一套不同的配置文件。适合做配置文件的我曾经也说过，主要有四类：PHP数组（几乎其他的配置方法最终都是解析成为PHP数组），XML,YAML和 INI。今天只讲INI文件

OSX : Defining a new URL handler that points straight at a Python script

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问题 I'm trying to define a new URL handler under OSX that will point at a python script. I've wrapped the Python script up into an applet (right-clicked on the .py, and gone Open With -> Build Applet) I've added the following into the applet's Info.plist: <key>CFBundleURLTypes</key> <array> <dict> <key>CFBundleURLName</key> <string>Do My Thing</string> <key>CFBundleURLSchemes</key> <array> <string>dmt</string> </array> </dict> </array> I've also used the More Internet preferences pane to specify

How to return a result through multiple activities

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问题 in some part of my application there is a structure of activities like this: Activity A is my home activity where I come back after each process or flow. Activity B is a simple confirmation activity. Activity C is another confirmation activity. Activity D does some process and finally it gets back the result to my home activity ( Activity A ). Requirements: Activity B and C : must be there and cannot be merged in one. when it is clicked on the cancel button it calls finish() and does nothing.

Nginx模块开发入门

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前言 Nginx是当前最流行的HTTP Server之一，根据W3Techs的统计，目前世界排名（根据Alexa）前100万的网站中， Nginx的占有率为6.8% 。与Apache相比， Nginx在高并发情况下具有巨大的性能优势。 Nginx属于典型的微内核设计，其内核非常简洁和优雅，同时具有非常高的可扩展性。Nginx最初仅仅主要被用于做反向代理，后来随着HTTP核心的成熟和各种HTTP扩展模块的丰富，Nginx越来越多被用来取代Apache而单独承担HTTP Server的责任，例如目前淘宝内各个部门正越来越多使用Nginx取代Apache，据笔者了解，在腾讯和新浪等公司也存在类似情况。同时，大量的第三方扩展模块也令Nginx越来越强大。例如，由淘宝的工程师清无（王晓哲）和春来（章亦春）所开发的 nginx_lua_module 可以将Lua语言嵌入到Nginx配置中，从而利用Lua极大增强了Nginx本身的编程能力，甚至可以不用配合其它脚本语言（如PHP或Python等），只靠Nginx本身就可以实现复杂业务的处理。而春来所开发的 ngx_openresty 更是通过集成 LuaJIT 等组件，将Nginx本身变成了一个完全的应用开发平台。目前淘宝数据平台与产品部量子统计的产品都是基于ngx_openresty所开发。对ngxin_lua_module或ngx

Updating UI from a service (using a handler?)

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问题 I am trying to update my UI in FirstActivity when I receive a notification but is confused by runOnUiThread , Runnable and Handler . Here is what I have: I am running FirstActivity and NotificationService. When NotificationService reeives a notification, it will update FirstActivity UI. I also have another service AlarmService running. First Activity @Override public void onResume() { super.onResume(); //some other code for alarm service } NotificationService //on receiving notification

Glide生命周期原理

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本文首发于 vivo互联网技术微信公众号链接： https://mp.weixin.qq.com/s/uTv44vJFFJI_l6b5YKSXYQ 作者：连凌能 Android App中图片的展示是很基本也很重要的一个功能，在Android平台上有很多的图片加载解决方案，但是官方认可的是Glide。Android App的页面是有生命周期的，Glide比较好的一个功能就是具有生命周期管理功能，能够根据页面和APP的生命周期来管理图片的加载和停止，也开放接口供用户在内存紧张时手动进行内存管理。本文重点是生命周期源码的分析，不会从简单的使用着手。一、综述这是Glide源码分析的第二篇文章，第一篇是《Glide缓存流程》，从资源的获取流程对源码进行分析。本篇会聚焦于生命周期模块的原理。开始之前先思考下面这几个问题： Glide怎么实现页面生命周期？ Glide为什么对Fragment做缓存？ Glide如何监听网络变化？ Glide如何监测内存？二、Glide生命周期传递先来看with函数的执行, 会构造glide单例，而 RequestManagerRetriever在initializeGlide中会进行构造。 // Glide.java public static RequestManager with(@NonNull Activity activity) {

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