handler

Threading in Android to process long running processes

由 别说谁变了你拦得住时间么 提交于 2019-12-31 02:08:08
问题 Ok, here is my problem. I want to learn AsyncTask, Threading and Handler to process long running tasks. I used Android Cook Book and New Boston Android tutorial, but I can't make it work. I need to change the progress bar message. This is not for project, but to learn threading. Threading is really hard for me. So if you have any tutorial or guide to understand threading please let me know. Meanwhile I tried Handler class, but it didn't work. So I tried AsyncTask. But it does not work either.

Does postDelayed cause the message to jump to the front of the queue?

由 蹲街弑〆低调 提交于 2019-12-31 01:06:07
问题 I was looking on the Android docs for postDelayed post delayed documentation This is similar to another question - https://stackoverflow.com/questions/25820528/is-postdelayed-relative-to-when-message-gets-on-the-queue-or-when-its-the-actual - I had a while back but its a different situation(and worded a lot clearer in my mind) Basically heres what the docs say for that this method - "Causes the Runnable to be added to the message queue, to be run after the specified amount of time elapses.

netty4简易教程

由 混江龙づ霸主 提交于 2019-12-31 00:42:51
近来有空，研究了一下netty。netty5还仅仅是beta版本号。官方建议使用netty4。 这个实例中，Client通过控制台输入信息，与Server端通信。 对于普通开发人员来说，netty4的经常使用接口有：SimpleChannelInboundHandler/SimpleChannelOutboundHandler、ChannelInitializer、encoder和decoder相关的类。 server端： 1、编写handler类 import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; public class ServerHandler extends SimpleChannelInboundHandler { @Override public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception { System.out.println("server:" + "channelRead:" + msg); ctx.writeAndFlush("Received your message !"); } } 2、注冊服务

初冬太冷？圣诞无处可去？那跟我一起来学Android吧

由 ＊爱你＆永不变心＊ 提交于 2019-12-30 23:55:28
又到年底了，每到这个时候，我们都会慢慢反思，这一年都做了什么？有什么进步？年初的计划都实现了吗？明年年初有跳槽的底气了吗？况且今年的互联网环境太差，需要自己有足够的知识储备，才能够应对这凌冽的寒风。 本文主要是整理了中高级安卓需要会的（或者说面试被频繁问到的内容），主要作为参考大纲，之后会陆续更新每个详细部分，供大家参考，互相学习。 面试板块(PDF版如下)： BAT面试合集（Binder，组件化插件化，热修复，AOP，QQ换肤，虚拟机，https，线程池原理，音视频原理） 算法合集（Hash,KMP 等） 中小厂面试合集（内存泄漏，Handler，View，MVC.MVP.MVVM，） 大厂相关更新技术（Glide,数据库，NDK） 面试小知识（java小知识） 设计模式（设计模式原则和分类） 数据结构（数据结构等等） 网络编程（三次握手和四次握手，Volley，OKHttps,Retrofit） 源码解析(属性动画实现原理等） 多线程解析（线程同步，进程线程） 性能优化（Webview,内存泄漏和内存溢出等） （ 顺手留下GitHub链接，需要获取相关面试或者面试宝典核心笔记PDF等内容的可以自己去找 ） https://github.com/xiangjiana/Android-MS 一丶设计模式与使用场景 (如）建造者模式： 将一个复杂对象的构建与它的表示分离

drf-display各模块解析

由 送分小仙女□ 提交于 2019-12-30 21:28:02
目录 APIView 请求模块 解析模块 响应模块 渲染模块(了解) 异常模块 APIView APIView继承了View, 并重写了as_view方法 重写的as_view主体上还是View的as_view, 返回的还是view方法 重写的as_view的就是==局部禁用了csrf认证== Copy# 继承了View class APIView(View): @classmethod def as_view(cls, **initkwargs) if isinstance(getattr(cls, 'queryset', None), models.query.QuerySet): def force_evaluation(): raise RuntimeError( 'Do not evaluate the `.queryset` attribute directly, ' 'as the result will be cached and reused between requests. ' 'Use `.all()` or call `.get_queryset()` instead.' ) cls.queryset._fetch_all = force_evaluation # 可见, 重写的as_view的主体还是View的as_view view = super()

django tutorial: custom 404 and 500 views

由 浪尽此生 提交于 2019-12-30 19:26:10
问题 Windows 7 Python 2.7.3 Django 1.5 python manage.py runserver I am following the tutorial as available at 'https://docs.djangoproject.com/en/1.5/intro/tutorial03/' I got as far as the 'Write a 404 (page not found) view' before things got wierd. I have tried to work out how to make a custom 404 view. However, I am not sure: A. Where exactly the custom 404.html file should reside. Should it be in my project directory tree or in my Django directory tree. My project directory tree looks like this,

信号

由 断了今生、忘了曾经 提交于 2019-12-30 13:54:57
文章目录 一、信号及其处理过程 1、概述 1.1、发送信号 1.2、待处理信号集合 1.3、接收信号与阻塞信号 1.4 信号处理函数的终止 2、发送信号 2.1、kill函数 2.1.1、其中pid的值： 2.1.2、信号发送的权限： 2.1.3、错误返回的errno标志 2.1.4、Linux权限管理（拓展） 2.2、发送信号的其他方式 2.2.1、raise函数(向自身发送信号） 2.2.2、killpg函数 3、信号集、待处理信号、阻塞信号 3.1、信号集处理： 3.2、处于等待状态的信号 3.3、阻塞信号传递（信号掩码） 3.3.1、概述 3.3.2、sigprocmask函数 4、改变信号处理 4.1、信号的默认行为 4.2、signal()函数 4.2.1、可移植性说明 4.3、sigaction()函数 4.3.1、与signal函数的比较 4.3.2、sa_flag信号说明 4.3.2.1、signal函数实现——使用sa_flag的实例 4.3.2.2、abort函数实现——使用sa_flag的实例 4.3.2.2.1、abort函数的功能 4.3.2.2.2、abort函数的实现 4.3.2.3、sigaltstack函数——实现SA_ONSTACK的基础 5、常用信号及其说明 5.1 SIGKILL(终止进程)和SIGSTOP(停止进程） 5.1.1

Updating the List UI with Timer

由 僤鯓⒐⒋嵵緔 提交于 2019-12-30 11:53:43
问题 I am trying to update the list view with timer.I have implemented the android UI timer tutorial but my problem is how to use it for List view where i need to update the each row of list after a certain interval. how does the handler will update the each row of the list(i.e suppose a textview is inside the eachrow where i'll display the updated values.) public class ListAdapter extends BaseAdapter { private List<String> messages; private Context mContext; public ListAdapter(Context context ,

Updating the List UI with Timer

由 做~自己de王妃 提交于 2019-12-30 11:52:08
问题 I am trying to update the list view with timer.I have implemented the android UI timer tutorial but my problem is how to use it for List view where i need to update the each row of list after a certain interval. how does the handler will update the each row of the list(i.e suppose a textview is inside the eachrow where i'll display the updated values.) public class ListAdapter extends BaseAdapter { private List<String> messages; private Context mContext; public ListAdapter(Context context ,

Prevent “inherited” signal handlers from executing

由 泄露秘密 提交于 2019-12-30 10:42:43
问题 Defining a signal handler in a "base" component is pretty nifty when that functionality is going to be frequently used by many derived components. However, in QML installing a new handler in a derived component does not replace the original handler, it merely stacks on top of it. As handlers are not really unique per signal, they are merely connections, and you can have multiple connections per signal. One solution is to simply not provide a default handler in the base component, but then you
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