progress | 易学教程

Android 异步处理AsyncTask

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AsyncTask 和Handler对比 1 ） AsyncTask实现的原理,和适用的优缺点 AsyncTask,是android提供的轻量级的异步类,可以直接继承AsyncTask,在类中实现异步操作, 并提供接口反馈当前异步执行的程度 (可以通过接口实现UI进度更新),最后反馈执行的结果给UI主线程. 使用的优点: l 简单,快捷 l 过程可控使用的缺点 : l 在使用多个异步操作和并需要进行Ui变更时,就变得复杂起来. 2 ）Handler异步实现的原理和适用的优缺点在Handler 异步实现时,涉及到 Handler, Looper, Message,Thread四个对象，实现异步的流程是主线程启动Thread（子线程）àthread(子线程)运行并生成Message-àLooper获取Message并传递给HandleràHandler逐个获取Looper中的Message，并进行UI变更。使用的优点： l 结构清晰，功能定义明确 l 对于多个后台任务时，简单，清晰使用的缺点： l 在单个后台异步处理时，显得代码过多，结构过于复杂（相对性） AsyncTask介绍 Android的AsyncTask比Handler更轻量级一些，适用于简单的异步处理。首先明确Android之所以有Handler和AsyncTask，都是为了不阻塞主线程（UI线程）

HTML原生UI的实现

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本文转载于: 猿2048 网站➜ https://www.mk2048.com/blog/blog.php?id=hj12k111ib HTML5中有很多十分有趣的标签，相比于 article / section 等这些我们所熟知并且已经应用的标签，还有些标签或者因为兼容性，或者因为还处于草稿阶段而不那么为人所知。在使用 Bootstrap / Element 等UI组件时，常常看到某个标签上会应用一些如 role="dialog" 的不常见的属性，这是因为HTML语义化的需要。 role 属性主要供有障碍人士使用，作用是告诉如屏幕朗读程序等辅助程序当前元素所扮演的角色。由于HTML5标签本身已经实现了语义化， role 属性不建议被添加。而对于一些老浏览器或者一些模拟元素（如div模拟dialog）， role 属性则应该被注明。 Bootstrap 中有很多注明了 role 属性的组件，而这些组件有一部分已经被HTML5所实现，并已经标签化，如 dialog , progress 等。当然，这些标签的原始样式各个浏览器不统一，并且可以说很简陋，对此，可以通过一些自定义CSS样式来进行优化。特别说明：本文介绍的标签，目前兼容性都很差（虽然部分标签有对应的polyfill），仅供学习和了解，请勿用于生产环境。同时，DEMO仅限Chrome浏览器预览。项目地址可以在

Mediaplayer progress update to seekbar not smooth?

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问题 I am working on an app with recorder and player. I am using mediaplayer to play the recorded .wav file and meantime I want to update to a seekbar. Everything is working fine But my problem is mediaplayer progress updation to seekbar is not happening smoothly, If we are playig a small file, thumb of the seekbar jumps in seconds or between. Can anyone help me with a workaround to make it smooth seeking of the progress in seekbar. My code is shown below.I am totlay stuck here. mediaPlayerIntiate

OC-类似歌词字体颜色逐字变化的实现方法

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预期实效果图如下：如上图所示，文字的颜色会根据时间的移动，逐字变成绿色。实现方法：（1）调用方法：　　用 void UIRectFillUsingBlendMode(CGRect rect, CGBlendMode blendMode) 这个方法来实现（2）实现逻辑: 　　自定义Label，通过label的drawRect：方法获取Label的图形上下文，使用调用UIRectFillUsingBlendMode:混合填充的方式来实现label颜色的绘制（3）代码实现：　　创建自定义的label：　　.h 和.m的文件如下： ----------------.h-------------------- #import <UIKit/UIKit.h> NS_ASSUME_NONNULL_BEGIN @interface YALabel : UILabel @property (nonatomic, assign) CGFloat progress ; @end ----------------.m-------------------- #import "YALabel.h" @implementation YALabel - (void)drawRect:(CGRect)rect { [super drawRect:rect]; [[UIColor

Change style of ProgressDialog

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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由翻译强力驱动问题: Is it possible to change ProgressBar style of progress dialog. If yes, then how can I do it? 回答1: You can style your progress dialog this way: create a drawable file with your ring shape (circular_progress_dialog.xml) <rotate xmlns:android = "http://schemas.android.com/apk/res/android" android:fromDegrees = "270" android:toDegrees = "270" > <shape android:innerRadiusRatio = "2.5" android:shape = "ring" android:thickness = "2dp" android:useLevel = "true" >  <gradient android

Web前端学习笔记——HTML5与CSS3之H5-DOM扩展、H5新增API

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H5-dom扩展获取元素 document . getElementsByClassName ( 'class' ) ; //通过类名获取元素，以伪数组形式存在。 document . querySelector ( 'selector' ) ; //通过CSS选择器获取元素，符合匹配条件的第1个元素。 document . querySelectorAll ( 'selector' ) ; //通过CSS选择器获取元素，以伪数组形式存在。类名操作 Node . classList . add ( 'class' ) ; //添加class Node . classList . remove ( 'class' ) ; //移除class Node . classList . toggle ( 'class' ) ; //切换class，有则移除，无则添加 Node . classList . contains ( 'class' ) ; //检测是否存在class <!DOCTYPE html> < html lang = " en " > < head > < meta charset = " UTF-8 " > < title > Title </ title > < style > ul { list-style : none ; } li { width :

Update JProgressBar from ExecutorService

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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am pinging gateways using Java ICMP ping function. To perform fast pinging I am using ExectorService which creates threads for pinging. After address is pinged (or not) I want to update Jprogressbar after pinging. I have this code which is working but it updates Jprogressbar before job (ping thread) is finished. I want to update jprogressbar after job is finished. private int NUM_THREADS = Runtime.getRuntime().availableProcessors(); ExecutorService exec = Executors.newFixedThreadPool(NUM_THREADS); public void run() { int JProgressBarValue

How to make a progress bar with rounded corners in Xamarin forms

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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由翻译强力驱动问题: I want to display progress bar with rounded corners in Xamarin forms. I was able to do it in iOS using a custom renderer: class CustomProgressBarRenderer : ProgressBarRenderer { protected override void OnElementChanged ( ElementChangedEventArgs < Xamarin . Forms . ProgressBar > e ) { base . OnElementChanged ( e ); Control . ProgressTintColor = Color . FromRgb ( 255 , 201 , 74 ). ToUIColor (); } public override void LayoutSubviews () { base . LayoutSubviews (); var X = 1.0f ; var Y = 7.0f ; CGAffineTransform transform =

JQuery ajax progress via xhr

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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to capture ajax request`s progress. I am following article from this link http://www.dave-bond.com/blog/2010/01/JQuery-ajax-progress-HMTL5/ . It is not working as expected. Div with id progressCounter should have something in it with % as far as i understand it but nothing happens in my case. Any Help ? It seems to me like if (evt.lengthComputable) { is not working in XHR JSFIDDLE: http://jsfiddle.net/bababalcksheep/r86gM/ HTML: <div id="progressCounter"></div><br> <div id="loading">Loading</div><br> <div id="data"></div> JS: var

ability to get the progress on a Future<T> object

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With reference to the java.util.concurrent package and the Future interface I notice (unless I am mistaken) that the ability to start a lengthy tasks and be able to query on the progress only comes with the SwingWorker implementing class. This begs the following question: Is there a way, in a non-GUI, non-Swing application (imaging a console application) to start a lengthy task in the background and allow the other threads to inspect the progress ? It seems to me that there is no reason why this capability should be limited to swing / GUI applications. Otherwise, the only available option, the

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