progress | 易学教程

Android基本功:异步任务（AsyncTask）

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一、解决新线程无法更新UI组建问题的方案为了解决新线程不能更新UI组建的问题，Andorid提供了如下几种解决方案：使用Handler实现线程之间的通信。 Activity.runOnUiThread(Runnable)。 View.post(Runnable)。 View.postDelayed(Runnable)。二、ANR(Application Not Responding)异常 Android默认约定当UI线程阻塞超过20秒将会引发ANR(Application Not Responding)异常。但实际上，不要说20秒，即使是5秒甚至2秒，用户都会感到十分不爽。因此，没必要去记这个20秒的时间限度。总之，开发者必须牢记：不要在UI线程中执行一些耗时操作。三、AsyncTask抽象类 AsyncTask<Params,Progress,Result>是一个抽象类，通常用于被继承，继承AsyncTask需要指定如下三个泛型参数： Params：启动任务执行的输入参数的类型。 Progress：后台任务完成进度值的类型。 Result：后台执行任务完成后返回结果的类型。四、AsyncTask的特点更轻量级一些，适用于简单的异步处理，不需要借助线程和Handler即可。五、使用AsyncTask的步骤 1.创建AsyncTask的子类，并为三个泛型参数指定类型

HTML Loading Animation

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问题 I have a website that loses layout scheme while the page isn't loaded. What I'd like to do is to have an animation linked to the loading progress, like a progress bar but without the bar. For example, a simple animation that would link the progress to the opacity of the logo. So, when the page was 50% loaded, the logo was at 50% opacity; when the logo was 100% the page was loaded and the loading progress would .fadeOut() . I understand I can use $(window).load() to hide the animation <div> .

LINQ to SQL SubmitChangess() progress

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问题 I'm using LINQ to SQLto import old DBF files into MSSQL. I'm reading all rows and adding them to database using ctx.MyTable.InsertOnSubmit(row) After reading phase is completed I have around 100 000 pending inserts. ctx.SubmitChanges() naturally is taking a long time. Is there any way to track progress of the ctx.submitchanges() ? Can ctx.Log somehow be used for this purpose? Update : Is it possible to use ctx.GetChangeSet().Inserts.Count and track insert statements using the Log? Dividing

LINQ to SQL SubmitChangess() progress

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How to learn WriteAllBytes progress

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问题 Can I use a progress bar to show the progress of File.WriteAllBytes(file, array) in C#? 回答1: No. You'll need to write the bytes in chunks using a loop. Something like the following should get you started. Note that this needs to be running in a background thread. I you are using WinForms, you can use a BackgroundWorker . using(var stream = new FileStream(...)) using(var writer = new BinaryWriter(stream)) { var bytesLeft = array.Length; // assuming array is an array of bytes var bytesWritten =

Java SAX parser progress monitoring

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问题 I'm writing a SAX parser in Java to parse a 2.5GB XML file of wikipedia articles. Is there a way to monitor the progress of the parsing in Java? 回答1: Use a javax.swing.ProgressMonitorInputStream. 回答2: Thanks to EJP's suggestion of ProgressMonitorInputStream , in the end I extended FilterInputStream so that ChangeListener can be used to monitor the current read location in term of bytes. With this you have finer control, for example to show multiple progress bars for parallel reading of big

Cancellable set of asynchronous operations with progress reporting in iOS

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问题 Suppose that I use another SDK (which I do not have control of) with an API that imports 1 file asynchronously, and calls a completion callback on completion. The following is an example API. func importFile(filePath: String, completion: () -> Void) I need to import 10 files (one by one) using this API, but I need it to be cancellable, e.g. after Files 1,2,3 has been successfully imported, while File 4 is being imported, I want to be able to cancel the whole set of operations (import of the

WPF multithreaded progress dialog

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问题 Updated This is kind of an interesting problem I am experiencing. I need to have a progress dialog show when a background process is running. Normally, this would work but the problem is that I need to set public static data within the background process. Here is an example of what I am attempting to accomplish: public partial class MainWindow : Window { public static Service binding; public static Result lr; public progressDialog dlg; private void login() { string sPwd = txtPwd.Password;

Displaying a progress bar showing the progress of a form submission

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问题 This question is not totally answered, please fell free to contribute ! I'm trying to display a simple progress bar while a large form is submitted. The form contains a dozen of fields, plus some file upload fields, where the user can select a picture. Then, when he clicks on a Create button, the form with data and pictures are submitted and the entity is created in DB. (only one click to submit the form AND the pictures). Everything works fine, but I'd like to display a progress bar during

Is it possible to show progress bar when download via Retrofit 2 Asynchronous?

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问题 @Streaming @GET Call<ResponseBody> downloadSong(@Url String url); Above code is used to download file asynchronously using retrofit. I want get the progress of download, if there any possibility of pause/ resume please answer that too 回答1: At last I got my answer. For that we need to use rxjava along with retrofit. DownloadProgressListener.java public interface DownloadProgressListener { void update(long bytesRead, long contentLength, boolean done); } DownloadProgressResponseBody.java public