Android:如何限制下载速度 [英] Android: how to limit download speed

问题描述

我使用AndroidHttpClient从互联网下载视频.有多种方法可以提高下载速度，但是我想知道如何使用AndroidHttpClient或HttpURLConnection降低下载速度?该解决方案是否有任何接口或配置?

I use AndroidHttpClient to download videos from internet. There are ways to increase download speed, but I want to know how to slow down the download speed using AndroidHttpClient or HttpURLConnection ? Is there any interfaces or configuration for that or some solution ?

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进行了一些测试，发现正如Matthew Franglen所建议的，Thread.sleep(value)可以作为一种解决方案.主要魔术是确定value使线程进入睡眠状态.测试结果如下

Have done some test, found that as Matthew Franglen suggested, Thread.sleep(value) can be a solution. The main magic is to determine the value for thread to sleep. The test result is as below

no thread sleep
11-06 20:05:14.510: D/DownloadThread(6197): Current speed = 1793978

sleep 0.001s
11-06 20:02:28.433: D/DownloadThread(5290): Current speed = 339670

sleep 0.062
11-06 20:00:25.382: D/DownloadThread(4410): Current speed = 65036

sleep 0.125s
11-06 19:58:56.197: D/DownloadThread(3401): Current speed = 33383

sleep 0.25s
11-06 19:57:21.165: D/DownloadThread(2396): Current speed = 15877

sleep 0.5s
11-06 19:55:16.462: D/DownloadThread(1253): Current speed = 8061

sleep 1s
11-06 19:53:18.917: D/DownloadThread(31743): Current speed = 3979

测试表明，如果睡眠一秒钟，下载量将急剧下降至大约1/450！

The test shows if sleep for one second, the download drops drastically to about 1/450 !

这取决于下载循环中执行的操作种类，并取决于环境.这是特定情况下的实验结论

While this depends on what kinds operations have done in the downloading loop, and depends on the enviromnet. this is a experimental conclusion under specific case

推荐答案

降低下载速度非常简单.只是从InputStream读得更慢:

Slowing the download speed is quite simple. Just read from the InputStream more slowly:

public byte[] rateLimitedDownload(InputStream in, int bytesPerSecond) throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    byte[] buffer = new byte[bytesPerSecond];
    int read;

    while ((read = in.read(buffer)) != -1) {
        out.write(buffer, 0, read);
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            // nothing
        }
    }
    return out.toByteArray();
}

此代码不是完美的-实际花费的所有时间都不会考虑在内，并且读取的次数可能少于预期.它应该可以给您一个想法.

This code isn't perfect - any time spent actually reading from in is not considered, and reads may be less than expected. It should give you an idea though.

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