如何在Android中以编程方式从net下载文件？ [英] How to download files from net programmatically in Android?

问题描述

在我的应用程序中，从Web下载文件的负载约为200Mb文件（压缩）。如何在Android中以编程方式下载文件？实际上，我关心的是代码的性能。我该如何处理介于两者之间的错误和网络问题？

In my application downloading loads of files from web they were around 200Mb files(Zipped). How do I download files programmatically in Android? Actually my concern is about performance of code. How do I handle errors and network problem in between?

推荐答案

以下是我最近为此编写的一些代码：

Here's some code that I recently wrote just for that:

    try {
      URL u = new URL("http://your.url/file.zip");
      InputStream is = u.openStream();

      DataInputStream dis = new DataInputStream(is);

      byte[] buffer = new byte[1024];
      int length;

      FileOutputStream fos = new FileOutputStream(new File(Environment.getExternalStorageDirectory() + "/" + "file.zip"));
      while ((length = dis.read(buffer))>0) {
        fos.write(buffer, 0, length);
      }

    } catch (MalformedURLException mue) {
      Log.e("SYNC getUpdate", "malformed url error", mue);
    } catch (IOException ioe) {
      Log.e("SYNC getUpdate", "io error", ioe);
    } catch (SecurityException se) {
      Log.e("SYNC getUpdate", "security error", se);
    }

这将下载文件并将其放在您的sdcard中。

This downloads the file and puts it on your sdcard.

您可能可以修改此设置以满足您的需求。 ：）

You could probably modify this to suit your needs. :)

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