Android的 - 显示一个进度条，而下载文件 [英] Android - Displaying a progress bar while downloading a file

问题描述

我需要一些帮助。我一直在寻找了几天试图找到解决我的问题。我想显示一个进度条，同时下载在Android中的文件。我发现足够的下载文件，但一直在努力弄清楚如何显示进度条。

下面是我的下载code：

 字符串SURL =的getString（R.string.DOWNLOAD_URL）+的getString（R.string.DATABASE_FILE_NAME）;
        HttpClient的HttpClient的=新DefaultHttpClient（）;
        HTTPGET HTTPGET =新HTTPGET（SURL）;
        HTT presponse响应= httpclient.execute（HTTPGET）;
        HttpEntity实体= response.getEntity（）;
        标题[] clHeaders = response.getHeaders（内容长度）;
        标题标题= clHeaders [0];
        INT totalSize =的Integer.parseInt（header.getValue（））;
        INT downloadedSize = 0;
        如果（实体！= NULL）{
            InputStream的流= entity.getContent（）;
            中byte buf [] =新的字节[1024 * 1024];
            INT numBytesRead;

            的BufferedOutputStream FOS =新的BufferedOutputStream（新的FileOutputStream（文件））;
            做 {
                numBytesRead = stream.read（BUF）;
                如果（numBytesRead大于0）{
                    fos.write（BUF，0，numBytesRead）;
                    downloadedSize + = numBytesRead;
                    //的UpdateProgress（downloadedSize，totalSize）;
                }
            }而（numBytesRead大于0）;
            fos.flush（）;
            fos.close（）;
            stream.close（）;
            。httpclient.getConnectionManager（）关闭（）;
 

解决方案

使用的AsyncTask的。有几十个教程在线为正是你想要做什么。

I need some help. I have been searching for days trying to find solution to my problem. I would like to show a progress bar while downloading a file in Android. I found enough to download the file but have struggled to figure out how to display a progress bar.

Here is my download code:

            String sURL = getString(R.string.DOWNLOAD_URL) + getString(R.string.DATABASE_FILE_NAME);
        HttpClient  httpclient = new DefaultHttpClient();
        HttpGet httpget = new HttpGet(sURL);
        HttpResponse response = httpclient.execute(httpget);
        HttpEntity entity = response.getEntity();
        Header[] clHeaders = response.getHeaders("Content-Length");
        Header header = clHeaders[0];
        int totalSize = Integer.parseInt(header.getValue());
        int downloadedSize = 0;
        if (entity != null) {
            InputStream stream = entity.getContent();
            byte buf[] = new byte[1024 * 1024];
            int numBytesRead;

            BufferedOutputStream fos = new BufferedOutputStream(new FileOutputStream(file));
            do {
                numBytesRead = stream.read(buf);
                if (numBytesRead > 0) {
                    fos.write(buf, 0, numBytesRead);
                    downloadedSize += numBytesRead;
                    //updateProgress(downloadedSize, totalSize);
                }
            } while (numBytesRead > 0);
            fos.flush();
            fos.close();
            stream.close();
            httpclient.getConnectionManager().shutdown();

解决方案

Use an asynctask. There are dozens of tutorials online for exactly what you're trying to do.

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