Android - 下载文件时显示进度条

Question

我需要一些帮助。我一直在寻找几天来试图找到解决我的问题的方法。我想在 Android 中下载文件时显示进度条。我找到了足够的文件来下载文件，但一直在努力弄清楚如何显示进度条。

这是我的下载代码:

            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();

Answer 1

使用异步任务。有许多在线教程可以准确说明您要执行的操作。