Question

我使用此代码从链接下载到sdcard

此代码在模拟器中完全运行但在移动设备中无效

在创建的移动文件中，但文件容量为零且未下载完整

如何修复它？！

注意：我理解我的代码不适用于4版本，有什么问题？！

THX

public class FileDownloader {

    public static void download(final String downloadPath, final String filepath, final OnProgressDownloadListener listener) {
        Thread thread = new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    URL url = new URL(downloadPath);

                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setDoOutput(true);
                    connection.connect();

                    int fileSize = connection.getContentLength();

                    File file = new File(filepath);
                    if (file.exists()) {
                        file.delete();
                    }

                    FileOutputStream outputStream = new FileOutputStream(filepath);
                    InputStream inputStream = connection.getInputStream();
                    byte[] buffer = new byte[G.DOWNLOAD_BUFFER_SIZE];
                    int len = 0;
                    int downloadedSize = 0;
                    while ((len = inputStream.read(buffer)) > 0) {
                        outputStream.write(buffer, 0, len);
                        downloadedSize += len;
                        final float downloadPercent = 100.0f * (float) downloadedSize / fileSize;
                        Log.i("PER", "" + downloadPercent);

                        if (listener != null) {
                            G.HANDLER.post(new Runnable() {

                                @Override
                                public void run() {
                                    listener.onProgressDownload((int) downloadPercent);
                                }
                            });
                        }
                    }
                    outputStream.close();
                }
                catch (MalformedURLException e) {
                    e.printStackTrace();
                }
                catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
        thread.start();
    }
}

Answer 1

我删除了这一行并完成了工作：

connection.setDoOutput(true);

文件下载不适用于移动设备

1 个答案: