Question

我正在尝试从我的在线资源下载文件。我遇到的问题是浏览器窗口在加载到下载服务器时不断出现。有什么方法可以隐藏这个吗？我已经在doInBackground的{{1}}部分中使用了此代码，但似乎无法隐藏浏览器栏。这是我的代码：

AsyncTask

谢谢大家！

Answer 1

这里是我的代码示例，没有浏览器下载：

private TextView mFileDownloadProgressBarPercent;
private ProgressBar mFileDownloadProgressBar;
private Runnable mFileExecutionTaskAfterDownload;    
public String fileDownloadedResultPath;

和asynctask：

class DownloadFileFromURL extends AsyncTask<String, String, String> {


         // Before starting background thread
         // Show Progress Bar Dialog
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            if(mFileDownloadProgressBar != null)
                mFileDownloadProgressBar.setVisibility(View.VISIBLE);
            if(mFileDownloadProgressBarPercent != null)
                mFileDownloadProgressBarPercent.setVisibility(View.VISIBLE);
        }


         // Downloading file in background thread
        @Override
        protected String doInBackground(String... f_url) {
            int count;
            try {
                URL url = new URL(f_url[0]);
                URLConnection conection = url.openConnection();
                conection.connect();

                // getting file length
                int lenghtOfFile = conection.getContentLength();

                // input stream to read file - with 8k buffer
                InputStream input = new BufferedInputStream(url.openStream(), 8192);

                String extStorageDirectory = Environment.getExternalStorageDirectory()
                        .toString();
                File folder = new File(extStorageDirectory, "pdf"); // for example we are downloading pdf's so store in pdf dir.
                folder.mkdir();
                File subFolder = new File(extStorageDirectory+"/pdf", "fileId"); // here you can place files by id of category etc..
                subFolder.mkdir();


                String fileName = url.toString().substring(url.toString().lastIndexOf("/")+1);
                fileDownloadedResultPath = subFolder + "/" +  fileName;
                // Output stream to write file
                OutputStream output = new FileOutputStream(subFolder + "/" +  fileName);

                byte data[] = new byte[1024];

                long total = 0;

                while ((count = input.read(data)) != -1) {
                    total += count;
                    publishProgress(""+(int)((total*100)/lenghtOfFile));

                    // writing data to file
                    output.write(data, 0, count);
                }

                // flushing output
                output.flush();

                // closing streams
                output.close();
                input.close();

            } catch (Exception e) {
                Log.e("Error: ", e.getMessage());
            }

            return null;
        }

        protected void onProgressUpdate(String... progress) {
            if(mFileDownloadProgressBar != null)
                mFileDownloadProgressBar.setProgress(Integer.parseInt(progress[0]));
            if(mFileDownloadProgressBarPercent != null)
                mFileDownloadProgressBarPercent.setText(mContext.getString(R.string.downloading_file) + " " + String.format("%s%%",Integer.parseInt(progress[0])+""));
        }

        @Override
        protected void onPostExecute(String file_url) {
            if(mFileDownloadProgressBar != null)
                mFileDownloadProgressBar.setVisibility(View.GONE);
            if(mFileDownloadProgressBarPercent != null)
                mFileDownloadProgressBarPercent.setVisibility(View.GONE);
            if(mFileExecutionTaskAfterDownload != null)
                mFileExecutionTaskAfterDownload.run();
        }

    }

从在线下载文件时如何隐藏浏览器

1 个答案: