Question

我需要从互联网下载文件并在Android Studio片段中读取其文本内容

我已经设法通过下载管理器下载文件，但是无法访问和读取文件。

    File dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
    String downloadPath = dir.getAbsolutePath();
    String path = downloadPath + "/" + fileName;
    DownloadManager dm;
dm = (DownloadManager) getActivity().getSystemService(Context.DOWNLOAD_SERVICE);
                Uri uri = Uri.parse(pdfLink);
                DownloadManager.Request request = new DownloadManager.Request(uri);
                //request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
                request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
                request.setTitle(fileName);
                //it crushes at this line below
                request.setDestinationInExternalPublicDir(downloadPath, fileName);
                Long reference = dm.enqueue(request);
 request.setDestinationInExternalPublicDir(downloadPath, fileName);

我尝试了这段代码来读取它，但是如果我插入随机输入（例如“ ashdbas”），则在插入文件路径时应用程序会崩溃，尽管它什么也不会读取*但不会崩溃。

                int ch;
                StringBuilder str=new StringBuilder();
                try {
                    FileInputStream fis = getActivity().openFileInput(path);
                    try {
                        while ((ch=fis.read())!=-1)
                            str.append((char)ch);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
                //convert to string
                String s=str.toString();

这是我要下载的文件：https://docs.google.com/document/d/1ALWFQ57sB7mdcI5zN6s_6_7hQfKR-B8KgQfN2aK8kbI/edit?usp=sharing

另外，我注意到下载文件夹中充满了具有相同名称的文件，它们之间应该没有任何区别吗？

如何下载文件并在片段中读取文件？

0 个答案: