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我正在使用DownloadManager从Web服务器下载文件。打开下载管理器下载的文件
首先我创建DownloadManager.Request，为它添加标题，向其添加数据（标题，描述，通知，MimeType），然后将其排入队列。
之后，我等到文件完成下载后，获取uri，然后创建一个打开文件的意图。
如果我想通过选定的程序打开文件（PDF或txt），我尝试使用Google Pdf Viewer，HTML Viewer，Chrome等，它总是告诉我文件无法打开。当我想通过顶部栏DownloadManager打开它时，通知文件将正确打开。
public void getFileContent(Map<String, String> headers) {
if (downloadManager != null) {
DownloadManager.Request request = getRequest(headers);
Long fileId = downloadManager.enqueue(request);
compositeSubscription.add(RxDownloader.getInstance(getActivity())
.download(request)
.subscribe(path -> showFileContent(Uri.parse(path)),
throwable -> showError(throwable.getMessage())));
}
}
private DownloadManager.Request getRequest(Map<String, String> headers) {
Uri uri = Uri.parse(BuildConfig.API_URL + "api/v2/files/" + fileResource.getId() + "/raw");
DownloadManager.Request request = new DownloadManager.Request(uri);
request = addRequestHeaders(request, headers);
request = setRequestData(request);
return request;
}
private DownloadManager.Request addRequestHeaders(DownloadManager.Request request, Map<String, String> headers) {
for (Map.Entry<String, String> entry : headers.entrySet()) {
request.addRequestHeader(entry.getKey(), entry.getValue());
}
return request;
}
private DownloadManager.Request setRequestData(DownloadManager.Request request) {
request.setTitle(getString(R.string.file_downloader));
request.setDescription(String.format(getString(R.string.fmt_downloading), fileResource.getFileName()));
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
request.setMimeType(fileResource.getMimeType());
return request;
}
private void showFileContent(Uri uri) {
Intent target = new Intent(Intent.ACTION_VIEW);
target.setDataAndType(uri, fileResource.getMimeType());
target.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
Intent intent = Intent.createChooser(target, getString(R.string.open_file));
try {
startActivity(intent);
} catch (ActivityNotFoundException e) {
showError(getString(R.string.no_application_installed));
}
}