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我正在使用DownloadManager從Web服務器下載文件。打開下載管理器下載的文件
首先我創建DownloadManager.Request，爲它添加標題，向其添加數據（標題，描述，通知，MimeType），然後將其排入隊列。
之後，我等到文件完成下載後，獲取uri，然後創建一個打開文件的意圖。
如果我想通過選定的程序打開文件（PDF或txt），我嘗試使用Google Pdf Viewer，HTML Viewer，Chrome等，它總是告訴我文件無法打開。當我想通過頂部欄DownloadManager打開它時，通知文件將正確打開。
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));
}
}