[英]Opening a file downloaded by download manager
我正在使用DownloadManager
從Web服務器下載文件。
首先,我創建DownloadManager.Request
,向其添加標題,向其添加數據(標題,描述,通知,MimeType),然后使其入隊。
之后,我等待文件下載完成,獲取uri
,然后創建一個意圖來打開文件。
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和其他程序,它總是告訴我無法打開文件。 當我想通過頂部欄DownloadManager
Notification打開它時,文件正確打開。
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));
}
}
好的,我通過在請求的外部公共目錄中設置保存目標來解決了該問題,因為默認的下載目標是共享卷,如果需要回收空間以供系統使用,系統可能會刪除您的文件。 https://developer.android.com/reference/android/app/DownloadManager.Request.html
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