我的是一个 cordova 混合应用程序。我已经安装了this从服务器(url)下载pdf文件的插件。它在运行 Android 7.0 的设备上运行良好。在 Oreo 设备上安装相同的应用程序时,没有任何反应,一段时间后,我看到“下载不成功”消息。这可能是什么原因?
我还将之前工作的手机升级到 8.0 并进行了测试。它失败了。所以当操作系统是 Oreo 时,这是行不通的。
private void startDownload(String message, CallbackContext callbackContext) {
if (message != null && message.length() > 0) {
String filename = message.substring(message.lastIndexOf("/")+1, message.length());
try {
filename = URLDecoder.decode(filename,"UTF-8");
} catch (UnsupportedEncodingException e) {
callbackContext.error("Error in converting filename");
}
android.app.DownloadManager downloadManager = (android.app.DownloadManager) cordova.getActivity().getApplicationContext().getSystemService(Context.DOWNLOAD_SERVICE);
Uri Download_Uri = Uri.parse(message);
android.app.DownloadManager.Request request = new android.app.DownloadManager.Request(Download_Uri);
//Restrict the types of networks over which this download may proceed.
request.setAllowedNetworkTypes(android.app.DownloadManager.Request.NETWORK_WIFI | android.app.DownloadManager.Request.NETWORK_MOBILE);
//Set whether this download may proceed over a roaming connection.
request.setAllowedOverRoaming(false);
//Set the title of this download, to be displayed in notifications (if enabled).
request.setTitle(filename);
//Set a description of this download, to be displayed in notifications (if enabled)
request.setDescription("DataSync File Download.");
//Set the local destination for the downloaded file to a path within the application's external files directory
request.setDestinationInExternalFilesDir(cordova.getActivity().getApplicationContext(), Environment.DIRECTORY_DOWNLOADS, filename);
//Set visiblity after download is complete
request.setNotificationVisibility(android.app.DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
long downloadReference = downloadManager.enqueue(request);
callbackContext.success(message);
} else {
callbackContext.error("Expected one non-empty string argument.");
}
}
最佳答案
确保您已在 Manifest.xml 文件中添加此权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
and use the following code
DownloadManager.Request request = new DownloadManager.Request(
Uri.parse(url));
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED); //Notify client once download is completed!
request.setDestinationInExternalPublicDir(
Environment.DIRECTORY_DOWNLOADS, URLUtil.guessFileName(
url, contentDisposition, mimeType));
DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
dm.enqueue(request);
Toast.makeText(getApplicationContext(), "Downloading File", //To notify the Client that the file is being downloaded
Toast.LENGTH_LONG).show();
关于android - 下载管理器在 Android Oreo 中不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52075698/