I am trying to download a file using the DownloadManager
class.
public void downloadFile(View view) {
String urlString = "your_url_here";
try {
// Get file name from the url
String fileName = urlString.substring(urlString.lastIndexOf("/") + 1);
// Create Download Request object
DownloadManager.Request request = new DownloadManager.Request(Uri.parse((urlString)));
// Display download progress and status message in notification bar
request.setNotificationVisibility(Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
// Set description to display in notification
request.setDescription("Download " + fileName + " from " + urlString);
// Set title
request.setTitle("DownloadManager");
// Set destination location for the downloaded file
request.setDestinationUri(Uri.parse("file://" + Environment.getExternalStorageDirectory() + "/" + fileName));
// Download the file if the Download manager is ready
did = dManager.enqueue(request);
} catch (Exception e) {
}
}
// BroadcastReceiver to receive intent broadcast by DownloadManager
private BroadcastReceiver downloadReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context arg0, Intent arg1) {
// TODO Auto-generated method stub
Query q = new Query();
q.setFilterById(did);
Cursor cursor = dManager.query(q);
if (cursor.moveToFirst()) {
String message = "";
int status = cursor.getInt(cursor.getColumnIndex(DownloadManager.COLUMN_STATUS));
if (status == DownloadManager.STATUS_SUCCESSFUL) {
message = "Download successful";
} else if (status == DownloadManager.STATUS_FAILED) {
message = "Download failed";
}
tvMessage.setText(message);
}
}
};
I am using dexter
to obtain permissions
Dexter.withActivity(this)
.withPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
.withListener(new PermissionListener() {
@Override
public void onPermissionGranted(PermissionGrantedResponse response) {
I also have both in my manifest
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
But I still get this error while trying to download files (ONLY on Oreo). It works on android 7
No permission to write to /storage/emulated/0/download: Neither user 10205 nor current process has android.permission.WRITE_EXTERNAL_STORAGE.
You only need internet permission.
<uses-permission android:name="android.permission.INTERNET" />
and
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
if you want to store and read this downloaded file.
The internet permission is required:
<uses-permission android:name="android.permission.INTERNET" />
You can use getExternalFilesDir
if you want to save file without any storage permission.
As stated in the documentation:
getExternalFilesDir
Added in
API level 8
File getExternalFilesDir (String type)
Returns the absolute path to the directory on the primary shared/external storage device where the application can place persistent files it owns. These files are internal to the applications, and not typically visible to the user as media.
This is like
getFilesDir()
in that these files will be deleted when the application is uninstalled, however there are some important differences: Shared storage may not always be available, since removable media can be ejected by the user. Media state can be checked usinggetExternalStorageState(File)
. There is no security enforced with these files. For example, any application holdingWRITE_EXTERNAL_STORAGE
can write to these files.If a shared storage device is emulated (as determined by
isExternalStorageEmulated(File)
), it's contents are backed by a private user data partition, which means there is little benefit to storing data here instead of the private directories returned bygetFilesDir()
, etc.Starting in KITKAT, no permissions are required to read or write to the returned path; it's always accessible to the calling app. This only applies to paths generated for package name of the calling application.
To access paths belonging to other packages,
WRITE_EXTERNAL_STORAGE
and/orREAD_EXTERNAL_STORAGE
are required. On devices with multiple users (as described byUserManager
), each user has their own isolated shared storage. Applications only have access to the shared storage for the user they're running as.The returned path may change over time if different shared storage media is inserted, so only relative paths should be persisted.
https://developer.android.com/reference/android/content/Context#getExternalFilesDir(java.lang.String)
This link may be useful:
Save files on device storage
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