java.lang.NullPointerException: uri

[claptv]

Getting a null pointer exception from ContentResolver.openAssetFileDescriptor method. I can reproduce this problem with certain files most of times.

I was running the app on SamSung S9 Plus.

at com.android.internal.util.Preconditions.checkNotNull(Preconditions.java:133)
at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:1484)
at android.content.ContentResolver.openOutputStream(ContentResolver.java:1234)
at vn.hunghd.flutterdownloader.DownloadWorker.downloadFile(DownloadWorker.java:358)
at vn.hunghd.flutterdownloader.DownloadWorker.doWork(DownloadWorker.java:208)

addFileToDownloadsApi29 method seems to return a valid uri; however, openOutputStream(uriApi29, "w") method at DownloadWorker.java:358 is causing this problem.

[Updated] I found that ContentResolver.insert fails because the same file already exists. I called File.exists before creating a new DownloadTask, but it didn't find the same file. So I added the code below to check for the same file before inserting a new row.

// Check if the same file already exists
String strId = "";
String[] projection = {"_id", "_display_name"};
Cursor cursor = contentResolver.query(
collection,
projection,
null,
null,
null);
if (cursor.moveToFirst()) {
do {
strId = cursor.getString(cursor.getColumnIndex("_id"));
String displayName = cursor.getString(cursor.getColumnIndex("_display_name"));
log("[" + strId + "] " + displayName);
if (displayName.equals(filename)) {
log("Same file found.");
Uri uri = Uri.parse(collection.toString() +
File.separator + strId);
return uri;
}
} while (cursor.moveToNext());
cursor.close();
}

---

outputStream = context.getContentResolver().openOutputStream(uriApi29, "w");

I can access to the image with the HTTP Url with no problem.

Here is the log:

I/System.out(14329): (HTTPLog)-Static: isSBSettingEnabled false
I/System.out(14329): (HTTPLog)-Static: isSBSettingEnabled false
D/DownloadWorker(14329): Content-Type = image/png
D/DownloadWorker(14329): Content-Length = 906615
D/DownloadWorker(14329): Charset = null
D/DownloadWorker(14329): fileName = Pursue Spray .png
D/DownloadWorker(14329): Update notification: {notificationId: 33, title: Pursue Spray .png, status: 4, progress: -1}
W/System.err(14329): java.lang.NullPointerException: uri
W/System.err(14329): at com.android.internal.util.Preconditions.checkNotNull(Preconditions.java:133)
W/System.err(14329): at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:1484)
W/System.err(14329): at android.content.ContentResolver.openOutputStream(ContentResolver.java:1234)
W/System.err(14329): at vn.hunghd.flutterdownloader.DownloadWorker.downloadFile(DownloadWorker.java:358)
W/System.err(14329): at vn.hunghd.flutterdownloader.DownloadWorker.doWork(DownloadWorker.java:208)
W/System.err(14329): at androidx.work.Worker$1.run(Worker.java:85)
W/System.err(14329): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
W/System.err(14329): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
W/System.err(14329): at java.lang.Thread.run(Thread.java:919)
I/WM-WorkerWrapper(14329): Worker result FAILURE for Work [ id=543e7685-40e8-4b7d-9848-cd27f6399210, tags={ flutter_download_task, vn.hunghd.flutterdownloader.DownloadWorker } ]
D/ConnectivityManager(14329): unregisterNetworkCallback; CallingUid : 10918, CallingPid : 14329

[AadneEM]

I'm having this same issue, but the file doesn't already exist. Other than that it's identical except for the file type being PDF.

It worked fine before, even if the file existed. Then it saved the file as {filename}.pdf (n) where n is a integer increasing by one for each file.

Device: OnePlus 7 Por
OS: Android 10

D/DownloadWorker( 8515): DownloadWorker{url=[url],filename=null,savedDir=/storage/emulated/0/Documents,header={[headers]},isResume=false
D/DownloadWorker( 8515): Update notification: {notificationId: 1, title: [url], status: 2, progress: 0}
D/DownloadWorker( 8515): Open connection to [url]
D/DownloadWorker( 8515): Headers = {[headers]}
D/DownloadWorker( 8515): Content-Type = application/pdf
D/DownloadWorker( 8515): Content-Length = 268150
D/DownloadWorker( 8515): Charset = null
D/DownloadWorker( 8515): Content-Disposition = attachment; filename=10199.pdf
D/DownloadWorker( 8515): fileName = 10199.pdf
D/DownloadWorker( 8515): Update notification: {notificationId: 1, title: [url], status: 4, progress: -1}
W/System.err( 8515): java.lang.NullPointerException: uri
W/System.err( 8515): 	at com.android.internal.util.Preconditions.checkNotNull(Preconditions.java:133)
W/System.err( 8515): 	at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:1495)
W/System.err( 8515): 	at android.content.ContentResolver.openOutputStream(ContentResolver.java:1245)
W/System.err( 8515): 	at vn.hunghd.flutterdownloader.DownloadWorker.downloadFile(DownloadWorker.java:358)
W/System.err( 8515): 	at vn.hunghd.flutterdownloader.DownloadWorker.doWork(DownloadWorker.java:208)
W/System.err( 8515): 	at androidx.work.Worker$1.run(Worker.java:85)
W/System.err( 8515): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
W/System.err( 8515): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
W/System.err( 8515): 	at java.lang.Thread.run(Thread.java:919)
I/WM-WorkerWrapper( 8515): Worker result FAILURE for Work [ id=400bf5de-a30d-4c38-9a5c-7696a8dfc6ed, tags={ flutter_download_task, vn.hunghd.flutterdownloader.DownloadWorker } ]

PS:
For the file name mentioned above, shouldn't the (n) part be before the file extension? When it's after it makes the OS not recognize which file type is it.

[bugrevealingbme]

Same as

[hnvn]

Duplicate of #548