IssueTracker

The code above should actually be:

            // Write the file
                    OutputStream outputStream = getContentResolver().openOutputStream(currentUri);
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream );


Actually the problem seems to be with ParcelFileDescriptor.AutoCloseOutputStream .  I can get the code above to work fine if I don't use getContentResolver().openOutputStream(currentUri) , which returns a  ParcelFileDescriptor.AutoCloseOutputStream .

If I use:
            // Write the file
                    FileOutputStream fos = new FileOutputStream(new File(getFilesDir(), "out.txt"));
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fos);

it WORKS correctly on any API level.

But as I am using external storage and have to use the ContentProvider given when I get access to the storage via a chooser, all I have to deal with is a content Uri and not a file name nor file handle.  I have to go through the getContentResolver methods.

Note that:

            // Write the file
                    ParcelFileDescriptor pfd = getContentResolver().openFileDescriptor(currentUri, "w");
                    FileDescriptor fd = pfd.getFileDescriptor();
                    FileOutputStream fos = new FileOutputStream(fd);
            OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fos);

Does not work either.  Somewhere in the ParcelFile system things are going wrong.

<Have you observed this bug on Pixel devices as well?> This problem occurs in Android Studio emulators and on a device a friend owns.  By setting the API level on my emulated device I can confirm what happens on my friend's device.

<Android Build Version ?> My friend's phone is on Android 10. Emulators with API 29 and API 30 had the problem.  My own phone and API 26 and API 28 emulators did not.  Project compile SDK is API 30, tools version is 29.0.3.

<Android Device Model ?> My friend's device is a Samsung Galaxy S-10, model SM-G973U.

<If possible, capture the issue in a screen recording (desktop and/or phone capture).> Irrelevant.

<Upload the full bug report file after the issue has occurred> Irrelevant since this was run via emulator.

<Steps to reproduce issue specific to the provided sample project>
1. Copy testCopy.csv from the assets directory onto the phone somewhere or into an API 29 or greater emulator.
2. Start the app , click and choose menu "Open Table..."
3. Choose file "testCopy.csv" with the file chooser.
4. Check the current contents of testCopy.csv now.  It is corrupted.

<Expected Results>

delimiter ,
debug true
Name,Pet,Email,Phone,Audio,Notes,Web
125,100,160,100,100,100,150
12
40
fullname,image,email,phone,audio,note,url
arreter[1],Clipboard01.jpg,lriehl@comcast.net,360-742-3631,sound1407360340825148972.aac,note1.txt,<Name>#https://translate.google.com/?sl=fr&tl=en&text=<Name>&op=translateAnita Axtell,Clipboard02.jpg,bryananderson@comcast.net,253-709-1591,sound421577012195097098.aac,help.html,<Email>#https://www.google.com/search?q=<Email>
Audrey Oakes,Clipboard04.jpg,oakesa@comcast.net,253-639-3558,sound421577012195097098.aac,note3.html#58,Amazon#https://www.amazon.com/
Norm Oakes,Clipboard04.jpg,oakesn@comcast.net,253-639-3558,sound421577012195097098.aac,note2.html#3,https://www.netflix.com

<Observed Results>

delimiter ,
debug true
Name,Pet,Email,Phone,Audio,Notes,Web
125,100,160,100,100,100,150
12
40
fullname,image,email,phone,audio,note,url
arreter[1],Clipboard01.jpg,lriehl@comcast.net,360-742-3631,sound1407360340825148972.aac,note1.txt,<Name>#https://translate.google.com/?sl=fr&tl=en&text=<Name>&op=translateAnita Axtell,Clipboard02.jpg,bryananderson@comcast.net,253-709-1591,sound421577012195097098.aac,help.html,<Email>#https://www.google.com/search?q=<Email>
Audrey Oakes,Clipboard04.jpg,oakesa@comcast.net,253-639-3558,sound421577012195097098.aac,note3.html#58,Amazon#https://www.amazon.com/
Norm Oakes,Clipboard04.jpg,oakesn@comcast.net,253-639-3558,sound421577012195097098.aac,note2.html#3,https://www.netflix.com
flix.com

The error is that "flix.com" is extra.

Sample project is at https://drive.google.com/file/d/1vNOiLrooZHd-A7JOjCudEPBi2oPo1Rge/view?usp=sharing .  Project is in Android Studio 4.0.2.

After opening the table the view will not change.  You must go look back in the file you picked to see that this file is now corrupted.

4. Check the current contents of testCopy.csv now.  It is corrupted.

Check the file contents using an editor outside of Android Studio would be easiest.