When writing using an OutputFileStream causes the file to contain extra data after the expected data, usually some part of the input data to the stream. At first I was using it with a non-default CharSet but via testing I found it happens with the default CharSet as well.

InputStream myInput = getContentResolver().openInputStream(currentUri);
InputStreamReader isr1 = new InputStreamReader(myInput);
isr = new BufferedReader(isr1);

StringBuffer vals = new StringBuffer();

String str = isr.readLine();
while(str != null)
{
vals.append(str).append("\n");
str = isr.readLine();
}

if (myInput != null)
myInput.close();

// Write the file
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(os);

outputStreamWriter.write(vals.toString());
os.flush(); // I was told this was required. Problem occurs w or w/o this line.
outputStreamWriter.close();

Input file:

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

Output:

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 "flix.com" should not be there. Sometimes with larger files I get 4 extra lines, sometimes one or more lines will be truncated in the middle of the file.

I really want to use OutputStreamWriter with a CharSet of ISO-8859-1.

This happens in API 29 and higher. This code works fine with API 29 and API 26.

Issue 176124891

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