Android Java file create java.io.FileNotFoundException (File name too long)

Question

I have a small Java code in Android Studio. I run it in emulator (Android 7.1.1 API 25).

How I validate a file name and file name length?

Should I check the length with path name or only file name!

I found Android support 255 character as a file name.

File name text in Language Bengali (UNICODE UTF-8)

File downloadFile = new File("/storage/emulated/0/MyDownload/আমার সোনার বাংলা আমি তোমায় ভালোবাসি চিরদিন তোমার আকাশ তোমার বাতাস আমার প্রাণে বাজায় বাঁশি ও মা ফাগুনে তোর.mp4");
FileOutputStream outputStream = new FileOutputStream(downloadFile, true);

downloadFile.toString().length() // OUTPUT: 142

ERROR: java.io.FileNotFoundException: /storage/emulated/0/MyDownload/আমার সোনার বাংলা আমি তোমায় ভালোবাসি চিরদিন তোমার আকাশ তোমার বাতাস আমার প্রাণে বাজায় বাঁশি ও মা ফাগুনে তোর.mp4 (File name too long)

You do not have access to files in Downloads/ on Android 11+, unless your app is the one that downloaded it. Please consider using the Storage Access Framework (ACTION_OPEN_DOCUMENT / ActivityResultContracts.OpenDocument) instead. — CommonsWare
– CommonsWare, Commented Sep 24, 2022 at 15:09
it has file access File downloadFile = new File("/storage/emulated/0/MyDownload/abcd.mp4"); FileOutputStream outputStream = new FileOutputStream(downloadFile, true); it works and file write is ok — Abhijit
– Abhijit, Commented Sep 24, 2022 at 15:11

ABHIJIT · Accepted Answer · 2022-09-25 20:04:14Z

3

String name = "আমার-সোনার-বাংলা-আমি-তোমায়-ভালোবাসি-চিরদিন-তোমার-আকাশ-তোমার-বাতাস-আমার-প্রাণে-বাজায়-বাঁশি-ও-মা-ফাগুনে-তোর.mp4";
final byte[] utf8Bytes = name.getBytes(StandardCharsets.UTF_8);
if(utf8Bytes.length > 255) {
    name = new String(Arrays.copyOfRange(utf8Bytes, 0, 255), StandardCharsets.UTF_8);
}
System.out.println(name);

answered Sep 25, 2022 at 20:04

ABHIJIT

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2 Comments

Abhijit Over a year ago

It works but it cut the file extension. I will manage it. Thanks anyway @ABHIJIT, at last found a good way. Love you ... ...

ABHIJIT Over a year ago

yes, you just split extension name and cut file name to 255 bytes

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