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javaandroidfilesystemsandroid-file

Android - Power off after files are copied results in corrupted files

I'm using this code

for (Uri fileUri : files) {
  File destFile = ...
  InputStream is = getContentResolver().openInputStream(fileUri);

  FileUtils.copyInputStreamToFile(is, destFile);
}

And if user remove the battery of the phone after this for cycle then the some files (lasts) are corrupted.

Is it possible to prevent this?

I tried copy the InputStream to the temp directory and then use

 FileUtils.moveFile(temp, destFile);

for each file but there was the same problem.

Can I somehow close the copied files? Make sure they are copied successfully?

Solution

  • I solved this issue by using this:

    FileOutputStream out = new FileOutputStream(filename);

[...]

out.flush();
out.getFD().sync();

    from I/O concept flush vs sync

    Look at the https://android.googlesource.com/platform/frameworks/base/+/cd92588/core/java/android/os/FileUtils.java and method copyToFile(InputStream inputStream, File destFile) It's nice example how to sole this.

    Thanks to qbix!