使用java.nio时抛出IllegalArgumentException

Question

Trying to download file by url. For that using java.nio library. The code above work perfect for sdk 24 and above but getting IllegalArgumentException for android sdk 23 and below. I'm getting the error when trying transfer the data. Dear Friends can you please clarify which is the problem.

    private void downloadFile(final String itemUrl) {
        new Thread(new Runnable() {
            @Override
            public void run() {

                ReadableByteChannel readableByteChannel = null;
                FileOutputStream fOutStream = null;

                String root = 
                getApplicationContext().getApplicationInfo().dataDir;
                File myDir = new File(root + "/downloadedSongs");
                if (!myDir.exists()) {
                myDir.mkdirs();
                }

                File file = new File(myDir, itemTitle);
                if (file.exists()) {
                    file.delete();
                }

                try {
                    URL url = new URL(itemUrl);
                    readableByteChannel = 
                    Channels.newChannel(url.openStream());
                    fOutStream = new FileOutputStream(file);
      fOutStream.getChannel().transferFrom(readableByteChannel, 0, Long.MAX_VALUE);

                } catch (IOException e) {
                    orderAction = Enums.OrderAction.Delete;
                } catch (IllegalArgumentException e) {
                    orderAction = Enums.OrderAction.Delete;
                    Crashlytics.logException(e);
                } finally {
                    try {
                        if (fOutStream != null) {
                            fOutStream.close();
                        }
                        if (readableByteChannel != null) {
                           readableByteChannel.close();
                        }
                    } catch (IOException ioExObj) {
                        orderAction = Enums.OrderAction.Delete;
                    }
                    closeNotification(orderAction);
                }
            }
    }).start();
}

Fatal Exception: java.lang.IllegalArgumentException: position=0 count=9223372036854775807 at java.nio.FileChannelImpl.transferFrom(FileChannelImpl.java:370) at am.itsoft.youtomp3.services.DnlService$1.run(DnlService.java:169) at java.lang.Thread.run(Thread.java:818)

Answer 1

The reason is in this argument: Long.MAX_VALUE

Right code:

FileChannel destChannel = fOutStream.getChannel();
long blockSize;
if (Build.VERSION.SDK_INT > 23) {
  long blockSize = Long.MAX_VALUE;
} else {
  long blockSize = 8*1024;
}
long position = 0;
long loaded;
while ((loaded = destChannel.transferFrom(readableByteChannel, position, blockSize)) > 0) {
   position += loaded;
}