CODEWITHSUNDEEP
javaandroid
Psyonic
Psyonic

Reputation: 195

Waiting untill a downloaded file is complete, not just File.exists()

I am downloading a file from the net and then reading it using a BufferedReader. Currently I download the file using DownloadManager then have this code :

while (latestNumbersFile.exists() != true) {
            System.out.println("WAITING...");
        }

        try {
            Thread.sleep(5000);
        } catch (InterruptedException ignored) {
        }

So that any following code does not execute until the file has finished downloading. This works but seams really dirty to me. If I remove the Thread.sleep(5000); it seams that the file does indeed exist but is not quite ready to be read.

There has to be a better way of recognizing when a file not only exists but is actually complete and ready to have something preformed on it.

Any thoughts?? (sorry if this is a noobie question, I've searched high and low for an answer)

Upvotes: 3

Views: 2248

Answers (2)

ThomasEdwin
ThomasEdwin

Reputation: 2145

Busy-waiting is not recomended. You'd better use DownloadManager.

From Download a file with Android, and showing the progress in a ProgressDialog :

Use DownloadManager class (GingerBread and newer only) This method is awesome, you do not have to worry about downloading the file manually, handle threads, streams, etc. GingerBread brought a new feature: DownloadManager which allows you to download files easily and delegate the hard work to the system.

Upvotes: 0

Sherekan
Sherekan

Reputation: 536

From Android developers when download completes, DownloadManager broadcasts an intent. You can capture this "event" and handle it like:

BroadcastReceiver receiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (DownloadManager.ACTION_DOWNLOAD_COMPLETE.equals(action)) {


             /** Do your coding here **/       

            }
        }
    };

    registerReceiver(receiver, new IntentFilter(
            DownloadManager.ACTION_DOWNLOAD_COMPLETE));

Source from: Vogella

Please let me know if this helps you, if it doesn't we can try anything else :)

Upvotes: 4

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