CODEWITHSUNDEEP
androidurlfilesizedownload
Kenneth Ngedo
Kenneth Ngedo

Reputation: 95

File size from URL not the same as download file in storage

I am trying to download a file from a URL using an Asynctask. In the doInBackground() method, I retrieve the file size, like this.

    lenghtOfFile = conection.getContentLength();

This returns an integer value. Now, the download continues and file is completely downloaded and written to sdcard.

The problem is that in my postExecute() I want to compare the size of the file from the URL and the size of the file downloaded.

    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);

        //check if the file was download and know how much of it
        //was downloaded, so as to update ui accordingly
        if(file.exists()){

            Log.e("apiFileSize", String.valueOf(lenghtOfFile));
            Log.e("downloadFileSize", String.valueOf(file.length()));

            //check if the file was completely downloaded
            if(lenghtOfFile == file.length()){
                     ....

As you can see I log both values, but they are not equal even though the download ran to its end and the file was fully downloaded. The file from local storage(sdcard) ends up being greater than the file size from the url. I expect them to be equal, why is this happening? what can I do?

Below is the log result.

09-23 22:44:48.203  26594-26594/com.mobile.soullounge E/apiFileSize﹕ 1298573 
09-23 22:44:48.204  26594-26594/com.mobile.soullounge E/downloadedFileSize﹕ 2696392

Thanks in advance.

Upvotes: 1

Views: 246

Answers (1)

Adam Fręśko
Adam Fręśko

Reputation: 1064

Iv assumed that you are using HttpURLConnection

By default, this implementation of HttpURLConnection requests that servers use gzip compression and it automatically decompresses the data for callers of getInputStream(). Therafore getContentLength() cannot be used to determine size of file.

But! You can disable compression like this: 

urlConnection.setRequestProperty("Accept-Encoding", "identity");

Your server should also be set to properly handle such case.

Upvotes: 1

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