Android Java.io.FileNotFoundException when trying to download and save a video

Question

I'm trying to develop an app which provides many movies and you can play it or download the movie.

That app works fine in my rooted Galaxy S4 (Kitkat API:19), but when I install it on another device and try to download the movie it gives my the exception Java.io.FileNotFoundException, I don't know what's the problem

That's my code

package nmc.net.blue.bluenet_nmc;

import android.content.Context;
import android.os.AsyncTask;
import android.os.Environment;
import android.util.Log;
import android.widget.Toast;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.net.URL;
import java.net.URLConnection;

/**
 * Created by ElHoni on 5/3/2016.
 */
public class DownloadFileAsync extends AsyncTask<String, String, String> {



    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected String doInBackground(String... aurl) {
        int count;

        try {
            URL url = new URL(aurl[0]);
            URLConnection conexion = url.openConnection();
            conexion.connect();

            File folder = new File(Environment.getExternalStorageDirectory() +
                    File.separator + "BlueNet");

            if (!folder.exists()) {
                folder.mkdirs();
            }


            String outputPath=folder.getPath()+"/"+aurl[1];

            BufferedInputStream input = new BufferedInputStream(url.openStream());
            FileOutputStream output = new FileOutputStream(outputPath);

            byte data[] = new byte[1024];

            long total = 0;

            while ((count = input.read(data, 0, 1024)) != -1) {
                output.write(data, 0, count);

            }

            output.flush();
            output.close();
            input.close();
        } catch (Exception e) {
            String err = e.toString();

        }
        return null;

    }
    protected void onProgressUpdate(String... progress) {
        Log.d("ANDRO_ASYNC",progress[0]);
    }

    @Override
    protected void onPostExecute(String unused) {

        //Toast.makeText(full_screen_video.this, "", 5);

    }

}

and by the way i put this permissions in manufests

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

any help please

You should use `DownloadManager` instead of your approach. – Grender May 05 '16 at 16:18 — Grender, May 05 '16 at 16:18

Grender · Accepted Answer · 2016-05-05T23:42:19.203

1

As I said, you should use DownloadManager for what you want.

Here is a method which downloads a file from a given URL.

public static void downloadFileFromUrl(String url, String dir, String fileName, DownloadManager downloadManager) {
    Uri downloadUri = Uri.parse(url);
    DownloadManager.Request request = new DownloadManager.Request(downloadUri);

    request.setDestinationInExternalPublicDir(dir, fileName);
    request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
    request.setVisibleInDownloadsUi(true);
    downloadManager.enqueue(request);
}

Instantiate DownloadManager like this:

DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);

Remember to add WRITE_PERMISSION and INTERNET_PERMISSION and don't forget that in Android M or newer you should check the permissions in a different way.

edited May 05 '16 at 23:42

answered May 05 '16 at 16:26

Grender

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unfortunately it still didnt work i create the method and i call it from the button Listener – M.Honi May 05 '16 at 17:17
Can you post your full logcat log? – Grender May 05 '16 at 17:18
please describe the argument uri=uri of what? path=path of what? filename: is the file i want to download or where i want to download on my device?? – M.Honi May 05 '16 at 17:32
The URL of the file you want to download, the path (folder under the SD card, ex: Pictures, Downloads... ) and the name of the file you want to store. – Grender May 05 '16 at 17:34
the code doesn't work, it doesn't give any error but it don't download the file too – M.Honi May 05 '16 at 18:56
It does work, I have tested it in my app. Can you post how are u calling it? – Grender May 05 '16 at 19:00
or see it here that's how i call it DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE); downloadFileFromUrl(path, fileName, downloadManager); – M.Honi May 05 '16 at 19:20
i said that your answer is ok because it near from true, but still not work :) – M.Honi May 05 '16 at 19:43
I want to see the content of your `url, path and fileName` variables. – Grender May 05 '16 at 19:50
url="192.168.1.5:8080/BlueNet_NMCvideoShare/blue_elephant.mp4"; path=Environment.getExternalStorageDirectory() + File.separator + "BlueNet"; fileName=blue_elephant.mp4 – M.Honi May 05 '16 at 20:34
@M.Honi `path` must be only "/BlueNet" as `request.setDestinationInExternalPublicDir(path, fileName);` already sets the destination to the external SD card plus the dir you pass. (Maybe I've should called the variable `dir` instead of `path`, I'm gonna edit it. – Grender May 05 '16 at 23:41
ok, i wanna try this solution and if it doesn't work I'll wait you while you edit your answer – M.Honi May 06 '16 at 09:15
still not working, it doesn't give any error but not download any thing :( i put break point to see what happened exactly but I found nothing – M.Honi May 06 '16 at 09:24
I can't help you more without knowing more about your app's code, the problem is not in the download method. – Grender May 06 '16 at 15:21
so, what do you suggest? do you want me to send you the the whole main activity? if you so, give me your email cause i can't send it here – M.Honi May 06 '16 at 16:13
You can upload the important files to some website and post the link here, so I can check it out more effusively. – Grender May 06 '16 at 16:17
what file do you need? – M.Honi May 06 '16 at 16:24
Activities and/or fragments where you call the download method, manifest, the app gradle file and helper classes (if you are using them) – Grender May 06 '16 at 16:34
it's only main activity i'll post it here as an answer ok? – M.Honi May 06 '16 at 16:43
i can't edit my question because now i'm using donload manager – M.Honi May 06 '16 at 16:58
So, have you posted it anywhere? – Grender May 06 '16 at 22:48
i post it in new question here http://stackoverflow.com/questions/37082354/android-download-manager-not-working – M.Honi May 06 '16 at 22:53

Android Java.io.FileNotFoundException when trying to download and save a video

1 Answers1