How can i cancel running download file?

Question

I want to cancel currently download file from notification area & I want to add cancel button at the bottom of notification download progress. By clicking on that cancel button, download should be cancel. Here is my class DownloadSong using which I perform download file. What modifications I need to do?

public class DownloadSong extends AsyncTask<String, Integer, String> {

Activity activity;
public static String songName, songURL;

private NotificationHelper mNotificationHelper;
public static int notificationID = 1;
boolean download = false;
NotificationManager nm;

public DownloadSong(Activity activity, String songName, String songURL) {
    this.activity = activity;
    this.songName = songName;
    this.songURL = songURL;

    mNotificationHelper = new NotificationHelper(activity, songName);
}

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

    notificationID++;
    mNotificationHelper.createNotification(notificationID);
}

@Override
protected String doInBackground(String... file_URL) {

    try {
        URL url = new URL(songURL);
        HttpURLConnection URLconnection = (HttpURLConnection) url.openConnection();
        URLconnection.setRequestMethod("GET");
        URLconnection.setDoOutput(true);
        URLconnection.connect();

        // Detect the file length
        int fileLength = URLconnection.getContentLength();

        File fSDcard = Environment.getExternalStorageDirectory();
        String strSdcardPath = fSDcard.getAbsolutePath();

        File fDirectory = new File(strSdcardPath + "/GSD");

        if (!fDirectory.exists()) {
            fDirectory.mkdir();
        }

        File fMyFile = new File(fDirectory.getAbsolutePath() + "/" + songName + ".mp3");
        Log.e("Download file name ", fMyFile.toString());

        FileOutputStream out = new FileOutputStream(fMyFile, true);

        InputStream input_File = URLconnection.getInputStream();

        byte[] data = new byte[1024];
        int total = 0;
        int count;

        while ((count = input_File.read(data)) != -1) {

            total += count;
            publishProgress((int) (total * 100 / fileLength));

            out.write(data, 0, count);
        }

        out.flush();
        out.close();
        input_File.close();

    } catch (IOException e) {

        Log.e("Download Error : ", "Failed");

    }
    Log.e("Download status", " Complete ");

    return null;
}

@Override
protected void onPostExecute(String s) {
    Toast.makeText(activity, "Song " + "'" + songName + "'" + " downloaded successfully", Toast.LENGTH_LONG).show();
    //pDialog.dismiss();

    if (download) {
        Toast.makeText(activity, "Could Not Connect to Server.", Toast.LENGTH_LONG).show();
        mNotificationHelper.clearNotification();
    } else
        mNotificationHelper.completed();
}

@Override
protected void onProgressUpdate(Integer... progress) {
    //pDialog.setProgress(progress[0]);

    mNotificationHelper.progressUpdate(progress[0]);

    super.onProgressUpdate(progress);
}
}

score 2 · Accepted Answer · answered Jun 23 '16 at 05:08

2

Most of the time is spent in the loop

while ((count = input_File.read(data)) != -1) {

     total += count;
     publishProgress((int) (total * 100 / fileLength));

     out.write(data, 0, count);
}

You can add a check to see if the task is cancelled,

while ((count = input_File.read(data)) != -1 && !isCancelled()) {

     total += count;
     publishProgress((int) (total * 100 / fileLength));

     out.write(data, 0, count);
}

and cancel the download by calling

yourAsyncTask.cancel()

answered Jun 23 '16 at 05:08

Anuj

1,912
1
12
19

But how can i add "cancel button" to notification ? – Urvashi Patel Jun 23 '16 at 05:11
Read here all the 3 types of Notification. http://www.androidwarriors.com/2016/05/android-notification-example-android.html – Avinash Verma Jun 23 '16 at 05:15
Yes, it works fine for adding button to notification. – Urvashi Patel Jun 23 '16 at 07:28

score 0 · Answer 2 · answered Jun 23 '16 at 05:10

0

You can cancel asynctask forcefully

Check This

declare your asyncTask in your activity:

private YourAsyncTask mTask;

instantiate it like this:

mTask = new YourAsyncTask().execute();

kill/cancel it like this:

mTask.cancel(true);

answered Jun 23 '16 at 05:10

Sachin

1,307
13
23

How can i cancel running download file?

2 Answers2