Download PDF using AsyncTask.

Hi all here i'm introducing new simple example how to download PDF file with AsyncTask, in this example you get idea how to download file, If you already downloaded  it will ask view of the article with respect pdf viewers.

DownloadFileAsync.java

call this method where ever we want

new DownloadFileAsync(this).execute();

public class DownloadFileAsync extends AsyncTask<String, Integer, Integer> {
    private Context mContext;
    private ProgressDialog mProgressDialog;
    private NotificationManager mNotifyManager;
    private NotificationCompat.Builder build;
    int id = 1;
    private File existingfile;
    private Uri pathUri;

    public DownloadFileAsync(Context context) {
        this.mContext = context;
        pathUri = Uri.parse("file:///" + Environment.getExternalStorageDirectory().getPath() + "/download/"+ArticleTitle+".pdf");
        existingfile = new File((Environment.getExternalStorageDirectory().getPath() + "/download/"+ArticleTitle+".pdf"));
        if (!existingfile.exists()) {
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setDataAndType(pathUri, "application/pdf");
            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
            PendingIntent pendingIntent = PendingIntent.getActivity(mContext, 0, intent, 0);
            mNotifyManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
            build = new NotificationCompat.Builder(mContext);
            build.setContentTitle("Download").setContentText("Download in progress")
                    .setSmallIcon(R.mipmap.ic_launcher).setPriority(NotificationCompat.PRIORITY_DEFAULT)
                    // Set the intent that will fire when the user taps the notification                    .setContentIntent(pendingIntent).setAutoCancel(true);
        } else {
            Intent i = new Intent(Intent.ACTION_VIEW);
            i.setDataAndType(pathUri, "application/pdf");
            mContext.startActivity(i);
        }
    }

    @Override    protected void onPreExecute() {
        super.onPreExecute();
        if (!existingfile.exists()) {
            mProgressDialog = ProgressDialog.show(mContext, "", "please wait.....");
            build.setProgress(100, 0, false);
            mNotifyManager.notify(id, build.build());
        }
    }

    @Override    protected Integer doInBackground(String... aurl) {
        if (!existingfile.exists()) {
            mProgressDialog.show();

            int count;
            try {
                URL url = new URL(PDFURL);
                URLConnection conection = url.openConnection();
                conection.connect();
                // getting file length                int lenghtOfFile = conection.getContentLength();
                // input stream to read file - with 8k buffer                InputStream input = new BufferedInputStream(url.openStream(), 8192);
                // Output stream to write file                OutputStream output = new FileOutputStream(Environment.getExternalStorageDirectory().getPath() + "/download/"+ArticleTitle+".pdf");

                byte data[] = new byte[1024];
                long total = 0;
                while ((count = input.read(data)) != -1) {
                    //total += count;                    output.write(data, 0, count);
                }
                output.flush();
                output.close();
                input.close();

            } catch (Exception e) {
                Log.e("Error: ", e.getMessage());
            }
            int i;
            for (i = 0; i <= 100; i += 5) {
                // Sets the progress indicator completion percentage                publishProgress(Math.min(i, 100));
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    Log.d("Failure", "sleeping failure");
                }
            }
        }
        return null;
    }

    protected void onProgressUpdate(Integer... progress) {
        if (!existingfile.exists()) {
            build.setProgress(100, progress[0], false);
            mNotifyManager.notify(id, build.build());
            super.onProgressUpdate(progress);
        }
    }

    @Override    protected void onPostExecute(Integer unused) {
        if (mProgressDialog != null && mProgressDialog.isShowing()) {
            mProgressDialog.dismiss();
            build.setContentText("Download complete");
            // Removes the progress bar            build.setProgress(0, 0, false);
            mNotifyManager.notify(id, build.build());
            super.onPostExecute(unused);
        }
    }
}