问如何获取下载文件的剩余时长

EN

public class MainActivity extends AppCompatActivity {




    // button to show progress Dialog
    Button btnShowProgress;

    // progress dialog
    ProgressDialog proDaiog;


    //File url to download
    private static String url = "http://rvo/file/Ardu_Vid.mp4";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        // show progress bar button
        btnShowProgress = (Button) findViewById(R.id.button);

        btnShowProgress.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new DownloadFile().execute(url);
                //   running = true;
                //   runTimer();

            }
        });

    } // end onCreate

    private class DownloadFile extends AsyncTask<String, Integer, String> {

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

            proDaiog = new ProgressDialog(MainActivity.this);

            //Set progress dialog title
            proDaiog.setTitle("Downloading...");

            //set progress dialog message
            proDaiog.setMessage("");
            proDaiog.setIndeterminate(false);
            proDaiog.setMax(100);
            proDaiog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);


            proDaiog.show();

        }


        @Override
        protected String doInBackground(String... Url) {
            try {
                URL url = new URL(Url[0]);
                URLConnection connection = url.openConnection();
                connection.connect();

                //Detect File Length
                int fileLength = connection.getContentLength();

                //Locate Storage Location
                String filePath = Environment.getExternalStorageDirectory().getPath();

                //Downloading File
                InputStream input = new BufferedInputStream(url.openStream());

                //Save the Download File
                OutputStream output = new FileOutputStream(filePath + "/" + "Ardu_Vid.mp4");

                byte data[] = new byte[fileLength];
                long total = 0;
                int count;
                int s = 1;
                //  Long startTime = System.nanoTime();
                //  Log.e("Time-",""+startTime);
//                Long elapsedTime = System.nanoTime() - startTime;
                int sec = 0;

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

                    long Start_Timee = System.currentTimeMillis();

                    //long seconds = TimeUnit.MILLISECONDS.toSeconds(Start_Timee);


                    total += count;
                    output.write(data, 0, count);

                    //publish the progress
                    publishProgress((int) (total * 100 / fileLength));

                /************ Get Duration of Downloading ***************/

                    Long End_Timee = System.currentTimeMillis();
                    Log.e("Time_End", "" + End_Timee);

                    long seccc = (End_Timee - Start_Timee);
                    Log.e("estimate ",""+seccc);

                    int seconds = (int) (seccc / 1000) % 60 ;
                    int minutes = (int) ((seccc / (1000*60)) % 60);
                    Log.e("elapse",""+minutes+":"+seconds);



                }// end while

                //close connection
                output.flush();
                output.close();
                input.close();

            } catch (Exception e) {
                Log.e("Error", e.getMessage());
                e.printStackTrace();
            }

            return null;
        }

        @Override
        protected void onProgressUpdate(Integer... progress) {
            super.onProgressUpdate(progress);
            proDaiog.setProgress(progress[0].intValue());
            Log.i("proDaiog.setProgress", "" + progress[0]);
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            proDaiog.dismiss();
        }
    } // end Asyc