ProgressBar - Java logika - THREAD

public void addListenerOnButton() {

        btnUvecajProgress = (Button) findViewById(R.id.btnUvecajProgress);
        btnUvecajProgress.setOnClickListener(
                 new OnClickListener() {

           @Override
           public void onClick(View v) {

            // prepare for a progress bar dialog
            progressBar = new ProgressDialog(MainActivity.this);
            progressBar.setCancelable(true);
            progressBar.setMessage("File downloading ...");
            progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            progressBar.setProgress(0);
            progressBar.setMax(100);
            progressBar.show();

            //reset progress bar status
            progressBarStatus = 0;


            new Thread(new Runnable() {
              public void run() {
                while (progressBarStatus < 100) {

                  // process some tasks
                  progressBarStatus+= 10;

                  // your computer is too fast, sleep 1 second
                  try {
                    Thread.sleep(1000);
                  } catch (InterruptedException e) {
                    e.printStackTrace();
                  }

                  // Update the progress bar
                                  // HANDLER!
                  progressBarHandler.post(new Runnable() {
                    public void run() {
                      progressBar.setProgress(progressBarStatus);
                    }
                  });
                }

                // ok, file is downloaded,
                if (progressBarStatus >= 100) {

                    // sleep 2 seconds, so that you can see the 100%
                    try {
                        Thread.sleep(2000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }

                    // close the progress bar dialog
                    progressBar.dismiss();
                }
              }
               }).start();

               }

                });

        }