static int progress;
    ProgressBar progressBar;
    int progressStatus = 0;
    Handler handler = new Handler();

//u onCreate:

      progress = 0;
        progressBar = (ProgressBar) findViewById(R.id.progressbar);
        progressBar.setMax(200);
        
        //---do some work in background thread---
        new Thread(new Runnable()
        {
            public void run()
            {
                //-do some work here-
                while (progressStatus < 100)
                {
                    progressStatus = doSomeWork();

                    //-Update the progress bar-
                    handler.post(new Runnable()
                    {
                        public void run() {
                            progressBar.setProgress(progressStatus);
                        }
                    });
                }

                //---hides the progress bar---
                handler.post(new Runnable()
                {
                    public void run()
                    {
                        //---0 - VISIBLE; 4 - INVISIBLE; 8 - GONE---
                        progressBar.setVisibility(View.GONE);
                    }
                });
            }

            //---do some long running work here---
            private int doSomeWork() 
            {
                try {
                    //---simulate doing some work---
                    Thread.sleep(50);
                } catch (InterruptedException e)
                {
                    e.printStackTrace();
                }
                return ++progress;
            }
        }).start();