ProgressBar - Java logika

    Button btnUvecajProgress;
    ProgressDialog progressBar;
    private int progressBarStatus = 0;
    private Handler progressBarHandler = new Handler();


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        addListenerOnButton();

    }

    public void addListenerOnButton() {

        btnUvecajProgress = (Button) findViewById(R.id.btnUvecajProgress);
        progressBar = new ProgressDialog(MainActivity.this);

        progressBar.setMessage("File downloading ...");
        progressBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        progressBar.setProgress(0);
        progressBar.setMax(100);
        progressBar.setCancelable(true);
        progressBar.show();

        btnUvecajProgress.setOnClickListener(
                 new OnClickListener() {

           @Override
           public void onClick(View v) {

            if(progressBarStatus >= 100)    {
                progressBarStatus = 0;
            } else {
                progressBarStatus++;
            }
            // napredujemo!
            progressBar.setProgress(progressBarStatus);


               }

                });

        }