progressbar.java

progressBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {       

    @Override       
    public void onStopTrackingTouch(SeekBar seekBar) {      
        // Quando alguem acaba a interagir com a PB    
    }       

    @Override       
    public void onStartTrackingTouch(SeekBar seekBar) {     
        // Quando alguem comeca de interagir com a PB      
    }       

    @Override       
    public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {     
        // O intermedio da interaccao
    }       
});