ImageView knopka1 = (ImageView) findViewById(R.id.imageView);
        ImageView knopka2= (ImageView) findViewById(R.id.imageView2);
        ImageView knopka3= (ImageView) findViewById(R.id.imageView3);
        ImageView knopka4= (ImageView) findViewById(R.id.imageView4);

while (i <= level)
        {
            Random random = new Random();
            int counter = random.nextInt(4)+1;
            String knopka = "knopka"+String.valueOf(counter);
            knopka.performClick();
        }