I have read several forums and examples on using invalidate() in order to update views immediately but I still do not understand why what I am doing will not work. The code below uses image buttons defined by "red", "blue", "green", and "yellow". I set a 1 second delay between each time I try and change a button's appearance. Please someone tell me what i'm doing wrong.

private void showPattern() {
    if (correct == true) {
        for (int k = 0; k < temp_basket.length; k++) {
            if (temp_basket[k] == 0) {
                red.setPressed(true);
                red.invalidate();
                final Handler handler = new Handler();
                Timer t = new Timer();
                t.schedule(new TimerTask() {
                    public void run() {
                        handler.post(new Runnable() {
                            public void run() {
                                red.setPressed(false);
                                red.invalidate();
                            }
                        });
                    }
                }, 1000);

There are 3 more or these blocks after this one that are blue, green, and yellow.