private void displayColors(final int quantity) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            delta=0;
            final ImageView[] displayingColors = new ImageView[quantity];
            final RelativeLayout.LayoutParams displayingColorsLayoutParams[] = new RelativeLayout.LayoutParams[k];
            for (int count = 0; count < quantity; count++) {
                displayingColors[count] = new ImageView(getApplicationContext());
                displayingColorsLayoutParams[count] = new RelativeLayout.LayoutParams(height, width);
                displayingColorsLayoutParams[count].setMargins(marginLeft, marginTop, 0, 0);
            }
            for (int count = 0; count < quantity; count++) {
                final int index = count;
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        displayingColors[index].setImageResource(a random image);
                        gameBoard.addView(displayingColors[index], displayingColorsLayoutParams[index]); //colors appearing
                        if (index >= 1)
                            colorsGameBoard.removeView(displayingColors[index - 1]); //colors disappearing
                    }
                }, 1000 * (index + 1));
            }
            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    colorsGameBoard.removeView(displayingColors[colorsNumber - 1]);
                    chooseColorsFromList(colorsNumber);
                    delta=100;
                    }
                }, 1000 * (k + 1));
            }
        });
    }

private class CheckTime implements Runnable {

        @Override
        public void run() {
            while (timeAmount > 0) {
                try {
                    Thread.sleep(100);
                    timeAmount = timeAmount - delta;
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            if (timeAmount <= 0)
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        //Game Over UI process
                    }
                });
        }
    }