autoChangeColor2.java

public static void autoChangeColors(final ImageView bg, int time, final int[] colors) {

    final int size = colors.length;
    final long milltime = time * 1000;

    final Handler handler = new Handler() {
        int count = 0;
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case 1:
                    bg.setBackgroundColor(colors[count]);
                    count = (count + 1) % size;
                    break;
            }
            super.handleMessage(msg);
        }
    };

    Thread timer = new Thread(new Runnable() {
        @Override
        public void run() {
            while (true) {
                Message m = new Message();
                m.what = 1;
                handler.sendMessage(m);
                try {
                    Thread.sleep(milltime);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    });
    timer.start();
}