计划的计时器任务不会执行

Question

timeRemaining变量是表示0-10范围内的整数的字符串。我想要完成的是运行timerTask一段timeRemaining秒，然后转到以i++开头的以下代码。但是，当我运行此方法时，i++部分立即执行，并且计时器任务根本不执行。它基本上应该从timeRemaining倒数到0并将时间减少到0然后继续使用其余的代码。

public void resumeSlideShow(Integer i, final String timeRemaining, int offset) {
    timer = new Timer();
    Button time_rem = (Button) findViewById(R.id.time_rem);
    time_rem.setBackgroundResource(R.drawable.hex_filled);
    final TimerTask finish_photo = new TimerTask() {
        @Override
        public void run() {
            SlideShow.this.runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    TextView time_rem = (TextView) findViewById(R.id.time_rem);
                    int timeRem = Integer.parseInt(timeRemaining);
                    timeRem--;
                    time_rem.setText(Integer.toString(timeRem));
                    if (timeRem == 0) {
                        timer.cancel();
                    }
                }});
        }};
    timer.scheduleAtFixedRate(finish_photo,0,1000);
    i++;
    if (i < imageDisplayerArrayList.size()) {
        timer.cancel();
        timer = new Timer();
        slideshow(imageDisplayerArrayList, i, offset, timeRemaining);
    }
    else {
        timer.cancel();
        Intent qa = new Intent(SlideShow.this,ViewScreen.class);
        startActivity(qa);
        finish();
    }

}