postAtTime不会触发

Question

我正在尝试创建一个每分钟更改UI的应用程序,但是我在postAtTime函数中遇到了很多困难,因为我无法触发它.我已经用postDelay尝试了它并且它可以工作,但postAtTime应该给我更多的准确性.

我获取当前时间并设置日历,然后在日期中添加一分钟并调用postAtTime,但它不会触发.让我们看看你是否可以帮助我.

   private Runnable showMinute = new Runnable() {
    public void run() {
        calendar = Calendar.getInstance();
        minute = calendar.get(Calendar.MINUTE);
        minute = minute % 10;

        switch (minute){
        case 0: numero.setImageResource(R.drawable.b0);
            break;
        case 1: numero.setImageResource(R.drawable.b1);
            break;
        case 2: numero.setImageResource(R.drawable.b2);
            break;
        case 3: numero.setImageResource(R.drawable.b3);
            break;
        case 4: numero.setImageResource(R.drawable.b4);
            break;
        case 5: numero.setImageResource(R.drawable.b5);
            break;
        case 6: numero.setImageResource(R.drawable.b6);
            break;
        case 7: numero.setImageResource(R.drawable.b7);
            break;
        case 8: numero.setImageResource(R.drawable.b8);
            break;
        case 9: numero.setImageResource(R.drawable.b9);
            break;
        default:
            break;
        }


        handler.removeCallbacks(mostrarHora);
        calendar.add(Calendar.MINUTE, 1);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        handler.postAtTime(showMinute, calendar.getTimeInMillis());
    }
  };

Answer 1

您正在使用绝对时间(来自Calendar班级).时间handler.postAtTime格式是ms自启动以来的数量.

你应该用SystemClock.uptimeMillis()你的计算.