Question

我已经在MainActivity.java中设置了2分钟的计时器，如果我转到其他活动并返回MainActivity，计时器将被重置。但我希望计时器运行，即使活动被更改。请帮忙解决这个问题。这是我的计时器代码。

//Declare the timer
    Timer t = new Timer();
    //Set the schedule function and rate
    t.scheduleAtFixedRate(new TimerTask() {

        @Override
        public void run() {
            runOnUiThread(new Runnable() {

                @Override
                public void run() {
                    TextView tv = (TextView) findViewById(R.id.main_timer_text);
                    tv.setText(String.valueOf(minutes)+":"+String.valueOf(seconds));

                    seconds -= 1;
                    if(seconds == 0)
                    {
                        tv.setText(String.valueOf(minutes)+":"+String.valueOf(seconds));

                        seconds=60;
                        minutes=minutes-1;

                  }

                }

            });
        }

    }, 0, 1000);
}

Answer 1

使用CountDownTimer，因为onTick(long)的呼叫已同步

new CountDownTimer(30000, 1000) {

             public void onTick(long millisUntilFinished) {
                 text.setText("seconds remaining: " + millisUntilFinished / 1000);
             }

             public void onFinish() {
                 text.setText("done!");
             }
          }.start();

来源：http://developer.android.com/reference/android/os/CountDownTimer.html

Answer 2

试试这个示例代码......

    final Timer timer = new Timer();
    timer.scheduleAtFixedRate(new TimerTask() {
        int k = -1000;

        @Override
        public void run() {
            if (k == 2 * 60 * 1000) {
                timer.cancel();
                timer.purge();
                Log.i(TAG, "Timer cancelled");
                return;
            }
            runOnUiThread(.... do your work....);
            k += 1000;
            Log.i(TAG, "Timer running...");
        }
    }, 0, 1000);

在onCreate（）...

中写下这个

在android中设置计时器的问题

2 个答案: