如何停止 Timer 线程？

Question

如何停止 Timer 线程？ 我有一个计时器线程，我想停止它。我该怎么做？

我试图通过停止线程来停止，但没有成功。 有任何想法吗？ 提前感谢您的帮助

这是我的代码：

   public void startTimer() {
    startTime = System.currentTimeMillis();
    final Handler handler = new Handler();
    task =new Thread() {
        @Override
        public void run() {
            long millis = System.currentTimeMillis()-startTime;
            long secs = millis / 1000 % 60; // seconds, 0 - 59
            long mins = millis / 1000 / 60 % 60; // total seconds / 60, 0 - 59
            long hours = millis / 1000 / 60 / 60; // total seconds / 3600, 0 - limitless

            timeString = String.format("%02d:%02d:%02d", hours, mins, secs);
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    mtvtimer.setText(timeString);
                }
            });

            handler.postDelayed(task, 1000);

        }


    };
    task.start();


    }

Answer 1

鉴于 Thread.stop 已被弃用，您唯一的选择是添加一些您自己的信号，例如您希望它停止时设置的布尔变量。

例如

boolean stop = false;
public void startTimer() {
    startTime = System.currentTimeMillis();
    final Handler handler = new Handler();
    task =new Thread() {
        @Override
        public void run() {
            if (stop) {
                return;
            }
            long millis = System.currentTimeMillis()-startTime;
            long secs = millis / 1000 % 60; // seconds, 0 - 59
            long mins = millis / 1000 / 60 % 60; // total seconds / 60, 0 - 59
            long hours = millis / 1000 / 60 / 60; // total seconds / 3600, 0 - limitless

            timeString = String.format("%02d:%02d:%02d", hours, mins, secs);
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    mtvtimer.setText(timeString);
                }
            });

           handler.postDelayed(task, 1000);
    }

从其他地方，你设置stop = true 来阻止它。 （这是一个粗略的示例代码，只是为了理解这个想法）

Answer 2

从您发布的 sn-p 来看，您想要实现的目标还不是很清楚。您正在将任务传递给 TimerJob 的处理程序，同时调用 task.start() ，这意味着每次任务开始时，它都会将另一个任务附加到处理程序，只要使用线程。因此，如果我正确理解了您的逻辑，您可以执行以下示例：

 //Handler should be created only once , and should have the specified methods
 //in which he is needed to respond , 
 //for complicated tasks , create a new Specific Handler 
 final Handler handler = new Handler();
 //Defining Thread for example
 Thread task;
 public void startTimer() {
        startTime = System.currentTimeMillis();
        task =new Thread() {
            @Override
            public void run() {
                long millis = System.currentTimeMillis()-startTime;
                long secs = millis / 1000 % 60; // seconds, 0 - 59
                long mins = millis / 1000 / 60 % 60; // total seconds / 60, 0 -59
                long hours = millis / 1000 / 60 / 60; // total seconds / 3600, 0 - limitless

                timeString = String.format("%02d:%02d:%02d", hours, mins, secs);
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        mtvtimer.setText(timeString);
                    }
                //repeat the task
                handler.postDelayed(task, 1000);
                });     
            }

        };
        //No Reason To start an unmanaged thread 
        //task.start();
        //instead passing it to the handler , 
        //and still you can call interrupt on the task reference
        handler.postDelayed(task, 1000);

    }


//To call whenever you have to stop the task
public void stopHandlerTask()
{
     //your logic here
     handler.removeCallbacks(task);
}

Answer 3

这似乎是一个计时器的工作：

//references for the timer, task and start time.
Timer timer;
TimerTask task;
long startTime;

public void onCreate()
{
    task = new TimerTask() {
        @Override
        public void run() {
            long millis = System.currentTimeMillis()-startTime;
            long secs = millis / 1000 % 60; // seconds, 0 - 59
            long mins = millis / 1000 / 60 % 60; // total seconds / 60, 0 -59
            long hours = millis / 1000 / 60 / 60; // total seconds / 3600, 0 - limitless

            mtvtimer.setText(String.format("%02d:%02d:%02d", hours, mins, secs));
        }
    };
}

//start the timer
public void startTimer()
{
    timer = new Timer();
    timer.schedule(task, 1000, 1000);// start after 1 second and repeat after every second.
}

//stop the timer
public void stopTimer()
{
    if(timer != null) {
        timer.cancel();
        timer.purge();
        timer = null;
    }
}