如何在android中固定一段时间后重复任务？

Question

我想在每5秒后重复调用一个方法,每当我想停止重复调用该方法时,我可能会停止或重新启动该方法的重复调用.

这是一些我想要实现的示例代码.请在这方面帮助我,我将非常感谢你.

private int m_interval = 5000; // 5 seconds by default, can be changed later
private Handler m_handler;

@Override
protected void onCreate(Bundle bundle)
{
  ...
  m_handler = new Handler();
}

Runnable m_statusChecker = new Runnable()
{
     @Override 
     public void run() {
          updateStatus(); //this function can change value of m_interval.
          m_handler.postDelayed(m_statusChecker, m_interval);
     }
};

public void startRepeatingTask()
{
    m_statusChecker.run(); 
}

public void stopRepeatingTask()
{
    m_handler.removeCallbacks(m_statusChecker);
}  

Answer 1

使用以下设置重复任务:

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

    @Override
    public void run() {
        //Called each time when 1000 milliseconds (1 second) (the period parameter)
    }

},
//Set how long before to start calling the TimerTask (in milliseconds)
0,
//Set the amount of time between each execution (in milliseconds)
1000);

如果你想取消任务,只需t.cancel()在这里打电话t就是你的Timer对象

你也可以查看你的答案下面的评论,他们已经给出了简要的信息.

Answer 2

在方法中使用处理程序onCreate().它的postDelayed()方法使得它Runnable被添加到消息队列中并在指定的时间量过去之后运行(在给定的示例中为0).然后,这将在固定的时间(本例中为1000毫秒)后排队.

参考此代码:

public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    android.os.Handler customHandler = new android.os.Handler();
    customHandler.postDelayed(updateTimerThread, 0);
}

private Runnable updateTimerThread = new Runnable()
{
    public void run()
    {
        //write here whaterver you want to repeat
        customHandler.postDelayed(this, 1000);
    }
};

Answer 3

使用TimerTask在特定时间间隔后调用

    Timer timer = new Timer();
    timer.schedule(new UpdateTimeTask(),1, TimeInterval);

和

  class UpdateTimeTask extends TimerTask {

        public void run() 
           {        
            // do stufff
           }

        }