How to loop or execute a function every 5 seconds on Android

问题

How can I loop that time() function on the onCreate every 5 seconds.. help me I'm a newbie in Android =) ... I want to execute time() function in onCreate every 5 seconds.

 public void onCreate(Bundle savedInstanceState) {
 time(); //<-- How can i execute this every 5 seconds.
 }

 private void time() {
new Handler().postDelayed(new Runnable() {

    @Override
    public void run() {
            int success;
         gps = new GPSTracker(AdminMenu.this);
        if(gps.canGetLocation()){
            tmplat=latitude;
            tmplong=longitude;  
           // new InsertUser1().execute();      
        }

        else{
        gps.showSettingsAlert();
        }

        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println("LATTTTT" + tmplat);
        System.out.println("LONGGGGGGGG" + tmplong);
    } 

}, 5000); // 5 sec

 }

Any help would be appreciated...

回答1:

You could use a handler, given example would call yourfunction() every second

// Init
private Handler handler = new Handler();
private Runnable runnable = new Runnable() {
    @Override
    public void run() {
        yourfunction();
        handler.postDelayed(this, 1000);
    }
};

//Start
handler.postDelayed(runnable, 1000);

回答2:

Try to do like this ! just replace your code in startTimer method. It should work..

private Timer timer;
    private TimerTask timerTask;
    private Handler handler = new Handler();

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

    //To start timer
    private void startTimer(){
        timer = new Timer();
        timerTask = new TimerTask() {
            public void run() {
                handler.post(new Runnable() {
                    public void run(){
                        //your code is here
                    }
                });
            }
        };
        timer.schedule(timerTask, 5000, 5000);
    }

回答3:

 Handler handler = new Handler();
    Runnable runnable = new Runnable() {
        @Override
        public void run() {
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
            if (activefragment == null)

            {
                fragmentTransaction.remove(activefragment);
            } else

            {
                fragmentTransaction.replace(R.id.fragmentContainer, activefragment, activefragment.getTag());
                fragmentTransaction.disallowAddToBackStack();
            }
            fragmentTransaction.commit();

        }
    };
    handler.postDelayed(runnable, timeout);

回答4:

Here's a simple way to do it in Kotlin.

private lateinit var timer: Timer
private val noDelay = 0L
private val everyFiveSeconds = 5000L

override fun onResume() {
    super.onResume()

    val timerTask = object : TimerTask() {
        override fun run() {
            runOnUiThread { /* your code here */ }
        }
    }

    timer = Timer()
    timer.schedule(timerTask, noDelay, everySecond)
}

override fun onPause() {
    super.onPause()

    timer.cancel()
    timer.purge()
}

来源：https://stackoverflow.com/questions/34880389/how-to-loop-or-execute-a-function-every-5-seconds-on-android

标签

android

loops

postdelayed