How to run a method every X seconds

Question

I m developing an Android 2 3 3 application and I need to run a method every X seconds   In iOS  I have NSTimer  but in Android I don t know what to use   Someone have recommend me Handler  another recommend me AlarmManager but I don t know which method fits better with NSTimer   This is the code I want to implement in Android   timer2         NSTimer scheduledTimerWithTimeInterval  1 0f 20 0f      target self     selector  selector loopTask      userInfo nil     repeats YES     timer1         NSTimer scheduledTimerWithTimeInterval  1 0f 4 0f      target self     selector  selector isFree      userInfo nil     repeats YES      I need something what works like NSTimer   What do you recommend me

User · Accepted Answer

The solution you will use really depends on how long you need to wait between each execution of your function.

If you are waiting for longer than 10 minutes, I would suggest using AlarmManager.

// Some time when you want to run
Date when = new Date(System.currentTimeMillis());

try {
    Intent someIntent = new Intent(someContext, MyReceiver.class); // intent to be launched

    // Note: this could be getActivity if you want to launch an activity
    PendingIntent pendingIntent = PendingIntent.getBroadcast(
        context,
        0, // id (optional)
        someIntent, // intent to launch
        PendingIntent.FLAG_CANCEL_CURRENT // PendingIntent flag
    );

    AlarmManager alarms = (AlarmManager) context.getSystemService(
        Context.ALARM_SERVICE
    );

    alarms.setRepeating(
        AlarmManager.RTC_WAKEUP,
        when.getTime(),
        AlarmManager.INTERVAL_FIFTEEN_MINUTES,
        pendingIntent
    );
} catch(Exception e) {
    e.printStackTrace();
}

Once you have broadcasted the above Intent, you can receive your Intent by implementing a BroadcastReceiver. Note that this will need to be registered either in your application manifest or via the context.registerReceiver(receiver, intentFilter); method. For more information on BroadcastReceiver's please refer to the official documentation..

public class MyReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent)
    {
        System.out.println("MyReceiver: here!") // Do your work here
    }
}

If you are waiting for shorter than 10 minutes then I would suggest using a Handler.

final Handler handler = new Handler();
final int delay = 1000; // 1000 milliseconds == 1 second

handler.postDelayed(new Runnable() {
    public void run() {
        System.out.println("myHandler: here!"); // Do your work here
        handler.postDelayed(this, delay);
    }
}, delay);

User · Answer

Use Timer for every second     new Timer   scheduleAtFixedRate new TimerTask          Override     public void run               your method          0  1000    put here time 1000 milliseconds 1 second

User · Answer

Here I used a thread in onCreate   an Activity repeatly  timer does not allow everything in some cases Thread is the solution       Thread t   new Thread              Override         public void run                 while   isInterrupted                      try                       Thread sleep 10000      1000ms   1 sec                     runOnUiThread new Runnable                              Override                         public void run                                  SharedPreferences mPrefs   getSharedPreferences  sam   MODE PRIVATE                               Gson gson   new Gson                                String json   mPrefs getString  chat list                                    GelenMesajlar model   gson fromJson json  GelenMesajlar class                               String sam                                    ChatAdapter adapter   new ChatAdapter Chat this  model getData                                 listview setAdapter adapter                                 listview setStackFromBottom true                                 Util showMessage Chat this  Merhabalar                                                                         catch  InterruptedException e                        e printStackTrace                                                          t start      In case it needed it can be stoped by    Override protected void onDestroy         super onDestroy        Thread interrupted          t interrupted

User · Answer

With Kotlin  we can now make a generic function for this   object RepeatHelper       fun repeatDelayed delay  Long  todo     - gt  Unit            val handler   Handler           handler postDelayed object   Runnable               override fun run                     todo                   handler postDelayed this  delay                           delay            And to use  just do   val delay   1000L RepeatHelper repeatDelayed delay        myRepeatedFunction

User · Answer

new CountDownTimer 120000  1000             public void onTick long millisUntilFinished                txtcounter setText       millisUntilFinished   1000                       public void onFinish                  txtcounter setText   TimeOut                  Main2Activity ShowPayment   false              EventBus getDefault   post  go-main                      start

User · Answer

If you are familiar with RxJava  you can use Observable interval    which is pretty neat   Observable interval 60  TimeUnits SECONDS             flatMap new Function lt Long  ObservableSource lt String gt  gt                       Override                 public ObservableSource lt String gt  apply  NonNull Long aLong  throws Exception                       return getDataObservable      Where you pull your data                                     The downside of this is that you have to architect polling your data in a different way  However  there are a lot of benefits to the Reactive Programming way    Instead of controlling your data via a callback  you create a stream of data that you subscribe to  This separates the concern of  polling data  logic and  populating UI with your data  logic so that you do not mix your  data source  code and your UI code  With RxAndroid  you can handle threads in just 2 lines of code   Observable interval 60  TimeUnits SECONDS         flatMap         polling data code        subscribeOn Schedulers newThread       poll data on a background thread        observeOn AndroidSchedulers mainThread       populate UI on main thread        subscribe          your UI code    Please check out RxJava  It has a high learning curve but it will make handling asynchronous calls in Android so much easier and cleaner

User · Answer

You can please try this code to call the handler every 15 seconds via onResume   and stop it when the activity is not visible  via onPause     Handler handler   new Handler    Runnable runnable  int delay   15 1000    Delay for 15 seconds   One second   1000 milliseconds     Override protected void onResume          start handler as activity become visible      handler postDelayed  runnable   new Runnable             public void run                   do something              handler postDelayed runnable  delay                    delay        super onResume          If onPause   is not included the threads will double up when you     reload the activity    Override protected void onPause         handler removeCallbacks runnable     stop handler when activity not visible     super onPause

User · Answer

Here maybe helpful answer for your problem using Rx Java  amp  Rx Android

[android] How to run a method every X seconds

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