What is the equivalent to a JavaScript setInterval setTimeout in Android Java

Question

Can anyone tell me if an equivalent for setInterval setTimeout exists for Android  Does anybody have any example about how to do it

User · Answer

Depending on what you actually want to achieve, you should take a look at Android Handlers:

http://developer.android.com/reference/android/os/Handler.html

If you previously used javascript setTimeout() etc to schedule a task to run in the future, this is the Android way of doing it (postDelayed / sendMessageDelayed).

Note that neither Handlers or Timers makes an Android phone wake up from sleep mode. In other words, if you want to schedule something to actually happen even though the screen is off / cpu is sleeping, you need to check out the AlarmManager too.

User · Answer

import java util Timer  import java util TimerTask   class Clock       private Timer mTimer   new Timer         private int mSecondsPassed   0      private TimerTask mTask   new TimerTask              Override         public void run                 mSecondsPassed                System out println  Seconds passed      mSecondsPassed                         private void start             mTimer scheduleAtFixedRate mTask  1000  1000              public static void main String   args            Clock c   new Clock            c start

User · Answer

As always with Android there s lots of ways to do this  but assuming you simply want to run a piece of code a little bit later on the same thread  I use this  new android os Handler Looper getMainLooper    postDelayed      new Runnable             public void run                 Log i  quot tag quot    quot This ll run 300 milliseconds later quot                      300       this is pretty much equivalent to setTimeout       function             console log  quot This will run 300 milliseconds later quot           300

User · Answer

Here s a setTimeout equivalent  mostly useful when trying to update the User Interface after a delay   As you may know  updating the user interface can only by done from the UI thread  AsyncTask does that for you by calling its onPostExecute method from that thread   new AsyncTask lt Void  Void  Void gt               Override         protected Void doInBackground Void    params                try                   Thread sleep 5000                 catch  InterruptedException e                               return null                      Override         protected void onPostExecute Void result                   Update the User Interface                  execute

User · Answer

setInterval    function that repeats itself in every n milliseconds  Javascript    setInterval function    Console log  A Kiss every 5 seconds       5000     Approximate java Equivalent  new Timer   scheduleAtFixedRate new TimerTask         Override     public void run           Log i  tag    A Kiss every 5 seconds            0 5000     setTimeout    function that works only after n milliseconds  Javascript   setTimeout function    Console log  A Kiss after 5 seconds      5000     Approximate java Equivalent  new android os Handler   postDelayed      new Runnable             public void run                 Log i  tag   A Kiss after 5 seconds                 5000

User · Answer

Kotlin  You can also use CountDownTimer  class Timer       companion object            JvmStatic         fun call ms  Long  f     - gt  Unit                object   CountDownTimer ms ms                   override fun onFinish     f                     override fun onTick millisUntilFinished  Long                   start                      And in your code  Timer call 5000      Whatever you want to execute after 5000 ms

User · Answer

I was creating a mp3 player for android  I wanted to update the current time every 500ms so I did it like this setInterval private void update         new android os Handler   postDelayed new Runnable              Override         public void run                 long cur   player getCurrentPosition                long dur   player getDuration                currentTime   millisecondsToTime cur               currentTimeView setText currentTime               if  cur  lt  dur                    updatePlayer                                  update seekbar             seekBar setProgress   int  Math round  float cur    float dur   100f                     500      which calls the  same method recursively

User · Answer

I do not know much about JavaScript  but I think Timers may be what you are looking for   http   developer android com reference java util Timer html  From the link   One-shot are scheduled to run at an absolute time or after a relative delay   Recurring tasks are scheduled with either a fixed period or a fixed rate

User · Answer

The first answer is definitely the correct answer and is what I based this lambda version off of  which is much shorter in syntax   Since Runnable has only 1 override method  run     we can use a lambda   this m someBoolFlag   false  new android os Handler   postDelayed    - gt  this m someBoolFlag   true  300

User · Answer

If you re not worried about waking your phone up or bringing your app back from the dead  try      Param is optional  to run task on UI thread       Handler handler   new Handler Looper getMainLooper     Runnable runnable   new Runnable          Override     public void run                Do the task            handler postDelayed this  milliseconds     Optional  to repeat the task           handler postDelayed runnable  milliseconds       Stop a repeating task like this  handler removeCallbacks runnable

[java] What is the equivalent to a JavaScript setInterval/setTimeout in Android/Java?

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