How to set a timer in android

Question

What is the proper way to set a timer in android in order to kick off a task  a function that I create which does not change the UI    Use this the Java way  http   docs oracle com javase 1 5 0 docs api java util Timer html  Or there is a better way in android  android s handler

User · Answer

It is situational   The Android documentation suggests that you should use AlarmManager to register an Intent that will fire at the specified time if your application may not be running   Otherwise  you should use Handler      Note  The Alarm Manager is intended   for cases where you want to have your   application code run at a specific   time  even if your application is not   currently running  For normal timing   operations  ticks  timeouts  etc  it   is easier and much more efficient to   use Handler

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I hope this one is helpful and may take less efforts to implement  Android CountDownTimer class  e g    new CountDownTimer 30000  1000          public void onTick long millisUntilFinished              mTextField setText  seconds remaining      millisUntilFinished   1000                  public void onFinish               mTextField setText  done                 start

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As I have seen it  java util Timer is the most used for implementing a timer   For a repeating task   new Timer   scheduleAtFixedRate task  after  interval     For a single run of a task   new Timer   schedule task  after      task being the method to be executed after the time to initial execution  interval the time for repeating the execution

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I m an Android newbie but here is the timer class I created based on the answers above  It works for my app but I welcome any suggestions    Usage example        public Handler uiHandler   new Handler       private Runnable runMethod   new Runnable                 public void run                              do something                       timer   new UITimer handler  runMethod  timeoutSeconds 1000                  timer start          public class UITimer       private Handler handler      private Runnable runMethod      private int intervalMs      private boolean enabled   false      private boolean oneTime   false       public UITimer Handler handler  Runnable runMethod  int intervalMs                this handler   handler          this runMethod   runMethod          this intervalMs   intervalMs             public UITimer Handler handler  Runnable runMethod  int intervalMs  boolean oneTime                this handler  runMethod  intervalMs           this oneTime   oneTime             public void start                 if  enabled              return           if  intervalMs  lt  1                        Log e  timer start    Invalid interval     intervalMs               return                     enabled   true          handler postDelayed timer tick  intervalMs                      public void stop                 if   enabled              return           enabled   false          handler removeCallbacks runMethod           handler removeCallbacks timer tick              public boolean isEnabled                 return enabled             private Runnable timer tick   new Runnable                 public void run                         if   enabled                  return               handler post runMethod                if  oneTime                                enabled   false                  return                             handler postDelayed timer tick  intervalMs

User · Answer

For timing operation you should use Handler    If you need to run a background service the AlarmManager is the way to go

User · Answer

yes java s timer can be used  but as the question asks for better way  for mobile   Which is explained Here     For the sake of StackOverflow   Since Timer creates a new thread it may be considered heavy   if all you need is to get is a call back while the activity is running a Handler can be used in conjunction with a   Runnable   private final int interval   1000     1 Second private Handler handler   new Handler    private Runnable runnable   new Runnable        public void run             Toast makeText MyActivity this   C Mom no hands    Toast LENGTH SHORT  show                 handler postAtTime runnable  System currentTimeMillis   interval   handler postDelayed runnable  interval     or a Message  private final int EVENT1   1   private Handler handler   new Handler          Override     public void handleMessage Message msg            switch  msg what                     case Event1              Toast makeText MyActivity this   Event 1   Toast LENGTH SHORT  show                break           default              Toast makeText MyActivity this   Unhandled   Toast LENGTH SHORT  show                break                           Message msg   handler obtainMessage EVENT1   handler sendMessageAtTime msg  System currentTimeMillis   interval   handler sendMessageDelayed msg  interval     on a side note this approach can be used  if you want to run a piece of code in the UI thread from an another thread   if you need to get a call back even if your activity is not running then  you can use an AlarmManager

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Here we go   We will need two classes  I am posting a code which changes mobile audio profile after each 5 seconds  5000 mili seconds                Our 1st Class  public class ChangeProfileActivityMain extends Activity         Override     protected void onCreate Bundle savedInstanceState               TODO Auto-generated method stub         super onCreate savedInstanceState            Timer timer   new Timer            TimerTask updateProfile   new CustomTimerTask ChangeProfileActivityMain this           timer scheduleAtFixedRate updateProfile  0  5000              Our 2nd Class  public class CustomTimerTask extends TimerTask        private AudioManager audioManager      private Context context      private Handler mHandler   new Handler            Write Custom Constructor to pass Context     public CustomTimerTask Context con            this context   con              Override     public void run                TODO Auto-generated method stub             your code starts here             I have used Thread and Handler as we can not show Toast without starting new thread when we are inside a thread             As TimePicker has run   thread running   So We must show Toast through Handler post in a new Thread  Thats how it works in Android           new Thread new Runnable                  Override             public void run                     audioManager    AudioManager  context getApplicationContext   getSystemService Context AUDIO SERVICE                   mHandler post new Runnable                          Override                     public void run                             if audioManager getRingerMode      AudioManager RINGER MODE SILENT                                audioManager setRingerMode AudioManager RINGER MODE NORMAL                               Toast makeText context   Ringer Mode set to Normal   Toast LENGTH SHORT  show                              else                               audioManager setRingerMode AudioManager RINGER MODE SILENT                               Toast makeText context   Ringer Mode set to Silent   Toast LENGTH SHORT  show                                                                                                 start

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I used to use  Timer  TimerTask  as well as Handler to kick off  time-consuming  tasks periodically  Now I ve switched the whole to RxJava  RxJava provides Observable timer which is simpler  less error-prone  hassle-free to use   public class BetterTimerFragment extends Fragment     public static final String TAG    BetterTimer     private TextView timeView    private Subscription timerSubscription      Override   public View onCreateView LayoutInflater inflater                              Nullable ViewGroup container                              Nullable Bundle savedInstanceState        return inflater inflate R layout fragment timer  container  false           Override   public void onViewCreated View view   Nullable Bundle savedInstanceState        super onViewCreated view  savedInstanceState       timeView    TextView  view findViewById R id timeView           Override   public void onResume         super onResume            Right after the app is visible to users  delay 2 seconds        then kick off a  heavy  task every 10 seconds      timerSubscription   Observable timer 2  10  TimeUnit SECONDS           map new Func1 lt Long  String gt                 Override           public String call Long unused                   TODO  Probably do time-consuming work here                 This runs on a different thread than the main thread              return  Time      System currentTimeMillis                                    observeOn AndroidSchedulers mainThread             subscribe new Action1 lt String gt                 Override           public void call String timeText                   The result will then be propagated back to the main thread              timeView setText timeText                          new Action1 lt Throwable gt                 Override           public void call Throwable throwable                Log e TAG  throwable getMessage    throwable                                   Override   public void onPause         super onPause            Don t kick off tasks when the app gets invisible      timerSubscription unsubscribe

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I believe the way to do this on the android is that you need a background service to be running   In that background application  create the timer   When the timer  ticks   set the interval for how long you want to wait   launch your activity which you want to start   http   developer android com guide topics fundamentals html   lt -- this article explains the relationship between activities  services  intents and other core fundamentals of Android development

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Probably Timerconcept   new CountDownTimer 40000  1000      40000 milli seconds is total time  1000 milli seconds is time interval   public void onTick long millisUntilFinished          public void onFinish          start      or   Method 2      Program the timer  Add a new variable of int named time  Set it to 0  Add the following code to onCreate function in MainActivity java     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     Go into the run method and add the following code      We must use this function in order to change the text view text runOnUiThread new Runnable           Override     public void run             TextView tv    TextView  findViewById R id main timer text           tv setText String valueOf time            time    1

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Standard Java way to use timers via java util Timer and java util TimerTask works fine in Android  but you should be aware that this method creates a new thread   You may consider using the very convenient Handler class  android os Handler  and send messages to the handler via sendMessageAtTime android os Message  long  or sendMessageDelayed android os Message  long   Once you receive a message  you can run desired tasks  Second option would be to create a Runnable object and schedule it via Handler s functions postAtTime java lang Runnable  long  or postDelayed java lang Runnable  long

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this example start the timer unitl destroyed in Kotlin  private lateinit var timerTask  TimerTask   timerTask   object   TimerTask             override fun run                 Log d  KTZ     minutes  seconds                timeRecordingLiveData postValue   minutes  seconds               seconds    1              if  seconds    60                    Log d  KTZ     minutes  seconds                    timeRecordingLiveData postValue   minutes  seconds                   seconds   0                  minutes    1                                   Cancel the timertask in onDestroy    timerTask cancel

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I am using a handler and runnable to create a timer  I wrapper this in an abstract class  Just derive implement it and you are good to go    public static abstract class SimpleTimer       abstract void onTimer         private Runnable runnableCode   null      private Handler handler   new Handler         void startDelayed final int intervalMS  int delayMS            runnableCode   new Runnable                  Override             public void run                     handler postDelayed runnableCode  intervalMS                   onTimer                                     handler postDelayed runnableCode  delayMS              void start final int intervalMS            startDelayed intervalMS  0              void stop             handler removeCallbacks runnableCode             Note that the handler postDelayed is called before the code to be executed - this will make the timer more closed timed as  expected   However in cases were the timer runs to frequently and the task  onTimer    is long - there might be overlaps  If you want to start counting intervalMS after the task is done  move the onTimer   call a line above

[android] How to set a timer in android

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