How to pause sleep thread or process in Android

Question

I want to make a pause between two lines of code  Let me explain a bit    -  the user clicks a button  a card in fact  and I show it by changing the background of this button    thisbutton setBackgroundResource R drawable icon     -  after let s say 1 second  I need to go back to the previous state of the button by changing back its background    thisbutton setBackgroundResource R drawable defaultcard     -  I ve tried to pause the thread between these two lines of code with   try       Thread sleep 1000     catch  InterruptedException e           TODO Auto-generated catch block     e printStackTrace        However  this does not work  Maybe it s the process and not the Thread that I need to pause   I ve also tried  but it doesn t work    new Reminder 5     With this   public class Reminder    Timer timer           public Reminder int seconds                timer   new Timer                timer schedule new RemindTask    seconds 1000                      class RemindTask extends TimerTask               public void run                     System out format  Time s up  n                    timer cancel      Terminate the timer thread                                   How can I pause sleep the thread or process

User · Answer

You probably don t want to do it that way  By putting an explicit sleep   in your button-clicked event handler  you would actually lock up the whole UI for a second  One alternative is to use some sort of single-shot Timer  Create a TimerTask to change the background color back to the default color  and schedule it on the Timer   Another possibility is to use a Handler  There s a tutorial about somebody who switched from using a Timer to using a Handler   Incidentally  you can t pause a process  A Java  or Android  process has at least 1 thread  and you can only sleep threads

User · Answer

Or you could use   android os SystemClock sleep checkEvery    which has the advantage of not requiring a wrapping try     catch

User · Answer

You can try this one it is short   SystemClock sleep 7000     WARNING  Never  ever  do this on a UI thread   Use this to sleep eg  background thread     Full solution for your problem will be  This is available API 1  findViewById R id button  setOnClickListener new View OnClickListener                  Override             public void onClick final View button                    button setBackgroundResource R drawable avatar dead                   final long changeTime   1000L                  button postDelayed new Runnable                          Override                     public void run                             button setBackgroundResource R drawable avatar small                                            changeTime                                 Without creating tmp Handler  Also this solution is better than  tronman because we do not retain view by Handler  Also we don t have problem with Handler created at bad thread      Documentation     public static void sleep  long ms       Added in API level 1      Waits a given number of milliseconds  of uptimeMillis  before returning  Similar to sleep long   but does not throw InterruptedException  interrupt   events are deferred until the   next interruptible operation     Does not return until at least the specified number of milliseconds has elapsed       Parameters      ms to sleep before returning  in milliseconds of uptime    Code for postDelayed from View class           lt p gt Causes the Runnable to be added to the message queue  to be run    after the specified amount of time elapses     The runnable will be run on the user interface thread  lt  p gt         param action The Runnable that will be executed      param delayMillis The delay  in milliseconds  until the Runnable           will be executed         return true if the Runnable was successfully placed in to the            message queue   Returns false on failure  usually because the            looper processing the message queue is exiting   Note that a            result of true does not mean the Runnable will be processed --            if the looper is quit before the delivery time of the message            occurs then the message will be dropped         see  post     see  removeCallbacks     public boolean postDelayed Runnable action  long delayMillis        final AttachInfo attachInfo   mAttachInfo      if  attachInfo    null            return attachInfo mHandler postDelayed action  delayMillis                Assume that post will succeed later     ViewRootImpl getRunQueue   postDelayed action  delayMillis       return true

User · Answer

In addition to Mr  Yankowsky s answers  you could also use postDelayed    This is available on any View  e g   your card  and takes a Runnable and a delay period  It executes the Runnable after that delay

User · Answer

If you use Kotlin and coroutines  you can simply do  GlobalScope launch      delay 3000     In ms      Code after sleep     And if you need to update UI  GlobalScope launch     delay 3000    GlobalScope launch Dispatchers Main          Action on UI thread

User · Answer

I know this is an old thread  but in the Android documentation I found a solution that worked very well for me     new CountDownTimer 30000  1000         public void onTick long millisUntilFinished            mTextField setText  seconds remaining      millisUntilFinished   1000              public void onFinish             mTextField setText  done             start      https   developer android com reference android os CountDownTimer html  Hope this helps someone

User · Answer

This is my example  Create a Java Utils       import android app ProgressDialog      import android content Context      import android content Intent       public class Utils            public static void showDummyWaitingDialog final Context context  final Intent startingIntent                                   final ProgressDialog progressDialog   ProgressDialog show context   Please wait       Loading data       true                new Thread                     public void run                         try                             Do some work here                         sleep 5000                         catch  Exception e                                                 start next intent                     new Thread                             public void run                                Dismiss the Dialog                          progressDialog dismiss                               start selected activity                         if   startingIntent    null  context startActivity startingIntent                                                   start                                    start

User · Answer

class MyActivity      private final Handler handler   new Handler        private Runnable yourRunnable      protected void onCreate  Nullable Bundle savedInstanceState                          this yourRunnable   new Runnable                     Override                public void run                          code                                          this handler postDelayed this yourRunnable  2000                    Override   protected void onDestroy              to avoid memory leaks       this handler removeCallbacks this yourRunnable                   And to be double sure you can be combined it with the  static class  method as described in the tronman answer

User · Answer

I use CountDownTime  new CountDownTimer 5000  1000          Override     public void onTick long millisUntilFinished               do something after 1s             Override     public void onFinish                do something end times 5s          start

User · Answer

This is what I did at the end of the day - works fine now     Override     public void onClick View v            my button setBackgroundResource R drawable icon              SLEEP 2 SECONDS HERE             final Handler handler   new Handler             Timer t   new Timer             t schedule new TimerTask                      public void run                              handler post new Runnable                                      public void run                                       my button setBackgroundResource R drawable defaultcard                                                                                                  2000

User · Answer

One solution to this problem is to use the Handler postDelayed   method  Some Google training materials suggest the same solution    Override public void onClick View v        my button setBackgroundResource R drawable icon        Handler handler   new Handler         handler postDelayed new Runnable               Override           public void run                    my button setBackgroundResource R drawable defaultcard                       2000        However  some have pointed out that the solution above causes a memory leak because it uses a non-static inner and anonymous class which implicitly holds a reference to its outer class  the activity   This is a problem when the activity context is garbage collected     A more complex solution that avoids the memory leak subclasses the Handler and Runnable with static inner classes inside the activity since static inner classes do not hold an implicit reference to their outer class   private static class MyHandler extends Handler    private final MyHandler mHandler   new MyHandler     public static class MyRunnable implements Runnable       private final WeakReference lt Activity gt  mActivity       public MyRunnable Activity activity            mActivity   new WeakReference lt  gt  activity               Override     public void run             Activity activity   mActivity get            if  activity    null                Button btn    Button  activity findViewById R id button               btn setBackgroundResource R drawable defaultcard                      private MyRunnable mRunnable   new MyRunnable this    public void onClick View view        my button setBackgroundResource R drawable icon           Execute the Runnable in 2 seconds     mHandler postDelayed mRunnable  2000       Note that the Runnable uses a WeakReference to the Activity  which is necessary in a static class that needs access to the UI

User · Answer

I use this   Thread closeActivity   new Thread new Runnable        Override   public void run         try         Thread sleep 3000            Do some stuff       catch  Exception e          e getLocalizedMessage

[android] How to pause / sleep thread or process in Android?

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