handler, I want to run periodically

Question

Using handler wants to run periodically The count is 0, if the countis 1, else Please fix this code.

mRunnable = new Runnable(){
  @Override
  public void run() {
    if (count == 0) {
      setImage();
      count = 1;
    } else {
      weather = mContentResolver.getType(mUri);
      setWeather(weather);
      count = 0;
    }
  } 
};
mHandler = new Handler();
mHandler.postDelayed(mRunnable, 3000);

what's wrong with the code? Did you forget to call `mRunnable.run()`? — Raghunandan, Jul 31 '13 at 05:01
@Raghunandan uhm... no problem but This code does not execute periodically repeated. — Jonghwan Seo, Jul 31 '13 at 05:06
@AndroidKiller no problem but This code does not execute periodically repeated. — Jonghwan Seo, Jul 31 '13 at 05:07
@Cole"Cole9"Johnson he is the boss and he is ordering us to do so. So do it. :p ;). Else he will cut our salary. — Android Killer, Jul 31 '13 at 05:10
@AndroidKiller what? You mean the rations fed to me by my parental units? Oh please no! — Cole Tobin, Jul 31 '13 at 05:11
@JonghwanSeo http://stackoverflow.com/questions/17839419/android-thread-for-a-timer/17839725#17839725. you can use a handler, a timer, a coundowntimer. — Raghunandan, Jul 31 '13 at 05:19

score 9 · Accepted Answer · edited May 23 '17 at 12:30

9

Try the below

m_Handler = new Handler();
mRunnable = new Runnable(){
    @Override
    public void run() {
        if(count == 0){
            // do something
            count = 1;
        }
        else if (count==1){
            // do something
            count = 0;
        }
        m_Handler.postDelayed(mRunnable, 3000);// move this inside the run method
    } 
};
mRunnable.run(); // missing

Also check this

Android Thread for a timer

edited May 23 '17 at 12:30

Community

1
1

answered Jul 31 '13 at 05:36

Raghunandan

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!!!!!!!!!!!!!!!! Thank!!!!!!!!!!!!U!!!!!!!!!!!!!!!!!!!! i love u so much @Raghunandan – Jonghwan Seo Jul 31 '13 at 05:46
wouldn't **m_Handler.post(mRunnable)** be better than **mRunnable.run()** ? – gopi1410 May 12 '18 at 05:48
@gopi1410 yup you could do that( the android way) – Raghunandan May 12 '18 at 11:15

score 5 · Answer 2 · answered Jul 31 '13 at 05:07

5

You should go for Timer and TimerTask in that case. Below is a small example:

//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)
        //put your code here
    }

},
//Set how long before to start calling the TimerTask (in milliseconds)
0,
//Set the amount of time between each execution (in milliseconds)
3000);

Hope this is what you needed.

answered Jul 31 '13 at 05:07

Android Killer

18,174
13
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@Raghunandan i don't think handler is having any function to repeat the code periodically. Or is thr any ? – Android Killer Jul 31 '13 at 05:08
http://stackoverflow.com/questions/17839419/android-thread-for-a-timer/17839725#17839725. check this you can use a handler also. Also you cannot update ui from the timer as it runs on a different thread – Raghunandan Jul 31 '13 at 05:09
`setImage();` is probably setting image ie updating ui – Raghunandan Jul 31 '13 at 05:12
In that case you can use runOnUiThread() inside setImage() method itself. – Android Killer Jul 31 '13 at 05:13
Handler we can use for sure as @altaf told in his answer. But that code looks repeatedly calling postDelayed which looks little weird but you can take my answer as another way of doing that. :) – Android Killer Jul 31 '13 at 05:18
everybody thank you so much .. i'm sorry that i dont speak english very well – Jonghwan Seo Jul 31 '13 at 05:24
@JonghwanSeo come on don't worry about that. This is not an english learning forum. So did u make it work in anyway ? – Android Killer Jul 31 '13 at 05:25
@AndroidKiller no .. yet I will make. Program that converts alternating icon and In fact, I'm a beginner Android so it hard. – Jonghwan Seo Jul 31 '13 at 05:32

QuokMoon · Answer 3 · 2013-07-31T05:23:29.553

0

 private Handler handler = new Handler();
 handler.post(timedTask);

private Runnable timedTask = new Runnable(){

  @Override
  public void run() {
   // TODO Auto-generated method stub
   cnt++;
   if(cnt==0)
   {
    //set you view or update your 
   }

   handler.postDelayed(timedTask, 500);
  }};
}

edited Jul 31 '13 at 05:23

answered Jul 31 '13 at 05:14

QuokMoon

4,387
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handler, I want to run periodically

3 Answers3