How to Run a Runnable Thread in Android At Defined Intervals

How to run a Runnable thread in Android at defined intervals?

The simple fix to your example is :

handler = new Handler();

final Runnable r = new Runnable() {
    public void run() {
        tv.append("Hello World");
        handler.postDelayed(this, 1000);
    }
};

handler.postDelayed(r, 1000);

Or we can use normal thread for example (with original Runner) :

Thread thread = new Thread() {
    @Override
    public void run() {
        try {
            while(true) {
                sleep(1000);
                handler.post(this);
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
};

thread.start();

You may consider your runnable object just as a command that can be sent to the message queue for execution, and handler as just a helper object used to send that command.

More details are here http://developer.android.com/reference/android/os/Handler.html

How to make a new thread, Android Studio?

I have encountered the same problem.

The solution for my issue was to create 3 runnables and start them in onCreate() Method.

It looks like that:

Thread thread = new Thread(runnable);
thread.start();

In order to create runnable "object" just do the following:

Runnable runnable = new Runnable(){
    public void run() {   
       //some code here
    }
}; 

If you want some delayed action, you can work with post delayed in runnable interface (beware, postDelayed() would just repeat the whole runnable. You can avoid that, by adding some conditions)

Runnable runnable = new Runnable(){
    public void run() {   
       //some code here
       handler.postDelayed(this, 1000);
    }
}; 

If you want to update GUI, you should invoke following command inside your runnable:

handler.post(new Runnable() {
     @Override
     public void run () {
     // upate textFields, images etc...

     }
});

P.S. If you have multiple threads and they must be started at different time you can start them from Runnables.

Some pages that can be helpful:

new Runnable() but no new thread?

What's the difference between Thread start() and Runnable run()

How to run a Runnable thread in Android at defined intervals?

When to use handler.post() & when to new Thread()

Android: execute code in regular intervals

You can do that using the below code,
Hope it helps!

final Handler handler = new Handler(); 
Runnable runnable = new Runnable() { 

    @Override 
    public void run() { 
        try{
            //do your code here
        }
        catch (Exception e) {
            // TODO: handle exception
        }
        finally{
            //also call the same runnable to call it at regular interval
            handler.postDelayed(this, 1000); 
        }
    } 
}; 

//runnable must be execute once
handler.post(runnable);

i want to call a thread after an interval in android

I would use a Timer with a TimerTask:

TimerTask myTimerTask = new TimerTask() {

    public void run() {
    //do your code here
    }
};

Timer myTimer = new Timer();

myTimer.schedule(myTimerTask, when you want to start?[im milliseconds for example], 300000[5mins]);

And if you don't want to execute the TimerTask again simply call. myTimer.cancel();

Notice Don't Forget to call myTimer.cancel(); in your onPause because otherwise the timer will continue executing and this Drains battery!

Update regarding your comment
myTimer.schedule can take various Parameters. Interesting for you are this one:

myTimer.schedule(Runnable r, When to first execute, In which Interval);

Runnable r is your TimerTask which will be executed after
When to first execute expired. If you want to start immediatly, simply pass 0.
In which Interval if you put in there 50, then your TimerTask will be execute every 50ms, after When to first execute expired.

This should do the trick.

Hope it helps! ;)

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