Question

int delay = 1000; // delay for 1 sec. 
int period = 10000; // repeat every 10 sec. 
Timer timer = new Timer(); 
timer.scheduleAtFixedRate(new TimerTask() 
    { 
        public void run() 
        { 
            displayData();  // display the data
        } 
    }, delay, period);  

And other:

while(needToDisplayData)
{
    displayData(); // display the data
    Thread.sleep(10000); // sleep for 10 seconds
}   

Both of them doesn’t work (application is force closed). What other options I can try?

Answer 1

You code is failed because you perform sleep in background thread but display data must be performed in UI thread.

You have to run displayData from runOnUiThread(Runnable) or define handler and send message to it.

for example:

(new Thread(new Runnable()
        {

            @Override
            public void run()
            {
                while (!Thread.interrupted())
                    try
                    {
                        Thread.sleep(1000);
                        runOnUiThread(new Runnable() // start actions in UI thread
                        {

                            @Override
                            public void run()
                            {
                                displayData(); // this action have to be in UI thread
                            }
                        });
                    }
                    catch (InterruptedException e)
                    {
                        // ooops
                    }
            }
        })).start(); // the while thread will start in BG thread