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I am trying to update the text in textview from SchedulerExecutiveService. But strangely, textview is updated only the first time and not after that.

ScheduledExecutorService textService = Executors.newScheduledThreadPool(1);
 textService.scheduleAtFixedRate(new Runnable() 
 @Override
 public void run() 
 Log.d("sg", "Logging Seconds");
 textStart.setText("Dyanamic text here.");
 
 , 0, 1, TimeUnit.SECONDS);

This code is working properly if I remove textStart.setText(..) part.

You can do this way:

public class MainActivity extends Activity 

 private TextView textStart;
 private int i= 0;

 @Override
 protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 textStart = (TextView)findViewById(R.id.textStart);

 ScheduledExecutorService textService = Executors.newScheduledThreadPool(1);
 textService.scheduleAtFixedRate(new Runnable() 
 @Override
 public void run() 
 Log.i("sg", "Logging Seconds");
 textStart.post(new Runnable() 
 @Override
 public void run() 
 i++;
 textStart.setText(""+i);
 
 );
 
 , 0, 1, TimeUnit.SECONDS);
 

It's working fine for me.

Wrap textStart.setText("Dyanamic text here."); line inside runOnUiThread because scheduleAtFixedRate Runnable called on background Thread from where not possible to access UI elements.

You must update your textview in runonUiThread.

I have used Timer to update my textview. Try this, it will help you.

new Timer().schedule(new TimerTask() 

 @Override
public void run() 

 mActivity.runOnUiThread(new Runnable() 

 @Override
 public void run() 
 // TODO Auto-generated method stub
 timertap.setText(timer_count + "");
 
 );


 
, 1000,1000);

I finally achieved the same result in a very light weight manner using Rx. Check the code below.

subscription = Observable
 .interval(0, 1, TimeUnit.SECONDS, Schedulers.io())
 .observeOn(AndroidSchedulers.mainThread())
 .subscribe(new Observer<Long>() 
 @Override
 public void onCompleted() 

 

 @Override
 public void onError(Throwable e) 

 

 @Override
 public void onNext(Long aLong) 
 int millis = mediaPlayer.getCurrentPosition();
 String time = String.format("%d:%d sec",
 TimeUnit.MILLISECONDS.toMinutes(millis),
 TimeUnit.MILLISECONDS.toSeconds(millis) -
 TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis))
 );
 textStart.setText(time);
 
 );