This answer is true and correct, but could have used a little more
explanation. The Timer class is included because it is expected in Java.
But it is not particularly suitable for the way tasks and processes should
be handled on an Android phone. Handler is. The OP can define an arbitrary
message and get the effect of a timer by posting the message to the
pre-existing queue with sendMessageDelayed(arbitraryMessage,
timerInterval). Or if more convenient, instead of a message, put the
Runnable you want executed on the queue with postDelayed(Runnable). The
choice of which is best depends on your application's individual
circumstances, but I prefer the message approach, unless doing a splash
screen (for which see
http://stackoverflow.com/questions/5486789/how-do-i-make-a-splash-screen-in-android).
Now for 'suitable', what I mean is: if you (the OP) use the Message
approach, you do not have to define your own thread for the Timer, so you
sidestep all the issues of thread management, letting the system handle it.
See the class reference for Handler for details.
On Friday, March 23, 2012 1:33:19 PM UTC-7, Dianne Hackborn wrote:
>
> Handler.
>
> Just don't use Timer, Handler is the Android-centric mechanism.
>
> On Thu, Mar 22, 2012 at 10:53 PM, Perumss Naren <peru2...@gmail.com>wrote:
>
>> Hi ,
>>
>> which way is best in performance is Handler or timer i need
>> to update textview as timer every second need to update time so which one
>> will be best please tell the reason. because i need the reason thanks in
>> advance
>>
>> public void onCreate(Bundle savedInstanceState) {
>> super.onCreate(savedInstanceState);
>> setContentView(R.layout.main);
>>
>> timer = (TextView) findViewById(R.id.timer);
>>
>> // handler.post(mRunnable);
>> task = new UpdateTimeTask();
>> handler.post(task);
>> }
>>
>>
>> private Runnable mRunnable = new Runnable() {
>> @Override
>> public void run() {
>> timer.setText(dateFormat.format(new Date()));
>> handler.postDelayed(mRunnable, 1000);
>> }
>> };
>>
>> class UpdateTimeTask extends TimerTask {
>> public void run() {
>> timer.setText(dateFormat.format(new Date()));
>> handler.postDelayed(task, 1000);
>> }
>> }
>>
>>
>> --
>> Regards,
>>
>> Perumal.N
>>
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>
>
>
>
> --
> Dianne Hackborn
> Android framework engineer
> hack...@android.com
>
> Note: please don't send private questions to me, as I don't have time to
> provide private support, and so won't reply to such e-mails. All such
> questions should be posted on public forums, where I and others can see and
> answer them.
>
>
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