Re: [android-developers] Re: Handler.postDelayed not working when screen goes off

[Paul Townsend]

:) yeah I find the emulator slow its just easier with a phone.

On 29 November 2010 11:39, Evi Song  wrote:

> Thank you all for the discussion which saves my investigation.
> I was using the Handler.postDelayed() with something like a
> AlarmRunner to make a count down. Then I get the same problem that,
> handler paused when my phone standby.
> I'll switch to AlarmManager instead according to your suggestions.
>
> Btw, seems it's really important for Android developers to get a real
> phone for testing. Emulator is just emulator...
>
> On Nov 29, 1:31 am, Kostya Vasilyev  wrote:
> > Paul,
> >
> > You don't need a Service or a Handler to handle events from Alarm
> > Manager - just a Broadcast Receiver. It's even better, in that Android
> > guarantees to hold a wake lock for the duration of your receiver's
> > onReceive.
> >
> > -- Kostya
> >
> > 28.11.2010 18:59, Paul Townsend ?:
> >
> >
> >
> >
> >
> > > Hi guys thx for your help, been playing around with it and I tried
> > > setting up a service which works, but this will run in the background
> > > all the time so if I use an alarm manager how accurate is it can you
> > > set one for say 30 seconds time, or is it still bad to use a service
> > > even though all its doing is waiting for handler.post() to come along
> > > to play a sound. The timer is designed to have several times per timer
> > > so each timer will finish several times, i.e pyramid splits, and can
> > > have many timers
> >
> > > On 21 November 2010 23:30, Dianne Hackborn  > > > wrote:
> >
> > > You don't need to try around with different things, the behavior
> > > is very well defined: if you are not holding a wake lock, the CPU
> > > is allowed to go to full sleep, so no code can be executed until
> > > an external event wakes it up.  A thread sitting there waiting on
> > > a timer is never an external event.
> >
> > > If you need to make sure you wake up even if the CPU is asleep,
> > > use the AlarmManager.
> >
> > > On Sun, Nov 21, 2010 at 8:21 AM, Paul Townsend  > > > wrote:
> >
> > > Just tried that bvut dose the same thing, although I have used
> > > countdownTimer in a custom TextView that I wrote so I could
> > > have a countdown timer for the UI and this dose not pause. I
> > > might look into to transfering the other timer bits to the
> > > text view and use that as a all in one timer solution and see
> > > if that works.
> >
> > > On 21 November 2010 03:34, Hal  > > > wrote:
> >
> > > You may want to look at CountDownTime also. It seems to
> > > work fine
> > > (even when the Screen goes off).
> > > I  took the following from the web:
> >
> > >public class MyCount extends CountDownTimer {
> > >public MyCount(long millisInFuture, long
> > > countDownInterval) {
> > >  super(millisInFuture, countDownInterval);
> > >}
> >
> > >public void onFinish() {
> > >  counter = new MyCount(5000, 1000);
> > >  counter.start ();
> > >}
> >
> > >public void onTick(long millisUntilFinished) {
> > >tv.setText("Hal:" + timer.getTime());
> > >}
> > >}
> >
> > > The timer component uses a "Live" Jt component (separate
> > > thread):
> >
> > >private void timer() {
> >
> > >JtFactory main = new JtFactory ();
> >
> > >// Create the component
> >
> > >timer = (Timer) main.createObject
> (Timer.JtCLASS_NAME);
> >
> > >// Asynchronous processing of messages.
> > >main.setSynchronous(false);
> > >main.sendMessage (timer, new JtMessage
> > > (Timer.UPDATE_TIME));
> >
> > >}
> >
> > >.
> > >counter = new MyCount(5000, 1000);
> > >counter.start();
> > >setContentView(tv);
> > >...
> >
> > > On Nov 20, 3:58 pm, Paul Townsend  > > > wrote:
> > > > I made a simple countdown timer and it works as expected
> > > when plugged
> > > > in via usb for debugging but when I take it off
> > > debugging and the
> > > > screen goes off either time out or power button the
> > > handler fails to
> > > > fire at the end time. I have created a custom timer
> > > class that gets
> > > > created from the main activity when needed, because its
> > > able to have
> > > > multiple co

Re: [android-developers] Re: Handler.postDelayed not working when screen goes off

[Paul Townsend]

:) this programing lark is fun isn't it, I will try the alarm thing next :).
On 28 Nov 2010 17:32, "Kostya Vasilyev"  wrote:

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Re: [android-developers] Re: Handler.postDelayed not working when screen goes off

[Kostya Vasilyev]

Paul,

You don't need a Service or a Handler to handle events from Alarm 
Manager - just a Broadcast Receiver. It's even better, in that Android 
guarantees to hold a wake lock for the duration of your receiver's 
onReceive.


-- Kostya

28.11.2010 18:59, Paul Townsend ?:
Hi guys thx for your help, been playing around with it and I tried 
setting up a service which works, but this will run in the background 
all the time so if I use an alarm manager how accurate is it can you 
set one for say 30 seconds time, or is it still bad to use a service 
even though all its doing is waiting for handler.post() to come along 
to play a sound. The timer is designed to have several times per timer 
so each timer will finish several times, i.e pyramid splits, and can 
have many timers


On 21 November 2010 23:30, Dianne Hackborn > wrote:


You don't need to try around with different things, the behavior
is very well defined: if you are not holding a wake lock, the CPU
is allowed to go to full sleep, so no code can be executed until
an external event wakes it up.  A thread sitting there waiting on
a timer is never an external event.

If you need to make sure you wake up even if the CPU is asleep,
use the AlarmManager.

On Sun, Nov 21, 2010 at 8:21 AM, Paul Townsend mailto:deer...@gmail.com>> wrote:

Just tried that bvut dose the same thing, although I have used
countdownTimer in a custom TextView that I wrote so I could
have a countdown timer for the UI and this dose not pause. I
might look into to transfering the other timer bits to the
text view and use that as a all in one timer solution and see
if that works.


On 21 November 2010 03:34, Hal mailto:dsheppar...@gmail.com>> wrote:

You may want to look at CountDownTime also. It seems to
work fine
(even when the Screen goes off).
I  took the following from the web:

   public class MyCount extends CountDownTimer {
   public MyCount(long millisInFuture, long
countDownInterval) {
 super(millisInFuture, countDownInterval);
   }

   public void onFinish() {
 counter = new MyCount(5000, 1000);
 counter.start ();
   }

   public void onTick(long millisUntilFinished) {
   tv.setText("Hal:" + timer.getTime());
   }
   }


The timer component uses a "Live" Jt component (separate
thread):

   private void timer() {

   JtFactory main = new JtFactory ();


   // Create the component

   timer = (Timer) main.createObject (Timer.JtCLASS_NAME);

   // Asynchronous processing of messages.
   main.setSynchronous(false);
   main.sendMessage (timer, new JtMessage
(Timer.UPDATE_TIME));


   }


   .
   counter = new MyCount(5000, 1000);
   counter.start();
   setContentView(tv);
   ...

On Nov 20, 3:58 pm, Paul Townsend mailto:deer...@gmail.com>> wrote:
> I made a simple countdown timer and it works as expected
when plugged
> in via usb for debugging but when I take it off
debugging and the
> screen goes off either time out or power button the
handler fails to
> fire at the end time. I have created a custom timer
class that gets
> created from the main activity when needed, because its
able to have
> multiple countdowns running at the same time. Am I right
in thinking
> that the handler just gets paused when the screen goes
off and if so
> what are my alternatives. The activity is still in the
foreground and
> I assumed the handler would still fire if the screen
goes off.

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Re: [android-developers] Re: Handler.postDelayed not working when screen goes off

[Paul Townsend]

Hi guys thx for your help, been playing around with it and I tried setting
up a service which works, but this will run in the background all the time
so if I use an alarm manager how accurate is it can you set one for say 30
seconds time, or is it still bad to use a service even though all its doing
is waiting for handler.post() to come along to play a sound. The timer is
designed to have several times per timer so each timer will finish several
times, i.e pyramid splits, and can have many timers

On 21 November 2010 23:30, Dianne Hackborn  wrote:

> You don't need to try around with different things, the behavior is very
> well defined: if you are not holding a wake lock, the CPU is allowed to go
> to full sleep, so no code can be executed until an external event wakes it
> up.  A thread sitting there waiting on a timer is never an external event.
>
> If you need to make sure you wake up even if the CPU is asleep, use the
> AlarmManager.
>
> On Sun, Nov 21, 2010 at 8:21 AM, Paul Townsend  wrote:
>
>> Just tried that bvut dose the same thing, although I have used
>> countdownTimer in a custom TextView that I wrote so I could have a countdown
>> timer for the UI and this dose not pause. I might look into to transfering
>> the other timer bits to the text view and use that as a all in one timer
>> solution and see if that works.
>>
>>
>> On 21 November 2010 03:34, Hal  wrote:
>>
>>> You may want to look at CountDownTime also. It seems to work fine
>>> (even when the Screen goes off).
>>> I  took the following from the web:
>>>
>>>public class MyCount extends CountDownTimer {
>>>public MyCount(long millisInFuture, long countDownInterval) {
>>>  super(millisInFuture, countDownInterval);
>>>}
>>>
>>>public void onFinish() {
>>>  counter = new MyCount(5000, 1000);
>>>  counter.start ();
>>>}
>>>
>>>public void onTick(long millisUntilFinished) {
>>>tv.setText("Hal:" + timer.getTime());
>>>}
>>>}
>>>
>>>
>>> The timer component uses a "Live" Jt component (separate thread):
>>>
>>>private void timer() {
>>>
>>>JtFactory main = new JtFactory ();
>>>
>>>
>>>// Create the component
>>>
>>>timer = (Timer) main.createObject (Timer.JtCLASS_NAME);
>>>
>>>// Asynchronous processing of messages.
>>>main.setSynchronous(false);
>>>main.sendMessage (timer, new JtMessage (Timer.UPDATE_TIME));
>>>
>>>
>>>}
>>>
>>>
>>>.
>>>counter = new MyCount(5000, 1000);
>>>counter.start();
>>>setContentView(tv);
>>>...
>>>
>>> On Nov 20, 3:58 pm, Paul Townsend  wrote:
>>> > I made a simple countdown timer and it works as expected when plugged
>>> > in via usb for debugging but when I take it off debugging and the
>>> > screen goes off either time out or power button the handler fails to
>>> > fire at the end time. I have created a custom timer class that gets
>>> > created from the main activity when needed, because its able to have
>>> > multiple countdowns running at the same time. Am I right in thinking
>>> > that the handler just gets paused when the screen goes off and if so
>>> > what are my alternatives. The activity is still in the foreground and
>>> > I assumed the handler would still fire if the screen goes off.
>>>
>>> --
>>> You received this message because you are subscribed to the Google
>>> Groups "Android Developers" group.
>>> To post to this group, send email to android-developers@googlegroups.com
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>>> android-developers+unsubscr...@googlegroups.com
>>> For more options, visit this group at
>>> http://groups.google.com/group/android-developers?hl=en
>>>
>>
>>  --
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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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>

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Re: [android-developers] Re: Handler.postDelayed not working when screen goes off

[Dianne Hackborn]

You don't need to try around with different things, the behavior is very
well defined: if you are not holding a wake lock, the CPU is allowed to go
to full sleep, so no code can be executed until an external event wakes it
up.  A thread sitting there waiting on a timer is never an external event.

If you need to make sure you wake up even if the CPU is asleep, use the
AlarmManager.

On Sun, Nov 21, 2010 at 8:21 AM, Paul Townsend  wrote:

> Just tried that bvut dose the same thing, although I have used
> countdownTimer in a custom TextView that I wrote so I could have a countdown
> timer for the UI and this dose not pause. I might look into to transfering
> the other timer bits to the text view and use that as a all in one timer
> solution and see if that works.
>
>
> On 21 November 2010 03:34, Hal  wrote:
>
>> You may want to look at CountDownTime also. It seems to work fine
>> (even when the Screen goes off).
>> I  took the following from the web:
>>
>>public class MyCount extends CountDownTimer {
>>public MyCount(long millisInFuture, long countDownInterval) {
>>  super(millisInFuture, countDownInterval);
>>}
>>
>>public void onFinish() {
>>  counter = new MyCount(5000, 1000);
>>  counter.start ();
>>}
>>
>>public void onTick(long millisUntilFinished) {
>>tv.setText("Hal:" + timer.getTime());
>>}
>>}
>>
>>
>> The timer component uses a "Live" Jt component (separate thread):
>>
>>private void timer() {
>>
>>JtFactory main = new JtFactory ();
>>
>>
>>// Create the component
>>
>>timer = (Timer) main.createObject (Timer.JtCLASS_NAME);
>>
>>// Asynchronous processing of messages.
>>main.setSynchronous(false);
>>main.sendMessage (timer, new JtMessage (Timer.UPDATE_TIME));
>>
>>
>>}
>>
>>
>>.
>>counter = new MyCount(5000, 1000);
>>counter.start();
>>setContentView(tv);
>>...
>>
>> On Nov 20, 3:58 pm, Paul Townsend  wrote:
>> > I made a simple countdown timer and it works as expected when plugged
>> > in via usb for debugging but when I take it off debugging and the
>> > screen goes off either time out or power button the handler fails to
>> > fire at the end time. I have created a custom timer class that gets
>> > created from the main activity when needed, because its able to have
>> > multiple countdowns running at the same time. Am I right in thinking
>> > that the handler just gets paused when the screen goes off and if so
>> > what are my alternatives. The activity is still in the foreground and
>> > I assumed the handler would still fire if the screen goes off.
>>
>> --
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>> Groups "Android Developers" group.
>> To post to this group, send email to android-developers@googlegroups.com
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>> android-developers+unsubscr...@googlegroups.com
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>>
>
>  --
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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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Re: [android-developers] Re: Handler.postDelayed not working when screen goes off

[Paul Townsend]

Just tried that bvut dose the same thing, although I have used
countdownTimer in a custom TextView that I wrote so I could have a countdown
timer for the UI and this dose not pause. I might look into to transfering
the other timer bits to the text view and use that as a all in one timer
solution and see if that works.

On 21 November 2010 03:34, Hal  wrote:

> You may want to look at CountDownTime also. It seems to work fine
> (even when the Screen goes off).
> I  took the following from the web:
>
>public class MyCount extends CountDownTimer {
>public MyCount(long millisInFuture, long countDownInterval) {
>  super(millisInFuture, countDownInterval);
>}
>
>public void onFinish() {
>  counter = new MyCount(5000, 1000);
>  counter.start ();
>}
>
>public void onTick(long millisUntilFinished) {
>tv.setText("Hal:" + timer.getTime());
>}
>}
>
>
> The timer component uses a "Live" Jt component (separate thread):
>
>private void timer() {
>
>JtFactory main = new JtFactory ();
>
>
>// Create the component
>
>timer = (Timer) main.createObject (Timer.JtCLASS_NAME);
>
>// Asynchronous processing of messages.
>main.setSynchronous(false);
>main.sendMessage (timer, new JtMessage (Timer.UPDATE_TIME));
>
>
>}
>
>
>.
>counter = new MyCount(5000, 1000);
>counter.start();
>setContentView(tv);
>...
>
> On Nov 20, 3:58 pm, Paul Townsend  wrote:
> > I made a simple countdown timer and it works as expected when plugged
> > in via usb for debugging but when I take it off debugging and the
> > screen goes off either time out or power button the handler fails to
> > fire at the end time. I have created a custom timer class that gets
> > created from the main activity when needed, because its able to have
> > multiple countdowns running at the same time. Am I right in thinking
> > that the handler just gets paused when the screen goes off and if so
> > what are my alternatives. The activity is still in the foreground and
> > I assumed the handler would still fire if the screen goes off.
>
> --
> You received this message because you are subscribed to the Google
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> To unsubscribe from this group, send email to
> android-developers+unsubscr...@googlegroups.com
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>

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