I answered you but I don't see my message.. I hope it's OK :s
On 29 déc, 03:22, Dianne Hackborn <hack...@android.com> wrote:
> This will run the CPU at 100%. With the screen off, this will tremendously
> impact battery life. With it on, it will be at least noticeable.
>
> How accurate do you need to be? Have you tried other approaches such as
> posting messages at a time? What priority are you running your timing
> thread at (priority would be the first thing I look at when it comes to
> accuracy).
>
>
>
> On Tue, Dec 28, 2010 at 4:06 AM, Slash4 <alex.cen...@gmail.com> wrote:
> > Hi,
>
> > I'm working on a metronome application, so I need a rather accurate
> > time-measuring system to fire the metronome sound at the right time.
> > Actually I found a solution, but I'm wondering if my method will not
> > be cpu consuming. Here is the code snippet :
>
> > t = new Thread() {
> > public void run() {
>
> > long neededTime = 0;
> > while(isRunning){
>
> > long curTime = SystemClock.uptimeMillis();
>
> > if(curTime>=neededTime){
>
> > neededTime = curTime + (60000/tempo);
> > playSound(clickSoundId,100);
>
> > incrementBeat();
>
> > mHandler.post(mUpdateUi);
> > }
> > }
> > }
> > };
> > t.setDaemon(true);
> > t.start();
>
> > You can see I set up a semi-infinite loop with rather frequent
> > accesses to uptimeMillis() . I chose this method after having some
> > issues with sleep() which is not accurate enough. When I want to stop
> > the metronome, I just have to set isRunning to false.
>
> > How can I evaluate the impact of this on CPU and battery ?
>
> > Thanks a lot.
> > Rgds, Alex
>
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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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