[android-developers] Re: Threading and Message Loops
I replaced my threading code with the AsyncTask, and its such a direct
solution for my issue that I don't need to post my code. The
references listed above provided all the solutions. Also, the
stacktrace also seemed to be caused by the reason stated above because
it too went away with this solution. Thanks again!
On May 13, 1:37 pm, radarcg wrote:
> Thanks to you both for this information, it sounds like its exactly
> what I was looking for. It is appreciated, thanks for your
> contributions to the community. I'll pay back by posting results...
>
> On May 12, 6:41 pm, Dianne Hackborn wrote:
>
>
>
> > The error means that this Message object has already been posted to a
> > queue. It probably means that somewhere you are keeping a Message that you
> > received from a Handler (the Handler owns the message and will recycle it
> > when returning from your code), or otherwise cause a Message to get recycled
> > that is also being posted into a Handler.
>
> > On Tue, May 12, 2009 at 6:04 PM,radarcg wrote:
>
> > > Ok, I'm really struggling with what is likely a simple issue. All I
> > > really want to do is have an activity spawn a thread to do a non-
> > > trivial action (for now, just testing with sleep(5000) ). Then, when
> > > that non-trivial action completes, the thread should notify the
> > > activity, and the activity should present something visual, and
> > > proceed. Simple enough right? I'm trying to use a Handler subclass to
> > > which I send messages using sendMessage(). That handler subclass with
> > > then notify the activity. It all seems to work actually, but then when
> > > the thread completes, android is throwing an unhelpful exception:
>
> > > 05-13 00:58:14.476: ERROR/JavaBinder(1073): *** Uncaught remote
> > > exception! (Exceptions are not yet supported across processes.)
> > > 05-13 00:58:14.476: ERROR/JavaBinder(1073):
> > > android.util.AndroidRuntimeException: { what=1004 when=4149225
> > > arg2=1 } This message is already in use.
> > > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > > android.os.MessageQueue.enqueueMessage(MessageQueue.java:173)
> > > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > > android.os.Handler.sendMessageAtTime(Handler.java:457)
> > > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > > android.os.Handler.sendMessageDelayed(Handler.java:430)
> > > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > > android.os.Handler.sendMessage(Handler.java:367)
> > > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > > android.view.ViewRoot.windowFocusChanged(ViewRoot.java:2421)
> > > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > > android.view.ViewRoot$W.windowFocusChanged(ViewRoot.java:2594)
> > > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at android.view.IWindow
> > > $Stub.onTransact(IWindow.java:166)
> > > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > > android.os.Binder.execTransact(Binder.java:287)
> > > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > > dalvik.system.NativeStart.run(Native Method)
>
> > > As a seasoned Java developer, running into trouble like this so early
> > > in a new project is frustrating. However, I believe in Android and the
> > > broader Google development platforms, so I'd really like to solve
> > > this, but I think I need the communities help. Even just some sample
> > > code (skeleton apps) that demo some best practices regarding the
> > > threading (such as usage of HandlerThread and Looper) would be a big
> > > help.
>
> > > Thanks,
>
> > > Charles
>
> > --
> > 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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[android-developers] Re: Threading and Message Loops
Thanks to you both for this information, it sounds like its exactly
what I was looking for. It is appreciated, thanks for your
contributions to the community. I'll pay back by posting results...
On May 12, 6:41 pm, Dianne Hackborn wrote:
> The error means that this Message object has already been posted to a
> queue. It probably means that somewhere you are keeping a Message that you
> received from a Handler (the Handler owns the message and will recycle it
> when returning from your code), or otherwise cause a Message to get recycled
> that is also being posted into a Handler.
>
>
>
>
>
> On Tue, May 12, 2009 at 6:04 PM, radarcg wrote:
>
> > Ok, I'm really struggling with what is likely a simple issue. All I
> > really want to do is have an activity spawn a thread to do a non-
> > trivial action (for now, just testing with sleep(5000) ). Then, when
> > that non-trivial action completes, the thread should notify the
> > activity, and the activity should present something visual, and
> > proceed. Simple enough right? I'm trying to use a Handler subclass to
> > which I send messages using sendMessage(). That handler subclass with
> > then notify the activity. It all seems to work actually, but then when
> > the thread completes, android is throwing an unhelpful exception:
>
> > 05-13 00:58:14.476: ERROR/JavaBinder(1073): *** Uncaught remote
> > exception! (Exceptions are not yet supported across processes.)
> > 05-13 00:58:14.476: ERROR/JavaBinder(1073):
> > android.util.AndroidRuntimeException: { what=1004 when=4149225
> > arg2=1 } This message is already in use.
> > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > android.os.MessageQueue.enqueueMessage(MessageQueue.java:173)
> > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > android.os.Handler.sendMessageAtTime(Handler.java:457)
> > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > android.os.Handler.sendMessageDelayed(Handler.java:430)
> > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > android.os.Handler.sendMessage(Handler.java:367)
> > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > android.view.ViewRoot.windowFocusChanged(ViewRoot.java:2421)
> > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > android.view.ViewRoot$W.windowFocusChanged(ViewRoot.java:2594)
> > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at android.view.IWindow
> > $Stub.onTransact(IWindow.java:166)
> > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > android.os.Binder.execTransact(Binder.java:287)
> > 05-13 00:58:14.476: ERROR/JavaBinder(1073): at
> > dalvik.system.NativeStart.run(Native Method)
>
> > As a seasoned Java developer, running into trouble like this so early
> > in a new project is frustrating. However, I believe in Android and the
> > broader Google development platforms, so I'd really like to solve
> > this, but I think I need the communities help. Even just some sample
> > code (skeleton apps) that demo some best practices regarding the
> > threading (such as usage of HandlerThread and Looper) would be a big
> > help.
>
> > Thanks,
>
> > Charles
>
> --
> 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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[android-developers] Threading and Message Loops
Ok, I'm really struggling with what is likely a simple issue. All I
really want to do is have an activity spawn a thread to do a non-
trivial action (for now, just testing with sleep(5000) ). Then, when
that non-trivial action completes, the thread should notify the
activity, and the activity should present something visual, and
proceed. Simple enough right? I'm trying to use a Handler subclass to
which I send messages using sendMessage(). That handler subclass with
then notify the activity. It all seems to work actually, but then when
the thread completes, android is throwing an unhelpful exception:
05-13 00:58:14.476: ERROR/JavaBinder(1073): *** Uncaught remote
exception! (Exceptions are not yet supported across processes.)
05-13 00:58:14.476: ERROR/JavaBinder(1073):
android.util.AndroidRuntimeException: { what=1004 when=4149225
arg2=1 } This message is already in use.
05-13 00:58:14.476: ERROR/JavaBinder(1073): at
android.os.MessageQueue.enqueueMessage(MessageQueue.java:173)
05-13 00:58:14.476: ERROR/JavaBinder(1073): at
android.os.Handler.sendMessageAtTime(Handler.java:457)
05-13 00:58:14.476: ERROR/JavaBinder(1073): at
android.os.Handler.sendMessageDelayed(Handler.java:430)
05-13 00:58:14.476: ERROR/JavaBinder(1073): at
android.os.Handler.sendMessage(Handler.java:367)
05-13 00:58:14.476: ERROR/JavaBinder(1073): at
android.view.ViewRoot.windowFocusChanged(ViewRoot.java:2421)
05-13 00:58:14.476: ERROR/JavaBinder(1073): at
android.view.ViewRoot$W.windowFocusChanged(ViewRoot.java:2594)
05-13 00:58:14.476: ERROR/JavaBinder(1073): at android.view.IWindow
$Stub.onTransact(IWindow.java:166)
05-13 00:58:14.476: ERROR/JavaBinder(1073): at
android.os.Binder.execTransact(Binder.java:287)
05-13 00:58:14.476: ERROR/JavaBinder(1073): at
dalvik.system.NativeStart.run(Native Method)
As a seasoned Java developer, running into trouble like this so early
in a new project is frustrating. However, I believe in Android and the
broader Google development platforms, so I'd really like to solve
this, but I think I need the communities help. Even just some sample
code (skeleton apps) that demo some best practices regarding the
threading (such as usage of HandlerThread and Looper) would be a big
help.
Thanks,
Charles
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