Also, Romain posted a great blog article about AsyncTask just a few days ago:
http://android-developers.blogspot.com/2009/05/painless-threading.html j On Tue, May 12, 2009 at 6:07 PM, Jeff Sharkey <jshar...@android.com> wrote: > You should totally check out AsyncTask, it's designed for just this > scenario of doing things in a background thread. It can also handle > sending periodic progress updates to the UI: > > http://d.android.com/reference/android/os/AsyncTask.html > > j > > On Tue, May 12, 2009 at 6:04 PM, radarcg <rada...@gmail.com> 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 >> >> >> > > > > -- > Jeff Sharkey > jshar...@google.com > -- Jeff Sharkey jshar...@google.com --~--~---------~--~----~------------~-------~--~----~ 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 To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
