Do your work on the main thread, at least the stuff retrieving the bluetooth adapter. Is there a reason you are using AsyncTask for this anyway? Is there some long-running work you are also doing?
2011/4/20 b_t <[email protected]> > I don't know what firmware it is but when I updated my app today I got > tons of error mails from different types of devices so it must be a > popular one. > > On Apr 20, 4:17 pm, Kostya Vasilyev <[email protected]> wrote: > > Have you looked at Android's own Power Controls widget? It's part of > > Settings application. > > > > Also, is it possible you're dealing with some heavily modified, buggy > > firmware? > > 20.04.2011 18:00 пользователь "b_t" <[email protected]> написал:> > The original stack trace is: > > > > > Caused by: java.lang.RuntimeException: Can't create handler inside > > > thread that has not called Looper.prepare() > > > at android.os.Handler.<init>(Handler.java:121) > > > at android.bluetooth.BluetoothAdapter > > > $1.<init>(BluetoothAdapter.java:961) > > > at > > > android.bluetooth.BluetoothAdapter.<init>(BluetoothAdapter.java:961) > > > at > > > > > android.bluetooth.BluetoothAdapter.getDefaultAdapter(BluetoothAdapter.java: > > > > > > > > > 308) > > > *** myTask.doInBackground() *** > > > at android.os.AsyncTask$2.call(AsyncTask.java:185) > > > at java.util.concurrent.FutureTask > > > $Sync.innerRun(FutureTask.java:305) > > > at java.util.concurrent.FutureTask.run(FutureTask.java:137) > > > at > > > > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java: > > > 1068) > > > at java.util.concurrent.ThreadPoolExecutor > > > $Worker.run(ThreadPoolExecutor.java:561) > > > at java.lang.Thread.run(Thread.java:1102) > > > > > I try to explain what I want: > > > > > - I have an appwidget with a bluetooth toggle > > > - If the bluetooth state changes the appwidget will be updated > > > - If I click on the appwidget than I toggle bluetooth state > > > > > If I click on the toggle: > > > > > - an IntentService will be executed > > > - it creates a Handler and displays a toast by Handler.post() with the > > > message "turning off..." > > > - I change bluetooth state > > > - bluetooth state changes so my broadcast receiver tries to update > > > appwidget > > > > > If I update appwidget in a service than everything is ok except that > > > APN can occur if the > > > update process is slow for some reason. > > > > > I would like to put appwidget update mechanism into an AsyncTask. > > > But because of BluetoothAdapter.getDefaultAdapter creates a Handler > > > (in some roms) it throws > > > the exception above. > > > > > If I put Looper.prepare() in the begin of doInBackground, then the > > > following error occurs > > > for a thread (there are five asynctask thread in my device so it > > > happens very early) > > > > > java.lang.RuntimeException: Only one Looper may be created per > > > thread > > > > > If I use the following code: > > > > > Looper myLooper = Looper.myLooper(); > > > if (myLooper == null) { > > > Looper.prepare(); > > > } > > > > > than everything seems fine except one thing: to toast I would like to > > > display > > > in the beginning of the process will be displayed much time later. > > > > > I don't know why and how can I avoid it. > > > > > I hope somebody understand my problem and can give me a solution. > > > > > T. > > > > > On Apr 20, 10:17 am, Kostya Vasilyev <[email protected]> wrote: > > >> You could try calling Looper.prepare() first thing in > doInBackground(). > > > > >> Oh, and logcat output would help us help you, as usual. > > > > >> -- Kostya > > > > >> 20.04.2011 12:07, b_t пишет: > > > > >> > Hi, > > > > >> > In my app I was going to use an AsyncTask to update appwidget data > > >> > because this process can be long. To get the state I have to call > > >> > BluetoothAdapter.getDefaultAdapter(). The problem is that in some > > >> > device (not in mine) it tries to initialize a Handler and throws > > >> > Exception about > > >> > missing Looper. > > > > >> > I don't know what should I do. > > > > >> -- > > >> Kostya Vasilyev --http://kmansoft.wordpress.com > > > > > -- > > > You received this message because you are subscribed to the Google > > > Groups "Android Developers" group. > > > To post to this group, send email to > [email protected] > > > To unsubscribe from this group, send email to > > > [email protected] > > > For more options, visit this group at > > >http://groups.google.com/group/android-developers?hl=en > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- Dianne Hackborn Android framework engineer [email protected] 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. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
