My guess? I'd guess that you're expecting it to immediately show up, and you're continuing to do something right afterwards.
It will not show up until after you exit from the method. Toast.show() queues up a request to show it, it doesn't actually do anything on the screen itself. (It can't). It's not until you return back to the event-handling loop that the toast can be shown. At least, that's the usual reason. Note that this is also true in an Activity. If you call show() in an activity, and follow it with Thread.sleep(60*1000), it won't show up until a minute later, after the sleep returns. By the way -- toast does not display IN an activity. It shows up IN FRONT OF an activity. That is, the activity is not affected, the toast is just in front of it briefly. In this case, the activity is not really involved at all. On Aug 11, 3:06 am, CaryWang <wangjf...@gmail.com> wrote: > I use Toast.makeText(getApplicationContext(), "test", > Toast.LENGTH_SHORT).show(); don't display in the Activity.why? > > 2010/8/11 Sarwar Erfan <erfanonl...@gmail.com> > > > Do you wan to display a Toast from a Service? You do not need any > > Activy to do so. > > A toast can be created and displayed from an Activity or Service. If > > you create a toast notification from a Service, it appears in front of > > the Activity currently in focus. > > > A Service is indirectly derived from Context. You have > > getApplicationContext() method in a service and you can use the > > returned Context in your Toast. > > > Have a look at this page: > >http://developer.android.com/guide/topics/ui/notifiers/toasts.html > > > Regards > > Sarwar Erfan > > > On Aug 11, 3:50 pm, CaryWang <wangjf...@gmail.com> wrote: > > > I run service in the background I want to use Toast.makeText display > > message > > > to run Activity.but I don't know Activity context I know Activity > > > packageName and className.What should I do? > > > > -- > > > Cary > > > -- > > 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<android-developers%2Bunsubs > > cr...@googlegroups.com> > > For more options, visit this group at > >http://groups.google.com/group/android-developers?hl=en > > -- > Cary -- 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
