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

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