Hi,
  what is a good way to signal an error from a thread that is not the UI
thread and you don't know which activity/handler is currently active? Can I
somehow get eleto the current UI thread?

  Can I somehow use the MainLooper from the application context?

  I use notification for serious events where the user needs to take action,
e.g. a login failed, but here I am looking for a transient notification with
a toast and it would be ok if the toast is not seen in some cases.

Cheers,
Mariano

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