Question

Here’s my app layout.

    MainActivity
    |
    Service
    |__Handler
       |__Runnable

In the Runnable I retrieve a String from the internet. It’s small enough to fit in an intent, if that matters.
I want to pass the String all the way back to MainActivity and notify it that it has been updated.

How can I do this?

Answer 1

Two methods:

1. Make a broadcast from Runnable
2. Start the MainActivity from Runnable

Both require to put the result as String Extra, in the Intent.

I suppose your Handler and Runnable are inline-class under Service, so you can have access to the Context. If not, you have to pass the Service Context to those classes.

> There seem to be some scope issues.

Nope, any class can call Context.sendBroadcast or Context.startActivity, and it does not require to be done on the Main Thread.