Accessing UI thread handler from a service

Question

I am trying some thing new on Android for which I need to access the handler of the UI thread.

I know the following:

1. The UI thread has its own handler

Answer 1

This snippet of code constructs a Handler associated with the main (UI) thread:

Handler handler = new Handler(Looper.getMainLooper());

You can then post stuff for execution in the main (UI) thread like so:

handler.post(runnable_to_call_from_main_thread);

If the handler itself is created from the main (UI) thread the argument can be omitted for brevity:

Handler handler = new Handler();

The Android Dev Guide on processes and threads has more information.