How To Change UI From A Separate Thread

Doing some simple android networking. My problem is as stated above, i would like to change the UI from a separate thread.

What i would like to do is add "Client successfully connected" to the EditText i have. The connection to the server is handled by a separate thread, and that is why i would like to do this. Another reason is, i have a different thread always listening for to what the server says, and what ever the server does say i would like to show it in the EditText.

I always get the following error:

Only the original thread that created a view hierarchy can touch its views

Ran into another problem. My code involves socket connections. It works just fine on the emulator. How ever it doesn't work on my phone. It was working a day or two ago, then just magically stopped. LogCat simply says permission denied.