SomeActivity.scala

    val t = findViewById(R.id.textView1).asInstanceOf[TextView]
    val b = findViewById(R.id.button1).asInstanceOf[Button]
    b setOnClickListener {
      view: View =>
        backgroundThread {
          // Do things like network requests here in the background thread...
          Thread.sleep(3000)

          uiThread {
            // Back on the main thread, update the UI...
            t.setText("Done with async.")
          }

          // More background work...

          uiThread {
            // More main thread UI changes...
          }
        }
    }