simple custom function to run on UI and background respectively

simpleExtensionFunctionUsage

//run this on default background thread
runOnDefaultThread({
    firstNote = NoteRepository.getOrCreateFirstNote(applicationContext)
    firstNoteLive = NoteRepository.getLiveDataNoteById(applicationContext, firstNote.id)
    
    //run on main thread
    runOnUiThread {
        firstNoteLive.observe(this, Observer<Note> {
            Log.v(TAG, "First note is changed, value: ${it.content}")
        })
    }
})