This is my note for Udemy lesson: Advanced Android Bootcamp 2024.
1. Create ViewModel
Please check the previous note.
2. Edit ViewModel
class MainActivityViewModel: ViewModel() { private val _count = MutableLiveData(0) val count: LiveData<Int> get() = _count fun add() { _count.value = _count.value?.plus(1) } }
3. Edit onCreate() Function in MainActivity
override fun onCreate(savedInstanceState: Bundle?) { ... viewModel.count.observe(this, Observer { binding.countText.text = it.toString() }) viewModel.addButton.setOnclickListener { viewModel.add() } }