LiveData 와 MutableLiveData 차이강의중에서

Question

늘 수고많으신 개복치강사님 24년 갑진년에도 건강하시고 부자되세여 viewModel = ViewModelProvider(this).get(MainViewModel:: class.java ) 위 코드에서 아래와 같은 오류가 발생하네요 Type mismatch: inferred type is MainViewModel but ViewModel was expected

shafeel2 · Answer

해당코드를 viewModel = ViewModelProvider(this)[MainViewModel:: class. java ] 로 변경하니 오류가 사라지네요 캄사합니다

shafeel2 · Answer

github 주소 올려두었습니다

shafeel2 · Answer

github 주소입니당 https://github.com/dongguntechnology/ViewModelMutableLiveData

shafeel2 · Answer

class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)

viewModel = ViewModelProvider(this).get(MainViewModel::class.java)

findViewById<Button>(R.id.btnArea).setOnClickListener {
viewModel.plusLiveDataValue()
}

viewModel.testLiveData.observe(this, Observer {
findViewById<TextView>(R.id.textArea).text = it.toString()
})
}
}

shafeel2 · Answer

class MainViewModel {
private var testMutableLiveData = MutableLiveData(0)

val testLiveData : LiveData<Int> get() = testMutableLiveData

fun plusLiveDataValue(){
_testMutableLiveData.value = _testMutableLiveData.value!!.plus(1)
}

}