grape

private var _value = MutableLiveData() val value: LiveData get() = _value @={viewmodel.value} solution var value = MutableLiveData() @={viewmodel.value} or private var _value = MutableLiveData() val value: LiveData get() = _value private var value = MutableLiveData() @={viewmodel.value.member} Sample/app/build/generated/ap_generated_sources/debug/out/com/test/testapp/DataBinderMapperImpl.java:9:..

viewmodel binding 할 때 필요한 implementation implementation 'androidx.activity:activity-ktx:1.2.0' import androidx.activity.viewModels private val viewmodel : MainViewModel by viewModels() ps activity-ktx 와 의존성이 있는 다른 *-ktx로 대체가 가능하다. implementation 'androidx.activity:*-ktx:1.2.0'

miss @JvmStatic miss match attribute miss match @BindingAdapter("text_num") miss match @InverseBindingAdapter(attribute = "text_num", event = "android:textAttrChanged") two-way-binding build message The expression 'viewmodelNum.getValue()' cannot be inverted, so it cannot be used in a two-way binding one-way-binding fatal message java.lang.RuntimeException: Unable to start activity ComponentInfo..

viewmodel private val _num = MutableLiveData(0) var num: LiveData = _num bindingadapter object CustomBindingAdapter{ @JvmStatic @BindingAdapter("text_int") fun setText(view: TextView, text: Int){ view.text = text.toString() } @JvmStatic @InverseBindingAdapter(attribute = "text_int", event = "android:textAttrChanged") fun getText(view: TextView): Int { return view.text.toString().toIntOrNull() ?:..

ViewModel class ViewModel() : ViewModel() { //EditText support String simple private val _text = MutableLiveData(String) val text: LiveData = _text //EditText not support Int need BindingAdapter private val _num = MutableLiveData(String) val num: LiveData = _num layout

databinding send view & BindingAdapter ViewModel class ViewModel() : ViewModel() { //If want update view data then use LiveData //EditText support String simple private val _text = MutableLiveData(String) val data: LiveData = _text //EditText not support Int Type need BindingAdapter private val _num = MutableLiveData(String) val num: LiveData = _num layout BindingAdapter object EditTextDataBindi..

simple data binding https://developer.android.com/jetpack/androidx/releases/databinding gradle android { ... buildFeatures { dataBinding true } } Activity //connect activity & binding & viewmodel class NameActivity : AppCompatActivity() { private val viewModel: ViewModel by viewModels() //auto generate ActivityNameBinding private lateinit var binding : ActivityNameBinding override fun onCreate(s..