ViewModelLiveDataExampleKT

LiveDataKTX

• Add dependencies on Gradle

implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0"
implementation "androidx.activity:activity-ktx:1.1.0"
implementation "androidx.fragment:fragment-ktx:1.2.5"

• Make Class MainVM.

classMainVM: ViewModel(){
val currentName:MutableLiveData<String> by lazy {
MutableLiveData<String>()
}
}

• Use ViewModel on activity

classMainActivity : AppCompatActivity() {
privatevalTAG="MainActivity"// Use the 'by viewModels()' Kotlin property delegate// from the activity-ktx artifactprivateval model:MainVM by viewModels()
overridefunonCreate(savedInstanceState:Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
model.currentName.value ="Hallo GZeinNumer"
model.currentName.observe(this, Observer {
Log.d(TAG, "onCreate: $it")
})
}
}

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Copyright 2020 M. Fadli Zein