Example, If I replaced 'fragmentA' with 'fragmentB', the 'viewModelA' of fragmentA is still live. why ?
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
viewModel = ViewModelProvider.NewInstanceFactory().create(InvoicesViewModel::class.java)
}
class InvoicesViewModel : ViewModel() {
init {
getInvoices()
}
private fun getInvoices() {
viewModelScope.launch {
val response = safeApiCall() {
// Call API here
}
while (true) {
delay(1000)
println("Still printing although the fragment of this viewModel destroied")
}
if (response is ResultWrapper.Success) {
// Do work here
}
}
}
}
fun replaceFragment(activity: Context, fragment: Fragment, TAG: String) {
val myContext = activity as AppCompatActivity
val transaction = myContext.supportFragmentManager.beginTransaction()
transaction.replace(R.id.content_frame, fragment, TAG)
transaction.commitNow()
}
You will note the while loop inside the Coroutine still work although after replace fragment to another fragment.
this is about your implementation of ViewModelProvider
. use this way for creating your viewModel.
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
viewModel = ViewModelProvider(this).get(InvoicesViewModel::class.java)
}
in this way you give your fragment as live scope of view model.
检查您是否在 Activity 中创建了 ViewModel 并传递了 Activity 或 Fragment 的上下文。
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