In same cases Android studio displays warning message when I call observe
method of LiveData
object
viewModel.emailValidationResult.observe(viewLifecycleOwner, {onEmailChanged(it)})
Candidate resolution will be changed soon, please use fully qualified name to invoke the following closer candidate explicitly:
public open fun observe(owner: LifecycleOwner, observer: Observer<in Int?>): Unit defined in androidx.lifecycle.LiveData
As I understand it's happened after updating kotlin 1.4 What does it actually mean ?
This function is deprecated. This extension method is not required when using Kotlin 1.4.
MutableLiveData is just a class that extends the LiveData type class. MutableLiveData is commonly used since it provides the postValue() , setValue() methods publicly, something that LiveData class doesn't provide.
LiveData is an observable data holder class. Unlike a regular observable, LiveData is lifecycle-aware, meaning it respects the lifecycle of other app components, such as activities, fragments, or services. This awareness ensures LiveData only updates app component observers that are in an active lifecycle state.
It means that the extension in androidx is not needed anymore.
Simply remove its import import androidx.lifecycle.observe
.
It will be actually deprecated in androidx. Read more reasoning there.
EDIT:
Please note the "issue" from Erik Hoogendoorn
This change causes values from the observed LiveData object to be interpreted as nullable(since the converted lambda syntax is based on nullable Java code). This was not the case for the Kotlin extension and causes a loss in functionality for the user. In my opinion this change should be reverted and a different solution found.
I'm curious if they will rename & retain the helper or come up with another solution.
AndroidX extension is deprecated, so we have to use the original one.
Remove import androidx.lifecycle.observe
then
viewModel.liveData.observe(viewLifecycleOwner, Observer { result -> })
or
viewModel.liveData.observe(viewLifecycleOwner) { result -> }
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