Invoke MutableLiveData Observer without using postValue()

Question

Suppose, I've a MutableLiveData<User>. So if I update a variable in User let say userName using the value like

var user = MutableLiveData<User>()
user.postValue(User())
user.value.userName = "ABC"

it won't call the observer. So I have to call a postValue to invoke it. Is there any to invoke observer after updating one property of MutableLiveData object.

Livedata working based on the object you specified, here it is User and based on the attributes of user object — Shalu T D
here you update the property of MutableLiveData not the User. You could do something like user.postValue(User().apply{userName = "ABC"}), or instantiate User( )before, modify the property and then post it — Stachu

Ashutosh Sagar Ashutosh Sagar · Accepted Answer · 2020-09-04T12:43:51

At the end @Stachu solution works but, I have made a change by passing the value of apply block in the postValue() like this -

user.postValue(user.value.apply{ userName = "abc" }.value)

Invoke MutableLiveData Observer without using postValue()

1 Answers