LiveData update on object field change

Question

I\'m using Android MVVM architecture with LiveData. I have an object like this

public class User {
    private String firstName;
    private String lastName;         


        

Answer 1

If you are using Kotlin and LiveData, I can offer you 2 ways - with and without extension fucntion:

Without extension function

liveData.value = liveData.value?.also { it ->
    // Modify your object here. Data will be auto-updated
    it.name = "Ed Khalturin"
    it.happyNumber = 42
}

Same, but with extension

// Extension. CopyPaste it anywhere in your project
fun  MutableLiveData.mutation(actions: (MutableLiveData) -> Unit) {
    actions(this)
    this.value = this.value
}

// Usage
liveData.mutation {
    it.value?.name = "Ed Khalturin"
    it.value?.innerClass?.city= "Moscow" // it works with inner class too
}