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Question 18 of 109

What is LiveData and how does it differ from Observable fields?

beginner
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LiveData is a lifecycle-aware observable data holder. Key differences from regular observables:

  • Lifecycle awareness: Only notifies active observers
  • Automatic cleanup: Removes observers when lifecycle is destroyed
  • No memory leaks: Automatically handles observer lifecycle
  • Main thread delivery: Updates always delivered on main thread
class UserViewModel : ViewModel() {
    private val _userName = MutableLiveData<String>()
    val userName: LiveData<String> = _userName
    
    // Observer only receives updates when in STARTED or RESUMED state
}
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