Why does my activity doesn't see an observed object change?

Question

I\'m new to Android development and i am trying to understand Live Data with MVVM architecture. I am trying to make the main activity recognize when there is a change in an obje

Answer 1

here your problem is with repository code inside repository you are creating new object of mutable live data and observing different one.

Interface Callback{
    onSuccess(String response)
    onError(String error)
}

public void login(String username , String hashedPassword,Callback callback){
    final MutableLiveData loggedInUser = new MutableLiveData<>();
    User user = new User(username,hashedPassword);

    usersRepositoryApi.login(user).enqueue(new Callback() {
        @Override
        public void onResponse(Call call, Response response) {
            if (response.isSuccessful()) {
                callback.onSuccess(response.body());
            }
        }

        @Override
        public void onFailure(Call call, Throwable t) {
            callback.onError(null);
        }
    });
}

//login method of your viewmodel 
public void login(String userName , String hashedPassword) {
     usersRepository.login(userName, hashedPassword,new Callback(){
          void onSuccess(String responsebody){
               loggedInUser.setValue(responsebody);
          }

          void onError(String error){
               loggedInUser.setValue(responsebody);
          }
     });
}