34.3 Implementing the Observer

Now that the conversion result is contained within a LiveData instance, the next step is to configure an observer within the UI controller which, in this example, is the MainFragment class. Locate the MainFragment.java class (app -> java -> <package name> -> MainFragment), double-click on it to load it into the editor and modify the onActivityCreated() method to create a new Observer instance named resultObserver:

package com.ebookfrenzy.viewmodeldemo.ui.main;

 

import androidx.lifecycle.Observer;

.

.

@Override

public void onActivityCreated(@Nullable Bundle savedInstanceState) {

.

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    binding.resultText.setText(String.format(Locale.ENGLISH,"%.2f",

                               mViewModel.getResult()));

 

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