https://github.com/joecks/android-architecture/blob/dev-todo-mvvm-live/todoapp/app/src/main/java/com/example/android/architecture/blueprints/todoapp/tasks/TasksFragment.java

TasksFragment.java

// Listen to Single Event live-data object that will only report a snackbar message once   
mTasksViewModel.getSnackbarMessage().observe(this, new SnackbarMessage.SnackbarObserver() {
            @Override
            public void onNewMessage(@StringRes int snackbarMessageResourceId) {
                SnackbarUtils.showSnackbar(getView(), getString(snackbarMessageResourceId));
            }
});

...
// Bind onItemClick onItemSelect to the view-model  
 ListView listView =  mTasksFragBinding.tasksList;

        mListAdapter = new TasksAdapter(
                new ArrayList<Task>(0),
                mTasksViewModel
        );
listView.setAdapter(mListAdapter);

// bind view-model directly to the view
mTasksViewModel = TasksActivity.obtainViewModel(getActivity());
mTasksFragBinding.setViewmodel(mTasksViewModel);