private RecyclerView mRecyclerView;

private MyAdapter mAdapter;

private ProgressBar mProgressBar;

private FloatingActionButton mFabButton;

private static final int ANIM_DURATION_FAB = 400;

private ExecutorService networkExecutor;

private Repository<Result<List<Book>>> booksRepository;

private SearchObservable searchObservable;

private BooksSupplier booksSupplier;

@Nullable

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragment_books, null);

mRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);

mRecyclerView.setHasFixedSize(true);

LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());

mRecyclerView.setLayoutManager(layoutManager);

mRecyclerView.addOnItemTouchListener(new RecyclerItemClickListener(getActivity(), onItemClickListener));

mRecyclerView.setItemAnimator(new DefaultItemAnimator());

mProgressBar = (ProgressBar) view.findViewById(R.id.progressBar);

mAdapter = new MyAdapter(this, getActivity());

mRecyclerView.setAdapter(mAdapter);

setUpFAB(view);

setUpRepository();

return view;

}

public class SearchObservable extends BaseObservable {

public void doSearch(String key) {

booksSupplier.setKey(key);

dispatchUpdate();

}

}

private void setUpRepository() {

searchObservable = new SearchObservable();

booksSupplier = new BooksSupplier(getString(R.string.default_search_keyword));

// Set up books repository

booksRepository = Repositories

.repositoryWithInitialValue(Result.<List<Book>>absent())

.observe(searchObservable)

.onUpdatesPerLoop()

.goTo(ThreadPool.executor)

.thenGetFrom(booksSupplier)

.compile();

}

@Override

public void onActivityCreated(@Nullable Bundle savedInstanceState) {

super.onActivityCreated(savedInstanceState);

mFabButton.setTranslationY(2 * getResources().getDimensionPixelOffset(R.dimen.btn_fab_size));

//doSearch(getString(R.string.default_search_keyword));

}

@Override

public void update() {

mProgressBar.setVisibility(View.GONE);

startFABAnimation();

if (booksRepository.get().isPresent()) {

mAdapter.updateItems(booksRepository.get().get(), true);

}

}

@Override

public void onResume() {

super.onResume();

booksRepository.addUpdatable(this);

}

@Override

public void onPause() {

super.onPause();

booksRepository.removeUpdatable(this);

}

private void doSearch(String keyword) {

mProgressBar.setVisibility(View.VISIBLE);

mAdapter.clearItems();

searchObservable.doSearch(keyword);

}

private void setUpFAB(View view) {

mFabButton = (FloatingActionButton) view.findViewById(R.id.fab_normal);

mFabButton.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View view) {

new MaterialDialog.Builder(getActivity())

.title(R.string.search)

//.inputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD)

.input(R.string.input_hint, R.string.input_prefill, new MaterialDialog.InputCallback() {

@Override

public void onInput(MaterialDialog dialog, CharSequence input) {

// Do something

if (!TextUtils.isEmpty(input)) {

doSearch(input.toString());

}

}

}).show();

}

});

}

private void startFABAnimation() {

mFabButton.animate()

.translationY(0)

.setInterpolator(new OvershootInterpolator(1.f))

.setStartDelay(500)

.setDuration(ANIM_DURATION_FAB)

.start();

}

private RecyclerItemClickListener.OnItemClickListener onItemClickListener = new RecyclerItemClickListener.OnItemClickListener() {

@Override

public void onItemClick(View view, int position) {

Book book = mAdapter.getBook(position);

Intent intent = new Intent(getActivity(), BookDetailActivity.class);

intent.putExtra("book", book);

ActivityOptionsCompat options =

ActivityOptionsCompat.makeSceneTransitionAnimation(getActivity(),

view.findViewById(R.id.ivBook), getString(R.string.transition_book_img));

ActivityCompat.startActivity(getActivity(), intent, options.toBundle());

}

};