mzgreen

private void hideViews() {
  mToolbar.animate().translationY(-mToolbar.getHeight()).setInterpolator(new AccelerateInterpolator(2));
  
  FrameLayout.LayoutParams lp = (FrameLayout.LayoutParams) mFabButton.getLayoutParams();
  int fabBottomMargin = lp.bottomMargin;
  mFabButton.animate().translationY(mFabButton.getHeight()+fabBottomMargin).setInterpolator(new AccelerateInterpolator(2)).start();
}

private void showViews() {
  mToolbar.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2));

mzgreen

private void initRecyclerView() {
  RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
  recyclerView.setLayoutManager(new LinearLayoutManager(this));
  RecyclerAdapter recyclerAdapter = new RecyclerAdapter(createItemList());
  recyclerView.setAdapter(recyclerAdapter);
  //setting up our OnScrollListener
  recyclerView.setOnScrollListener(new HidingScrollListener() {
    @Override
    public void onHide() {
      hideViews();

mzgreen

if (scrolledDistance > HIDE_THRESHOLD && controlsVisible) {
  onHide();
  controlsVisible = false;
  scrolledDistance = 0;
} else if (scrolledDistance < -HIDE_THRESHOLD && !controlsVisible) {
  onShow();
  controlsVisible = true;
  scrolledDistance = 0;
}

mzgreen

if((controlsVisible && dy>0) || (!controlsVisible && dy<0)) {
  scrolledDistance += dy;
}

mzgreen

public abstract class HidingScrollListener extends RecyclerView.OnScrollListener {
  private static final int HIDE_THRESHOLD = 20;
  private int scrolledDistance = 0;
  private boolean controlsVisible = true;
  
  @Override
  public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);
   
    if (scrolledDistance > HIDE_THRESHOLD && controlsVisible) {

mzgreen

public class RecyclerHeaderViewHolder extends RecyclerView.ViewHolder {
  public RecyclerHeaderViewHolder(View itemView) {
    super(itemView);
  }
}

mzgreen

<View xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="?attr/actionBarSize"/>

mzgreen

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
  //added view types
  private static final int TYPE_HEADER = 2;
  private static final int TYPE_ITEM = 1;
  
  private List<String> mItemList;
  
  public RecyclerAdapter(List<String> itemList) {
    mItemList = itemList;
  }

mzgreen

<android.support.v7.widget.RecyclerView
  android:id="@+id/recyclerView"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingTop="?attr/actionBarSize"
  android:clipToPadding="false"/>

mzgreen

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
  private List<String> mItemList;

  public RecyclerAdapter(List<String> itemList) {
    mItemList = itemList;
  }
  
  @Override
  public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    final View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_item, parent, false);