mzgreen

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

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

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

mzgreen

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

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

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

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
  super.onScrolled(recyclerView, dx, dy);
  
  int firstVisibleItem = ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstVisibleItemPosition();
  //show views if first item is first visible position and views are hidden
  if (firstVisibleItem == 0) {
    if(!controlsVisible) {
      onShow();
      controlsVisible = true;

mzgreen

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent">

    <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 PartTwoActivity extends ActionBarActivity {

    private Toolbar mToolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        setTheme(R.style.AppThemeGreen);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_part_two);

mzgreen

public abstract class HidingScrollListener extends RecyclerView.OnScrollListener {

    private int mToolbarOffset = 0;
    private int mToolbarHeight;

    public HidingScrollListener(Context context) {
        mToolbarHeight = Utils.getToolbarHeight(context);
    }

    @Override