How to collapse/expand a view based on scroll direction?

Question

I have a View and a RecyclerView housed in a LinearLayout. What I want to achieve is something like this:

https://material.google.com/patterns/scrolling-techniques.h

Answer 1

Try this:- I also want this kind of animation on custom view and i have achieved it this way.

public class TestActivity extends AppCompatActivity {
    private static final int HIDE_THRESHOLD = 20;
    //this is you custom layout it is any thing.
    LinearLayout customLayout;
    private int scrolledDistance = 0;
    private boolean controlsVisible = true;
    private RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.your_layout);

        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                super.onScrollStateChanged(recyclerView, newState);
            }

            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                super.onScrolled(recyclerView, dx, dy);
                scrolledDistance = dy;
                if (scrolledDistance > HIDE_THRESHOLD && controlsVisible) {
                    hideViews();
                    controlsVisible = false;
                } else if (scrolledDistance < -HIDE_THRESHOLD && !controlsVisible) {
                    showViews();
                    controlsVisible = true;
                }
            }
        });
    }

    private void hideViews() {
        customLayout.animate().translationY(-customLayout.getHeight()).setInterpolator(new AccelerateInterpolator(2));
    }

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

Edit - 1 for ScrollView try this listener

scrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
            @Override
            public void onScrollChanged() {
                if (scrolledDistance > HIDE_THRESHOLD && controlsVisible) {
                    hideViews();
                    controlsVisible = false;
                    scrolledDistance = 0;
                } else if (scrolledDistance < -HIDE_THRESHOLD && !controlsVisible) {
                    showViews();
                    controlsVisible = true;
                    scrolledDistance = 0;
                }
            }
        });

Hope it also helps you...