CODEWITHSUNDEEP
android
VLeonovs
VLeonovs

Reputation: 2251

Hide/Show many views onScroll RecyclerView

I have layout like that:

enter image description here

I would like to implement that functionality: When user ScrollDown RecyclerView two things which he see are Toolbar and FilterPanel. The title and image is hidden, when he scroll up till to the beggining of the recyclerview the title and image appear.

There is my HiddingScrollListener:

public abstract class HidingScrollListener extends RecyclerView.OnScrollListener {
    private static final float HIDE_THRESHOLD = 10;
    private int scrolledDistance = 0;
    private boolean controlsVisible = true;

    public HidingScrollListener() {

    }

    @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);


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

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


    }


    public abstract void onShow();
    public abstract void onHide();

}

And my implementation of this listener in activity:

 mRecyclerView.addOnScrollListener(new HidingScrollListener() {
            @Override
            public void onShow() {
            }

            @Override
            public void onHide() {
                mTitle.setVisibility(View.GONE);
                mImageView.setVisibility(View.GONE);
            }

        });

I don't know how to catch when RecyclerView is in the beggining and how to show title and image in this case. And I have a problem: How to pin FilterPanel under the Toolbar when I scroll down?

Anyway, thank you!

Upvotes: 1

Views: 749

Answers (1)

gilgil28
gilgil28

Reputation: 540

You should use the CoordinatorLayout from the android design support library. This layout coordinates between it's children events, most commonly scroll events. Here is a tutorial: https://guides.codepath.com/android/Handling-Scrolls-with-CoordinatorLayout

Upvotes: 1

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