CODEWITHSUNDEEP
androidandroid-recyclerviewandroid-appbarlayoutgridlayoutmanager
user6318834
user6318834

Reputation:

How to detect when RecyclerView is scrolled to most top position

I have RecyclerView above that i have an AppBarLayout whose height is larger than 255 px. When user scrolls RecyclerView, AppBarLayout has an fling issue. To avoid that i decided to expand AppBarLayout manually. My RecyclerView made of GridLayoutManager with span of 3. I used below code to listen RecyclerView top reach

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        super.onScrollStateChanged(recyclerView, newState);
        if (newState == RecyclerView.SCROLL_STATE_IDLE) {
            int firstVisiblePosition = ((LinearLayoutManager)recyclerView.getLayoutManager()).findFirstCompletelyVisibleItemPosition();
            if (firstVisiblePosition == 0) {
                appBarLayout.setExpanded(true, true);
            }
        }
    }
});

Upvotes: 6

Views: 7860

Answers (3)

SerjantArbuz
SerjantArbuz

Reputation: 1244

I found a brilliant solution here. You could implement it inside your RecyclerView.OnScrollListener like this:

binding.recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
    override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
        super.onScrolled(recyclerView, dx, dy)

        if (!recyclerView.canScrollVertically(-1)) {
            Log.d(TAG, "THE TOP")
        } else {
            Log.d(TAG, "NOT TOP")
        }
    }
})

Upvotes: 0

Gorkem KARA
Gorkem KARA

Reputation: 191

This answer will help you. Yours truly

recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {

            super.onScrollStateChanged(recyclerView, newState);
        }

        @Override
        public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);

            totalItemCount = layoutManager.getItemCount();
            visibleItemCount = layoutManager.getChildCount();
            pastVisiblesItems = layoutManager.findFirstVisibleItemPosition();
            if ((visibleItemCount + pastVisiblesItems) >= totalItemCount ) {

                Log.d(TAG, "scroll down");



            }
            else{
                Log.d(TAG, "scroll up");
            }
        }
    });

Upvotes: 0

Hafiz Muneeb
Hafiz Muneeb

Reputation: 307

    recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);

            int firstVisibleItem = gridLayoutManager.findFirstCompletelyVisibleItemPosition();

            if(firstVisibleItem == 0){
                // your code
            }
        }
    });

Upvotes: 5

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