Fast Scrolling on RecyclerView

Question

I would like to enable fling/fast scrolling on the recycler view. What I mean is that if user performs fling motion, the view continues scrolling and starts decelerating (I guess that's called fast scrolling).

I have a RecyclerView in a ScrollView

<ScrollView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/scroll"> <android.support.v7.widget.RecyclerView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/items"/> </ScrollView>

I set layout manager to Linear

 RecyclerView itemsView = findViewById(R.id.items); stocksView.setLayoutManager(new LinearLayoutManager(this));

I do have a custom adapter attached to the RecyclerView

public abstract class RecyclerAdapter<E> extends RecyclerView.Adapter<ItemView> { private ItemTouchHelper touchHelper; protected final List<E> items = new ArrayList<>(); protected RecyclerAdapter() { } @Override public void onBindViewHolder(@NonNull final ItemView holder, int position) { } @Override public void onAttachedToRecyclerView(@NonNull RecyclerView recyclerView) { super.onAttachedToRecyclerView(recyclerView); touchHelper = new ItemTouchHelper(new ItemTouchHelperCallback(this)); touchHelper.attachToRecyclerView(recyclerView); } @Override public int getItemCount() { return items.size(); } }

And my ItemTouchHelperCallback is

public class ItemTouchHelperCallback extends ItemTouchHelper.Callback { ItemTouchHelperCallback(RecyclerAdapter adapter) { } @Override public boolean isItemViewSwipeEnabled() { return true; } @Override public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN; int swipeFlags = 0; return ItemTouchHelper.Callback.makeMovementFlags(dragFlags, swipeFlags); } @Override public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder source, RecyclerView.ViewHolder target) { if (source.getItemViewType() != target.getItemViewType()) { return false; } return true; } @Override public void onSwiped(RecyclerView.ViewHolder viewHolder, int i) { } @Override public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) { // We only want the active item to change if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) { // Let the view holder know that this item is being moved or dragged ((ItemView) viewHolder).onItemSelected(); } super.onSelectedChanged(viewHolder, actionState); } @Override public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { super.clearView(recyclerView, viewHolder); // Tell the view holder it's time to restore the idle state\ ((ItemView) viewHolder).onItemClear(); } }

Yet somehow whenever I try to scroll it stops the second I lift my finger. How do I get it to continue trying to scroll.

Is there any more to the layout than what you posted? In general it doesn't make sense to put a recyclerview inside a scrollview. — Ben P.
– Ben P., Commented Aug 15, 2018 at 2:04
@BenP. The layout is in relative view. There is a button on the bottom and a toolbar up top, except that relative layout takes up rest of the space. How would you scroll recycler view without scroll view? — Quillion
– Quillion, Commented Aug 15, 2018 at 2:18
recyclerview itself a scroll view. Recyclerview scrolls itself as per the list you provided with it. No need to dd scrollview to it — Devil10
– Devil10, Commented Aug 15, 2018 at 4:18

Ben P. · Accepted Answer · 2018-08-15 02:47:08Z

Remove the ScrollView from your layout, and don't use wrap_content for the RecyclerView's height. RecyclerView already provides scrolling by itself, and you can use whatever layout_ attributes you had on the ScrollView to make the RecyclerView the right size.

orzangleli · Accepted Answer · 2018-08-15 04:01:17Z

You wrote this:

I have a RecyclerView in a ScrollView

<ScrollView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/scroll"> <android.support.v7.widget.RecyclerView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/items"/>

But RecyclerView already supports fling, remove ScrollView from xml file. And set the height of RecyclerView match_parent, like below:

 <android.support.v7.widget.RecyclerView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/items"/>

sanjay maharjan · Accepted Answer · 2018-08-15 04:57:51Z

While using scroll view you need to off nestedscroll enable.

recyclerview.setNestedScrollingEnabled(false);

Behzad Khanlar · Accepted Answer · 2018-08-15 07:21:04Z

1- Change ScrollView to NestedScrollView

2- Use app:layout_behavior="@string/appbar_scrolling_view_behavior" in both Recyclerview and NestedScrollView

<NestedScrollView android:layout_width="match_parent" android:layout_height="match_parent" app:layout_behavior="@string/appbar_scrolling_view_behavior" android:id="@+id/scroll"> <android.support.v7.widget.RecyclerView android:layout_width="match_parent" android:layout_height="wrap_content" app:layout_behavior="@string/appbar_scrolling_view_behavior" android:id="@+id/items"/>

3- Use recyclerview.setNestedScrollingEnabled(false);

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