I have already know we can set item's animation by call RecyclerView's setItemAnimator method. After that, we can call notifyItemRangeRemoved to let all the items "fly away" together with animation, here is the remove code.
int removedSize = dataCollection.size();
dataCollection.clear();
notifyItemRangeRemoved(0, removedSize);
However, my requirement is to remove item one by one and with some delay. I have try to use Timer + TimerTask + Handler classes to achieve it, however, each time I called notifyItemRemoved method, the RecyclerView will auto refill the item which have already disappear.
How can remove one item, and the blank place will not be replaced with another item directly?
Try to use notifyDataSetChanged() instead of notifyItemRangeRemoved()
Related
I Have a RecyclerView that lets the user reorder its items when long taping using ItemTouchHelper.SimpleCallback, the problem is that UX wants to hide a handle on all item views BUT the dragged one, to provide some kind of feedback when the long tap is detected and the card can be dragged.
The issue is that as soon as I try to call notifyDataSetChanged() to make the items update acordingly and hide the handle icon, the Drag functionality stops working.
I tried calling this logic inside the onMove first, and then, inside a ItemTouchListener:onLongClick to try to run this logic and update the recycler before the item gets moved but the same result, as soon as I add a call to notifyDataSetChanged() the drag functionality stops working, any workarrounds to acomplish this functionlity?
To resolve the issue: replace the notifyDataSetChanged call with 2 calls to notifyItemRangeChanged(start, end) to update all views before and after the one being dragged, leaving the dragged one untouched, then the views are updated properlly and the drag gesture is not affected.
This could probably be solved using a DiffCallback too.
So I was working with RecyclerView animations, and implemented an animation for when the items load into the List. I was wondering, if I can make an animation for when I replace the entire data set (an animation including the items joining and leaving the RecyclerView).
The correct way to remove an item from a recycler view is to remove the item from the data set and them inform the adapter that the item is removed. If you do this then the animation would happen similar to the animation that happens when you add an item.
myDataset.remove(position); // myDataset is List<MyObject>
mAdapter.notifyItemRemoved(position);//this line is important
If you are not using the second line then...
mAdapter.notifyDataSetChanged()
will be called and the animation will stop.
I have the RecyclerView, ItemTouchHelper and ItemTouchHelper.Callback instances to work together, and on swipe to left the selected item supposed to be removed (by this tutorial). The removal animation works, but only partly. First after swipe the item seems to be removed, but after that it reappers, and the list stays still the same:
Why can it happen?
Ensure these two statements
cartList.remove(position);
// notify the item removed by position
// to perform recycler view delete animations
// NOTE: don't call notifyDataSetChanged()
notifyItemRemoved(position);
are executing.
I have a RecyclerView and one item row needs to be updated like every second (SeekBar). So I call NotifyDataSetChanged once I update the data in the list. UI gets updated but the issue is that the RecyclerView scrolls so that this particular item is either at top or bottom of the screen.
I don't want RecyclerView to scroll.
// Update Data
mData.set(mData.indexOf(cardData), cardData);
// RefreshView
refreshView() {
runOnUiThread(new Runnable(){
notifyDataSetChanged();
}
);
You can update one item using notifyItemChanged(position); and u wont update all data in adapter, you will update only certain item
It's better to use the other notify methods from the RecyclerView.
For your usecase only swap out one item in your Adapter instead of all items and use notifyItemChanged(position).
This will be faster, the View won't scroll and if you ever will add an animation this will only work if you don't use notifyDataSetChanged
I got it working. I was having a card view above the recycler view.I just removed it. Now the whole screen is a recyclerView and I cannot see any auto scrolls.
I am trying to update a progressBar which is the part of one of the RecyclerView items. I know I can do it in two ways,
Method 1: By refreshing the item row by calling notifyItemChanged(position)
Method 2: By accessing the view using the method findViewByPosition() on LayoutMananger object.
But unluckily none of them are working in my case.
If I use the first one, the whole item will get repainted, the background color of the recyclerview is gray and the item is white, so the user can notice the whole item refresh.
If I try the second one, I will end up with problems while scrolling.
I want to update progress just like WhatsApp does. Thanks in advance
If I use the first one, the whole item will get repainted, the background color of the recyclerview is gray and the item is white, so the user can notice the whole item refresh.
I ran into this issue as well. To fix it you need to turn off the default item change animations. Once you turn off the item change animations your recyclerView item will update without any flashing/jumping, allowing you to use notifyItemChanged(int) without any problems.
Turn off the default item change animations like so:
((SimpleItemAnimator) myRecyclerView.getItemAnimator()).setSupportsChangeAnimations(false);