从RecyclerView删除项目无法正常工作

Question

I didn't customize anything on RecyclerView so there's default animation on item added/removed. While I found the animation isn't working as I expected. When I removed item by the following code:

mComments.remove(position);
notifyItemRemoved(position);

I see on UI it always remove the wrong one, and the one should be removed already keeps showing up and overlay the others.

new CountDownTimer(60000, 1000) {
    @Override
    public void onTick(long l) {
        for (int i = 0; i < mComments.size(); i++) {
            RoomMessage item = mComments.get(i);
            item.timeRemaining -= 1000;

            if (item.timeRemaining <= 0) {
                Log.v(TAG, "Going to remove no." + i + ". And the content = " + mComments.get(i).text);
                removeAt(i);
            }
        }
    }

    @Override
    public void onFinish() {
        start();
    }
}.start();

According to log, I did remove the right one. See as below.

02-16 15:26:38.274 21861-21861/com.xxxx.android V/ChatsAdapter: Going to remove no.0. And the content = 1
02-16 15:26:41.284 21861-21861/com.xxxx.android V/ChatsAdapter: Going to remove no.0. And the content = 2
02-16 15:26:42.284 21861-21861/com.xxxx.android V/ChatsAdapter: Going to remove no.0. And the content = 3

What did I do wrong?

btw I've set setisRecyclable(false)

Answer 1

Use only notifyItemRemoved(position); .You are using both. notifyItemRemoved which is for notifying that items previously located at position has been removed from the data set. While notifyItemRangeChanged(int positionStart, int itemCount) is used only when notify any registered observers that the itemCount items starting at position positionStart have changed. If you are adding single item use notifyItemInserted . If you have added more then one new items then use notifyItemRangeInserted(int positionStart, int itemCount) . Any method ending with Changed states that the value or values of that particular item or row has changed.