RecyclerView.Adapter.notifyItemMoved(0,1) scrolls screen

问题

I have a RecyclerView managed by a LinearlayoutManager, if I swap item 1 with 0 and then call mAdapter.notifyItemMoved(0,1), the moving animation causes the screen to scroll. How can I prevent it?

回答1:

Call scrollToPosition(0) after moving items. Unfortunately, i assume, LinearLayoutManager tries to keep first item stable, which moves so it moves the list with it.

回答2:

Sadly the workaround presented by yigit scrolls the RecyclerView to the top. This is the best workaround I found till now:

// figure out the position of the first visible item
int firstPos = manager.findFirstCompletelyVisibleItemPosition();
int offsetTop = 0;
if(firstPos >= 0) {
    View firstView = manager.findViewByPosition(firstPos);
    offsetTop = manager.getDecoratedTop(firstView) - manager.getTopDecorationHeight(firstView);
}

// apply changes
adapter.notify...

// reapply the saved position
if(firstPos >= 0) {
    manager.scrollToPositionWithOffset(firstPos, offsetTop);
}

来源：https://stackoverflow.com/questions/27992427/recyclerview-adapter-notifyitemmoved0-1-scrolls-screen