RecyclerView.Adapter.notifyItemMoved(0,1)滚动屏幕

Question

我有一个由LinearlayoutManager管理的RecyclerView,如果我将项目1与0交换然后调用mAdapter.notifyItemMoved(0,1),则移动动画会导致屏幕滚动.我该怎样预防呢？

Answer 1

可悲的是,yigit提出的解决方法滚动RecyclerView到顶部.这是我发现的最好的解决方法:

// 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);
}

Answer 2

scrollToPosition(0)移动物品后打电话.不幸的是,我假设,LinearLayoutManager尝试保持第一项稳定,这会移动,因此它会随之移动列表.