android - 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)，移动动画导致屏幕滚动。我该如何预防？

Answer 1

遗憾的是，yigit 提出的解决方法是将 RecyclerView 滚动到顶部。这是迄今为止我发现的最佳解决方法:

// 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);
}