我在实时数据的开头获取包含新项目的新列表,然后使用其数据更新适配器
viewModel.myLiveData.observe { this, Observer { myList ->
adapter.submitList(myList)
recyclerView.scrollToPosition(0)
}
submitList
它在后台线程上工作,因此总会存在延迟无法解决的竞争条件。幸运的是,我们可以使用一个RecyclerView.AdapterDataObserver
列表计算完成时通知回调:
yourRecyclerViewAdapter.registerAdapterDataObserver(object: RecyclerView.AdapterDataObserver() {
override fun onChanged() {
recycler_view_list.scrollToPosition(0)
}
override fun onItemRangeRemoved(positionStart: Int, itemCount: Int) {
recycler_view_list.scrollToPosition(0)
}
override fun onItemRangeMoved(fromPosition: Int, toPosition: Int, itemCount: Int) {
recycler_view_list.scrollToPosition(0)
}
override fun onItemRangeInserted(positionStart: Int, itemCount: Int) {
recycler_view_list.scrollToPosition(0)
}
override fun onItemRangeChanged(positionStart: Int, itemCount: Int) {
recycler_view_list.scrollToPosition(0)
}
override fun onItemRangeChanged(positionStart: Int, itemCount: Int, payload: Any?) {
recycler_view_list.scrollToPosition(0)
}
})
viewModel.myLiveData.observe { this, Observer { myList ->
adapter.submitList(myList)
}
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)