Android recyclerview滚动到顶部 [英] Android recyclerview scroll to top

问题描述

这是我的onCreate，它处理适配器，LinearLayoutManager等等。
我尝试了每一个选项，试图将其滚动到顶部但不能。
我甚至尝试创建自己的自定义LinearLayoutManager。

This is my onCreate that handles the adapter, LinearLayoutManager and etc. I tried every single option to try to scroll it to the top but could not. I even tried to create my own custom LinearLayoutManager.

//Reson for static to call from a static method to scroll it up
private static RecyclerView taskRecyclerView;
private FirebaseAdapter firebaseAdapter;
private static LinearLayoutManager linearLayoutManager;

@Override
public View onCreateView(LayoutInflater inflater, final ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    final View view = inflater.inflate(R.layout.fragment_tasklist, container, false);



    linearLayoutManager = new LinearLayoutManager(getActivity());

    taskRecyclerView = (RecyclerView) view.findViewById(R.id.recyclerView_mainTask);
    databaseRef = FirebaseDatabase.getInstance().getReference().child(userAccount.getId());


    firebaseAdapter = new FirebaseAdapter(TaskObject.class, R.layout.one_task, TaskViewHolder.class, databaseRef.child("Task"), getContext());

    linearLayoutManager.setReverseLayout(true);
    linearLayoutManager.setStackFromEnd(true);
    linearLayoutManager.setSmoothScrollbarEnabled(true);


    taskRecyclerView.setAdapter(firebaseAdapter);
    taskRecyclerView.setLayoutManager(linearLayoutManager);
    relativeLayoutAdd.setOnClickListener(this);
    //Listen for any data change
    databaseRef.child("Task").addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            //onDataChange called so remove progress bar

            //make a call to dataSnapshot.hasChildren() and based
            //on returned value show/hide empty view

            //use helper method to add an Observer to RecyclerView

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });
    databaseRef.child("Task").keepSynced(true);
    return view;
}

推荐答案

你试过 taskRecyclerView.getLayoutManager（）。scrollToPosition（0）或 taskRecyclerView.scrollToPosition（your_position）？

RecyclerView在 taskRecyclerView.scrollToPosition（your_position）和 taskRecyclerView.getLayoutManager（）中没有实现任何滚动逻辑.rollToPosition（0） 更具体，它取决于具体的索引，取决于实现的布局，在您的情况下是线性的。

RecyclerView does not implement any scrolling logic in taskRecyclerView.scrollToPosition(your_position) and taskRecyclerView.getLayoutManager().scrollToPosition(0) is more specific and it goes to specific index depending implemented layout, in your case is linear.

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