java Android recyclerview 滚动到顶部
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Android recyclerview scroll to top
提问by nnn
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.
这是我的 onCreate 处理适配器、LinearLayoutManager 等。我尝试了每一个选项来尝试将其滚动到顶部，但不能。我什至尝试创建自己的自定义 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;
}
回答by Florescu C?t?lin
Did you try taskRecyclerView.getLayoutManager().scrollToPosition(0)or taskRecyclerView.scrollToPosition(your_position)?
你有没有尝试taskRecyclerView.getLayoutManager().scrollToPosition(0)还是taskRecyclerView.scrollToPosition(your_position)？
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.
RecyclerView 没有实现任何滚动逻辑，taskRecyclerView.scrollToPosition(your_position)并且taskRecyclerView.getLayoutManager().scrollToPosition(0)更具体，它会根据实现的布局转到特定的索引，在您的情况下是线性的。
