I have a fragment in which there is RecyclerView
with LinearLayoutManager
in which there are CardView
items. There is a floating action button on clicking which the items should scroll to top. I have tried using scrollToPosition
as well as scrollToPositionWithOffset
with RecyclerView
and also with LinearLayoutManager
as shown below. But it has no effect at all. Why is this so? Can anyone please help me out.
And i have placed the RecyclerView
directly inside the SwipeRefreshView
in the xml file. I am calling setFloatingActionButton
as soon as set adapter to RecyclerView
.
public void setFloatingActionButton(final View view) {
float = (android.support.design.widget.FloatingActionButton) getActivity().findViewById(R.id.float);
float.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mRecyclerView.smoothScrollToPosition(0);
android.support.design.widget.Snackbar.make(view, "Scrolled to Top", android.support.design.widget.Snackbar.LENGTH_SHORT)
.setAction("Ok", new View.OnClickListener() {
@Override
public void onClick(View v) {
LinearLayoutManager llm = (LinearLayoutManager) mRecyclerView.getLayoutManager();
llm.scrollToPosition(0);
}
})
.setActionTextColor(getActivity().getResources().getColor(R.color.coloLink))
.show();
}
});
}
Continuing from above comments, ideally, replacing
mRecyclerView.smoothScrollToPosition(0);
in the onClick
of the floating action button with
mLayoutManager.scrollToPositionWithOffset(0, 0);
should work. You can also remove the SnackBar
code, because you don't need it anyways. So, all in all your above method should look like
public void setFloatingActionButton(final View view) {
float actionButton = (android.support.design.widget.FloatingActionButton) getActivity()
.findViewById(R.id.float);
actionButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView
.getLayoutManager();
layoutManager.scrollToPositionWithOffset(0, 0);
}
});
}
And if you say that the above doesnt work, then test if the onClick()
is even being called or not. Try adding a log message in it and see if its printed.
使用方法smoothScrollToPosition()
在最新的 Android 版本中为我工作。
layoutManager.smoothScrollToPosition(mRecyclerView, null, 0);
Call 'scrollToPosition(0)' using this:
public void scrollToPosition(final int position) {
if (mRecyclerView != null) {
getHandler().post(new Runnable() {
@Override
public void run() {
mRecyclerView.scrollToPosition(position);
if (position == 0) {
LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager();
layoutManager.scrollToPositionWithOffset(0, 0);
mScrollView.fullScroll(View.FOCUS_UP);
}
}
});
}
}
In my case, the requirement was to populate the view in reverse order, which made the layout show the bottom view of the scroll view
layoutManager.smoothScrollToPosition(mRecyclerView, null, 'last_index')
didn't really help.
My problem was resolved when I made the recycler view to show the child at the last position
recyclerView.scrollToPosition(length-1)
In Kotlin
// Scroll to the top of the list
GlobalScope.launch(Dispatchers.Main) {
delay(200)
if (binding.rateList.size > 1) {
//binding.recyclerView.smoothScrollToPosition(0)
binding.recyclerView.layoutManager?.scrollToPosition(0)
}
The above solutions didn't work for me coz my recycler view was inside the NestedScrollView. So this solution worked for me.
nestedScroll.smoothScrollTo(0,recycler.top)
如果您不想平滑滚动,这将适用于任何LayoutManager
:
myRecyclerView.getLayoutManager().scrollToPosition(0);
Some time user uses NestedScrollView for the NestedScrollView we can use below code.
/*Scrolls NestedScrollView to the top of screen.*/
viewBinding.scrollview.fullScroll(View.FOCUS_UP)
May be it can help to somebody in future.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.