Scroll to top in RecyclerView with LinearLayoutManager

Question

I have a fragment in which there is RecyclerView with LinearLayoutManager in which there are CardView items. There is a floating actio

Answer 1

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)

Answer 2

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.

Answer 3

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);
                }
            }
        });
    }
}

Answer 4

Using the method smoothScrollToPosition() worked for me with the newest Android version.

layoutManager.smoothScrollToPosition(mRecyclerView, null, 0);