I have implemented a horizontal scrollable RecyclerView
. My RecyclerView
uses a LinearLayoutManager
, and the problem I am facing is that when I try to use scrollToPosition(position)
or smoothScrollToPosition(position)
or from LinearLayoutManager
's scrollToPositionWithOffset(position)
. Neither works for me. Either a scroll call doesn't scroll to the desired location or it doesn't invoke the OnScrollListener
.
So far I have tried so many different combinations of code that I cannot post them all here. Following is the one that works for me (But only partially):
public void smoothUserScrollTo(final int position) {
if (position < 0 || position > getAdapter().getItemCount()) {
Log.e(TAG, "An attempt to scroll out of adapter size has been stopped.");
return;
}
if (getLayoutManager() == null) {
Log.e(TAG, "Cannot scroll to position a LayoutManager is not set. " +
"Call setLayoutManager with a non-null layout.");
return;
}
if (getChildAdapterPosition(getCenterView()) == position) {
return;
}
stopScroll();
scrollToPosition(position);
if (lastScrollPosition == position) {
addOnLayoutChangeListener(new OnLayoutChangeListener() {
@Override
public void onLayoutChange(View v, int left, int top, int right, int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) {
if (left == oldLeft && right == oldRight && top == oldTop && bottom == oldBottom) {
removeOnLayoutChangeListener(this);
updateViews();
// removing the following line causes a position - 3 effect.
scrollToView(getChildAt(0));
}
}
});
}
lastScrollPosition = position;
}
@Override
public void scrollToPosition(int position) {
if (position < 0 || position > getAdapter().getItemCount()) {
Log.e(TAG, "An attempt to scroll out of adapter size has been stopped.");
return;
}
if (getLayoutManager() == null) {
Log.e(TAG, "Cannot scroll to position a LayoutManager is not set. " +
"Call setLayoutManager with a non-null layout.");
return;
}
// stopScroll();
((LinearLayoutManager) getLayoutManager()).scrollToPositionWithOffset(position, 0);
// getLayoutManager().scrollToPosition(position);
}
I opted for scrollToPositionWithOffset()
because of this but the case perhaps is different as I use a LinearLayoutManager instead of GridLayoutManager. But the solution does work for me too, but as I said earlier only partially.
If anyone has found a work around I'd Appreciate it. Here's the gist to my code of custom ReyclerView
.
I had the same issue some weeks ago, and found only a really bad solution to solve it. Had to use a postDelayed
with 200-300ms.
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
yourList.scrollToPosition(position);
}
}, 200);
If you found a better solution, please let me know! Good luck!