I'm trying to programmatically scroll to a particular item within my RecyclerView which is nested within a NestedScrollView.
The Problem
The NestedScrollView scrolls to the complete bottom rather than the desired item.
Note: It works correctly when desired item is the 2nd item, probably since that item is visible in the screen.
What I've tried
I've searched through a dozen solutions from StackOverFlow and came up with the function below.
I've tried:
binding.variantsRecyclerView.getChildAt()binding.variantsRecyclerView.findViewWithTag()binding.variantsRecyclerView.findViewHolderForAdapterPosition()
All these do return the correct item, (I know since the edit text within that item is focused as coded) however, the NestedScrollView does not scroll correctly to that item. It is almost always scrolling to the bottom. Sometimes however it scrolls to somewhere in between the required item instead of it's start. The only time this works is when the item is either the 1st or 2nd item. (As stated before)
private fun scrollToPosition(position: Int) { if (position in 0 until variantsAdapter.itemCount) { val view = binding.variantsRecyclerView.findViewWithTag<ConstraintLayout>("pos_$position") if (view != null) { val height = binding.nestedScrollView.height val target = view.y.toInt() binding.nestedScrollView.postDelayed({ binding.nestedScrollView.smoothScrollTo(0, target) view.requestFocus() }, 200) } } } My XML
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#eff1f4"> <LinearLayout>...</LinearLayout> <androidx.core.widget.NestedScrollView android:id="@+id/nestedScrollView" android:layout_width="match_parent" android:layout_height="0dp" android:fillViewport="true" app:layout_constrainedHeight="true" app:layout_constraintVertical_bias="0" app:layout_constraintBottom_toTopOf="@+id/btnNextLayout" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@id/toolbarLayout"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginStart="@dimen/ui_10_dp" android:layout_marginEnd="@dimen/ui_10_dp" android:orientation="vertical"> <androidx.recyclerview.widget.RecyclerView android:id="@+id/variantsRecyclerView" android:layout_width="match_parent" android:layout_height="wrap_content" android:clipToPadding="false" android:nestedScrollingEnabled="false" android:paddingTop="12dp" android:paddingBottom="12dp" app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" tools:itemCount="2" tools:listitem="@layout/sell_variant_row_item" /> <androidx.constraintlayout.widget.ConstraintLayout> ... </androidx.constraintlayout.widget.ConstraintLayout> </LinearLayout> </androidx.core.widget.NestedScrollView> <LinearLayout>...</LinearLayout> </androidx.constraintlayout.widget.ConstraintLayout> My Understanding
After debugging, I found out that the NestedScrollView height is lesser than the y co-ordinate of the desired item. Hence it scrolls to the bottom of the view instead of the desired item. My understanding could be completely wrong and if so, please correct me.
