onLayout changed causes RecyclerView horizontal scroll to reset

问题

When the text is changed, the layout refreshed and the scrolling in the recyclerview is resets to position 0, 0.

Here is my layout:

<LinearLayout android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:orientation="vertical">
    <android.support.v7.widget.RecyclerView android:id="@+id/recyclerview1"
                                            android:layout_width="match_parent"
                                            android:layout_height="132dp"
                                            android:scrollbars="horizontal" />
    <LinearLayout android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:layout_marginTop="8dp">
        <TextView android:text="@{prod.name}"
                  android:maxEms="12"
                  style="@style/ProdGroupLabel" />
        <Button android:id="@+id/buttonedit"
                android:text="Edit"
                android:visibility="@{prod.hasOptions ? View.VISIBLE : View.INVISIBLE}"
                style="@style/ProdGroupButtonEdit"/>
    </LinearLayout>
</LinearLayout>

Now, when the product name has changed, it will appear in the text view <TextView android:text="@{prod.name}". This will force the recyclerview1 to reset its scroll position to 0,0.

Any idea on how to prevent the scrolling and preserve the original scrolling?

Thanks...

回答1:

You can make use of last visible position of layout manager you must be using before setting text

int position =  manager.findLastVisibleItemPosition();

Then u can do like this

rv.getLayoutManager().scrollToPosition(poaition)

There is also

findLastCompletelyVisibleItemPosition you can make use of.

来源：https://stackoverflow.com/questions/54274599/onlayout-changed-causes-recyclerview-horizontal-scroll-to-reset